公开(公告)号：US20160160309A1

公开(公告)日：2016-06-09

申请号：US14907358

申请日：2014-07-24

Applicant: ARCELORMITTAL SA

Inventor： Sebastien Allain ,  Jean-Christophe Hell

IPC: C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/26 ,  C23C2/06 ,  C23C2/40 ,  B22D7/00 ,  C22C38/58

CPC classification number: C21D9/46 ,  B22D7/00 ,  B32B15/013 ,  C21D1/26 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

Abstract: The invention relates to the manufacture of a cold-rolled steel sheet having a strength of more than 900 MPa, an elastic limit of more than 700 MPa and distributed elongation of more than 12%, the composition of which includes, the contents being expressed as weight percentages: 0.26%≦C≦0.45%, 1.0%≦Mn≦3.0%, 1.0%≦Si≦3.0%, Al≦0.10%, 0%≦Cr≦1.5% %, S≦0.005%, P≦0.020%, Nb≦0.1%, Ti≦0.020%, V≦0.015%, N≦0.01%, the remainder of the composition being iron and inevitable impurities resulting from the production process. The microstructure, given in surface proportions, comprises 13% to 25% residual austenite and 13% to 30% MA islands, the remainder consisting of bainite and possibly ferrite.

Abstract translation: 本发明涉及制造强度超过900MPa，弹性极限超过700MPa，分布伸长率大于12％的冷轧钢板，其组成包括内容物表示为 重量百分比：0.26％＆lt; NlE; C＆nlE; 0.45％，1.0％＆nlE; Mn＆nlE; 3.0％，1.0％＆nlE; Si＆amp; NEE; 3.0％Al和nIE; 0.10％，0％ P <0.01; 0.020％，Nb＆nlE; 0.1％，Ti＆NlE; 0.020％，V＆NlE; 0.015％，N＆lt; l1; 0.01％，组成的剩余部分为铁和生产过程产生的不可避免的杂质。 以表面比例给出的微结构包含13％至25％的残余奥氏体和13％至30％的MA岛，其余部分由贝氏体和可能的铁素体组成。