本文件规定了一般结构用钢的质量。本文件适用于在可逆式轧机上轧制的钢板、宽扁钢、热轧型材和棒材，它们在交付状态下使用，通常用于焊接或螺栓连接结构。 本文件涵盖8个钢种和4种质量。S235、S275、S355和S460等级包含在附录A中。SG205、SG250、SG285和SG345等级包含在附录B中。并非所有等级都适用于所有质量，有些质量具有夏比V型缺口要求。 本文件中规定的钢材适用于以下热轧扁钢产品和型材: -？厚度≥？3毫米≤？所有质量等级为S460钢的长产品为150毫米； -？厚度≥？3毫米≤？250毫米长的产品或≤？400毫米，适用于所有其他等级和质量的扁平产品； 对于扁平产品、型材和长形产品，SG205、SG250、SG285和SG345级的标称厚度没有限制。 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 steels for general structural use. This document applies to steel plates rolled on a reversing mill, wide flats, hot-rolled sections and bars, which are used in the as-delivered condition and normally intended for welded or bolted structures. This document covers 8 steel grades and 4 qualities. Grades？S235, S275, S355, and S460 are covered in Annex？A. Grades？SG205, SG250, SG285 and SG345 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 and sections with: —？thicknesses ≥？3？mm and ≤？150？mm for long products of steel grade S460 all qualities; —？thicknesses ≥？3？mm and ≤？250？mm for long products or ≤？400？mm for flat products of all other grades and qualities; and no restriction on nominal thickness for grades SG205, SG250, SG285, and SG345 for flat products, sections and long products. 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.