公开(公告)号：US20160167157A1

公开(公告)日：2016-06-16

申请号：US14907429

申请日：2014-07-22

Applicant: ArcelorMittal SA

Inventor： Astrid Perlade ,  Samuel Vignieer ,  Frederic Kegel ,  Artem Arlazarov

IPC: B23K11/11 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/12 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  B22D11/00 ,  C23C2/06 ,  C22C38/12 ,  C21D9/50

CPC classification number: B23K11/11 ,  B22D11/001 ,  B23K11/166 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D8/0436 ,  C21D9/46 ,  C21D9/50 ,  C21D9/505 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/12

Abstract: The present invention provides a spot welded joint of at least two steel sheets. At least one of the steel sheets presents yield strength above or equal to 600 MPa, an ultimate tensile strength above or equal to 1000 MPa, uniform elongation above or equal to 15%. The base metal chemical composition includes 0.05≦C≦0.21%, 4.0≦Mn≦7.0%, 0.5≦Al≦3.5%, Si≦2.0%, Ti≦0.2%, V≦0.2%, Nb≦0.2%, P≦0.025%, B≦0.0035%, and the spot welded joint contains a molten zone microstructure containing more than 0.5% of Al and containing a surface fraction of segregated areas lower than 1%, said segregated areas being zones larger than 20 μm2 and containing more than the steel nominal phosphorus content.

Abstract translation: 本发明提供至少两个钢板的点焊接头。 钢板中的至少一种具有高于或等于600MPa的屈服强度，高于或等于1000MPa的极限拉伸强度，高于或等于15％的均匀伸长率。 贱金属化学成分包括0.05和更高; CnlE; 0.21％，4.0＆amp; NlE; Mn＆NlE; 7.0％，0.5＆amp; NlE; Al＆NlE; 3.5％Si和NlE; 2.0％TiNiE 0.2％V＆ P＆nlE; 0.025％，B＆nlE; 0.0035％，点焊接头包含含有大于0.5％的Al并且含有低于1％的偏析面积的表面部分的熔融区微结构，所述偏析区域大于20μm2， 含有超过钢标称含磷量。