发明授权
- 专利标题: Hot rolled steel sheet with high strength and distinguished formability
- 专利标题(中): 热轧钢板,强度高,成型性好
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申请号: US442445申请日: 1989-11-27
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公开(公告)号: US5017248A公开(公告)日: 1991-05-21
- 发明人: Osamu Kawano , Manabu Takahashi , Junichi Wakita , Kazuyoshi Esaka
- 申请人: Osamu Kawano , Manabu Takahashi , Junichi Wakita , Kazuyoshi Esaka
- 申请人地址: JPX Tokyo
- 专利权人: Nippon Steel Corporation
- 当前专利权人: Nippon Steel Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX62-138060 19870603; JPX63-44527 19880229
- 主分类号: C21D1/19
- IPC分类号: C21D1/19 ; C21D8/02 ; C22C38/00
摘要:
A hot rolled steel sheet with a high strength and a distinguished formability, and a process for producing the same are disclosed. The steel sheet comprises 0.15 to 0.4% by weight of C, 0.5 to 2.0% by weight of Si, and 0.5 to 2.0% by weight of Mn, the balance being iron and inevitable impurities, and has a microstructure composed of ferrite, bainite and retained austenite phases with the ferrite phase being in a ratio (V.sub.PF /d.sub.PF) of polygonal ferrite volume fraction V.sub.PF (%) to polygonal ferrite average grain size d.sub.PF (.mu.m) of 7 or more and the retained austenite phase being contained in an amount of 5% by volume or more on the basis of the total phases. The steel sheet can be produced with a high productiviity and without requiring special alloy elements.
公开/授权文献
- US3936598A Electronic image density analysis 公开/授权日:1976-02-03