公开(公告)号：US20120234438A1

公开(公告)日：2012-09-20

申请号：US13383193

申请日：2010-06-17

申请人： Satoshi Oi ,  Shigeyoshi Nishiyama ,  Fuyuki Yoshida ,  Yuji Kusumoto ,  Osamu Akisue

发明人： Satoshi Oi ,  Shigeyoshi Nishiyama ,  Fuyuki Yoshida ,  Yuji Kusumoto ,  Osamu Akisue

IPC分类号： C21D8/02 ,  C22C38/58 ,  C21D6/00

CPC分类号： C22C38/02 ,  C21D1/26 ,  C21D8/0236 ,  C21D9/0006 ,  C21D9/0037 ,  C21D9/46 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/50 ,  C22C38/58

摘要： Provided are a cold-rolled steel sheet which undergoes a small load at the time of cold-rolling, has excellent press formability and high strength, and a method of manufacturing the cold-rolled steel sheet. A hot-rolled steel sheet having the composition comprising by mass %, 0.10 to 0.30 C, 0.2 or more Mn, 0.01 or more Ni, 0.5 to 2.5 Mn+Ni, 1.2 to 9.0 Cr, and Fe and unavoidable impurities as a balance, and has a tensile strength of 1000 MPa or less is subjected to pickling and, is subjected to cold rolling at a total rolling reduction of 60% or more thus forming a cold-rolled steel sheet. A final continuous annealing treatment is performed at a soaking temperature of 750° C. or above and at a cooling rate of 3° C./s to 100° C./s so that the cold-rolled steel sheet which has a tensile strength of 1280 MPa or more, breaking elongation of 3% or more, and a thickness of 0.05 to 0.60 mm is manufactured.

摘要翻译： 本发明提供一种冷轧时的负荷小，冲压成形性，强度优异的冷轧钢板以及冷轧钢板的制造方法。 具有质量％，0.10〜0.30℃，0.2以上Mn，0.01以上Ni，0.5〜2.5Mn + Ni，1.2〜9.0Cr，Fe和余量不可避免的杂质的组成的热轧钢板， 并且具有1000MPa以下的拉伸强度进行酸洗，并且在总压下率为60％以上的条件下进行冷轧，从而形成冷轧钢板。 在750℃或以上的均热温度和3℃/ 100℃的冷却速度下进行最终的连续退火处理，使得具有拉伸强度的冷轧钢板 为1280MPa以上，断裂伸长率为3％以上，厚度为0.05〜0.60mm。