发明授权
- 专利标题： Good-workability and high-strength cold-rolled steel sheet excellent in post-painting corrosion resistance
- 专利标题（中）： 良好的加工性和高强度的冷轧钢板，后涂耐腐蚀性优异
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申请号： US10732336申请日： 2003-12-09
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公开(公告)号： US07678204B2公开(公告)日： 2010-03-16
- 发明人: Toshiyuki Katsumi , Kazuhiko Honda , Koki Tanaka , Kaoru Yamazaki , Takahiro Tanae , Katsuyoshi Kaneko , Yoshikazu Umeno , Yoshitaka Okitsu
- 申请人： Toshiyuki Katsumi , Kazuhiko Honda , Koki Tanaka , Kaoru Yamazaki , Takahiro Tanae , Katsuyoshi Kaneko , Yoshikazu Umeno , Yoshitaka Okitsu
- 申请人地址： JP Tokyo JP Tokyo
- 专利权人： Nippon Steel Corporation,Honda Motor Co., Ltd.
- 当前专利权人： Nippon Steel Corporation,Honda Motor Co., Ltd.
- 当前专利权人地址： JP Tokyo JP Tokyo
- 代理机构： Kenyon & Kenyon LLP
- 优先权： JP2002-357547 20021210
- 主分类号： C22C38/14
- IPC分类号： C22C38/14
摘要：
The present invention: provides a good-workability and high-strength cold-rolled steel sheet excellent in post-painting corrosion resistance to the extent of securing excellent resistance to salt warm water immersion which is a good-workability and high-strength cold-rolled steel sheet excellent in post-painting corrosion resistance characterized in that: said steel sheet contains, in mass, 0.16 to 0.19% C, 1.10 to 1.30% Si, 1.50 to 1.60% Mn, not more than 0.1% P and 0.015 to 0.050% Al, with the balance consisting of Fe and unavoidable impurities; the average of the amount of Si incrassating on the surface of said steel sheet is not more than 20 times the Si concentration in said steel sheet; and the area percentage of the portions where the ratio of the Si concentration on the surface of said steel sheet to the Si concentration in said steel sheet is not less than 10 is not more than 95%.
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