公开(公告)号：EP2689045A2

公开(公告)日：2014-01-29

申请号：EP12714743.7

申请日：2012-03-23

申请人： Arcelormittal Investigación y Desarrollo SL

发明人： PERLADE, Astrid ,  AMARD, Aurélie ,  PECHENOT, Florence ,  STENBACK, Erik ,  PIPARD, Jean Marc ,  HASSANI, Farid, E.

IPC分类号： C21D8/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C21D9/46

CPC分类号： C22C38/58 ,  B65G45/10 ,  B65G45/24 ,  C21D6/005 ,  C21D8/0263 ,  C21D8/04 ,  C21D8/0405 ,  C21D8/041 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C23C2/02 ,  C23C2/06 ,  F27B9/243 ,  F27D3/026

摘要： The invention relates mainly to a hot-rolled steel sheet having: a yield strength greater than 690 MPa and less than or equal to 840 MPa, strength of between 780 MPa and 950 MPa, elongation at break greater than 10 % and a hole expansion ratio (Ac) greater than or equal to 50%. The chemical composition of the sheet of the invention comprises the following, expressed by weight, namely: 0.040 % ≤ C ≤ 0.065 %, 1.4 % ≤ Mn ≤ 1.9 %, 0.1% ≤ Si ≤ 0.55 %, 0.095 % ≤ Ti ≤ 0.145 %, 0.025 % ≤ Nb ≤ 0.045 %, 0.005 % ≤ Al ≤ 0.1 %, 0.002% ≤ N ≤ 0.007 %, S ≤ 0.004 %, P L measured parallel to the rolling direction and the grain size D
N measured perpendicularly to the rolling direction is less than or equal to 1.4. The invention also relates to methods for producing one such sheet, in which the composition can optionally include chromium.

摘要翻译： 屈服应力大于690MPa且小于或等于840MPa，强度在780MPa和950MPa之间，断裂伸长率大于10％，孔膨胀比（Ac）大于或等于的热轧钢板 至50％。 还描述了用于制造片材的方法。