ISO/PRF 4997

Cold-reduced carbon steel sheet of structural quality

ISO 4997:2015 applies to cold-reduced carbon steel sheet of structural quality in grades CR220, CR250, CR320, and CH550, usually without the use of microalloying elements. The product is intended for structures that include bolting, riveting, and welding. It is generally used in the delivered condition for fabricating purposes, such as bending, forming, and welding. ISO 4997:2015 does not cover steels designated as commercial quality or drawing qualities (covered in ISO 3574), cold-reduced carbon steel sheet according to hardness requirements (covered in ISO 5954), cold-reduced steel sheet of higher strength with improved formability (covered in ISO 13887), or cold-reduced steel sheet of high tensile strength and low yield point with improved formability (covered in ISO 14590).

Tôles en acier au carbone laminées à froid, de qualité destinée à la construction

General Information

• Status: Not Published
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Drafting Committee: ISO/TC 17/SC 12 - Continuous mill flat rolled products
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Due Date: 12-Feb-2025
• Completion Date: 12-Feb-2025

Relations

• Revises: ISO 4997:2015 - Cold-reduced carbon steel sheet of structural quality
• Effective Date: 18-Mar-2023

Standards Content (Sample)

International
Standard
ISO 4997
Sixth edition
Cold-reduced carbon steel sheet of
structural quality
Tôles en acier au carbone laminées à froid, de qualité destinée à
la construction
PROOF/ÉPREUVE
Reference number
ISO 4997:2025(en) © ISO 2025
ISO 4997:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
ISO 4997:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions . 2
5 Conditions of manufacture . 2
5.1 Steelmaking .2
5.2 Chemical composition .2
5.3 Chemical analysis .3
5.3.1 Heat analysis .3
5.3.2 Product analysis .3
5.4 Weldability .3
5.5 Application .4
5.6 Mechanical properties .4
5.7 Surface quality .4
5.7.1 General .4
5.7.2 Surface quality A (unexposed) .4
5.7.3 Surface quality B (exposed) . .4
5.8 Surface finish .5
5.9 Suitability for surface coating .5
5.10 Oiling .5
6 Dimensional and shape tolerances. 5
7 Tensile-test sampling . 5
8 Tensile test . 5
9 Retests . 6
9.1 Machining and flaws . .6
9.2 Elongation .6
9.3 Additional tests .6
10 Resubmission. 6
11 Workmanship . 6
12 Inspection and acceptance . 6
13 Coil size . 7
14 Marking . . 7
15 Information to be supplied by the purchaser . 7
Bibliography . 8
PROOF/ÉPREUVE
iii
ISO 4997:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill
flat rolled products.
This sixth edition cancels and replaces the fifth edition (ISO 4997:2015), which has been technically revised.
The main changes are as follows:
— Clause 1, 3.2, 5.2, 5.6: grade CR280 and pertaining requirements have been added;
— 3.4: definition of lot has been updated;
— 5.3.2: requirement of product analysis has been updated;
— 5.8.3: roughness reference values recommended have been added;
— Clause 14: requirement of marking has been updated;
— Clause 15: requirement of information to be provided by the purchaser has been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
PROOF/ÉPREUVE
iv
International Standard ISO 4997:2025(en)
Cold-reduced carbon steel sheet of structural quality
1 Scope
This document applies to cold-reduced carbon steel sheet of structural quality in grades CR220, CR250,
CR280, CR320, and CH550, usually without the use of microalloying elements. The product is intended for
structures that include bolting, riveting, and welding. It is generally used in the delivered condition for
fabricating purposes, such as bending, forming, and welding.
This document does not cover steels designated as commercial quality or drawing qualities (covered in
ISO 3574), cold-reduced carbon steel sheet according to hardness requirements (covered in ISO 5954), cold-
reduced steel sheet of higher strength with improved formability (covered in ISO 13887), or cold-reduced
steel sheet of high tensile strength and low yield point with improved formability (covered in ISO14590).
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.
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 16162, Cold-rolled steel sheet products — Dimensional and shape tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
microalloying element
niobium, vanadium, titanium, etc. added singly or in combination to obtain higher strength levels combined
with better formability, weldability, and toughness compared to non-alloyed steels produced to equivalent
strength levels
3.2
cold-reduced steel sheet
product obtained from hot-rolled descaled steel sheet by cold
reducing to the required sheet thickness followed by annealing to recrystallize the grain structure
Note 1 to entry: The annealed product is normally supplied skin-passed (see 3.3) but may be supplied annealed-last
(i.e. without a skin pass), if specified by the purchaser on his order.
Note 2 to entry: CH550 is a product which has not been annealed after reduction to the specified thickness.
3.3
skin pass
light cold rolling of the product
Note 1 to entry: The purpose of the skin passing is one or more of the following:
PROOF/ÉPREUVE
ISO 4997:2025(en)
a) to minimize the appearance of coil breaks, stretcher strains, and fluting;
b) to control the shape;
c) to obtain the required surface finish.
Note 2 to entry: Some increase in hardness and so
...

ISO/FDIS PRF 3575:xxxx(en)
ISO /TC 17/SC 12
Secretariat: JISC
Date: 2025-01-2302-11
Continuous hot-dip zinc-coated and zinc-iron alloy-coated carbon
steel sheet of commercial and drawing qualities
Tôles en acier au carbone galvanisées en continu par immersion à chaud, de qualité commerciale et pour
emboutissage
PROOF
ISO /PRF 3575:2022(E2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2022 2025 – All rights reserved
ii
ISO/FDIS PRF 3575:20242025(en)
Contents
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions. 3
5 Conditions of manufacture . 3
6 Sampling . 9
7 Test methods . 10
8 Designation system . 10
9 Retests . 12
10 Resubmission . 12
11 Workmanship . 13
12 Inspection and acceptance . 13
13 Coil size . 13
14 Marking . 13
15 Information to be supplied by the purchaser . 14
Annex A (normative) Orders requiring base-metal thickness . 15
Bibliography . 17

Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions. 3
5 Conditions of manufacture . 3
5.1 Steelmaking . 3
5.2 Chemical composition . 3
5.3 Chemical analysis . 3
5.3.1 Heat analysis . 3
5.3.2 Product analysis . 3
5.4 Mechanical properties . 4
5.4.1 Ordering conditions . 4
5.4.2 Fabrication qualities . 5
5.4.3 Interstitial free steel . 5
5.5 Coating . 6
5.5.1 Coating mass . 6
5.5.2 Coating adherence . 7
5.6 Weldability . 8
5.7 Painting . 8
5.8 Surface treatment . 8
5.8.1 Mill passivation . 8
iii
ISO /PRF 3575:2022(E2025(en)
5.8.2 Mill phosphating . 9
5.8.3 Oiling . 9
5.9 Coated coil joining . 9
5.10 Dimensional and shape tolerances . 9
6 Sampling . 9
6.1 Tensile test . 9
6.2 Coating tests . 9
6.2.1 Coating mass . 9
6.2.2 Triple-spot test . 9
6.2.3 Single-spot test. 9
6.2.4 Coating adherence . 10
7 Test methods . 10
7.1 Tensile test . 10
7.2 Coating properties . 10
7.2.1 Coating mass . 10
7.2.2 Coating adherence . 10
8 Designation system . 10
8.1 General. 10
8.2 Coating type . 10
8.3 Coating mass . 10
8.4 Coating finish condition . 11
8.5 Surface treatment . 11
8.6 Base-metal quality designation . 11
8.7 Examples . 11
9 Retests . 12
9.1 Machining and flaws . 12
9.2 Elongation . 12
9.3 Additional tests . 12
10 Resubmission . 12
11 Workmanship . 13
12 Inspection and acceptance . 13
13 Coil size . 13
14 Marking . 13
15 Information to be supplied by the purchaser . 14
Annex A (normative) Orders requiring base-metal thickness . 15
Bibliography . 17

iv © ISO 2022 2025 – All rights reserved
iv
ISO/FDIS PRF 3575:20242025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should b
...