SIST EN 10025-4:2019

SLOVENSKI STANDARD
oSIST prEN 10025-4:2018
01-september-2018
9URþHYDOMDQLL]GHONLL]NRQVWUXNFLMVNLKMHNHOGHO7HKQLþQLGREDYQLSRJRML]D
WHUPRPHKDQVNRREGHODQDYDOMDQDYDULYDGUREQR]UQDWDNRQVWUXNFLMVNDMHNOD
Hot rolled products of structural steels - Part 4: Technical delivery conditions for
thermomechanical rolled weldable fine grain structural steels
Warmgewalzte Erzeugnisse aus Baustählen - Teil 4: Technische Lieferbedingungen für
thermomechanisch gewalzte schweißgeeignete Feinkornbaustähle
Produits laminés à chaud en aciers de construction - Partie 4 : Conditions techniques de
livraison pour les aciers de construction soudable à grains fins obtenus par laminage
thermomécanique
Ta slovenski standard je istoveten z: prEN 10025-4
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 10025-4:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10025-4:2018

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oSIST prEN 10025-4:2018


DRAFT
EUROPEAN STANDARD
prEN 10025-4
NORME EUROPÉENNE

EUROPÄISCHE NORM

June 2018
ICS 77.140.10; 77.140.50 Will supersede EN 10025-4:2004
English Version

Hot rolled products of structural steels - Part 4: Technical
delivery conditions for thermomechanical rolled weldable
fine grain structural steels
Produits laminés à chaud en aciers de construction - Warmgewalzte Erzeugnisse aus Baustählen - Teil 4:
Partie 4 : Conditions techniques de livraison pour les Technische Lieferbedingungen für thermomechanisch
aciers de construction soudable à grains fins obtenus gewalzte schweißgeeignete Feinkornbaustähle
par laminage thermomécanique
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 10025-4:2018 E
worldwide for CEN national Members.

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oSIST prEN 10025-4:2018
prEN 10025-4:2018 (E)
Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
2.1 General standards . 6
2.2 Standards on dimensions and tolerances . 7
2.3 Standards on testing . 7
3 Terms and definitions . 8
4 Classification and designation . 8
4.1 Classification . 8
4.1.1 Main quality classes . 8
4.1.2 Grades and qualities . 8
4.2 Designation . 9
5 Information to be supplied by the purchaser . 9
5.1 Mandatory information . 9
5.2 Options . 9
6 Manufacturing process . 9
6.1 Steel making process . 9
6.2 Deoxidation and grain structure . 10
6.3 Delivery conditions . 10
7 Requirements . 10
7.1 General . 10
7.2 Chemical composition . 10
7.3 Mechanical properties . 11
7.3.1 General . 11
7.3.2 Impact properties . 11
7.3.3 Improved deformation properties perpendicular to the surface . 11
7.4 Technological properties . 11
7.4.1 Weldability . 11
7.4.2 Formability and flame straightening . 12
7.4.3 Hot-dip zinc-coating . 12
7.5 Surface properties . 13
7.5.1 Strip . 13
7.5.2 Plates and wide flats . 13
7.5.3 Sections . 13
7.5.4 Bars and rods . 13
7.6 Internal soundness . 13
7.7 Dimensions, tolerances on dimensions and shape, mass . 13
8 Inspection . 14
8.1 General . 14
8.2 Type of inspection and inspection document . 14
8.3 Tests to be carried out . 14
9 Frequency of testing and preparation of samples and test pieces . 15
9.1 Frequency of testing. 15
9.1.1 Chemical analysis . 15
9.1.2 Mechanical tests . 15
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prEN 10025-4:2018 (E)
9.2 Preparation of samples and test pieces . 15
9.2.1 Selection and preparation of samples for chemical analysis . 15
9.2.2 Location of samples and orientation of test pieces for mechanical tests . 15
9.2.3 Preparation of test pieces for mechanical tests . 15
9.3 Identification of samples and test pieces . 16
10 Test methods . 16
10.1 Chemical analysis . 16
10.2 Mechanical tests . 17
10.2.1 Tensile test . 17
10.2.2 Impact test . 17
10.3 Ultrasonic testing . 17
10.4 Retests . 17
11 Marking, labelling, packaging . 17
12 Complaints . 18
13 Options . 18
Annex A (normative) Location of samples and test pieces . 25
Bibliography . 28
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oSIST prEN 10025-4:2018
prEN 10025-4:2018 (E)
European foreword
This document (prEN 10025-4:2018) 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 10025-4:2004.
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 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 4 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) key to Figure A.1 was updated;
h) steel grade S500M was added;
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oSIST prEN 10025-4:2018
prEN 10025-4:2018 (E)
i) Annex B deleted;
j) references were updated and document editorial revised.

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oSIST prEN 10025-4:2018
prEN 10025-4:2018 (E)
1 Scope
This document specifies technical delivery conditions for flat and long products of hot rolled weldable fine
grain structural steels in the thermomechanical rolled condition in the grades and qualities given in Tables
1 to 3 (chemical composition) and Tables 4 to 6 (mechanical properties) in thickness ≤ 150 mm.
The steels specified in this document are especially intended for use in heavily loaded parts of welded
structures such as, bridges, flood gates, storage tanks, water supply tanks, etc., for service at ambient and
low temperatures.
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.
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 10163-3, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections —
Part 3: Sections
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
CR 10320, Optical emission analysis of low alloy steels (routine method) — Method for determination of C, Si,
S, P, Mn, Cr, Ni and Cu
CEN/TR 10347, Guidance for forming of structural steels in processing
FprEN ISO 9443:2018, Surface quality classes for hot-rolled bars and wire rod (ISO/FDIS 9443:2018)
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prEN 10025-4:2018 (E)
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)
2.2 Standards on dimensions and tolerances
EN 10017, Steel rod for drawing and/or cold rolling — Dimensions and tolerances
EN 10024, Hot rolled taper flange I sections — Tolerances on shape and dimensions
EN 10029, Hot-rolled steel plates 3 mm thick or above — Tolerances on dimensions and shape
EN 10034, Structural steel I and H sections — Tolerances on shape and dimensions
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 10055, Hot rolled steel equal flange tees with radiused root and toes — Dimensions and tolerances on
shape and dimensions
EN 10056-1, Structural steel equal and unequal leg angles — Part 1: Dimensions
EN 10056-2, Structural steel equal and unequal leg angles — Part 2: Tolerances on shape and dimensions
EN 10058, Hot rolled flat steel bars for general purposes — Dimensions and tolerances on shape and
dimensions
EN 10059, Hot rolled square steel bars for general purposes — Dimensions and tolerances on shape and
dimensions
EN 10060, Hot rolled round steel bars for general purposes — Dimensions and tolerances on shape and
dimensions
EN 10061, Hot rolled hexagon steel bars for general purposes — Dimensions and tolerances on shape and
dimensions
EN 10067, Hot rolled bulb flats — Dimensions and tolerances on shape, dimensions and mass
EN 10279, Hot rolled steel channels — Tolerances on shape, dimensions and mass
EN 10363, Continuously hot-rolled patterned steel strip and plate/sheet cut from wide strip — Tolerances on
dimensions and shape
EN 10365, Hot rolled steel channels, I and H sections — Dimensions and masses
2.3 Standards on testing
EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection method)
EN 10306, Iron and steel — Ultrasonic testing of H beams with parallel flanges and IPE beams
EN 10308, Non destructive testing — Ultrasonic testing of steel bars
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1)
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prEN 10025-4:2018 (E)
EN ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing (ISO 377:2017)
EN ISO 643, Steels — Micrographic determination of the apparent grain size (ISO 643)
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.
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
thermomechanical rolling
rolling process in which the final deformation is carried out in a certain temperature range leading to a
material condition with certain properties which cannot be achieved or repeated by heat treatment alone
Note 1 to entry: Thermomechanical rolling can include processes with an increasing cooling rate with or without
tempering including self-tempering but excluding direct quenching and quenching and tempering.
Note 2 to entry: In some publications the word TMCP (Thermomechanical Control Process) is also used.
3.2
fine grain steels
steels with fine grain structure with an equivalent index of ferritic grain size ≥ 6
Note 1 to entry: For the determination of grain sizes see EN ISO 643.
4 Classification and designation
4.1 Classification
4.1.1 Main quality classes
All steel grades specified in this document shall be classified as alloy special steels according to EN 10020
except grade S275 which is a non-alloy quality steel.
4.1.2 Grades and qualities
This document specifies five steel grades S275, S355, S420, S460 and S500. 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
M;
— with specified minimum values of impact energy at temperatures not lower than −50 °C, designated as
ML.
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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:
— number of this document (EN 10025-4);
— steel name or the steel number; the steel name consisting of:
— symbol S (for structural steel);
— indication of the minimum specified yield strength for thickness ≤ 16 mm expressed in MPa;
— delivery condition M;
— capital letter L for the quality with specified minimum values of impact energy at temperatures not
lower than −50 °C.
EXAMPLE Thermomechanical rolled structural steel (S) with a specified minimum yield strength at room
temperature of 355 MPa and with a specified minimum impact energy at −50 C:
EN 10025-4 - S355ML
or
EN 10025-4 - 1.8834
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).
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).
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6.2 Deoxidation and grain structure
Steels of EN 10025-4 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 thermomechanical rolled condition as defined in Clause 3.
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 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 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 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.
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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 to 6.
Stress relieving at more than 580 °C or for over 1 h may lead to a deterioration of the mechanical properties
of the steel grades. 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 flat products the nominal thickness applies. For long products of irregular section the
nominal thickness of that part from which the samples are taken applies (see Annex A).
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 M at −20 °C;
— quality ML at −50 °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 for flat products out of each parent plate or coil the impact
properties only or the impact properties and the tensile properties shall be verified.
See Option 13 (For flat products on each parent plate or coil impact properties only to be verified).
See Option 14 (For flat products on each parent plate or coil impact and tensile properties to be verified).
7.3.3 Improved deformation properties perpendicular
...

SLOVENSKI STANDARD
oSIST prEN 10025-4:2014
01-julij-2014
9URþHYDOMDQLL]GHONLL]NRQVWUXNFLMVNLKMHNHOGHO7HKQLþQLGREDYQLSRJRML]D
WHUPRPHKDQVNRREGHODQDYDOMDQDYDULYDGUREQR]UQDWDNRQVWUXNFLMVNDMHNOD
Hot rolled products of structural steels - Part 4: Technical delivery conditions for
thermomechanical rolled weldable fine grain structural steels
Warmgewalzte Erzeugnisse aus Baustählen - Teil 4: Technische Lieferbedingungen für
thermomechanisch gewalzte schweißgeeignete Feinkornbaustähle
Produits laminés à chaud en aciers de construction - Partie 4 : Conditions techniques de
livraison pour les aciers de construction soudable à grains fins obtenus par laminage
thermomécanique
Ta slovenski standard je istoveten z: prEN 10025-4
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 10025-4:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10025-4:2014

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oSIST prEN 10025-4:2014

EUROPEAN STANDARD
WHITE DRAFT
prEN 10025-4
NORME EUROPÉENNE

EUROPÄISCHE NORM

May 2014
ICS 77.140.10; 77.140.50 Will supersede EN 10025-4:2004
English Version
Hot rolled products of structural steels - Part 4: Technical
delivery conditions for thermomechanical rolled weldable fine
grain structural steels
Produits laminés à chaud en aciers de construction - Partie Warmgewalzte Erzeugnisse aus Baustählen - Teil 4:
4 : Conditions techniques de livraison pour les aciers de Technische Lieferbedingungen für thermomechanisch
construction soudable à grains fins obtenus par laminage gewalzte schweißgeeignete Feinkornbaustähle
thermomécanique
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 10025-4:2014 E
worldwide for CEN national Members.

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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
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 . 6
4 Classification and designation . 6
4.1 Classification. 6
4.2 Designation . 6
5 Information to be supplied by the purchaser . 7
5.1 Mandatory information . 7
5.2 Options . 7
6 Manufacturing process . 7
6.1 Steel making process . 7
6.2 Grain structure . 8
6.3 Delivery conditions . 8
7 Requirements . 8
7.1 General . 8
7.2 Chemical composition . 8
7.3 Mechanical properties . 8
7.4 Technological properties . 9
7.5 Surface properties .11
7.6 Internal soundness .11
7.7 Dimensions, tolerances on dimensions and shape, mass .11
8 Inspection .12
8.1 General .12
8.2 Type of inspection and inspection document .12
8.3 Frequency of testing .12
8.4 Tests to be carried out .13
9 Preparation of samples and test pieces .13
9.1 Selection and preparation of samples for chemical analysis .13
9.2 Location and orientation of samples and test pieces for mechanical tests .13
9.3 Identification of samples and test pieces .14
10 Test methods.14
10.1 Chemical analysis .14
10.2 Mechanical tests .14
10.3 Ultrasonic testing .14
10.4 Retests .14
11 Marking, labelling, packaging.14
12 Complaints .15
13 Options (see 5.2) .15
Bibliography .22

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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
Foreword
This document (prEN 10025-4:2014) 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 10025-4:2004.
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 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.

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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
1 Scope
Part 4 of this document, in addition to Part 1, specifies technical delivery conditions for flat and long products of
hot rolled weldable fine grain structural steels in the thermomechanical rolled condition in the grades and qualities
given in Tables 1 to 3 (chemical composition) and Tables 4 to 6 (mechanical properties) in thickness ≤ 120 mm for
flat products and in thickness ≤ 150 mm for long products.
In addition to prEN 10025-1:2014 the steels specified in this document are especially intended for use in heavily
loaded parts of welded structures such as, bridges, flood gates, storage tanks, water supply tanks, etc., for
service at ambient and low temperatures.
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 10163-3, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections – Part 3:
Sections
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 10221, Surface quality classes for hot-rolled round bars and rods - Technical delivery conditions
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)
CEN/TR 10347, Guidance for forming of structural steels in processing
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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
2.2 Standards on dimensions and tolerances (see 7.7.1)
EN 10017, Non-alloy steel rod for drawing and/or cold rolling – Dimensions and tolerances
EN 10024, Hot rolled taper flange I sections - Tolerances on shape and dimensions
EN 10029, Hot rolled steel plates 3 mm thick or above - Tolerances on dimensions and shape
EN 10034, Structural steel I and H sections - Tolerances on shape and dimensions
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
EN 10055, Hot-rolled steel equal flange tees with radiused root and toes - Dimensions and tolerances on shape
and dimensions
EN 10056-1, Structural steel equal and unequal leg angles - Part 1: Dimensions
EN 10056-2, Structural steel equal and unequal leg angles - Part 2: Tolerances on shape and dimensions
EN 10058, Hot rolled flat steel bars for general purposes - Dimensions and tolerances on shape and dimensions
EN 10059, Hot rolled square steel bars - Dimensions and tolerances on shape and dimensions
EN 10060, Hot rolled round steel bars - Dimensions and tolerances on shape and dimensions
EN 10061, Hot rolled hexagon steel bars - Dimensions and tolerances on shape and dimensions
EN 10067, Hot rolled bulb flats - Dimensions and tolerances on shape, dimensions and mass
EN 10279, Hot rolled steel channels - Tolerances on shape, dimensions and mass
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 10306, Iron and steel - Ultrasonic testing of H beams with parallel flanges and IPE beams
EN 10308, Non-destructive testing - Ultrasonic testing of steel bars
EN ISO 148-1, Metallic materials – Charpy pendulum impact test – Part 1: Test method (ISO 148-1:2009)
EN ISO 643, Steels – Micrographic determination of the apparent grain size (ISO 643:2003)
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)
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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
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
thermomechanical rolling
rolling process in which the final deformation is carried out in a certain temperature range leading to a material
condition with certain properties which cannot be achieved or repeated by heat treatment alone
Note 1 to entry Hot forming or post weld heat treatment at a temperature above 580 °C may lower the strength values and
should not be performed. Flame straightening can be applied in accordance with CEN/TR 10347.
Note 2 to entry Thermomechanical rolling can include processes with an increasing cooling rate with or without tempering
including self-tempering but excluding direct quenching and quenching and tempering.
Note 3 to entry In some publications the word TMCP (Thermomechanical Control Process) is also used.
3.2
fine grained steels
steels with fine grain structure with an equivalent index of ferritic grain size ≥ 6
Note 1 to entry For the determination of grain sizes see EN ISO 643.
4 Classification and designation
4.1 Classification
4.1.1 Main quality classes
All steel grades specified in this document shall be classified as alloy special steels according to EN 10020 except
grade S275 which is a non-alloy quality steel.
4.1.2 Grades and qualities
This document specifies five steel grades S275, S355, S420, S460 and S500. 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 M;
− with specified minimum values of impact energy at temperatures not lower than -50 °C, designated as ML.
4.2 Designation
4.2.1 The designation shall be in accordance with prEN 10025-1.
4.2.2 The designation shall consist of:
− number of this document (prEN 10025-4);
− steel name or the steel number; the steel name consisting of:
− symbol S (for structural steel);
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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
)
1
− indication of the minimum specified yield strength for thickness ≤ 16 mm expressed in MPa ;
− delivery condition M;
− capital letter L for the quality with specified minimum values of impact energy at temperatures not lower
than -50 °C.
EXAMPLE Thermomechanical rolled structural steel (S) with a specified minimum yield strength at room temperature of

1)
355 MPa and with a specified minimum value of impact energy at -50 ºC:
Steel prEN 10025-4 - S355ML
or
Steel prEN 10025-4 - 1.8834
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 10025-4;
g) type of inspection document according to EN 10204 (see 8.2);
h) all required options (see 5.2).
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.

) 2
1
1 MPa = 1 N/mm .
1) 1 MPa = 1 N/mm²
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prEN 10025-4:2014 (E)
6.2 Grain structure
The steels shall have a fine grain structure containing sufficient amounts of nitrogen binding elements (see
Table 1).
6.3 Delivery conditions
The products shall be supplied in the thermomechanical rolled condition as defined in Clause 3.
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 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.
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.
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 to 6.
NOTE Stress relieving at more than 580 °C or for over 1 h may lead to a deterioration of the mechanical properties of the
steel grades as defined in prEN 10025-4. 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.
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7.3.1.2 For flat products the nominal thickness applies. For long products of irregular section the nominal
thickness of that part from which the samples are taken applies (see Annex A of prEN 10025-1:2014).
7.3.2 Impact properties
7.3.2.1 The verification of the impact energy value shall be carried out in accordance with prEN 10025-1.
Furthermore 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:
− M at -20 ºC;
− ML at -50 ºC.
7.3.2.2 Another temperature (given in Tables 5 and 6) may be agreed at the time of the order.
See option 3.
7.3.2.3 If agreed at the time of the order transverse impact energy values as given in Table 6 shall apply
instead of longitudinal values.
See option 30.
7.3.3 Improved deformation properties perpendicular to the surface
If agreed at the time of the order flat and long products shall comply with one of the requirements of EN 10164.
See option 4.
7.4 Technological properties
7.4.1 Weldability
The steels specified in this document shall be suitable for welding.
General requirements for arc welding of the steels specified in this document shall be as given in EN 1011-2.
NOTE 1 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.
NOTE 2 Due to their favourable chemical composition in comparison to a normalized steel at the same yield strength level,
thermomechanically treated steels according to prEN 10025-4:2014 exhibit enhanced weldability.
7.4.2 Formability and flame straightening
NOTE Recommendations regarding hot forming, cold forming and flame straightening are laid down in CEN/TR 10347.
7.4.2.1 Hot forming
Hot forming shall not be undertaken.
NOTE The products ordered and supplied in the thermomechanical rolled condition are not suitable for hot forming.
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7.4.2.2 Cold formability
7.4.2.2.1 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.
7.4.2.2.2 Flangeability
If specified at the time of the order plate, sheet, strip and wide flats ordered and supplied in the thermomechanical
rolled condition with a nominal thickness ≤ 12 mm shall be suitable for flanging without cracking with the following
minimum bend radii:
− 2 times the nominal thickness with the axis of the bend in transverse direction and 2,5 times the nominal
thickness in longitudinal direction for the steel grades S275 and S355;
− 4 times the nominal thickness with the axis of the bend in transverse direction and 5 times the nominal
thickness in longitudinal direction for the steel grades S420, S460 and S500.
See option 11b.
7.4.2.2.3 Roll forming
If specified at the time of the order plate, sheet and strip with a nominal thickness ≤ 8 mm shall be suitable for the
production of sections by cold rolling (for example according to EN 10162), with the same minimum bend radii as
given in 7.4.2.2.2.
See option 12.
NOTE The products suitable for roll forming are also suitable for the manufacture of cold-finished square and rectangular
hollow sections.
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 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 with 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 7.2.5).
See option 5.
NOTE 2 In some cases steels above S460 may be sensitive to cracking during galvanizing and therefore special care
should be taken.
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oSIST prEN 10025-4:2014
prEN 10025-4:2014 (E)
7.5 Surface properties
7.5.1 Strip
The surface condition should not impair an application appropriate to the steel grade if adequate processing of the
strip is applied.
7.5.2 Plates and wide flats
EN 10163 parts 1 and 2 shall apply for the permissible surface discontinuities and for the repair of surface defects
by grinding. Class A, subclass 1 of EN 10163-2 shall apply, class B regarding grinding or subclasses 2 or 3
regarding repair by welding can be agreed at the time of the order.
See option 15.
7.5.3 Sections
EN 10163 parts 1 and 3 shall apply for the permissible surface discontinuities and for the repair of surface defects
by grinding. Class C, subclass 1 of EN 10163-3 shall apply, class D regarding grinding or subclasses 2 or 3
regarding repair by welding can be agreed at the time of the order.
See option 16.
7.5.4 Bars and rods
EN 10221 applies for the permissible surface discontinuities and for the repair of surface defects by grinding.
Class A of EN 10221 shall apply, unless otherwise agreed at the time of the order.
See option 17.
7.6 Internal soundness
Ultrasonic testing may be agreed at the time of the order and shall comply with 10.3.
See option 6 (for flat products).
See option 7 (for H beams with parallel flanges and IPE beams).
See option 8 (for bars).
7.7 Dimensions, tolerances on dimensions and shape, mass
7.7.1 Dimensions, tolerances on dimensions and shape shall be in accordance with the requirements given in
the order by reference to the relevant documents according to 2.2 and according to prEN 10025-1:2014, 2.2 and
4.2.
For hot rolled plate tolerances the basic requirements shall be in accordance with EN 10029, including thickness
tolerances to class A, unless otherwise agreed at the time of the order.
See option 18.
For plates cut from continuously hot rolled strip, the thickness tolerances shall be in accordance with EN 10051.
7.7.2 The nominal mass shall be determined from the nominal dimensions using a volumetric mass of
7 850 kg/m³.
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oSIST prEN 10025-4:201
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