SIST EN 10025-6:2019
(Main)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
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
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Standards Content (Sample)
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.
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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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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
3
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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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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.
5
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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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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
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);
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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
Mn
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 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.
---------------------- 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.
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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
2
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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
3
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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;
4
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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.
5
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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
6
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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.
7
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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
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);
8
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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).
9
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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
Mn
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).
10
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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
...
SLOVENSKI STANDARD
oSIST prEN 10025-6:2018
01-september-2018
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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: prEN 10025-6
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.50 3ORãþDWLMHNOHQLL]GHONLLQ Flat steel products and semi-
SROL]GHONL products
oSIST prEN 10025-6:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 10025-6:2018
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oSIST prEN 10025-6:2018
DRAFT
EUROPEAN STANDARD
prEN 10025-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2018
ICS 77.140.10; 77.140.50 Will supersede 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 draft European Standard is submitted to CEN members for second enquiry. 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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10025-6:2018 E
worldwide for CEN national Members.
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oSIST prEN 10025-6:2018
prEN 10025-6:2018 (E)
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
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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
3
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prEN 10025-6:2018 (E)
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;
4
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h) references were updated and document editorial revised.
5
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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
6
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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 (
C1
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 steel grades may be supplied in the following qualities as specified at the time of the order:
7
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— 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
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).
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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.
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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:
Cr++Mo V Ni+ Cu
Mn
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 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 −40 °C;
— quality QL1 at −60 °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.
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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.
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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.
...
SLOVENSKI STANDARD
oSIST prEN 10025-6:2014
01-julij-2014
9URþHYDOMDQLL]GHONLL]NRQVWUXNFLMVNLKMHNHOGHO 7HKQLþQLGREDYQLSRJRML]D
SORãþDWHL]GHONHL]NRQVWUXNFLMVNLKMHNHO]YHOLNRSODVWLþQRWUGQRVWMRYNDOMHQHPLQ
SRSXãþHQHPVWDQMX
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: prEN 10025-6
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.50 3ORãþDWLMHNOHQLL]GHONLLQ Flat steel products and semi-
SROL]GHONL products
oSIST prEN 10025-6:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
WHITE DRAFT
prEN 10025-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2014
ICS 77.140.10; 77.140.50 Will supersede 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 - Partie Warmgewalzte Erzeugnisse aus Baustählen - Teil 6:
6 : Conditions techniques de livraison pour produits plats Technische Lieferbedingungen für Flacherzeugnisse aus
des aciers à haute limite d'élesticité à l'état trempé et Stählen mit höherer Streckgrenze im vergüteten Zustand
revenu
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 Ref. No. prEN 10025-6:2014 E
worldwide for CEN national Members.
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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
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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
3
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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
1) 1)
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
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.
4
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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 (< A ) and soaking one or more times
C1
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.
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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);
1)
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
1)
temperature of 460 MPa and with a specified minimum value of impact energy at -40 °C (L):
Steel prEN 10025-6 – S460QL
or
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) 1 MPa = 1 N/mm².
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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.
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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 the steel producer. If the purchaser intends to stress relief the products at higher temperatures or
...
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