发明申请
- 专利标题： COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
- 专利标题（中）： 冷轧钢板及其制造方法
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申请号： US12919780申请日： 2009-02-26
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公开(公告)号： US20110048588A1公开(公告)日： 2011-03-03
- 发明人: Tetsuya Mega , Nobuyuki Nakamura , Takashi Kobayashi , Yasunobu Nagataki , Takayoshi Kabeya
- 申请人： Tetsuya Mega , Nobuyuki Nakamura , Takashi Kobayashi , Yasunobu Nagataki , Takayoshi Kabeya
- 申请人地址： JP Tokyo
- 专利权人： JFE Steel Corporation
- 当前专利权人： JFE Steel Corporation
- 当前专利权人地址： JP Tokyo
- 优先权： JP2008-050916 20080229; JP2008-287692 20081110
- 国际申请： PCT/JP2009/054102 WO 20090226
- 主分类号： C21D8/02
- IPC分类号： C21D8/02 ; C22C38/04
摘要：
A cold-rolled steel sheet has a partially recrystallized grain structure with a degree of unrecrystallization of 25% to 90% and a Rockwell hardness HRB of 83 or more, the cold-rolled steel sheet containing 0.01% to 0.15% C, 0.03% or less Si, 0.10% to 0.70% Mn, 0.025% or less P, 0.025% or less S, 0.01% to 0.05% Al, and 0.008% or less N on a mass basis, the remainder being Fe and unavoidable impurities, wherein the mean diameter of ferrite is 2 to 10 μm and these components satisfy Formula (1): (C %)+0.15×(Mn %)+0.85×(P %)≧0.21, wherein (M %) represents the content (mass percent) of an element M.