发明授权
- 专利标题： High strength phosphorus-containing steel and method for producing the same
- 专利标题（中）： 高强度含磷钢及其制造方法
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申请号： US09386503申请日： 1999-08-31
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公开(公告)号： US06287397B1公开(公告)日： 2001-09-11
- 发明人: Toshihiro Hanamura , Hiroshi Nakajima , Shiro Torizuka , Kaneaki Tsuzaki , Kotobu Nagai
- 申请人： Toshihiro Hanamura , Hiroshi Nakajima , Shiro Torizuka , Kaneaki Tsuzaki , Kotobu Nagai
- 优先权： JP10-260957 19980831
- 主分类号： C21D800
- IPC分类号： C21D800
摘要：
A high strength phosphorus-containing steel having fine texture free from the problem of embrittlement by positively using the presence of P, which is a carbon steel having an average ferritic grain diameter of 3 &mgr;m or less and containing from 0.04 to 0.1% by mass of P, wherein the volume fraction of P segregated in the grain boundary accounts for 0.3 or less in case the grain boundary is covered by a P layer 1 nm in thickness.