ISO 630-4:2021

Structural steels - Part 4: Technical delivery conditions for high yield strength quenched and tempered structural steel plates and wide flats

This document specifies qualities for high-yield-strength quenched and tempered structural steels. It applies to steel plates and wide flats rolled on a reversing mill which are used in the quenched and tempered condition and normally intended for welded or bolted structures. This document covers 10 grades and 5 qualities. Grades S460Q, S500Q, S550Q, S620Q, S690Q, S890Q and S960Q are covered in Annex A. Grades SG460Q, SG500Q, and SG700Q 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 with a minimum nominal thickness of 3 mm and a maximum nominal thickness of 200 mm for grades S460Q, S500Q, S550Q, S620Q and S690Q, a maximum nominal thickness of 125 mm for grades S890Q and S960Q, a maximum nominal thickness of 100 mm for grades SG460Q and SG500Q and a maximum nominal thickness of 150 mm for grade SG700Q. 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 4: Conditions techniques de livraison pour tôles en acier de construction trempé et revenu à haute limite d'élasticité et larges-plats

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 630-4:2012 - Structural steels - Part 4: Technical delivery conditions for high-yield-strength quenched and tempered structural steel plates
• Effective Date: 27-May-2017

Overview - ISO 630-4:2021 (Structural steels, high-yield quenched & tempered)

ISO 630-4:2021 specifies technical delivery conditions for high yield strength quenched and tempered structural steel plates and wide flats. It applies to hot-rolled flat products (minimum nominal thickness 3 mm) intended for welded or bolted structures and rolled on a reversing mill. The standard covers 10 steel grades organized in two normative annexes and five impact-related qualities (A, C, D, E, F).

Key topics and technical requirements

• Grades and qualities
  • Annex A: S460Q, S500Q, S550Q, S620Q, S690Q, S890Q, S960Q.
  • Annex B: SG460Q, SG500Q, SG700Q.
  • Qualities: A (no impact test), C (0 °C), D (−20 °C), E (−40 °C), F (−60 °C).
• Thickness ranges
  • Typical max nominal thicknesses differ by grade (e.g., up to 200 mm for many Annex A grades; lower maxima for very-high-strength grades and Annex B grades). (See standard for exact limits by grade.)
• Delivery condition
  • Products are supplied in the quenched and tempered condition; steels are fully killed, fine-grain and contain sufficient nitrogen-binding elements.
• Chemical composition and carbon equivalent
  • Heat and product analysis requirements are specified in the annexes; maximum Carbon Equivalent Value (CEV) limits are required (CEV formula and details referenced in ISO 630-1).
• Mechanical properties
  • Tensile properties at room temperature and Charpy V‑notch impact requirements (orientation predominantly longitudinal; transverse by agreement) are defined per grade/quality.
• Inspection, testing and sampling
  • Verification is by heat. Annex A test unit: by heat (60 tonnes or part thereof). Annex B: test unit per plate/wide flat as heat treated.
• Marking, surface condition, dimensions
  • Referenced to ISO 630-1 for marking, surface condition, internal soundness, tolerances and test methods.

Practical applications and users

ISO 630-4 is used by:

• Steel manufacturers and mills producing quenched and tempered plates and wide flats.
• Procurement teams specifying material for bridges, heavy buildings, cranes, offshore structures and other welded/bolted steelwork where high yield strength is required.
• Structural engineers, fabricators and welders who need certified material properties (tensile, impact) and traceability for design and fabrication.
• Quality and inspection bodies for conformity assessment and batch testing.

Benefits:

• Ensures consistent mechanical performance, weldability and toughness.
• Facilitates international procurement and interchangeability of high-strength structural steels.

Related standards

• ISO 630-1 - General technical delivery conditions for hot‑rolled products (normative reference).
• ISO 4885 and other ISO/TC 17 publications for related terminology, tests and product families.

Keywords: ISO 630-4, structural steels, quenched and tempered, high yield strength, steel plates, wide flats, Charpy V-notch, tensile properties, chemical composition, delivery conditions.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 630-4
Second edition
2021-04
Structural steels —
Part 4:
Technical delivery conditions for
high yield strength quenched and
tempered structural steel plates and
wide flats
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 . 3
6.1 Steelmaking process . 3
6.2 Delivery condition . 3
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. 4
7 Inspection . 4
8 Sampling – Frequency of testing . 4
8.1 Verification . 4
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 S460Q, S500Q, S550Q, S620Q, S690Q, S890Q and S960Q:
Chemical composition and mechanical properties . 5
Annex B (normative) Steel grades SG460Q, SG500Q, and SG700Q: Chemical composition
and mechanical properties .12
Bibliography .14
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
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electrotechnical standardization.
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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
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any patent rights identified during the development of the document will be in the Introduction and/or
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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 second edition cancels and replaces the first edition (ISO 630-4:2012), which has been technically
revised. The main changes compared to the previous edition are as follows:
— modification of the title to integrate wide flats;
— integration of wide flats in the text;
— applicable thickness ranges have been added in the scope;
— extension of applicable thicknesses for S890Q and S960Q;
— addition of quality F for grade S960Q;
— 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 updated as part has been integrated in ISO 630-1;
— the formula for CEV has been deleted because given in ISO 630-1;
— test units have been updated;
— in Tables, the designation concerning thickness have been changed into “nominal thickness”;
— order of listing chemical elements has been updated for grades of Annex A in accordance with
ISO 6306;
— 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.
iv © ISO 2021 – All rights reserved

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.
INTERNATIONAL STANDARD ISO 630-4:2021(E)
Structural steels —
Part 4:
Technical delivery conditions for high yield strength
quenched and tempered structural steel plates and wide
flats
1 Scope
This document specifies qualities for high-yield-strength quenched and tempered structural steels. It
applies to steel plates and wide flats rolled on a reversing mill which are used in the quenched and
tempered condition and normally intended for welded or bolted structures.
This document covers 10 grades and 5 qualities. Grades S460Q, S500Q, S550Q, S620Q, S690Q, S890Q
and S960Q are covered in Annex A. Grades SG460Q, SG500Q, and SG700Q 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 with a minimum nominal
thickness of 3 mm and a maximum nominal thickness of 200 mm for grades S460Q, S500Q, S550Q,
S620Q and S690Q, a maximum nominal thickness of 125 mm for grades S890Q and S960Q, a maximum
nominal thickness of 100 mm for grades SG460Q and SG500Q and a maximum nominal thickness of
150 mm for grade SG700Q.
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 and the following 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:// w
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