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

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.

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
Publication Date
13-Aug-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
19-Sep-2012

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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
---------------------- Page: 2 ----------------------
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;
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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.
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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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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 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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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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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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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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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
...

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