公开(公告)号：US11530459B2

公开(公告)日：2022-12-20

申请号：US16765207

申请日：2018-11-21

Applicant: ArcelorMittal

Inventor： Kangying Zhu ,  Astrid Perlade ,  Coralie Jung ,  Frederic Kegel

IPC: C21D9/46 ,  C21D8/02 ,  B23K20/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C23C2/06 ,  C23C2/12

Abstract: A cold-rolled and heat-treated steel sheet having a microstructure of, in surface fraction: between 10% and 30% of retained austenite, said retained austenite being present as films having an aspect ratio of at least 3 and as Martensite Austenite islands, less than 8% of such Martensite Austenite islands having a size above 0.5 μm, at most 10% of fresh martensite and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. A manufacturing method thereof is also provided.

公开(公告)号：US11504795B2

公开(公告)日：2022-11-22

申请号：US16293264

申请日：2019-03-05

Applicant: ArcelorMittal

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

IPC: B23K11/11 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C21D9/50 ,  B22D11/00 ,  C21D6/00 ,  C22C38/00 ,  C22C38/06 ,  C23C2/06 ,  C23C2/12 ,  B23K101/18 ,  B23K103/04 ,  B23K11/16 ,  C22C38/14 ,  B23K101/34

Abstract: A spot welded joint of at least two steel sheets is provided. 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.

公开(公告)号：US10400315B2

公开(公告)日：2019-09-03

申请号：US14901931

申请日：2014-07-03

Applicant: ArcelorMittal Investigación y Desarrollo SL

Inventor： Franco Del Frate ,  Jean-Michel Mataigne ,  Jonas Staudte ,  Astrid Perlade ,  Ian Alberto Zuazo-Rodriguez

IPC: C22C38/38 ,  C22C38/24 ,  C22C38/28 ,  C22C38/06 ,  C22C38/26 ,  C22C38/02 ,  C22C38/00 ,  C23C2/02 ,  C23C2/06 ,  C23C14/24 ,  C23C14/02 ,  C23C14/14 ,  C25D3/22 ,  C25D5/36 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  B22D11/00 ,  C23C30/00 ,  C23C2/26 ,  C23C28/02 ,  C23C28/00 ,  C23C2/04 ,  C23C2/12 ,  C23C14/58 ,  B32B15/01 ,  B32B15/04 ,  C23C14/16 ,  C22C38/44 ,  C22C38/34 ,  C22C38/18 ,  C22C38/50 ,  C22C38/48 ,  C22C38/58 ,  C22C38/14 ,  C22C38/12 ,  C22C38/04 ,  C22C38/46 ,  B32B15/18 ,  C21D1/74 ,  C21D9/52 ,  C23C2/28 ,  C23C2/40

Abstract: A cold rolled and hot dip coated steel sheet presenting a tensile strength above 1000−50×Al MPa, a uniform elongation above 15% and a low density is provided. The steel includes, by weight percent: 0.1≤C≤0.5%, 3.5≤Mn≤10.0%, 0≤Al≤9.0%, Si≤5.0%, Ti≤0.2%, V≤0.2%, Nb≤0.2%, S≤0.004%, P≤0.025%, 0.5≤Si+Al≤9.0%, B≤0.0035, Cr≤1%, The balance being Fe and impurities and the microstructure containing 25% to 90% of ferrite, 10% to 50% of austenite, kappa precipitates lower than 5% and martensite lower than 25%. The steel is able to be coated using total oxidation.

公开(公告)号：US20170183753A1

公开(公告)日：2017-06-29

申请号：US15325690

申请日：2015-07-10

Applicant: ArcelorMittal

Inventor： Jean Marc Pipard ,  Astrid Perlade ,  Bastien Weber ,  Florence Pechenot ,  Aurelie Milani

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/28 ,  C22C38/26 ,  C23C2/40 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/06 ,  C21D8/02 ,  C22C38/22

Abstract: The present invention provides a hot rolled steel sheet. The hot rolled steel sheet has a yield stress greater than 680 MPa and less than or equal to 840 MPa, at least in a direction transverse to a rolling direction, strength between 780 MPa and 950 MPa, elongation at failure greater than 10% and hole-expansion ratio (Ac) greater than or equal to 45%. The chemical composition includes, with the contents expressed by weight: 0.04%≦C≦0.08% 1.2%≦Mn≦1.9% 0.1%≦Si≦0.3% 0.07%≦Ti≦0.125% 0.05%≦Mo≦0.35% 0.15%

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。