ISO-630-4 › Structural steels - Part 4: Technical delivery conditions for high yield strength quenched and tempered structural steel plates and wide flats
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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. GradesÂ S460Q, S500Q, S550Q, S620Q, S690Q, S890Q and S960Q are covered in AnnexÂ A. GradesÂ SG460Q, SG500Q, and SG700Q are covered in AnnexÂ 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 3Â mm and a maximum nominal thickness of 200Â mm for grades S460Q, S500Q, S550Q, S620Q and S690Q, a maximum nominal thickness of 125Â mm for grades S890Q and S960Q, a maximum nominal thickness of 100Â mm for grades SG460Q and SG500Q and a maximum nominal thickness of 150Â mm for grade SG700Q.
This document does not include the following structural steels, some of which are covered by other International Standards:
â..Â Â Â Sheet and stripÂ â.. refer to ISOÂ TCÂ 17/SCÂ 12, Continuous mill flat rolled products;
â..Â Â Â Tubular productsÂ â.. refer to ISOÂ TCÂ 5/SCÂ 1, Steel tubes.
NOTEÂ 1Â Â Â Lists of standards covered by ISO/TCÂ 17/SCÂ 12 and ISO/TCÂ 5/SCÂ 1 are available on the ISO website.
NOTEÂ 2Â Â Â In all parts of ISO 630, the term of "thickness" is considered as "nominal thickness", unless otherwise stated.
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April 1, 2021
ISO/TC 17/SC 3