发明授权
- 专利标题: Hot rolled steel sheet having an ultrafine grain structure and process for producing steel sheet
- 专利标题(中): 具有超细晶粒结构的热轧钢板和钢板的制造方法
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申请号: US09427270申请日: 1999-10-26
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公开(公告)号: US06290784B1公开(公告)日: 2001-09-18
- 发明人: Eiko Yasuhara , Akio Tosaka , Osamu Furukimi
- 申请人: Eiko Yasuhara , Akio Tosaka , Osamu Furukimi
- 优先权: JP10-319262 19981110
- 主分类号: C22C3814
- IPC分类号: C22C3814
摘要:
A hot rolled steel sheet comprises ultrafine ferrite grains as a main phase and fine second phase particles. The ferrite grains have an average grain size of not less than 2 &mgr;m but less than 4 &mgr;m. The second phase has an average particle size of not more than 8 &mgr;m and in not less than 80% of the second phase, the spacing of the second phase particle with the closest second phase particle is not less than the second phase particle size. The steel sheet has an ultrafine grain structure, superior mechanical characteristics, reduced anisotropy in its mechanical characteristics and high formability. A process for producing the steel sheet is also disclosed.