发明名称 |
HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME |
摘要 |
Provided is a hot-rolled steel sheet that has a chemical composition including, by mass%: C: 0.060 % to 0.150 %; Si 0.15 % to 0.70 %; Mn: 1.00 % to 1.90 %; 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 %; and the balance being Fe and incidental impurities. The hot-rolled steel sheet has a microstructure containing ferrite of 18 µm or less in average grain size by a volume fraction of at least 75 % and pearlite of at least 2 µm in average grain size by a volume fraction of at least 5 %, the balance being low-temperature-induced phases, the pearlite having a mean free path of at least 5.0 µm. The hot-rolled steel sheet can be suitably utilized for producing a cold rolled steel sheet or hot-dip galvanized steel sheet having excellent material homogeneity and a tensile strength of 590 MPa or more. |
申请公布号 |
EP2762581(A4) |
申请公布日期 |
2015.05.20 |
申请号 |
EP20120835555 |
申请日期 |
2012.09.27 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
TAKASHIMA, KATSUTOSHI;TOJI, YUKI;HASEGAWA, KOHEI |
分类号 |
C22C38/00;B21B1/26;B21B3/00;B32B15/01;C21D8/02;C21D8/04;C21D9/46;C21D9/48;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 |
|
代理人 |
|
主权项 |
|
地址 |
|