发明授权
- 专利标题： Method of production of steel superior in machinability
- 专利标题（中）： 生产机械加工性能优良的方法
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申请号： US12288542申请日： 2008-10-20
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公开(公告)号： US08137484B2公开(公告)日： 2012-03-20
- 发明人: Masayuki Hashimura , Atsushi Mizuno , Kenichiro Naito , Hiroshi Hagiwara , Kohichi Isobe , Hiroshi Hirata
- 申请人： Masayuki Hashimura , Atsushi Mizuno , Kenichiro Naito , Hiroshi Hagiwara , Kohichi Isobe , Hiroshi Hirata
- 申请人地址： JP 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： JP Tokyo
- 代理机构： Kenyon & Kenyon LLP
- 优先权： JP2002-332658 20021115; JP2002-332665 20021115; JP2002-332668 20021115; JP2002-332669 20021115; JP2002-332695 20021115; JP2002-332707 20021115; JP2003-374489 20031104; JP2003-374511 20031104; JP2003-374517 20031104
- 主分类号： C21D7/13
- IPC分类号： C21D7/13 ; C22C38/04 ; C22C38/60
摘要：
The present invention provides steel superior in machinability comprised of, by wt %, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.2 to 3.0%, P: 0.001 to 0.2%, S: 0.03 to 1.0%, T.N: 0.002 to 0.02%, T.O: 0.0005 to 0.035%, and the balance of Fe and unavoidable impurities, said steel satisfying one or both of Mn/S in the steel being 1.2 to 2.8 or an area ratio of pearlite over a grain size of 1 μm in a microstructure of the steel being not more than 5%.
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