本文件规定了高屈服强度淬火和回火结构钢的质量。它适用于在可逆式轧机上轧制的钢板和宽扁钢，用于淬火和回火条件，通常用于焊接或螺栓连接结构。 本文件涵盖10个等级和5个品质。等级？S460Q、S500Q、S550Q、S620Q、S690Q、S890Q和S960Q包含在附录A中。等级？SG460Q、SG500Q和SG700Q包含在附录B中。并非所有等级都适用于所有质量，有些质量有夏比V型缺口要求。 本文件中规定的钢材适用于S460Q、S500Q、S550Q、S620Q和S690Q级的最小标称厚度为3？mm，最大标称厚度为200？mm的热轧扁钢产品，S890Q和S960Q级的最大标称厚度为125？mm，SG460Q和SG500Q级的最大标称厚度为100毫米，SG700Q级的最大标称厚度为150毫米。 本文件不包括以下结构钢，其中一些由其他国际标准涵盖: -？薄板和带材？-参考ISO？TC？17/SC？12，连续轧机平轧产品； -？管状产品？参考ISO？TC？5/SC？1，钢管。 注？1？ISO/TC？17/SC？12和ISO/TC？5/SC？1涵盖的标准清单可在ISO网站上查阅。 注2:在ISO 630的所有部分中，“厚度”一词被视为“标称厚度”，除非另有说明。

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.