发明名称 |
HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME |
摘要 |
A hot rolled steel sheet has a chemical composition including, by mass%, C: 0.060% to 0.120%; Si: 0.10% to 0.70%; Mn: 1.00% to 1.80%; P: 0.10% or less; S: 0.010% or less; Al: 0.01% to 0.10%; N: 0.010% or less; Nb: 0.010% to 0.100%, wherein Nb is contained so that content of solute Nb is 5% or more relative to the total Nb content; the balance being Fe and incidental impurities. The hot rolled steel sheet has a microstructure containing ferrite of not more than 15µm in average crystal grain diameter by a volume fraction of not less than 75%, the balance being low-temperature-induced phases. The hot rolled steel sheet can be suitably utilized for manufacturing a cold rolled steel sheet or hot-dip galvanized steel sheet having a tensile strength of 590MPa or more, excellent in material homogeneity and capable of giving excellent cold rolling property. |
申请公布号 |
EP2762584(A1) |
申请公布日期 |
2014.08.06 |
申请号 |
EP20120835898 |
申请日期 |
2012.09.27 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
TAKASHIMA, KATSUTOSHI;TOJI, YUKI;HASEGAWA, KOHEI;YAMAGUCHI, SHINYA |
分类号 |
C22C38/00;B21B3/00;B32B15/01;C21D8/02;C21D9/46;C22C38/02;C22C38/04;C22C38/06;C22C38/08;C22C38/12;C22C38/14;C22C38/16;C22C38/26;C22C38/58;C23C2/06 |
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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