公开(公告)号：US20110168304A1

公开(公告)日：2011-07-14

申请号：US13053879

申请日：2011-03-22

申请人： Nobuyuki ISHIKAWA ,  Toyohisa SHINMIYA ,  Minoru SUWA ,  Shigeru ENDO

发明人： Nobuyuki ISHIKAWA ,  Toyohisa SHINMIYA ,  Minoru SUWA ,  Shigeru ENDO

IPC分类号： C21D8/02

CPC分类号： C22C38/04 ,  C21D1/19 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/12 ,  C22C38/14 ,  Y10T428/12951 ,  Y10T428/12965

摘要： A high strength steel plate containing 0.02 to 0.08% C, by mass, and has substantially a two phase microstructure of ferrite and bainite. The ferrite contains precipitates having a particle size of 30 nm or smaller grain size. The steel plate has a yield strength of 448 MPa or higher. A method for manufacturing the high strength steel plate which comprises hot rolling, accelerated cooling and reheating. The accelerated cooling is conducted down to a temperature of 300 to 600° C. at a cooling rate of 5° C./s or higher. The reheating is conducted up to a temperature of 550 to 700° C. at a heating rate of 0.5° C./s or higher.

摘要翻译： 含有0.02〜0.08％C质量％的高强度钢板，并具有铁素体和贝氏体的两相显微组织。 铁素体含有粒径为30nm以下的析出物。 钢板的屈服强度为448MPa以上。 一种制造高强度钢板的方法，其包括热轧，加速冷却和再加热。 加速冷却以5℃/ s以上的冷却速度进行到300〜600℃的温度。 以0.5℃/ s以上的加热速度将再加热进行到550〜700℃的温度。