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.

Edition	2021
Standard Part No	4
Published Date	2021
Published By	International Standardization Organisation
Page Count	14