本文件规定了在轧制（仅适用于SG等级）、正火/正火轧制和热机械加工交货条件下热轧可焊接细晶粒结构钢扁平和长产品的要求。它适用于在可逆轧机上轧制的钢板、宽扁钢、热轧型材和棒材，用于焊接或螺栓连接结构的重载部件。 这份文件包括？13个等级和6个品质。S275、S355、S390、S420、S460和S500等级在附录？A.附件中涵盖了SG245、SG290、SG325、SG345、SG365、SG415和SG460等级？B.并非所有等级都有所有品质，有些品质有夏比V型缺口要求。 本文件规定的钢材适用于最小公称厚度为3？mm，最大公称厚度为250？mm对于S275N、S355N、S390N、S420N和S460N等级，最大标称厚度为150？等级mms S275M、S355M、S390M、S420M、S460M和S500M，最大标称厚度为200？mm对于SG245、SG325和SG415等级，最大标称厚度为100？SG345、SG365和SG460等级为mm，最大公称厚度为40？SG290级mm。 本文件不包括以下结构钢，其中一些结构钢由其他国际标准涵盖: —？板材和带材-参考ISO TC？17/SC？12、连续轧制平轧产品； —？管状产品-参考ISO TC？5/SC？1、钢管。 笔记？1？ISO/TC涵盖的标准列表？17/SC？12和ISO/TC？5/SC？1可在ISO网站上获得。 笔记？2？在ISO的所有部分？在图630中，除非另有说明，否则术语“厚度”被认为是“标称厚度”。

This document specifies requirements for flat and long products of hot-rolled weldable fine-grain structural steels in the as-rolled (for SG grades only), normalized/normalized rolled and thermomechanical processed delivery conditions. It applies to steel plates rolled on a reversing mill, wide flats, hot-rolled sections and bars, which are intended for use in heavily loaded parts of welded or bolted structures. This document covers？13 grades and 6 qualities. Grades S275, S355, S390, S420, S460 and S500 are covered in Annex？A. Grades SG245, SG290, SG325, SG345, SG365, SG415 and SG460 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 plates, wide flats, sections and bars with a minimum nominal thickness of 3？mm and a maximum nominal thickness of 250？mm for grades S275N, S355N, S390N, S420N and S460N, a maximum nominal thickness of 150？mm for grades S275M, S355M, S390M, S420M, S460M, and S500M, a maximum nominal thickness of 200？mm for grades SG245, SG325 and SG415, a maximum nominal thickness of 100？mm for grades SG345, SG365 and SG460, and a maximum nominal thickness of 40？mm for grade SG290. 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.