发明名称 |
HIGH-STRENGTH STEEL SHEET, HOT-DIPPED STEEL SHEET, AND ALLOY HOT-DIPPED STEEL SHEET THAT HAVE EXCELLENT FATIGUE, ELONGATION, AND COLLISION CHARACTERISTICS, AND MANUFACTURING METHOD FOR SAID STEEL SHEETS |
摘要 |
<p>This high-strength steel sheet includes: in terms of percent by mass, 0.03 to 0.10% of C; 0.01 to 1.5% of Si; 1.0 to 2.5% of Mn; 0.1% or less of P; 0.02% or less of S; 0.01 to 1.2% of Al; 0.06 to 0.15% of Ti; and 0.01% or less of N; and contains as the balance, iron and inevitable impurities, wherein a tensile strength is in a range of 590 MPa or more, and a ratio of a yield strength to the tensile strength is in a range of 0.80 or more, a microstructure includes bainite at an area ratio of 40% or more and the balance being either one or both of ferrite and martensite, a density of Ti(C,N) precipitates having sizes of 10 nm or smaller is in a range of 10 10 precipitates/mm3 or more, and a ratio (Hvs/Hvc) of a hardness (Hvs) at a depth of 20 µm from a surface to a hardness (Hvc) at a center of a sheet thickness is in a range of 0.85 or more.</p> |
申请公布号 |
CA2759256(C) |
申请公布日期 |
2013.11.19 |
申请号 |
CA20102759256 |
申请日期 |
2010.05.26 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
HAYASHI, KUNIO;TOMOKIYO, TOSHIMASA;FUJITA, NOBUHIRO;MATSUTANI, NAOKI;GOTO, KOICHI |
分类号 |
C22C38/14;C21D8/02;C21D9/46 |
主分类号 |
C22C38/14 |
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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