公开(公告)号：US20140246128A1

公开(公告)日：2014-09-04

申请号：US14347277

申请日：2012-09-27

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Kohei Hasegawa

IPC: C22C38/26 ,  C22C38/16 ,  C22C38/14 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/12

CPC classification number: C22C38/26 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/009 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58 ,  C23C2/06

Abstract: 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 including 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.

Abstract translation: 本发明提供一种热轧钢板，其特征在于，具有质量％：C：0.060〜0.150％的化学组成; Si：0.15〜0.70％ Mn：1.00〜1.90％ P：0.10％以下; S：0.010％以下; Al：0.01〜0.10％ N：0.010％以下; Nb：0.010〜0.100％ 余量包括铁和杂质。 该热轧钢板的平均粒径为18μm以下，铁素体的体积分数为75％以上，平均粒径为2μm以上的珠光体的体积分数为5％以上的微结构， 余量为低温诱导相，珠光体具有至少5.0μm的平均自由程。

公开(公告)号：US20140234655A1

公开(公告)日：2014-08-21

申请号：US14346363

申请日：2012-09-27

Applicant: JFE Steel Corporation

Inventor： Katsutoshi Takashima ,  Yuki Toji ,  Nobusuke Kariya ,  Kohei Hasegawa

IPC: C23C2/02 ,  B32B15/01

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

Abstract: A high-strength hot-dip galvanized steel sheet has excellent workability, namely, excellent ductility and hole expansion formability, and high yield ratio. The steel sheet has a chemical composition containing by mass %: C: 0.05-0.15%; Si: 0.10-0.90%; Mn: 1.0-1.9%; P: 0.005-0.10%; S: 0.0050% or less; Al: 0.01-0.10%; N: 0.0050% or less; Nb: 0.010-0.100%; and the balance being Fe and incidental impurities, in which: the steel sheet has a complex phase that includes: ferrite having an average crystal grain size of 15 μm or less to at least 90% in volume fraction; martensite having an average crystal grain size of 3.0 μm or less to 0.5% or more and less than 5.0% in volume fraction; pearlite to 5.0% or less in volume fraction; and the balance being a phase generated at low temperature.

Abstract translation: 高强度热浸镀锌钢板具有优异的可加工性，即延展性和孔膨胀成形性优异，成品率高。 该钢板具有以质量％计含有的化学成分：C：0.05〜0.15％ Si：0.10-0.90％; Mn：1.0-1.9％ P：0.005-0.10％; S：0.0050％以下; Al：0.01-0.10％; N：0.0050％以下; Nb：0.010-0.100％ 余量为Fe和偶然杂质，其中：钢板具有复相，其包含：平均晶粒尺寸为15μm以下的铁素体，体积分数为至少90％; 马氏体的平均结晶粒径为3.0μm以下，体积分率为0.5％以上且小于5.0％ 珠光体至体积分数的5.0％以下; 余量为在低温下产生的相。