Hot rolled products of structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition

Part 6 of this document, in addition to part 1, specifies requirements for flat products of high yield strength alloy special steels. The grades and qualities are given in Tables 2 to 4 (chemical composition) and Tables 5 to 7 (mechanical properties) and are supplied in the quenched and tempered condition as given in 6.3.
The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal thickness of 3 mm and a maximum nominal thickness < 150 mm for grades S460, S500, S550, S620 and S690, a maximum nominal thickness < 100 mm for grade S890 and a maximum nominal thickness < 50 mm for grade S960, in steels which, after quenching and tempering, have a specified minimum yield strength of 460 MPa to 960 MPa.

Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten Zustand

Dieses Dokument legt die technischen Lieferbedingungen für Flacherzeugnisse aus legierten Edelstählen mit höherer Streckgrenze fest. Die Sorten und Gütegruppen sind in den Tabellen 1 bis 3 (chemische Zusammensetzung) sowie 4 bis 6 (mechanische Eigenschaften) aufgeführt und sie werden im vergüteten Zustand geliefert.
Die Stähle nach diesem Dokument sind anwendbar für warmgewalzte Flacherzeugnisse mit einer Mindestnenndicke von 3 mm und einer Höchstnenndicke von 200 mm für die Sorten S460, S500, S550, S620 und S690 sowie einer Höchstnenndicke von 125 mm für die Sorten S890 und S960, die nach dem Vergüten festgelegte Mindestwerte der Streckgrenze im Bereich von 460 MPa bis 960 MPa aufweisen.

Produits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenu

Le présent document spécifie les conditions techniques de livraison pour les produits plats en aciers alliés spéciaux à haute limite d'élasticité. Les nuances et qualités sont données dans les Tableaux 1 à 3 (composition chimique) et 4 à 6 (caractéristiques mécaniques) et sont livrées à l'état trempé et revenu.
Les aciers spécifiés dans le présent document sont applicables aux produit plats laminés à chaud ayant une épaisseur nominale minimale de 3 mm et une épaisseur nominale maximale de 200 mm pour les nuances S460, S500, S550, S620 et S690 et une épaisseur nominale maximale de 125 mm pour les nuances S890 et S960, dans les aciers qui, après trempe et revenu, ont une limite d’élasticité minimale spécifiée comprise entre 460 MPa et 960 MPa.

Vroče valjani izdelki iz konstrukcijskih jekel - 6. del: Tehnični dobavni pogoji za ploščate izdelke iz konstrukcijskih jekel z visoko mejo plastičnosti v poboljšanem stanju jekla

6. del tega dokumenta poleg 1. dela določa zahteve za ploščate izdelke konstrukcijskih jekel z veliko plastično trdnostjo. Razredi in kakovosti so podani v tabelah od 2 do 4 (kemična sestava) ter tabelah od 5 do 7 (mehanske lastnosti); jekla so dobavljena v kaljenem in poboljšanem stanju, kot je navedeno v točki 6.3.
Jekla iz tega dokumenta veljajo za toplo valjane ploščate izdelke z najmanjšo nazivno debelino 3 mm in največjo nazivno debelino < 150 mm za razrede S460, S500, S550, S620 in S690, največjo nazivno debelino < 100 mm za razred S890 in največjo nazivno debelino < 50 mm za razred S960 pri jeklih, ki imajo po kaljenju in poboljšanju minimalno trdnost med 460 MPa in 960 MPa.

General Information

Status
Published
Public Enquiry End Date
05-Sep-2018
Publication Date
08-Sep-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Aug-2019
Due Date
01-Nov-2019
Completion Date
09-Sep-2019

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SLOVENSKI STANDARD
SIST EN 10025-6:2019
01-november-2019
Nadomešča:
SIST EN 10025-6:2005+A1:2009

Vroče valjani izdelki iz konstrukcijskih jekel - 6. del: Tehnični dobavni pogoji za

ploščate izdelke iz konstrukcijskih jekel z visoko mejo plastičnosti v poboljšanem

stanju jekla

Hot rolled products of structural steels - Part 6: Technical delivery conditions for flat

products of high yield strength structural steels in the quenched and tempered condition

Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für

Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten Zustand

Produits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de

livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenu

Ta slovenski standard je istoveten z: EN 10025-6:2019
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
SIST EN 10025-6:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 10025-6:2019
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SIST EN 10025-6:2019
EN 10025-6
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.50 Supersedes EN 10025-6:2004+A1:2009
English Version
Hot rolled products of structural steels - Part 6: Technical
delivery conditions for flat products of high yield strength
structural steels in the quenched and tempered condition

Produits laminés à chaud en aciers de construction - Warmgewalzte Erzeugnisse aus Baustählen - Teil 6:

Partie 6 : Conditions techniques de livraison pour Technische Lieferbedingungen für Flacherzeugnisse

produits plats des aciers à haute limite d'élesticité à aus Stählen mit höherer Streckgrenze im vergüteten

l'état trempé et revenu Zustand
This European Standard was approved by CEN on 16 June 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10025-6:2019 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 Classification and designation .................................................................................................................... 7

4.1 Classification ..................................................................................................................................................... 7

4.1.1 Main quality classes ....................................................................................................................................... 7

4.1.2 Grades and qualities ...................................................................................................................................... 8

4.2 Designation........................................................................................................................................................ 8

5 Information to be supplied by the purchaser ....................................................................................... 8

5.1 Mandatory information ................................................................................................................................ 8

5.2 Options ................................................................................................................................................................ 9

6 Manufacturing process .................................................................................................................................. 9

6.1 Steel making process ..................................................................................................................................... 9

6.2 Deoxidation and grain structure ............................................................................................................... 9

6.3 Delivery conditions ........................................................................................................................................ 9

7 Requirements ................................................................................................................................................... 9

7.1 General ................................................................................................................................................................ 9

7.2 Chemical composition ................................................................................................................................... 9

7.3 Mechanical properties ................................................................................................................................ 10

7.3.1 General ............................................................................................................................................................. 10

7.3.2 Impact properties ........................................................................................................................................ 10

7.4 Technological properties .......................................................................................................................... 11

7.5 Surface properties ....................................................................................................................................... 12

7.6 Internal soundness ...................................................................................................................................... 12

7.7 Tolerances on dimensions and shape, mass ...................................................................................... 12

8 Inspection ....................................................................................................................................................... 13

8.1 Type of inspection and inspection document .................................................................................... 13

8.2 Content of inspection document ............................................................................................................. 13

8.3 Tests to be carried out ................................................................................................................................ 13

9 Frequency of testing and preparation of samples and test pieces ............................................. 14

9.1 Frequency of testing .................................................................................................................................... 14

9.1.1 Chemical analysis ......................................................................................................................................... 14

9.1.2 Mechanical tests ........................................................................................................................................... 14

9.2 Preparation of samples and test pieces ............................................................................................... 14

9.2.1 Selection and preparation of samples for chemical analysis ....................................................... 14

9.2.2 Location of samples and orientation of test pieces for mechanical tests ................................ 14

9.2.3 Preparation of test pieces for mechanical tests ................................................................................ 14

9.3 Identification of samples and test pieces ............................................................................................ 15

10 Test methods ................................................................................................................................................. 15

10.1 Chemical analysis ......................................................................................................................................... 15

10.2 Mechanical tests ........................................................................................................................................... 15

10.2.1 Tensile test ..................................................................................................................................................... 15

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SIST EN 10025-6:2019
EN 10025-6:2019 (E)

10.2.2 Impact test ....................................................................................................................................................... 16

10.3 Ultrasonic testing .......................................................................................................................................... 16

10.4 Retests .............................................................................................................................................................. 16

11 Marking, labelling, packaging .................................................................................................................. 16

12 Complaints ...................................................................................................................................................... 17

13 Options ............................................................................................................................................................. 17

Annex A (normative) Location of samples and test pieces ........................................................................... 23

Annex B (informative) Minimum recommended inside bend radii for flanging .................................. 24

Annex C (informative) List of Options of EN 10025-2 to −6 .......................................................................... 25

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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
European foreword

This document (EN 10025-6:2019) has been prepared by Technical Committee CEN/TC 459/SC 3

“Structural steels other than reinforcements”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by February 2020 and conflicting national standards shall

be withdrawn at the latest by February 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 10025-6:2004+A1:2009.

This document consists of the following parts, under the general title Hot rolled products of structural

steels:
— Part 1: General technical delivery conditions
— Part 2: Technical delivery conditions for non-alloy structural steels

— Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural

steels

— Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels

— Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion

resistance

— Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the

quenched and tempered condition

For a short transition period there will be a coexistence of EN 10025-1:2004 with EN 10025-2:2019to

EN 10025−6:2019, since the new EN 10025-1 has to fulfil the requirements of the CPR and will

therefore be published later. For this short transition period up-to-the publication of the next edition of

part 1 the following is to be taken into account for EN 10025-1:2004:

a) all dated and undated references to EN 10025-1:2004 to EN 10025-6:2004 are unchanged to this

version with following exception: In 9.2.2.1 the references are 8.3.1 and 8.3.2 instead of 8.4.1 and

8.4.2;
b) Clauses 5, 12 and 13 of EN 10025-1:2004 are no longer relevant.
The main changes with respect to the previous edition are listed below:

a) part 6 is now a stand-alone standard for technical delivery conditions including the preparation of

samples and test pieces, the test methods, the marking, labelling and packaging and the drawings;

b) for applications under the CPR this document and part 1 are used together;
c) requirements for elements not definded were added to 7.2.1 and 7.2.2;

d) Option 33 was added, Option 3 was renumbered to Option 24 and Option 9 was deleted;

e) Si-content in 7.2.4 was changed;
f) 7.4.3 concerning hot-dip zinc coating was modified;
---------------------- Page: 6 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)
g) in Tables 3 and 4 the values were extended for thicknesses up to 200 mm;
h) references were updated and document editorial revised.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Republic of North Macedonia, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,

Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

the United Kingdom.
---------------------- Page: 7 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)
1 Scope

This document specifies technical delivery conditions for flat products of high yield strength alloy

special steels. The grades and qualities are given in Tables 1 to 3 (chemical composition) and Tables 4

to 6 (mechanical properties) and are supplied in the quenched and tempered condition.

The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal

thickness of 3 mm and a maximum nominal thickness of 200 mm for grades S460, S500, S550, S620 and

S690, a maximum nominal thickness of 125 mm for grades S890 and S960, in steels which, after

quenching and tempering, have a specified minimum yield strength of 460 MPa to 960 MPa.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of

ferritic steels
EN 10020:2000, Definition and classification of grades of steel
EN 10021, General technical delivery conditions for steel products

EN 10025-1, Hot rolled products of structural steels — Part 1: General technical delivery conditions

EN 10027-1, Designation systems for steels — Part 1: Steel names
EN 10027-2, Designation systems for steels — Part 2: Numerical system

EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape

EN 10048, Hot rolled narrow steel strip — Tolerances on dimensions and shape

EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels

— Tolerances on dimensions and shape
EN 10079, Definition of steel products

EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection

method)

EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections

— Part 1: General requirements

EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections

— Part 2: Plate and wide flats

EN 10164, Steel products with improved deformation properties perpendicular to the surface of the

product — Technical delivery conditions

EN 10168, Steel products — Inspection documents — List of information and description

EN 10204, Metallic products — Types of inspection documents
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SIST EN 10025-6:2019
EN 10025-6:2019 (E)

EN 10315, Routine method for analysis of high alloy steel by X-ray Fluorescence Spectrometry (XRF) by

using a near by technique

CR 10320, Optical emission analysis of low alloy steels (routine method) — Method for determination of C,

Si, S, P, Mn, Cr, Ni and Cu

EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)

EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for

mechanical testing (ISO 377)

EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels

(ISO 2566-1)

EN ISO 6892-1:2016, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

(ISO 6892-1:2016)

EN ISO 14713-2:2009, Zinc coatings — Guidelines and recommendations for the protection against

corrosion of iron and steel in structures — Part 2: Hot dip galvanizing (ISO 14713-2:2009)

EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition (ISO 14284)

EN ISO 15350, Steel and iron — Determination of total carbon and sulfur content – Infrared absorption

method after combustion in an induction furnace (routine method) (ISO 15350)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 10079 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
quenching

operation which consists of cooling a ferrous product more rapidly than in still air

3.2
tempering

heat treatment applied to a ferrous product generally after quench hardening or other heat treatment

to bring the properties to the required level

Note 1 to entry: Tempering consists of heating to specific temperatures ( followed by cooling at an appropriate rate.
4 Classification and designation
4.1 Classification
4.1.1 Main quality classes

The steel grades specified in this document shall be classified as alloy special steels according to

EN 10020.
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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
4.1.2 Grades and qualities

This document specifies seven steel grades. They differ in their minimum yield strength at room

temperature.

All steel grades may be supplied in the following qualities as specified at the time of the order:

— with specified minimum values of impact energy at temperatures not lower than −20 °C, designated

as Q;

— with specified minimum values of impact energy at temperatures not lower than −40 °C, designated

as QL;

— with specified minimum values of impact energy at temperatures not lower than −60 °C, designated

as QL1.
4.2 Designation

4.2.1 For the steel grades covered by this document the steel names shall be allocated in accordance

with EN 10027-1; the steel numbers shall be allocated in accordance with EN 10027-2.

4.2.2 The designation shall consist of:
— the number of this document (EN 10025-6);
— the steel name or the steel number; the steel name consisting of:
— the symbol S (for structural steel);

— the indication of the minimum specified yield strength for thickness ≤ 50 mm expressed in

MPa;
— the delivery condition Q;

— the capital letter L or L1 for the quality with specified minimum values of impact energy at

temperatures not lower than −40 °C or −60 °C.

EXAMPLE Structural steel (S) quenched and tempered (Q), with a specified minimum yield strength at room

temperature of 460 MPa and with a specified minimum of impact energy at −40 °C (L):

EN 10025-6 – S460QL
EN 10025-6 - 1.8906
5 Information to be supplied by the purchaser
5.1 Mandatory information

The following information shall be supplied by the purchaser at the time of the order:

a) quantity to be delivered;

b) product form and the number of the standard for dimensions and tolerances (see 2.2);

c) nominal dimensions and tolerances on dimensions and shape (see 7.7.1);
d) steel designation (see 4.2.2);

e) additional requirements of inspection and testing and all required options (see 5.2 and Clause 13);

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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
f) type of inspection document according to EN 10204 (see 8.1).
5.2 Options

A number of options are specified in Clause 13. In the event that the purchaser does not indicate his

wish to implement any of these options, the supplier shall supply in accordance with the basic

specification, see 5.1 a) to d) and f).
6 Manufacturing process
6.1 Steel making process

The steel making process is at the discretion of the manufacturer with the exclusion of the open hearth

(Siemens-Martin) process.
See Option 1, Clause 13 (details of manufacturing process).
6.2 Deoxidation and grain structure
Steels of EN 10025-6 shall:
— be fully killed;
— have a fine grain structure;

— contain nitrogen binding elements in amounts sufficient to bind the available nitrogen (for example

min. 0,020 % total aluminium). The usual guideline is a minimum aluminium to nitrogen ratio of

2:1, when no other nitrogen binding elements are present. Such other elements and their content

(% mass) shall be reported in the inspection document (see Table 1).
6.3 Delivery conditions

The products shall be supplied in the quenched and tempered condition (Q) as defined in Clause 3.

NOTE Direct quenching after hot-rolling followed by tempering is considered equivalent to conventional

quenching and tempering.
7 Requirements
7.1 General

The requirements in 7.2 and 7.3 apply for sampling, preparation of test pieces and testing specified in

Clauses 9 and 10.
7.2 Chemical composition

7.2.1 The chemical composition determined by heat analysis shall comply with the specified values of

Table 1.

For elements not defined in the table for the chemical composition for heat analysis, limit values of

Table 1 of EN 10020:2000 shall apply as maximum values.

7.2.2 The upper limits applicable for the product analysis are given in Table 2. The product analysis

shall be carried out when specified at the time of the order.
See Option 2, Clause 13 (product analysis).
---------------------- Page: 11 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)

For elements not defined in the table for the chemical composition for product analysis, limit values of

Table 1 of EN 10020:2000 shall apply as maximum values.

7.2.3 The maximum carbon equivalent values based on the heat analysis, given in Table 3 shall apply.

For determining the carbon equivalent value the following IIW (International Institute of Welding)

formula shall be used:
Cr++Mo V Ni+ Cu
CEV=C++ +
6 5 15

7.2.4 When products are supplied with a control on Si e.g. for hot-dip zinc-coating so that there could

be a need to increase the content of other elements like C and Mn to achieve the required tensile

properties, the maximum carbon equivalent values of Table 3 shall be increased as follows:

— for Si ≤ 0,04 %, increase the value of the CEV by 0,02;
— for Si ≤ 0,25 %, increase the value of the CEV by 0,01.
7.3 Mechanical properties
7.3.1 General

7.3.1.1 Under the inspection and testing conditions as specified in Clauses 8, 9 and 10 and in the

delivery condition as specified in 6.3 the mechanical properties shall comply with the values given in

Tables 4, 5 and 6.

The maximum stress-relief temperature should be at least 30 °C below the tempering temperature and

not be held for more than 1 h. As this temperature is normally not known in advance it is recommended

that the purchaser if he intends to perform a stress relief treatment to contact the steel producer. If the

purchaser intends to stress relief the products at higher temperatures or for longer times than

mentioned above the minimum values of the mechanical properties after such a treatment should be

agreed upon at the time of the order.

7.3.1.2 For the products specified in this document the nominal thickness applies.

7.3.2 Impact properties

7.3.2.1 The verification of the impact energy value shall be carried out, unless otherwise agreed

upon (see 7.3.2.2 and 7.3.2.3) with longitudinal test pieces for:
— quality Q at −20 °C;
— quality QL at −40 °C;
— quality QL1 at −60 °C.

7.3.2.2 Another temperature (given in Tables 5 and 6) may be agreed upon at the time of the order.

See Option 24, Clause 13 (Agreement on another impact test temperature).

7.3.2.3 If agreed upon at the time of the order the impact properties shall be verified on transverse

V-notch test pieces instead of longitudinal test pieces with minimum values as given in Table 6.

See Option 30, Clause 13 (Impact properties verified on transverse test pieces).
---------------------- Page: 12 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)

7.3.2.4 If specified at the time of the order on each heat treatment unit the impact properties only

or the impact properties and the tensile properties shall be verified.

See Option 13, Clause 13 (For each heat treatment unit impact properties only to be verified).

See Option 14, Clause 13 (For each heat treatment unit impact and tensile properties to be verified).

7.3.3 Improved deformation properties perpendicular to the surface

If agreed upon at the time of the order the products shall comply with one of the requirements of

EN 10164.
See Option 4, Clause 13 (Deformation properties perpendicular to the surface).
7.4 Technological properties
7.4.1 Weldability

The steels specified in this document do not have unlimited suitability for the various welding

processes, since the behaviour of a steel during and after welding depends not only on the material but

also on the dimensions and shape and on the manufacturing and service conditions of the components.

General requirements for arc welding of the steels specified in this document shall be as given in

EN 1011-2.

NOTE With increasing product thickness and strength level cold cracking can occur. Cold cracking is caused

by the following factors in combination:
— the amount of diffusible hydrogen in the weld metal;
— a brittle structure of the heat affected zone;
— significant tensile stress concentrations in the welded joint.
7.4.2 Formability and flame straightening
7.4.2.1 General

Recommendations regarding hot forming, cold forming and flame-straightening are laid out in

CEN/TR 10347.
7.4.2.2 Hot-forming

Hot forming is not recommended for quenched and tempered steels as the necessary heat treatment

after hot forming is very difficult to reproduce.
7.4.2.3 Cold formability
7.4.2.3.1 General

NOTE Cold forming leads to reduction in the ductility. Furthermore it is important to draw the attention to

the risk of brittle fracture in connection with hot-dip zinc coating.
---------------------- Page: 13 ----------------------
SIST EN 10025-6:2019
EN 10025-6:2019 (E)
7.4.2.3.2 Flangeability

If specified at the time of the order plates and wide flats with a nominal thickness ≤ 16 mm are suitable

for flanging without cracking with the indicative values for the inside minimum bend radii for cold

forming as given in Annex B.
See Option 11, Clause 13 (Flangeability without cracking).
7.4.3 Hot-dip zinc-coating

EN ISO 1461 should be used to specify coating requirements. EN ISO 14713-2 provides further

guidance, including information on the influence of various factors, including steel chemical

composition, on the coating formation.

Option 5, Clause 13 can be used to order steels with a chemical composition required for hot-dip zinc

coating. When option 5 is implemented, the purchaser and manufacturer shall a
...

SLOVENSKI STANDARD
SIST EN 10025-6:2019
01-november-2019
Nadomešča:
SIST EN 10025-6:2005+A1:2009

Vroče valjani izdelki iz konstrukcijskih jekel - 6. del: Tehnični dobavni pogoji za

ploščate izdelke iz konstrukcijskih jekel z veliko plastično trdnostjo v kaljenem in

popuščenem stanju

Hot rolled products of structural steels - Part 6: Technical delivery conditions for flat

products of high yield strength structural steels in the quenched and tempered condition

Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für

Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten Zustand

Produits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de

livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenu

Ta slovenski standard je istoveten z: EN 10025-6:2019
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
SIST EN 10025-6:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 10025-6:2019
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SIST EN 10025-6:2019
EN 10025-6
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.50 Supersedes EN 10025-6:2004+A1:2009
English Version
Hot rolled products of structural steels - Part 6: Technical
delivery conditions for flat products of high yield strength
structural steels in the quenched and tempered condition

Produits laminés à chaud en aciers de construction - Warmgewalzte Erzeugnisse aus Baustählen - Teil 6:

Partie 6 : Conditions techniques de livraison pour Technische Lieferbedingungen für Flacherzeugnisse

produits plats des aciers à haute limite d'élesticité à aus Stählen mit höherer Streckgrenze im vergüteten

l'état trempé et revenu Zustand
This European Standard was approved by CEN on 16 June 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10025-6:2019 E

worldwide for CEN national Members.
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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 Classification and designation .................................................................................................................... 7

4.1 Classification ..................................................................................................................................................... 7

4.1.1 Main quality classes ....................................................................................................................................... 7

4.1.2 Grades and qualities ...................................................................................................................................... 8

4.2 Designation........................................................................................................................................................ 8

5 Information to be supplied by the purchaser ....................................................................................... 8

5.1 Mandatory information ................................................................................................................................ 8

5.2 Options ................................................................................................................................................................ 9

6 Manufacturing process .................................................................................................................................. 9

6.1 Steel making process ..................................................................................................................................... 9

6.2 Deoxidation and grain structure ............................................................................................................... 9

6.3 Delivery conditions ........................................................................................................................................ 9

7 Requirements ................................................................................................................................................... 9

7.1 General ................................................................................................................................................................ 9

7.2 Chemical composition ................................................................................................................................... 9

7.3 Mechanical properties ................................................................................................................................ 10

7.3.1 General ............................................................................................................................................................. 10

7.3.2 Impact properties ........................................................................................................................................ 10

7.4 Technological properties .......................................................................................................................... 11

7.5 Surface properties ....................................................................................................................................... 12

7.6 Internal soundness ...................................................................................................................................... 12

7.7 Tolerances on dimensions and shape, mass ...................................................................................... 12

8 Inspection ....................................................................................................................................................... 13

8.1 Type of inspection and inspection document .................................................................................... 13

8.2 Content of inspection document ............................................................................................................. 13

8.3 Tests to be carried out ................................................................................................................................ 13

9 Frequency of testing and preparation of samples and test pieces ............................................. 14

9.1 Frequency of testing .................................................................................................................................... 14

9.1.1 Chemical analysis ......................................................................................................................................... 14

9.1.2 Mechanical tests ........................................................................................................................................... 14

9.2 Preparation of samples and test pieces ............................................................................................... 14

9.2.1 Selection and preparation of samples for chemical analysis ....................................................... 14

9.2.2 Location of samples and orientation of test pieces for mechanical tests ................................ 14

9.2.3 Preparation of test pieces for mechanical tests ................................................................................ 14

9.3 Identification of samples and test pieces ............................................................................................ 15

10 Test methods ................................................................................................................................................. 15

10.1 Chemical analysis ......................................................................................................................................... 15

10.2 Mechanical tests ........................................................................................................................................... 15

10.2.1 Tensile test ..................................................................................................................................................... 15

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10.2.2 Impact test ....................................................................................................................................................... 16

10.3 Ultrasonic testing .......................................................................................................................................... 16

10.4 Retests .............................................................................................................................................................. 16

11 Marking, labelling, packaging .................................................................................................................. 16

12 Complaints ...................................................................................................................................................... 17

13 Options ............................................................................................................................................................. 17

Annex A (normative) Location of samples and test pieces ........................................................................... 23

Annex B (informative) Minimum recommended inside bend radii for flanging .................................. 24

Annex C (informative) List of Options of EN 10025-2 to −6 .......................................................................... 25

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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
European foreword

This document (EN 10025-6:2019) has been prepared by Technical Committee CEN/TC 459/SC 3

“Structural steels other than reinforcements”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by February 2020 and conflicting national standards shall

be withdrawn at the latest by February 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 10025-6:2004+A1:2009.

This document consists of the following parts, under the general title Hot rolled products of structural

steels:
— Part 1: General technical delivery conditions
— Part 2: Technical delivery conditions for non-alloy structural steels

— Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural

steels

— Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels

— Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion

resistance

— Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the

quenched and tempered condition

For a short transition period there will be a coexistence of EN 10025-1:2004 with EN 10025-2:2019to

EN 10025−6:2019, since the new EN 10025-1 has to fulfil the requirements of the CPR and will

therefore be published later. For this short transition period up-to-the publication of the next edition of

part 1 the following is to be taken into account for EN 10025-1:2004:

a) all dated and undated references to EN 10025-1:2004 to EN 10025-6:2004 are unchanged to this

version with following exception: In 9.2.2.1 the references are 8.3.1 and 8.3.2 instead of 8.4.1 and

8.4.2;
b) Clauses 5, 12 and 13 of EN 10025-1:2004 are no longer relevant.
The main changes with respect to the previous edition are listed below:

a) part 6 is now a stand-alone standard for technical delivery conditions including the preparation of

samples and test pieces, the test methods, the marking, labelling and packaging and the drawings;

b) for applications under the CPR this document and part 1 are used together;
c) requirements for elements not definded were added to 7.2.1 and 7.2.2;

d) Option 33 was added, Option 3 was renumbered to Option 24 and Option 9 was deleted;

e) Si-content in 7.2.4 was changed;
f) 7.4.3 concerning hot-dip zinc coating was modified;
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g) in Tables 3 and 4 the values were extended for thicknesses up to 200 mm;
h) references were updated and document editorial revised.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Republic of North Macedonia, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,

Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

the United Kingdom.
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SIST EN 10025-6:2019
EN 10025-6:2019 (E)
1 Scope

This document specifies technical delivery conditions for flat products of high yield strength alloy

special steels. The grades and qualities are given in Tables 1 to 3 (chemical composition) and Tables 4

to 6 (mechanical properties) and are supplied in the quenched and tempered condition.

The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal

thickness of 3 mm and a maximum nominal thickness of 200 mm for grades S460, S500, S550, S620 and

S690, a maximum nominal thickness of 125 mm for grades S890 and S960, in steels which, after

quenching and tempering, have a specified minimum yield strength of 460 MPa to 960 MPa.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of

ferritic steels
EN 10020:2000, Definition and classification of grades of steel
EN 10021, General technical delivery conditions for steel products

EN 10025-1, Hot rolled products of structural steels — Part 1: General technical delivery conditions

EN 10027-1, Designation systems for steels — Part 1: Steel names
EN 10027-2, Designation systems for steels — Part 2: Numerical system

EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape

EN 10048, Hot rolled narrow steel strip — Tolerances on dimensions and shape

EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels

— Tolerances on dimensions and shape
EN 10079, Definition of steel products

EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection

method)

EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections

— Part 1: General requirements

EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections

— Part 2: Plate and wide flats

EN 10164, Steel products with improved deformation properties perpendicular to the surface of the

product — Technical delivery conditions

EN 10168, Steel products — Inspection documents — List of information and description

EN 10204, Metallic products — Types of inspection documents
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EN 10025-6:2019 (E)

EN 10315, Routine method for analysis of high alloy steel by X-ray Fluorescence Spectrometry (XRF) by

using a near by technique

CR 10320, Optical emission analysis of low alloy steels (routine method) — Method for determination of C,

Si, S, P, Mn, Cr, Ni and Cu

EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)

EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for

mechanical testing (ISO 377)

EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels

(ISO 2566-1)

EN ISO 6892-1:2016, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

(ISO 6892-1:2016)

EN ISO 14713-2:2009, Zinc coatings — Guidelines and recommendations for the protection against

corrosion of iron and steel in structures — Part 2: Hot dip galvanizing (ISO 14713-2:2009)

EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition (ISO 14284)

EN ISO 15350, Steel and iron — Determination of total carbon and sulfur content – Infrared absorption

method after combustion in an induction furnace (routine method) (ISO 15350)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 10079 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
quenching

operation which consists of cooling a ferrous product more rapidly than in still air

3.2
tempering

heat treatment applied to a ferrous product generally after quench hardening or other heat treatment

to bring the properties to the required level

Note 1 to entry: Tempering consists of heating to specific temperatures ( followed by cooling at an appropriate rate.
4 Classification and designation
4.1 Classification
4.1.1 Main quality classes

The steel grades specified in this document shall be classified as alloy special steels according to

EN 10020.
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4.1.2 Grades and qualities

This document specifies seven steel grades. They differ in their minimum yield strength at room

temperature.

All steel grades may be supplied in the following qualities as specified at the time of the order:

— with specified minimum values of impact energy at temperatures not lower than −20 °C, designated

as Q;

— with specified minimum values of impact energy at temperatures not lower than −40 °C, designated

as QL;

— with specified minimum values of impact energy at temperatures not lower than −60 °C, designated

as QL1.
4.2 Designation

4.2.1 For the steel grades covered by this document the steel names shall be allocated in accordance

with EN 10027-1; the steel numbers shall be allocated in accordance with EN 10027-2.

4.2.2 The designation shall consist of:
— the number of this document (EN 10025-6);
— the steel name or the steel number; the steel name consisting of:
— the symbol S (for structural steel);

— the indication of the minimum specified yield strength for thickness ≤ 50 mm expressed in

MPa;
— the delivery condition Q;

— the capital letter L or L1 for the quality with specified minimum values of impact energy at

temperatures not lower than −40 °C or −60 °C.

EXAMPLE Structural steel (S) quenched and tempered (Q), with a specified minimum yield strength at room

temperature of 460 MPa and with a specified minimum of impact energy at −40 °C (L):

EN 10025-6 – S460QL
EN 10025-6 - 1.8906
5 Information to be supplied by the purchaser
5.1 Mandatory information

The following information shall be supplied by the purchaser at the time of the order:

a) quantity to be delivered;

b) product form and the number of the standard for dimensions and tolerances (see 2.2);

c) nominal dimensions and tolerances on dimensions and shape (see 7.7.1);
d) steel designation (see 4.2.2);

e) additional requirements of inspection and testing and all required options (see 5.2 and Clause 13);

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EN 10025-6:2019 (E)
f) type of inspection document according to EN 10204 (see 8.1).
5.2 Options

A number of options are specified in Clause 13. In the event that the purchaser does not indicate his

wish to implement any of these options, the supplier shall supply in accordance with the basic

specification, see 5.1 a) to d) and f).
6 Manufacturing process
6.1 Steel making process

The steel making process is at the discretion of the manufacturer with the exclusion of the open hearth

(Siemens-Martin) process.
See Option 1, Clause 13 (details of manufacturing process).
6.2 Deoxidation and grain structure
Steels of EN 10025-6 shall:
— be fully killed;
— have a fine grain structure;

— contain nitrogen binding elements in amounts sufficient to bind the available nitrogen (for example

min. 0,020 % total aluminium). The usual guideline is a minimum aluminium to nitrogen ratio of

2:1, when no other nitrogen binding elements are present. Such other elements and their content

(% mass) shall be reported in the inspection document (see Table 1).
6.3 Delivery conditions

The products shall be supplied in the quenched and tempered condition (Q) as defined in Clause 3.

NOTE Direct quenching after hot-rolling followed by tempering is considered equivalent to conventional

quenching and tempering.
7 Requirements
7.1 General

The requirements in 7.2 and 7.3 apply for sampling, preparation of test pieces and testing specified in

Clauses 9 and 10.
7.2 Chemical composition

7.2.1 The chemical composition determined by heat analysis shall comply with the specified values of

Table 1.

For elements not defined in the table for the chemical composition for heat analysis, limit values of

Table 1 of EN 10020:2000 shall apply as maximum values.

7.2.2 The upper limits applicable for the product analysis are given in Table 2. The product analysis

shall be carried out when specified at the time of the order.
See Option 2, Clause 13 (product analysis).
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EN 10025-6:2019 (E)

For elements not defined in the table for the chemical composition for product analysis, limit values of

Table 1 of EN 10020:2000 shall apply as maximum values.

7.2.3 The maximum carbon equivalent values based on the heat analysis, given in Table 3 shall apply.

For determining the carbon equivalent value the following IIW (International Institute of Welding)

formula shall be used:
Cr++Mo V Ni+ Cu
CEV=C++ +
6 5 15

7.2.4 When products are supplied with a control on Si e.g. for hot-dip zinc-coating so that there could

be a need to increase the content of other elements like C and Mn to achieve the required tensile

properties, the maximum carbon equivalent values of Table 3 shall be increased as follows:

— for Si ≤ 0,04 %, increase the value of the CEV by 0,02;
— for Si ≤ 0,25 %, increase the value of the CEV by 0,01.
7.3 Mechanical properties
7.3.1 General

7.3.1.1 Under the inspection and testing conditions as specified in Clauses 8, 9 and 10 and in the

delivery condition as specified in 6.3 the mechanical properties shall comply with the values given in

Tables 4, 5 and 6.

The maximum stress-relief temperature should be at least 30 °C below the tempering temperature and

not be held for more than 1 h. As this temperature is normally not known in advance it is recommended

that the purchaser if he intends to perform a stress relief treatment to contact the steel producer. If the

purchaser intends to stress relief the products at higher temperatures or for longer times than

mentioned above the minimum values of the mechanical properties after such a treatment should be

agreed upon at the time of the order.

7.3.1.2 For the products specified in this document the nominal thickness applies.

7.3.2 Impact properties

7.3.2.1 The verification of the impact energy value shall be carried out, unless otherwise agreed

upon (see 7.3.2.2 and 7.3.2.3) with longitudinal test pieces for:
— quality Q at −20 °C;
— quality QL at −40 °C;
— quality QL1 at −60 °C.

7.3.2.2 Another temperature (given in Tables 5 and 6) may be agreed upon at the time of the order.

See Option 24, Clause 13 (Agreement on another impact test temperature).

7.3.2.3 If agreed upon at the time of the order the impact properties shall be verified on transverse

V-notch test pieces instead of longitudinal test pieces with minimum values as given in Table 6.

See Option 30, Clause 13 (Impact properties verified on transverse test pieces).
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EN 10025-6:2019 (E)

7.3.2.4 If specified at the time of the order on each heat treatment unit the impact properties only

or the impact properties and the tensile properties shall be verified.

See Option 13, Clause 13 (For each heat treatment unit impact properties only to be verified).

See Option 14, Clause 13 (For each heat treatment unit impact and tensile properties to be verified).

7.3.3 Improved deformation properties perpendicular to the surface

If agreed upon at the time of the order the products shall comply with one of the requirements of

EN 10164.
See Option 4, Clause 13 (Deformation properties perpendicular to the surface).
7.4 Technological properties
7.4.1 Weldability

The steels specified in this document do not have unlimited suitability for the various welding

processes, since the behaviour of a steel during and after welding depends not only on the material but

also on the dimensions and shape and on the manufacturing and service conditions of the components.

General requirements for arc welding of the steels specified in this document shall be as given in

EN 1011-2.

NOTE With increasing product thickness and strength level cold cracking can occur. Cold cracking is caused

by the following factors in combination:
— the amount of diffusible hydrogen in the weld metal;
— a brittle structure of the heat affected zone;
— significant tensile stress concentrations in the welded joint.
7.4.2 Formability and flame straightening
7.4.2.1 General

Recommendations regarding hot forming, cold forming and flame-straightening are laid out in

CEN/TR 10347.
7.4.2.2 Hot-forming

Hot forming is not recommended for quenched and tempered steels as the necessary heat treatment

after hot forming is very difficult to reproduce.
7.4.2.3 Cold formability
7.4.2.3.1 General

NOTE Cold forming leads to reduction in the ductility. Furthermore it is important to draw the attention to

the risk of brittle fracture in connection with hot-dip zinc coating.
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EN 10025-6:2019 (E)
7.4.2.3.2 Flangeability

If specified at the time of the order plates and wide flats with a nominal thickness ≤ 16 mm are suitable

for flanging without cracking with the indicative values for the inside minimum bend radii for cold

forming as given in Annex B.
See Option 11, Clause 13 (Flangeability without cracking).
7.4.3 Hot-dip zinc-coating

EN ISO 1461 should be used to specify coating requirements. EN ISO 14713-2 provides further

guidance, including information on the influence of various factors, including steel chemical

composition, on the coating formation.

Option 5, Clause 13 can be used to order steels with a chemical composition required for hot-dip zinc

coating. When option 5 is implemented, the purchaser and manufacturer
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten ZustandProduits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenuHot rolled products of structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition77.140.50SROL]GHONLFlat steel products and semi-products77.140.10Jekla za toplotno obdelavoHeat-treatable steelsICS:Ta slovenski standard je istoveten z:prEN 10025-6oSIST prEN 10025-6:2018en,fr,de01-september-2018oSIST prEN 10025-6:2018SLOVENSKI

STANDARD
oSIST prEN 10025-6:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 10025-6
June
t r s z ICS
y yä s v rä s râ
y yä s v rä w r Will supersede EN
s r r t wæ xã t r r v ªA sã t r r {English Version
Hot rolled products of structural steels æ Part

xã Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered conditionProduits laminés à chaud en aciers de construction æ Partie

x ã Conditions techniques de livraison pour produits plats des aciers à haute limite d 5élesticité à l 5état trempé et revenu

Warmgewalzte Erzeugnisse aus Baustählen æ Teil

xã Technische Lieferbedingungen für Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten Zustand This draft European Standard is submitted to CEN members for second enquiryä It has been drawn up by the Technical

If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä

This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä

Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä prEN

s r r t wæ xã t r s z EoSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 2.1 General standards ........................................................................................................................................... 6 2.2 Standards on tolerances on dimensions and shape ........................................................................... 7 2.3 Standards on testing ...................................................................................................................................... 7 3 Terms and definitions ................................................................................................................................... 7 4 Classification and designation .................................................................................................................... 7 4.1 Classification ..................................................................................................................................................... 7 4.1.1 Main quality classes ....................................................................................................................................... 7 4.1.2 Grades and qualities ...................................................................................................................................... 7 4.2 Designation........................................................................................................................................................ 8 5 Information to be supplied by the purchaser ....................................................................................... 8 5.1 Mandatory information ................................................................................................................................ 8 5.2 Options ................................................................................................................................................................ 9 6 Manufacturing process .................................................................................................................................. 9 6.1 Steel making process ..................................................................................................................................... 9 6.2 Deoxidation and grain structure ............................................................................................................... 9 6.3 Delivery conditions ........................................................................................................................................ 9 7 Requirements ................................................................................................................................................... 9 7.1 General ................................................................................................................................................................ 9 7.2 Chemical composition ................................................................................................................................... 9 7.3 Mechanical properties ................................................................................................................................ 10 7.3.1 General ............................................................................................................................................................. 10 7.3.2 Impact properties ........................................................................................................................................ 10 7.4 Technological properties .......................................................................................................................... 11 7.5 Surface properties ....................................................................................................................................... 12 7.6 Internal soundness ...................................................................................................................................... 12 7.7 Tolerances on dimensions and shape, mass ...................................................................................... 12 8 Inspection ....................................................................................................................................................... 12 8.1 General ............................................................................................................................................................. 12 8.2 Type of inspection and inspection document .................................................................................... 13 8.3 Tests to be carried out ................................................................................................................................ 13 9 Frequency of testing and preparation of samples and test pieces ............................................. 13 9.1 Frequency of testing .................................................................................................................................... 13 9.1.1 Chemical analysis ......................................................................................................................................... 13 9.1.2 Mechanical tests ........................................................................................................................................... 14 9.2 Preparation of samples and test pieces ............................................................................................... 14 9.2.1 Selection and preparation of samples for chemical analysis ....................................................... 14 9.2.2 Location of samples and orientation of test pieces for mechanical tests ................................ 14 9.2.3 Preparation of test pieces for mechanical tests ................................................................................ 14 9.3 Identification of samples and test pieces ............................................................................................ 15 10 Test methods ................................................................................................................................................. 15 oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 3 10.1 Chemical analysis ......................................................................................................................................... 15 10.2 Mechanical tests ............................................................................................................................................ 15 10.2.1 Tensile test ...................................................................................................................................................... 15 10.2.2 Impact test ....................................................................................................................................................... 16 10.3 Ultrasonic testing .......................................................................................................................................... 16 10.4 Retests .............................................................................................................................................................. 16 11 Marking, labelling, packaging .................................................................................................................. 16 12 Complaints ...................................................................................................................................................... 17 13 Options ............................................................................................................................................................. 17 Annex A (normative)

Location of samples and test pieces ........................................................................... 23 Annex B (informative)

Minimum recommended inside bend radii for flanging .................................. 24 Bibliography ................................................................................................................................................................. 25 oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 4 European foreword This document (prEN 10025-6:2018) has been prepared by Technical Committee ECISS/TC 103 “Structural steels other than reinforcements”, the secretariat of which is held by DIN. This document is currently submitted to the second CEN Enquiry. This document will supersede EN 10025-6:2004+A1:2009. This European Standard consists of the following parts, under the general title Hot rolled products of structural steels: Part 1: General Part 2: Technical delivery conditions for non-alloy structural steels Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion resistance Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition For a short transition period there will be a coexistence of EN 10025-1:2004 with EN 10025-2:2018 to EN 10025 «6:2018, since the new EN 10025-1 has to fulfil the requirements of the CPR and will therefore be published later. For this short transition period up-to-the publication of the next edition of part 1 the following has to be taken into account for EN 10025-1:2004: a) all dated and undated references to EN 10025-1:2004 to EN 10025-6:2004 are unchanged to this version with following exception: In 9.2.2.1 the reference must be 8.3.1 and 8.3.2 instead of 8.4.1 and 8.4.2; b) Clauses 5, 12 and 13 of EN 10025-1:2004 are no longer relevant. The main changes with respect to the previous edition are listed below: a) part 6 is now a stand-alone standard for technical delivery conditions including the preparation of samples and test pieces, the test methods, the marking, labelling and packaging and the drawings; b) for construction purposes this standard and part 1 must be used together; c) requirements for elements not definded were added to 7.2.1 and 7.2.2; d) Option 33 was added, Option 3 was renumbered to Option 24 and Option 9 was deleted; e) Si-content in 7.2.4 was changed; f) 7.4.3 concerning hot-dip zinc coating was modified; g) in Tables 3 and 4 the values were extended for thicknesses up to 200 mm; oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 5 h) references were updated and document editorial revised.

oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 6 1 Scope This document specifies technical delivery conditions for flat products of high yield strength alloy special steels. The grades and qualities are given in Tables 1 to 3 (chemical composition) and Tables 4 to 6 (mechanical properties) and are supplied in the quenched and tempered condition. The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal thickness of 3 mm and a maximum nominal thickness of 200 mm for grades S460, S500, S550, S620 and S690, a maximum nominal thickness of 125 mm for grades S890 and S960, in steels which, after quenching and tempering, have a specified minimum yield strength of 460 MPa to 960 MPa. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 2.1 General standards EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of ferritic steels EN 10020:2000, Definition and classification of grades of steel EN 10021, General technical delivery conditions for steel products EN 10025-1:2004, Hot rolled products of structural steels — Part 1: General technical delivery conditions EN 10027-1, Designation systems for steels — Part 1: Steel names EN 10027-2, Designation systems for steels — Part 2: Numerical system EN 10079, Definition of steel products EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 1: General requirements EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 2: Plate and wide flats EN 10164, Steel products with improved deformation properties perpendicular to the surface of the product — Technical delivery conditions EN 10168, Steel products — Inspection documents — List of information and description EN 10204, Metallic products — Types of inspection documents EN ISO 14713-2:2009, Zinc coatings — Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Part 2: Hot dip galvanizing (ISO 14713-2:2009) CR 10320, Optical emission analysis of low alloy steels (routine method) — Method for determination of C, Si, S, P, Mn, Cr, Ni and Cu oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 7 2.2 Standards on tolerances on dimensions and shape EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape EN 10048, Hot rolled narrow steel strip — Tolerances on dimensions and shape EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels — Tolerances on dimensions and shape 2.3 Standards on testing EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection method) EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1:2016) EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing (ISO 377) EN ISO 6892-1:2016, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO 6892-1:2016) EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical composition (ISO 14284) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 10079 and the following apply. 3.1 quenching operation which consists of cooling a ferrous product more rapidly than in still air 3.2 tempering heat treatment applied to a ferrous product generally after quench hardening or other heat treatment to bring the properties to the required level Note 1 to entry: Tempering consists of heating to specific temperatures (

prEN 10025-6:2018 (E) 8 — with specified minimum values of impact energy at temperatures not lower than

«20 °C, designated as Q; — with specified minimum values of impact energy at temperatures not lower than

« v r °C, designated as QL; — with specified minimum values of impact energy at temperatures not lower than

« x r °C, designated as QL1. 4.2 Designation 4.2.1 For the steel grades covered by this document the steel names shall be allocated in accordance with EN 10027-1; the steel numbers shall be allocated in accordance with EN 10027-2. 4.2.2 The designation shall consist of: — the number of this document (EN 10025-6); — the steel name or the steel number; the steel name consisting of: — the symbol S (for structural steel); — the indication of the minimum specified yield strength for thickness

¶ 50 mm expressed in MPa; — the delivery condition Q; — the capital letter L or L1 for the quality with specified minimum values of impact energy at temperatures not lower than

« v r
¹C or

« x r °C. EXAMPLE Structural steel (S) quenched and tempered (Q), with a specified minimum yield strength at room temperature of 460 MPa and with a specified minimum of impact energy at

« v r °C (L): EN 10025-6 – S460QL or EN 10025-6 - 1.8906 5 Information to be supplied by the purchaser 5.1 Mandatory information The following information shall be supplied by the purchaser at the time of the order: a) quantity to be delivered; b) product form and the number of the standard for dimensions and tolerances (see 2.2); c) nominal dimensions and tolerances on dimensions and shape (see 7.7.1); d) steel designation (see 4.2.2); e) additional requirements of inspection and testing and all required options (see 5.2 and Clause 13); f) type of inspection document according to EN 10204 (see 8.1). oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 9 5.2 Options A number of options are specified in Clause 13. In the event that the purchaser does not indicate his wish to implement any of these options, the supplier shall supply in accordance with the basic specification, see 5.1 a) to d) and f). 6 Manufacturing process 6.1 Steel making process The steel making process is at the discretion of the manufacturer with the exclusion of the open hearth (Siemens-Martin) process. See Option 1 (details of manufacturing process). 6.2 Deoxidation and grain structure Steels of EN 10025-6 shall: — be fully killed; — have a fine grain structure; — contain nitrogen binding elements in amounts sufficient to bind the available nitrogen (for example min. 0,020 % total aluminium). The usual guideline is a minimum aluminium to nitrogen ratio of 2:1, when no other nitrogen binding elements are present. Such other elements shall be reported in the inspection document (see Table 1). 6.3 Delivery conditions The products shall be supplied in the quenched and tempered condition (Q) as defined in Clause 3. NOTE Direct quenching after hot-rolling followed by tempering is considered equivalent to conventional quenching and tempering. 7 Requirements 7.1 General The requirements in 7.2 and 7.3 apply for sampling, preparation of test pieces and testing specified in Clauses 9 and 10. 7.2 Chemical composition 7.2.1 The chemical composition determined by ladle analysis shall comply with the specified values of Table 1. For elements not defined in the table for the chemical composition for ladle analysis, limit values of Table 1 of EN 10020:2000 shall apply as maximum values. 7.2.2 The upper limits applicable for the product analysis are given in Table 2. The product analysis shall be carried out when specified at the time of the order. See Option 2 (product analysis). For elements not defined in the table for the chemical composition for product analysis, limit values of Table 1 of EN 10020:2000 shall apply as maximum values. oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 10 7.2.3 The maximum carbon equivalent values based on the ladle analysis, given in Table 3 shall apply. For determining the carbon equivalent value the following IIW (International Institute of Welding) formula shall be used: +++=+++6515CrMoVNiCuMnCEVC 7.2.4 When products are supplied with a control on Si e.g. for hot-dip zinc-coating so that there could be a need to increase the content of other elements like C and Mn to achieve the required tensile properties, the maximum carbon equivalent values of Table 3 shall be increased as follows: — for Si

¶ 0,04 %, increase the value of the CEV by 0,02; — for Si

¶ 0,25 %, increase the value of the CEV by 0,01. 7.3 Mechanical properties 7.3.1 General 7.3.1.1 Under the inspection and testing conditions as specified in Clauses 8, 9 and 10 and in the delivery condition as specified in 6.3 the mechanical properties shall comply with the values given in Tables 4, 5 and 6. The maximum stress-relief temperature should be at least 30 °C below the tempering temperature and not be held for more than 1 h. As this temperature is normally not known in advance it is recommended that the purchaser if he intends to perform a stress relief treatment to contact the steel producer. If the purchaser intends to stress relief the products at higher temperatures or for longer times than mentioned above the minimum values of the mechanical properties after such a treatment should be agreed at the time of the order. 7.3.1.2 For the products specified in this document the nominal thickness applies. 7.3.2 Impact properties 7.3.2.1 The verification of the impact energy value shall be carried out, unless otherwise agreed (see 7.3.2.2 and 7.3.2.3) with longitudinal test pieces for: — quality Q at

«20 °C; — quality QL at
« v r °C; — quality QL s at

« x r °C. 7.3.2.2 Another temperature (given in Tables 5 and 6) may be agreed at the time of the order. See Option 24 (Agreement on another impact test temperature). 7.3.2.3 If agreed at the time of the order the impact properties shall be verified on transverse V-notch test pieces instead of longitudinal test pieces with minimum values as given in Table 6. See Option 30 (Impact properties verified on transverse test pieces). 7.3.2.4 If specified at the time of the order on each heat treatment unit the impact properties only or the impact properties and the tensile properties shall be verified. oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 11 See Option 13 (For each heat treatment unit impact properties only to be verified). See Option 14 (For each heat treatment unit impact and tensile properties to be verified). 7.3.3 Improved deformation properties perpendicular to the surface If agreed at the time of the order the products shall comply with one of the requirements of EN 10164. See Option 4 (Deformation properties perpendicular to the surface). 7.4 Technological properties 7.4.1 Weldability The steels specified in this document do not have unlimited suitability for the various welding processes, since the behaviour of a steel during and after welding depends not only on the material but also on the dimensions and shape and on the manufacturing and service conditions of the components. General requirements for arc welding of the steels specified in this document shall be as given in EN 1011-2. NOTE With increasing product thickness and strength level cold cracking can occur. Cold cracking is caused by the following factors in combination: — the amount of diffusible hydrogen in the weld metal; — a brittle structure of the heat affected zone; — significant tensile stress concentrations in the welded joint. 7.4.2 Formability and flame straightening 7.4.2.1 General NOTE Recommendations regarding hot forming, cold forming and flame-straightening are laid down in

CEN/TR 10347. 7.4.2.2 Hot-forming Hot forming is not recommended for quenched and tempered steels as the necessary heat treatment after hot forming is very difficult to reproduce. 7.4.2.3 Cold formability 7.4.2.3.1 General NOTE Cold forming leads to reduction in the ductility. Furthermore it is necessary to draw the attention to the risk of brittle fracture in connection with hot-dip zinc coating. 7.4.2.3.2 Flangeability If specified at the time of the order plates and wide flats with a nominal thickness

¶ 16 mm are suitable for flanging without cracking with the indicative values for the inside minimum bend radii for cold forming as given in Annex A. See Option 11 (Flangeability without cracking). 7.4.3 Hot-dip zinc-coating EN ISO 1461 should be used to specify coating requirements. EN ISO 14713-2 provides further guidance, including information on the influence of various factors, including steel chemical composition, on the coating formation. oSIST prEN 10025-6:2018

prEN 10025-6:2018 (E) 12 Option 5 can be used to order steels with a chemical composition required for hot-dip zinc coating. When option 5 is implemented, the purchaser and manufacturer shall agree to a steel composition (ladle analysis) of silicon and phosphorous according to either Category A (or steels satisfying the formula Si

¶ 0,03 % and Si+2,5P
¶ 0,09 %) or Category B (limited to 0,14 % < Si
¶ 0,25 %) or Category D (limited to 0,25 % < Si

¶ 0,35 %) with required values as cited by the ranges given in EN ISO 14713-2:2009, Table 1, column 2. NOTE 1 EN ISO 14713-2:2009, Table 1, gives guidance on typical coating characteristics associated with certain steel compositions on the basis of the surface composition of silicon and phosphorous. The maximum carbon equivalent shall be increased by 0,02 or by 0,01 (see 7.2.4). NOTE 2 Products quenched in water may be susceptible to stress corrosion cracking after hot-dip zinc-coating. See Option 5 (Chemical composition for hot dip zinc coating). In some cases steels above S460 may be sensitive to cracking during galvanizing and therefore special care should be taken. 7.5 Surface properties EN 10163-1 and EN 10163-2 shall apply for the permissible surface discontinuities for plates and wide flats and for the repair of surface defects by grinding and/or welding. Class A, subclass 1 of EN 10163-2 shall apply, class B regarding grinding or subclasses 2 or 3 regarding repair by welding can be agreed at the time of the order. See Option 15 (Other surface class for plates and wide flats). 7.6 Internal soundness Ultrasonic testing may be agreed at the time of the order and shall comply with 10.3. See Option 6 (Ultrasonic testing for flat products). 7.7 Tolerances on dimensions and shape, mass 7.7.1 Dimensions, tolerances on dimensions and shape shall be in accordance with the requirements given in the order by reference to the relevant documents according to 2.2. For hot rolled plate tolerances the basic requirements shall be in accordance with EN 10029, including thickness tolerances to class A, unless otherwise agreed at the time of the order. See Option 18 (For plates other thickness tolerance than class A) For plates cut from continuously hot rolled strip, the thickness tolerances shall be in accordance with EN 10051, unless otherwise agreed at the time of the order. See Option 34 (For plates cut from strip thickness tole

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten ZustandProduits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenuHot rolled products of structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition77.140.50SROL]GHONLFlat steel products and semi-products77.140.10Jekla za toplotno obdelavoHeat-treatable steelsICS:Ta slovenski standard je istoveten z:prEN 10025-6oSIST prEN 10025-6:2014en,fr,de01-julij-2014oSIST prEN 10025-6:2014SLOVENSKI

STANDARD
oSIST prEN 10025-6:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
WHITE DRAFT prEN 10025-6

May 2014 ICS 77.140.10; 77.140.50 Will supersede EN 10025-6:2004+A1:2009English Version

Hot rolled products of structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition

Produits laminés à chaud en aciers de construction - Partie 6 : Conditions techniques de livraison pour produits plats des aciers à haute limite d'élesticité à l'état trempé et revenu

Warmgewalzte Erzeugnisse aus Baustählen - Teil 6: Technische Lieferbedingungen für Flacherzeugnisse aus Stählen mit höherer Streckgrenze im vergüteten Zustand This draft European Standard is submitted to ECISS/COCOR before submission to CEN members for formal vote. It has been drawn up by the Technical Committee ECISS/TC 103.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 10025-6:2014 EoSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................3 1 Scope ......................................................................................................................................................4 2 Normative references ............................................................................................................................4 2.1 General Standards .................................................................................................................................4 2.2 Standards on dimensions and tolerances (see 7.7.1) ........................................................................5 2.3 Standards on testing .............................................................................................................................5 3 Terms and definitions ...........................................................................................................................5 4 Classification and designation .............................................................................................................5 4.1 Classification ..........................................................................................................................................5 4.2 Designation ............................................................................................................................................6 5 Information to be supplied by the purchaser .....................................................................................6 5.1 Mandatory information ..........................................................................................................................6 5.2 Options ...................................................................................................................................................7 6 Manufacturing process .........................................................................................................................7 6.1 Steel making process ............................................................................................................................7 6.2 Deoxidation or grain size ......................................................................................................................7 6.3 Delivery conditions ................................................................................................................................7 7 Requirements .........................................................................................................................................7 7.1 General ....................................................................................................................................................7 7.2 Chemical composition ..........................................................................................................................7 7.3 Mechanical properties ...........................................................................................................................8 7.4 Technological properties ......................................................................................................................8 7.5 Surface properties .............................................................................................................................. 10 7.6 Internal soundness ............................................................................................................................. 10 7.7 Tolerances on dimensions and shape, mass .................................................................................. 10 8 Inspection ............................................................................................................................................ 10 8.1 General ................................................................................................................................................. 10 8.2 Type of inspection and inspection document ................................................................................. 10 8.3 Frequency of testing .......................................................................................................................... 10 8.4 Tests to be carried out ....................................................................................................................... 11 9 Preparation of samples and test pieces ........................................................................................... 12 9.1 Selection and preparation of samples for chemical analysis ........................................................ 12 9.2 Location and orientation of samples and test pieces for mechanical tests ................................. 12 9.3 Identification of samples and test pieces ........................................................................................ 12 10 Test methods ....................................................................................................................................... 12 10.1 Chemical analysis ............................................................................................................................... 12 10.2 Mechanical tests ................................................................................................................................. 12 10.3 Ultrasonic testing................................................................................................................................ 13 10.4 Retests ................................................................................................................................................. 13 11 Marking, labelling, packaging ............................................................................................................ 13 12 Complaints .......................................................................................................................................... 13 13 Options (see 5.2) ................................................................................................................................. 13 Annex A (informative)

Minimum recommended inside bend radii for flanging ......................................... 20 Bibliography ..................................................................................................................................................... 21

oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 3 Foreword This document (prEN 10025-6:2014) has been prepared by Technical Committee ECISS/TC 103 “Structural steels other than reinforcements”, the secretariat of which is held by DIN. This document is currently submitted to the COCOR Vote. This document will supersede EN 10025-6:2004:2004+A1:2009. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. The titles of the other parts of this document are: Part 1: General; Part 2: Technical delivery conditions for non-alloy structural steels; Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels; Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels; Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion resistance oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 4

1 Scope Part 6 of this document, in addition to part 1, specifies technical delivery conditions for flat products of high yield strength alloy special steels. The grades and qualities are given in Tables 1 to 3 (chemical composition) and Tables 4 to 6 (mechanical properties) and are supplied in the quenched and tempered condition as given in 6.3. The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal thickness of 3 mm and a maximum nominal thickness of 150 mm for grades S460, S500, S550, S620 and S690, a maximum nominal thickness of 100 mm for grades S890 and S960, in steels which, after quenching and tempering, have a specified minimum yield strength of 460 MPa1) to 960 MPa1). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 2.1 General Standards EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of ferritic steels EN 10020:2000, Definition and classification of grades of steel EN 10021, General technical delivery conditions for steel products prEN 10025-1:2014, Hot rolled products of structural steels — Part 1: General EN 10027-1, Designation systems for steels — Part 1: Steel names EN 10027-2, Designation systems for steels — Part 2: Numerical system EN 10079:2007, Definition of steel products EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 1: General requirements EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 2: Plates and wide flats EN 10164, Steel products with improved deformation properties perpendicular to the surface of the product — Technical delivery conditions EN 10168, Steel products – Inspection documents – List of information and description EN 10204, Metallic products – Types of inspection documents EN ISO 14713-2:2009, Guidelines and recommendations for the protection against corrosion of iron and steel structures – Zinc coating – Part 2: Hot dip galvanizing (ISO 14713-2:2009)

1) 1 MPa = 1 N/mm². oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 5 2.2 Standards on dimensions and tolerances (see 7.7.1) EN 10029, Hot rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape EN 10048, Hot rolled narrow steel strip — Tolerances on dimensions and shape EN 10051, Continuously hot-rolled uncoated plate, sheet and strip of non-alloy and alloy steels — Tolerances on dimensions and shape 2.3 Standards on testing EN 10160, Ultrasonic testing of steel flat product of thickness equal to or greater than 6 mm (reflection method) EN ISO 148-1, Metallic materials – Charpy pendulum impact test – Part 1: Test method (ISO 148-1:2009) EN ISO 6892-1, Metallic materials – Tensile testing – Part 1: Method of test at room temperature (ISO 6892-1:2009) EN ISO 14284, Steel and iron – Sampling and preparation of samples for the determination of chemical composition (ISO 14284:1996) 3 Terms and definitions For the purposes of this document, the terms and definitions given in prEN 10025-1:2014 and the following apply.

3.1 quenching operation which consists of cooling a ferrous product more rapidly than in still air 3.2 tempering heat treatment applied to a ferrous product generally after quench hardening or other heat treatment to bring the properties to the required level Note

1 to entry Tempering consists of heating to specific temperatures (< AC1) and soaking one or more times followed by cooling at an appropriate rate. 4 Classification and designation 4.1 Classification 4.1.1 Main quality classes The steel grades specified in this document shall be classified as alloy special steels according to EN 10020. 4.1.2 Grades and qualities This document specifies seven steel grades. They differ in their minimum yield strength at room temperature. All the grades can be delivered in the following qualities as specified at the time of the order:  with specified minimum values of impact energy at temperatures not lower than -20 °C, designated as Q;

 with specified minimum values of impact energy at temperatures not lower than -40 °C, designated as QL;  with specified minimum values of impact energy at temperatures not lower than -60 °C, designated as QL1. oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 6 4.2 Designation 4.2.1 The designation shall be in accordance with prEN 10025-1. 4.2.2 The designation shall consist of:  the number of this document (prEN 10025-6);  the steel name or the steel number; the steel name consisting of:  the symbol S (for structural steel);  the indication of the minimum specified yield strength for thickness ≤ 50 mm expressed in MPa1);  the delivery condition Q;  the capital letter L or L1 for the quality with specified minimum values of impact energy at temperatures not lower than -40 °C or -60 °C. EXAMPLE Structural steel (S) quenched and tempered (Q), with a specified minimum yield strength at room temperature of 460 MPa1) and with a specified minimum value of impact energy at -40 °C (L):

Steel prEN 10025-6 – S460QL

Steel prEN 10025-6 - 1.8906 5 Information to be supplied by the purchaser 5.1 Mandatory information The following information shall be supplied by the purchaser at the time of the order: a) quantity to be delivered; b) product form; c) number of the relevant part of this document; d) steel name or the steel number (see 4.2.2); e) nominal dimensions and tolerances on dimensions and shape (see 7.7.1); f) additional requirements of inspection and testing as specified in prEN 10025-6; g) type of inspection document according to EN 10204 (see 8.2); h) all required options (see 5.2).

1 MPa = 1 N/mm². oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 7 5.2 Options A number of options are specified in Clause 13. In the event that the purchaser does not indicate his wish to implement any of these options, the supplier shall supply in accordance with the basic specification (see 5.1 a) to g)). 6 Manufacturing process 6.1 Steel making process The steel making process is at the discretion of the manufacturer with the exclusion of the open hearth (Siemens-Martin) process. See option 1. 6.2 Deoxidation or grain size The steels specified in this document shall be fully killed. The steels shall have a fine grain structure containing nitrogen binding elements in amounts sufficient to bind the nitrogen. 6.3 Delivery conditions The products shall be supplied in the quenched and tempered condition (Q) as defined in Clause 3. NOTE Direct quenching after hot-rolling followed by tempering is considered equivalent to conventional quenching and tempering 7 Requirements 7.1 General The following requirements apply when sampling, preparation of test pieces and testing specified in Clauses 8, 9 and 10 are carried out. 7.2 Chemical composition 7.2.1 The chemical composition determined by ladle analysis shall comply with the specified values of Table 1. On special request of the purchaser the manufacturer shall inform the purchaser at the time of the order which of the alloying elements appropriate to the steel grade required will be deliberately added to the material to be delivered. See option 29. For elements not defined in tables for the chemical composition for ladle analysis, limit values of Table 1 of

EN 10020:2000 shall apply as maximum values. 7.2.2 The limits applicable for the product analysis are given in Table 2. The product analysis shall be carried out when specified at the time of the order. See option 2. For elements not defined in tables for the chemical composition for product analysis, limit values of Table 1 of

EN 10020:2000 shall apply as maximum values. 7.2.3 The maximum carbon equivalent values based on the ladle analysis, given in Table 3 shall apply. For the carbon equivalent value formula see 4.4 of prEN 10025-1:2014. oSIST prEN 10025-6:2014

prEN 10025-6:2014 (E) 8 7.2.4 When products are supplied with a control on Si e.g. for hot-dip zinc-coating so that there could be a need to increase the content of other elements like C and Mn to achieve the required tensile properties, the maximum carbon equivalent values of Table 3 shall be increased as follows:  for Si ≤ 0,04 %, increase the value of the CEV by 0,02;  for Si ≤ 0,25 %, increase the value of the CEV by 0,01. 7.3 Mechanical properties 7.3.1 General 7.3.1.1 Under the inspection and testing conditions as specified in Clauses 8, 9 and 10 and in the delivery condition as specified in 6.3 the mechanical properties shall comply with the values given in Tables 4, 5 and 6. NOTE The maximum stress-relief temperature should be at least 30 °C below the tempering temperature. As this temperature is normally not known in advance it is commended that the purchaser if he intends to perform a post weld heat treatment to contact th

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