发明授权
- 专利标题： Ultra-fine grain steel and method for producing it
- 专利标题（中）： 超细晶粒钢及其制造方法
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申请号： US09157394申请日： 1998-09-21
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公开(公告)号： US06221178B1公开(公告)日： 2001-04-24
- 发明人: Shiro Torizuka , Kaneaki Tsuzaki , Kotobu Nagai , Osamu Umezawa
- 申请人： Shiro Torizuka , Kaneaki Tsuzaki , Kotobu Nagai , Osamu Umezawa
- 优先权： JP256682 19970922; JP256802 19970922; JP052545 19980304
- 主分类号： C22C3800
- IPC分类号： C22C3800
摘要：
The invention provides an ultra-fine grain steel comprising fine ferrite grains as oriented at random and surrounded by large angle grain boundaries. The steel comprises fine ferrite grains having a mean grain size of not larger and 3.0 &mgr;m and surrounded by large angle grain boundaries having an misorientation not smaller than 15°.