BS EN ISO 683-3:2019被替代
Heat-treatable steels, alloy steels and free-cutting steels
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专家解读视频
This document specifies the technical delivery requirements for semi-finished products, hot formed, e.g. blooms, billets, slabs (see NOTE1), bars (see NOTE1), wire rod, finished flat products, and hammer or drop forgings (see NOTE1) manufactured from the case-hardening non-alloy or alloy steels listed in Table3 and supplied in one of the heat-treatment conditions given for the different types of products in Table1 and in one of the surface conditions given in Table2. The steels are, in general, intended for the manufacture of case-hardened machine parts. NOTE1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammer-forged bars are covered under semi-finished products or bars and not under the term “hammer and drop forgings??. NOTE2 For International Standards relating to steels complying with the requirements for the chemical composition in Table3, however, supplied in other product forms or treatment conditions than given above or intended for special applications, and for other related International Standards, see the Bibliography. In special cases, variations in these technical delivery requirements or additions to them can form the subject of an agreement at the time of enquiry and order (see 5.2 and AnnexA). In addition to this document, the general technical delivery requirements of ISO404 are applicable.
