ISO 630-2:2021

Structural steels - Part 2: Technical delivery conditions for structural steels for general purposes

This document specifies qualities for steels for general structural use. This document applies to steel plates rolled on a reversing mill, wide flats, hot-rolled sections and bars, which are used in the as-delivered condition and normally intended for welded or bolted structures. This document covers 8 steel grades and 4 qualities. Grades S235, S275, S355, and S460 are covered in Annex A. Grades SG205, SG250, SG285 and SG345 are covered in Annex B. Not all grades are available in all qualities, and some qualities have Charpy V‑notch requirements. The steels specified in this document are applicable to hot-rolled flat products and sections with: - thicknesses ≥ 3 mm and ≤ 150 mm for long products of steel grade S460 all qualities; - thicknesses ≥ 3 mm and ≤ 250 mm for long products or ≤ 400 mm for flat products of all other grades and qualities; and no restriction on nominal thickness for grades SG205, SG250, SG285, and SG345 for flat products, sections and long products. 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 2: Conditions techniques de livraison pour aciers de construction métallique d'usage général

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

• Consolidated By: ISO 6076:2023 - Adhesives - Installation of floor coverings, wood flooring, levelling compounds and tiles - Specification of trowel notch sizes
• Effective Date: 06-Jun-2022
• Revises: ISO 630-2:2011 - Structural steels - Part 2: Technical delivery conditions for structural steels for general purposes
• Effective Date: 27-May-2017

Overview

ISO 630-2:2021 - "Structural steels - Part 2: Technical delivery conditions for structural steels for general purposes" defines delivery requirements for common hot‑rolled structural steels used in welded or bolted constructions. The standard covers plates (reversing mill), wide flats, hot‑rolled sections and bars in the as‑delivered condition, specifying grades, qualities, required tests and acceptance criteria. It is part of the ISO 630 series and is intended to harmonize chemical, mechanical and inspection rules for general structural steels.

Key topics and requirements

• Covered steel grades: Eight grades are standardized. Annex A covers S235, S275, S355 and S460; Annex B covers SG205, SG250, SG285 and SG345. Each annex is normative and applied separately.
• Qualities and impact testing: Four qualities (A, B, C, D):
  • Quality A - no impact testing
  • Quality B - Charpy V‑notch at +20 °C
  • Quality C - Charpy V‑notch at 0 °C
  • Quality D - Charpy V‑notch at −20 °C
    Default specimen orientation is longitudinal unless transverse orientation is agreed.
• Forms and thickness limits: Applies to hot‑rolled flat products and sections with specific nominal thickness ranges:
  • S460 long products: 3 mm ≤ t ≤ 150 mm
  • Other grades: long products 3 mm ≤ t ≤ 250 mm; flat products ≤ 400 mm
  • SG‑grades: no nominal thickness restriction for flat products, sections and long products.
• Chemical and mechanical controls: Requires heat and/or product analysis, tensile property verification, Charpy V‑notch impact testing where applicable, and a maximum carbon‑equivalent value for Annex A grades. Steels shall be killed (non‑rimming).
• Delivery condition and marking: Products may be supplied as‑rolled, normalized rolled, normalized, or thermomechanically processed. Delivery condition and inspection documentation must be specified.
• Sampling and test units: Typical test unit sizes specified (e.g., Annex A: 60 t per heat or part thereof; 80 t for heavy sections or large heats; Annex B: 50 t per heat). Inspection, sampling frequency and test methods reference ISO 630‑1.

Applications and users

ISO 630-2 is used by:

• Steel producers and mill operators for production and certification of hot‑rolled structural steels
• Structural engineers and fabricators specifying material for buildings, bridges, cranes and general welded/bolted structures
• Procurement and quality inspectors enforcing delivery conditions, tests and marking
• Third‑party testing and certification bodies

Practical applications include specifying appropriate grades and impact qualities for load‑bearing members, ensuring weldability and toughness, and setting inspection/test regimes for material acceptance.

Related standards

• ISO 630‑1 - General technical delivery conditions for hot‑rolled products (normative reference)
• ISO TC 17/SC 12 - continuous mill flat rolled products (sheet and strip)
• ISO TC 5/SC 1 - steel tubes (tubular products)

Keywords: ISO 630-2, structural steels, technical delivery conditions, hot‑rolled, S235 S275 S355 S460, SG205 SG250 SG285 SG345, Charpy V‑notch, tensile properties, chemical composition, welded structures.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 630-2
Third edition
2021-04
Structural steels —
Part 2:
Technical delivery conditions for
structural steels for general purposes
Aciers de construction —
Partie 2: Conditions techniques de livraison pour aciers de
construction métallique d'usage général
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]
Email: [e-mail]
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 . 1
4 Classification and designation . 2
4.1 Classification . 2
4.2 Designation (grades and qualities) . 2
4.3 Normative Annexes . 2
5 Information to be supplied by the purchaser. 2
5.1 Mandatory information . 2
5.2 Options . 2
6 Requirements . 2
6.1 Steelmaking process . 2
6.2 Delivery condition . 2
6.3 Chemical composition . 3
6.3.1 Heat analysis . . 3
6.3.2 Product analysis . 3
6.3.3 Carbon equivalent value . 3
6.4 Mechanical properties . 3
6.4.1 Tensile properties . 3
6.4.2 Charpy V-notch impact properties . 3
6.5 Surface condition . 3
6.6 Internal soundness . 3
6.7 Dimensions, tolerances on dimensions and shape, mass. 3
7 Inspection . 3
8 Sampling - Frequency of testing . 3
8.1 Verification . 3
8.2 Test units . 4
8.2.1 Annex A . 4
8.2.2 Annex B . 4
9 Test methods . 4
10 Marking . 4
Annex A (normative) Steel grades S235, S275, S355 and S460: Chemical composition and
mechanical properties . 5
Annex B (normative) Steel grades SG205, SG250, SG285 and SG345: Chemical composition
and mechanical properties .11
Bibliography .15
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
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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
construction purposes.
This third edition cancels and replaces the second edition (ISO 630-2:2011), which has been technically
revised. The main changes compared to the previous edition are as follows:
— applicable thickness ranges have been added in the Scope;
— additional terms and definitions concerning heat treatments have been deleted because ISO 4885 is
in normative references of ISO 630-1;
— list of options has been integrated in ISO 630-1;
— test units have been updated;
— in Tables, the designation concerning thickness have been changed into “nominal thickness”;
— 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 630-2:2021(E)
Structural steels —
Part 2:
Technical delivery conditions for structural steels for
general purposes
1 Scope
This document specifies qualities for steels for general structural use. This document applies to steel
plates rolled on a reversing mill, wide flats, hot-rolled sections and bars, which are used in the as-
delivered condition and normally intended for welded or bolted structures.
This document covers 8 steel grades and 4 qualities. Grades S235, S275, S355, and S460 are covered in
Annex A. Grades SG205, SG250, SG285 and SG345 are covered in Annex B. Not all grades are available in
all qualities, and some qualities have Charpy V-notch requirements.
The steels specified in this document are applicable to hot-rolled flat products and sections with:
— thicknesses ≥ 3 mm and ≤ 150 mm for long products of steel grade S460 all qualities;
— thicknesses ≥ 3 mm and ≤ 250 mm for long products or ≤ 400 mm for flat products of all other
grades and qualities;
and no restriction on nominal thickness for grades SG205, SG250, SG285, and SG345 for flat products,
sections and long products.
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 630-1, Structural steels — Part 1: General technical delivery conditions for hot-rolled products
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 630-1 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 steel grades specified in this document shall be classified as unalloyed or alloy steels.
4.2 Designation (grades and qualities)
This document specifies 8 steel grades. Grades S235, S275, S355, and S460 are covered in Annex A.
Grades SG205, SG250, SG285, and SG345 are covered in Annex B. Each grade is available in up to 4
qualities. These grades and qualities differ in their specified mechanical properties and impact energy
requirements.
— Quality A: no impact testing.
— Quality B: impact testing at 20 °C.
— Quality C: impact testing at 0 °C.
— Quality D: impact testing at −20 °C.
4.3 Normative Annexes
The requirements of Annex A or Annex B are to be regarded separately. Each is independent of the
other without combining in any way.
5 Information to be supplied by the purchaser
5.1 Mandatory information
The information that shall be supplied by the purchaser at the time of the order is specified in ISO 630-1.
5.2 Options
The options of ISO 630-1 may apply. 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).
6 Requirements
6.1 Steelmaking process
See ISO 630-1.
If a special steelmaking process has been specified, this shall be reported in the inspection document.
The steels shall be killed (non-rimming).
6.2 Delivery condition
At the manufacturer's discretion, the products covered by this document shall be delivered in the as-
rolled condition, normalized rolled, normalized or thermomechanical processed condition. The delivery
condition shall be indicated in the inspection document.
2 © ISO 2021 – All rights reserved

6.3 Chemical composition
6.3.1 Heat analysis
The ch
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