发明名称 |
COLD ROLLED STEEL SHEET PLATED STEEL SHEET METHOD FOR PRODUCING COLD ROLLED STEEL SHEET AND METHOD FOR PRODUCING PLATED STEEL SHEET |
摘要 |
This cold rolled steel sheet contains in mass% from 0.020% to 0.080% (inclusive) of C from 0.20% to 1.00% (inclusive) of Si from 0.80% to 2.30% (inclusive) of Mn and from 0.010% to 0.100% (inclusive) of Al while containing Nb and/or Ti so that the condition 0.005% = Nb + Ti < 0.030% is satisfied. The metal structure of this cold rolled steel sheet is composed of ferrite bainite and other phases; and the area ratio of the ferrite is 80% or more but less than 95% the area ratio of non recrystallized ferrite in the ferrite is 1% or more but less than 10% and the area ratio of the bainite is from 5% to 20%. The total of the fractions of the other phases is less than 8%. A carbonitride containing one or both of Nb and Ti has a circle equivalent diameter of from 1 nm to 10 nm (inclusive). This cold rolled steel sheet has a tensile strength of 590 MPa or more. |
申请公布号 |
IN6146DEN2014(A) |
申请公布日期 |
2015.08.21 |
申请号 |
IN2014DELNP6146 |
申请日期 |
2014.07.22 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
KONDO YUSUKE;HAYASHI KUNIO;OGAWA TOSHIO;MATSUTANI NAOKI;GOTO KOICHI |
分类号 |
C22C38/00;C21D9/46;C22C38/14 |
主分类号 |
C22C38/00 |
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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