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.