ISO 630-6:2023

Structural steels - Part 6: Technical delivery conditions for seismic-proof improved structural steels for building

This document specifies qualities for steels for seismic-proof improved structural use. It is applicable to steel plates rolled on a reversing mill, wide flats, hot-rolled sections, which are used in the as-rolled condition, with the exception of grade SA440, which is normally produced using quenched and tempered or thermomechanical controlled process and normally intended for welded or bolted structures. This document covers 5 steel grades and 7 qualities. Grades SA235, SA325, SA345, SA390 and SA440 are covered. 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 plates, wide flats, and sections with a minimum nominal thickness of 6 mm and a maximum nominal thickness of 150 mm for steel plates, and a maximum nominal thickness of 140 mm for wide flats and hot-rolled sections. This document does not include the following structural steels, some of which are covered by other International Standards: - sheet and strip, e.g. ISO 4995 or ISO 4996; - tubular products. e.g. ISO 12633-1, ISO 12633-2. NOTE The term "thickness" is considered as "nominal thickness", unless otherwise stated.

Aciers de construction — Partie 6: Conditions techniques de livraison pour aciers de construction améliorés sismiques pour bâtiment

General Information

• Status: Published
• Publication Date: 07-Nov-2023
• ICS: 77.140.70 - Steel profiles
• ICS: 91.120.25 - Seismic and vibration protection
• 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: 08-Nov-2023
• Due Date: 25-Jun-2024
• Completion Date: 08-Nov-2023

Relations

• Revises: ISO 630-6:2014 - Structural steels - Part 6: Technical delivery conditions for seismic-improved structural steels for building
• Effective Date: 06-Jun-2022

Overview

ISO 630-6:2023 - "Structural steels - Part 6: Technical delivery conditions for seismic-proof improved structural steels for building" defines delivery conditions, chemical and mechanical requirements, and testing for steels intended for seismic-proof structural use. It applies to hot-rolled plates, wide flats and hot-rolled sections (as-rolled unless otherwise agreed), covering five steel grades (SA235, SA325, SA345, SA390, SA440) and up to seven qualities. The standard targets members of the construction supply chain who need consistent, verifiable material performance in seismic regions.

Key topics and technical requirements

• Grades and qualities: SA235, SA325, SA345, SA390 and SA440 are specified. Qualities A, C, C+, D, D+, E and E+ define different impact-testing regimes (e.g., 0 °C, −20 °C, −40 °C) and whether through‑thickness testing is required.
• Product scope and dimensions: Applicable to hot‑rolled plates (nominal thickness 6–150 mm) and wide flats/hot‑rolled sections (nominal thickness up to 140 mm). Sheet, strip and tubular products are excluded.
• Delivery condition: Generally delivered as‑rolled; SA440 is normally quenched & tempered or produced by thermomechanical controlled process (TMCP). TMCP may be applied if agreed between purchaser and manufacturer.
• Chemical composition & product analysis: Heat analysis limits are specified per grade; permitted deviations for product analysis (e.g., C +0.03 %, Si +0.05 %, Mn ±0.10 %, P +0.005 %, S +0.005 %) are defined.
• Carbon equivalent (CEV): CEV requirements are given by grade and thickness; CEV is calculated using the IIW formula to assess weldability and crack susceptibility.
• Mechanical testing: Tensile properties, Charpy V‑notch impact testing (transverse direction optional), and through‑thickness characteristics testing (for “+” qualities) are required. Sampling frequency, inspection and test methods are specified.
• Marking, tolerances and inspection: Requirements cover marking, dimensional tolerances, internal soundness and sampling procedures.

Practical applications

• Ensures consistent material performance for seismic-resistant buildings and structural components.
• Guides steel producers on delivery specifications and allowable chemistries.
• Provides fabricators, structural engineers and procurement teams with objective criteria for material selection, testing and acceptance.
• Used by certification bodies and regulators to verify compliance in seismic design contexts.

Who should use this standard

• Steel mills and manufacturers of plates, wide flats and hot-rolled sections
• Structural engineers, design offices and fabricators working on seismic-prone buildings
• Procurement, quality assurance and testing laboratories verifying material conformity

Related standards

• ISO 630-1 (general technical delivery conditions)
• ISO 7452 (plate tolerances)
• ISO 9034 (wide flats tolerances)
• ISO 7778 (through-thickness characteristics)

Keywords: ISO 630-6, structural steels, seismic-proof, technical delivery conditions, SA235, SA325, SA345, SA390, SA440, Charpy V‑notch, carbon equivalent (CEV), thermomechanical controlled process, hot‑rolled plates.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 630-6
Second edition
2023-11
Structural steels —
Part 6:
Technical delivery conditions for
seismic-proof improved structural
steels for building
Aciers de construction —
Partie 6: Conditions techniques de livraison pour aciers de
construction améliorés sismiques pour bâtiment
Reference number
© ISO 2023
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
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
5 Information to be supplied by purchaser . 2
5.1 Mandatory information . 2
5.2 Options. 2
6 Requirements . 2
6.1 Steel-making process . 2
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 (CEV) or parameter crack measurement (P ). 4
CM
6.3.4 Carbon equivalent value (CEV) or parameter crack measurement (P ) for
CM
steel products by thermomechanical controlled process. 5
6.4 Mechanical properties . 6
6.4.1 Tensile properties . . 6
6.4.2 Charpy V-notch impacts test . 6
6.4.3 Through thickness characteristics . 6
6.5 Surface conditions . 7
6.6 Internal soundness . 7
6.7 Dimensions, tolerances on dimensions and shape, mass. 8
7 Inspection . 9
8 Sampling — Frequency of testing .9
8.1 Verification . . 9
8.2 Test units . 9
8.2.1 Tensile tests . 9
8.2.2 Impact tests . 9
8.2.3 Through-thickness characteristics test . 10
9 Test methods .10
10 Marking . .10
Annex A (normative) Shapes and dimensions tolerances of H-sections .11
Annex B (informative) The formula of carbon equivalent and the maximum carbon
equivalent value .15
Bibliography .17
iii
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 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
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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 4, Steels for
structural purposes.
This second edition cancels and replaces the first edition (ISO 630-6:2014), which has been technically
revised.
The main changes are as follows:
— steel grades and qualities have been updated in the scope with the addition of a new grade (SA390)
and four qualities (D, D+, E and E+);
― the maximum nominal thickness for plate has been changed from 125 mm to 150 mm;
― the specification of delivery conditions has been added to the scope to align with other parts of the
ISO 630 series;
― the list of normative references has been updated;
― some terms and definitions concerning heat treatments have been deleted because they are already
included in 630-1;
― four qualities (D, D+, E and E+) have been added to 4.2;
― in the tables, the designations concerning thickness have been changed to “nominal thickness”;
― specified values for SA390 have been added to Tables 1, 3, 4, 5, 6, 7 and 8;
― four new qualities (D, D+, E and E+) have been added to Table 8
― the layout of Table 3, 4, 5, 6, B.1, and B.2 has been updated.
iv
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.
v
INTERNATIONAL STANDARD ISO 630-6:2023(E)
Structural steels —
Part 6:
Technical delivery conditions for seismic-proof improved
structural steels for building
1 Scope
This document specifies qualities for steels for seismic-proof improved structural use. It is applicable
to steel plates rolled on a reversing mill, wide flats, hot-rolled sections, which are used in the as-rolled
condition, with the exception of grade SA440, which is normally produced using quenched and tempered
or thermomechanical controlled process and normally intended for welded or bolted structures.
This document covers 5 steel grades and 7 qualities. Grades SA235, SA325, SA345, SA390 and SA440
are covered. 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 plates, wide flats, and sections with
a minimum nominal thickness of 6 mm and a maximum nominal thickness of 150 mm for steel plates,
and a maximum nominal thickness of 140 mm for wide flats and hot-rolled sections.
This document does not include the following structural steels, some of which are covered by other
International Standards:
— sheet and strip, e.g. ISO 4995 or ISO 4996;
— tubular products. e.g. ISO 12633-1, ISO 12633-2.
NOTE The term "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
ISO 7452, Hot-rolled steel plates — Tolerances on dimensions and shape
ISO 9034, Hot-rolled structural steel wide flats — Tolerances on dimensions and shape
ISO 7778, Through-thickness characteristics for steel 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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// 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 5 steel grades— Grades SA235, SA325, SA345, SA390 and SA440. Each grade
is available in up to 7 qualities.
— Quality A: no impact testing.
— Quality C: impact testing at 0 °C.
— Quality C+: impact testing at 0 °C and through-thickness characteristics testing.
— Quality D: impact testing at –20 °C.
— Quality D+: impact testing at –20 °C and through-thickness characteristics testing.
— Quality E: impact testing at –40 °C.
— Quality E+: impact testing at –40 °C and through-thickness characteristics testing.
5 Information to be supplied by 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. In addition, the following options may apply.
a) Testing of impact properties in the transverse direction using Charpy V-notch test pieces in
accordance with ISO 630-1.
b) Testing of tensile and impact properties at a frequency per each plate as heat-treated.
c) On special request of the purchaser, the manufacturer may 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 and reported in the heat analysis.
d) On special request of the purchaser, the manufacturer may 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 and reported in the product analysis. The product analysis
may be carried out at an agreed frequency when specified at the time of the order.
6 Requirements
6.1 Steel-making process
The steel making process shall be in accordance with ISO 630-1.
6.2 Delivery condition
The products covered by this document are generally delivered in the as-rolled condition, with
the exception of grade SA440 which is normally produced using quenched and tempered or a
thermomechanical controlled process. For all other grades, unless otherwise agreed, the as-
rolled condition, normalized rolled, normalized or quenched and tempered condition are allowed
at the manufacturer's discretion. The thermomechanical controlled process is not allowed at the
manufacturer's discretion.
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