jbt 4290-1999 高速工具钢锻件 技术条件

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1、ICS25.020J32JB/T4290－1999高速工具钢锻件技术条件Technicalrequirmentsforforgingsofhigh–speedsteelwww.bzfxw.com1999-06-24发布2000-01-01实施国家机械工业局发布JB/T4290－1999目次前言1范围····································································································

2、················································································································12引用标准····································································································································

3、·····································································13技术要素···············································································································································································

4、··························14标志及质量证明文件···············································································································································································5附录A（标准的附录）钨系高速工具钢锻件碳化物均匀度评级图·········

5、·····································································6附录B（标准的附录）钨系高速工具钢锻件带状碳化物均匀度评级图····································································8附录C（标准的附录）钨系高速工具钢锻件弯曲状碳化物均匀度评级图··················································

6、·············9附录D（标准的附录）钨钼系高速工具钢锻件碳化物均匀度评级图·······································································10附录E（标准的附录）钨钼系高速工具钢锻件带状碳化物均匀度评级图·····························································12附录F（标准的附录）钨钼系高速工具钢锻件弯曲状碳化物均匀度评级图········

7、················································13www.bzfxw.comIJB/T4290－1999前言本标准是对JB4290—86《高速工具钢锻件技术条件》的修订。本标准与JB4290—86相比，主要技术内容改变如下：1）按有关规定在格式上重新作了编排。2）按JB/T8421—1996《钢质自由锻件检验通用规则》的规定增加了标志及质量证明文件，以及对重要锻件按需要增加超声波探伤内容。3）钢号中注明了所属系列（钨系或钨钼系），以便于选用碳化物

8、均匀度评级图。4）按相关标准修改了技术术语和文字表达。本标准自实施之日起代替JB4290—86。本标准的附录A、附录B、附录C、附录D、附录E、附录F都是标准的附录。本标准由全国锻压标准化技术委员会提出并归口。本标准起草单位：上海工具厂有限公司。本标准主要起草人：刘康全、金颖、袁家栋、宋永祚。www.bzfxw.comII中华人民共和国机械行业标准JB/T4290－1999高速工具钢锻件技术条件代替JB4290—86Technicalrequirmentsforforgingsofhigh–sp