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 15 μm 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 590 MPa or more, excellent in material homogeneity and capable of giving excellent cold rolling property. |
申请公布号 |
US9574254(B2) |
申请公布日期 |
2017.02.21 |
申请号 |
US201214346786 |
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 |
C22C38/02;C22C38/04;C22C38/06;C22C38/08;C22C38/14;C22C38/16;C22C38/18;C22C38/26;C23C2/06;C21D9/46;C22C38/12;B32B15/01;C22C38/00;C21D8/02;C22C18/00;C22C18/02 |
主分类号 |
C22C38/02 |
代理机构 |
RatnerPrestia |
代理人 |
RatnerPrestia |
主权项 |
1. A hot rolled steel sheet having 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; Ai: 0.01% to 0.10%; N: 0.010% or less; Nb: 0.010% to 0.100%, wherein Nb is included so that content of solute Nb is 25% or more relative to the total Nb content; and the balance including Fe and incidental impurities,
the steel sheet further having a microstructure with complex phase wherein ferrite with an average crystal grain diameter within a range of not less than 3 pm to not more than 15 pm is contained at a volume fraction of not less than 75%, the balance comprising low-temperature-induced phases. |
地址 |
Chiyoda-ku, Tokyo JP |