ISO/FDIS 630-4

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 630-4
ISO/TC 17/SC 3
Structural steels —
Secretariat: AFNOR
Voting begins on:
Part 4:
2020-12-29
Technical delivery conditions for
Voting terminates on:
high-yield-strength quenched and
2021-02-23
tempered structural steel plates
Aciers de construction —
Partie 4: Conditions techniques de livraison pour tôles en acier de
construction trempé et revenu à haute limite d'élasticité
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 630-4:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
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ISO/FDIS 630-4:2020(E)
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© ISO 2020

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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

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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

This document was prepared by Technical Committee ISO/TC 17, Steels, Subcommittee SC 3, Steels for

This second edition cancels and replaces the first edition (ISO 630‑4:2012), which has been technically

— additional terms and definitions concerning heat treatments have been deleted because ISO 4885 is

— 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

— the content of the document has been updated to harmonize with all parts of ISO 630.

Any feedback or questions on this document should be directed to the user’s national standards body. A

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

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

This document does not include the following structural steels, some of which are covered by other

— Sheet and strip — refer to ISO TC 17/SC 12, Continuous mill flat rolled products;

NOTE 1 Lists of standards covered by ISO/TC 17/SC 12 and ISO/TC 5/SC 1 are available on the ISO Web site.

NOTE 2 In all parts of ISO 630, the term of "thickness" is considered as "nominal thickness", unless

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

For the purposes of this document, the terms and definitions given in ISO 630‑1 and the following apply.