ISO 630-1:2021

Structural steels - Part 1: General technical delivery conditions for hot-rolled products

This document specifies the general technical delivery conditions for steel flat and long products (plates/ sections/wide flats and bars) used principally for general-purpose structural steels. The steels specified in this document are intended for use in welded or bolted structures. The specific requirements for structural steels are given in the individual parts of ISO 630. This document does not include the following structural steels, some of which are covered by other International Standards: - sheet and strip: refer to ISO TC 17/SC 12 “Continuous mill flat rolled products”; - tubular products: refer to ISO TC 5/SC 1 “Steel tubes”. NOTE 1 Lists of standards covered by ISO/TC 17/SC 12 and ISO/TC 5/SC 1 are available on the ISO website. NOTE 2 In all parts of ISO 630, the term of "thickness" is considered as "nominal thickness", unless otherwise stated.

Aciers de construction — Partie 1: Conditions générales techniques de livraison pour les produits laminés à chaud

General Information

• Status: Published
• Publication Date: 19-Apr-2021
• ICS: 77.140.01 - Iron and steel products in general
• Technical Committee: ISO/TC 17/SC 3 - Steels for structural purposes
• Drafting Committee: ISO/TC 17/SC 3 - Steels for structural purposes
• Current Stage: 6060 - International Standard published
• Start Date: 20-Apr-2021
• Due Date: 27-Apr-2021
• Completion Date: 20-Apr-2021

Relations

• Revises: ISO 630-1:2011 - Structural steels - Part 1: General technical delivery conditions for hot-rolled products
• Effective Date: 27-May-2017

Overview

ISO 630-1:2021 - Structural steels - Part 1: General technical delivery conditions for hot-rolled products defines the general technical delivery conditions for hot‑rolled steel flat and long products (plates, sections, wide flats and bars) intended mainly for general-purpose structural steels used in welded or bolted structures. It sets out the purchaser/producer information, testing and inspection framework, and basic requirements that harmonize how structural steel is specified, supplied and verified. Note: sheet/strip and tubular products are excluded (covered by other ISO technical committees).

Key topics and requirements

• Scope & classification
  • Applies to plates, sections, wide flats and bars; grades designated in the ISO 630 series; thickness is treated as nominal thickness unless stated otherwise.
• Information to be supplied by purchaser
  • Mandatory items: quantity, product type, nominal dimensions and tolerances, ISO 630 part number, steel grade/name, options and inspection document required.
• Chemical composition
  • Heat and product analysis requirements and carbon equivalent considerations for weldability (options may be agreed).
• Mechanical properties
  • Tensile properties (ISO 6892-1 referenced), impact energy/Charpy V‑notch requirements at specified temperatures (quality A–L), and through‑thickness characteristics.
• Surface condition & dimensional tolerances
  • Surface finish delivery requirements and tolerances on dimensions, shape and mass are defined or referenced (e.g., ISO 7788, ISO 9034).
• Inspection, sampling and testing
  • Types of inspection documents (ISO 10474), sampling frequency, preparation of test pieces (ISO 377/14284), and test methods (Charpy - ISO 148‑1, tensile - ISO 6892‑1, ultrasonic - ISO 17577).
• Marking and documentation
  • Requirements for marking and issuance of inspection/test certificates on delivery.

Applications and practical value

• Ensures consistent specification and traceability of hot‑rolled structural steels for:
  • Structural steel fabricators and welding contractors
  • Steel producers and rolling mills
  • Construction engineers and specifiers preparing procurement documents
  • Quality assurance and testing laboratories performing tensile, impact, ultrasonic and chemical analyses
  • Procurement teams requiring standardized inspection certificates
• Using ISO 630-1 improves interoperability between suppliers and buyers, streamlines conformity checks, and reduces disputes over material properties, surface condition, and testing.

Related standards

• ISO 630 series (Parts 2–6) for specific structural steel grades and conditions
• Test and inspection standards referenced: ISO 148‑1, ISO 6892‑1, ISO 17577, ISO 10474, ISO 7788, ISO 9034

Keywords: ISO 630-1, structural steels, hot-rolled products, technical delivery conditions, steel flat and long products, welded structures, nominal thickness, inspection, mechanical properties.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 630-1
Second edition
2021-04
Structural steels —
Part 1:
General technical delivery conditions
for hot-rolled products
Aciers de construction —
Partie 1: Conditions générales techniques de livraison pour les
produits laminés à chaud
Reference number
©
ISO 2021
© ISO 2021
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]
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Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification and designation . 2
4.1 Classification . 2
4.2 Designation . 2
5 Information to be supplied by the purchaser. 3
5.1 Mandatory information . 3
5.2 Options . 3
6 Requirements . 4
6.1 Steelmaking process . 4
6.2 Delivery condition . 4
6.3 Chemical composition . 4
6.3.1 Heat analysis . . 4
6.3.2 Product analysis . 4
6.3.3 Carbon equivalent value . 4
6.4 Mechanical properties . 4
6.4.1 General. 4
6.4.2 Tensile properties . 5
6.4.3 Charpy V-notch impact properties . 5
6.4.4 Through-thickness properties . 5
6.5 Surface condition . 5
6.6 Internal soundness . 5
6.7 Dimensions, tolerances on dimensions and shape, and mass . 5
6.7.1 Dimensions, tolerances on dimensions and shape . 5
6.7.2 Calculation of mass . 5
7 Inspection . 5
7.1 Types of inspection and inspection documents . 5
7.2 Tests to be carried out . 6
7.3 Retests . 6
8 Sampling . 6
8.1 General . 6
8.2 Frequency of testing . 6
8.2.1 Verification of chemical composition . 6
8.2.2 Verification of mechanical properties . 6
8.2.3 Tests to be carried out for specific inspection . 6
8.3 Selection and preparation of samples and test pieces . 7
8.3.1 Sampling and sample preparation. 7
8.3.2 Preparation of samples and test pieces. 7
9 Test methods . 7
9.1 Chemical analysis . 7
9.2 Tensile test . 8
9.3 Impact test . 8
9.4 Through-thickness characteristics test . 8
9.5 Ultrasonic test . 8
10 Marking . 8
Annex A (informative) Applicable standards on dimensions, tolerances, shape and mass .10
Bibliography .11
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steels, Subcommittee SC 3, Steels for
structural purposes.
This second edition cancels and replaces the first edition (ISO 630-1:2011), which has been technically
revised. The main changes compared to the previous edition are as follows:
― List of normative references has been updated.
― In Tables, the designations concerning thickness have been changed to “nominal thickness”.
― ISO 657-16 has been deleted from Clause 2 and the text in 6.7.1.
― Terms and definitions of “non-specific inspection” and “specific inspection” have been deleted,
because ISO 404 and ISO 10474 have been added in Clause 2.
― Designation of qualities has been added.
― List of options has been updated.
― Content of Table A.1 has been updated.
― The bibliography has been updated.
― The content of the document has been updated to harmonize with all parts of ISO 630.
A list of all parts in the ISO 630 series can be found on the ISO website.
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.
iv © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 630-1:2021(E)
Structural steels —
Part 1:
General technical delivery conditions for hot-rolled
products
1 Scope
This document specifies the general technical delivery conditions for steel flat and long products
(plates/ sections/wide flats and bars) used principally for general-purpose structural steels. The steels
specified in this document are intended for use in welded or bolted structures.
The specific requirements for structural steels are given in the individual parts of ISO 630.
This document does not include the following structural steels, some of which are covered by other
International Standards:
— sheet and strip: refer to ISO TC 17/SC 12 “Continuous mill flat rolled products”;
— tubular products: refer to ISO TC 5/SC 1 “Steel tubes”.
NOTE 1 Lists of standards covered by ISO/TC 17/SC 12 and ISO/TC 5/SC 1 are available on the ISO website.
NOTE 2 In all parts of ISO 630, the term of "thickness" is considered as "nominal thickness", unless
otherwise stated.
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
ISO 404, Steel and steel products — General technical delivery requirements
ISO 630-2, Structural steels — Part 2: Technical delivery conditions for structural steels for general
purposes
ISO 630-3, Structural steels — Part 3: Technical delivery conditions for fine-grain structural steels
ISO 630-4, Structural steels — Part 4: Technical delivery conditions for high yield strength quenched and
tempered structural steel plates
ISO 630-5, Structural steels — Part 5: Technical delivery conditions for structural steels with improved
atmospheric corrosion resistance
ISO 630-6, Structural steels — Part 6: Technical delivery conditions for seismic-improved structural steels
for building
ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
ISO 4885, Ferrous materials — Heat treatments — Vocabulary
ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based
on chemical composition
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main
quality classes and main property or application characteristics
ISO/TS 4949, Steel names based on letter symbols
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6929, Steel products — Vocabulary
ISO 7778, Through-thickness characteristics for steel products
ISO 7788, Steel — Surface finish of hot-rolled plates and wide flats — Delivery requirements
ISO 9034, Hot-rolled structural steel wide flats — Tolerances on dimensions and shape
ISO 9443, Surface quality classes for hot-rolled bars and wire rod
ISO/TS 9769, Steel and iron — Review of available methods of analysis
ISO 10474, Steel and steel products — Inspection documents
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
ISO 17577, Steel — Ultrasonic testing of steel flat products of thickness equal to or greater than 6 mm
ISO 20723, Structural steels — Surface condition of hot-rolled sections — Delivery requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 404, ISO 4885, ISO 4948-1,
ISO 4948-2, ISO 6929 and ISO 10474 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Classification and designation
4.1 Classification
The classification of the steel grades in accordance with ISO 4948-1 and ISO 4948-2 is given in the
individual parts of ISO 630, depending on the steel grade chemical composition and treatment condition.
4.2 Designation
The steel grades specified in the individual parts of ISO 630 are designated with steel names in
accordance with ISO/TS 4949.
Qualities differ in their impact energy requirements:
— Quality A : no impact testing
— Quality B : impact testing at 20 °C
— Quality C : impact testing at 0 °C
2 © ISO 2021 – All rights reserved

— Quality D : impact testing at -20 °C
— Quality E : impact testing at – 40 °C
— Quality L : impact testing at - 50 °C
— Quality F : impact testing at – 60 °C
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 enquiry and order:
a) the quantity required;
b) the type of product;
c) the nominal dimensions and tolerances on dimensions and shape of the product;
d) the number of the relevant part of ISO 630;
e) the steel name (grade) or designation;
f) all required options (see 5.2);
g) inspection document to be issued (see 7.1).
5.2 Options
A number of options for agreement between the manufacturer and purchaser are specified in this
document and listed below. If the purchaser does not specify any of these options at the time of enquiry
and order, the products shall be supplied in accordance with the basic specification (see 5.1):
a) specification of the steelmaking process (see 6.1);
b) required delivery condition (see 6.2), applicable for ISO 630-2 and ISO 630-5;
c) product analysis (see 6.3.2);
d) alternative weldability formula (see 6.3.3);
e) mechanical properties after additio
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