发明名称 |
HIGH-STRENGTH STEEL SHEET AND HIGH-STRENGTH ZINC-COATED STEEL SHEET WHICH HAVE EXCELLENT DUCTILITY AND STRETCH-FLANGEABILITY AND MANUFACTURING METHOD THEREOF |
摘要 |
This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from 1/8 to 3/8 of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is -1.2 to -0.4, and wherein an average crystal grain size in the steel sheet structure is 10 mum or less.
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申请公布号 |
US2013167980(A1) |
申请公布日期 |
2013.07.04 |
申请号 |
US201113822746 |
申请日期 |
2011.09.16 |
申请人 |
KAWATA HIROYUKI;MARUYAMA NAOKI;MURASATO AKINOBU;YOSHINAGA NAOKI;WAKABAYASHI CHISATO;SUZUKI NORIYUKI;NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
KAWATA HIROYUKI;MARUYAMA NAOKI;MURASATO AKINOBU;YOSHINAGA NAOKI;WAKABAYASHI CHISATO;SUZUKI NORIYUKI |
分类号 |
C21D8/02;C22C38/00;C22C38/02;C22C38/04;C22C38/06;C22C38/08;C22C38/12;C22C38/14;C22C38/16;C22C38/34;C22C38/38;C22C38/40;C22C38/58 |
主分类号 |
C21D8/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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