公开(公告)号：US11591665B2

公开(公告)日：2023-02-28

申请号：US16956390

申请日：2018-12-18

Applicant: ArcelorMittal

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

IPC: C01D9/00 ,  C21D8/00 ,  C22C38/00 ,  C23C2/12 ,  C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/32 ,  C23C2/06

Abstract: A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.

公开(公告)号：US11590599B2

公开(公告)日：2023-02-28

申请号：US16492437

申请日：2018-02-27

Applicant: ArcelorMittal ,  Universite de Nantes

Inventor： Céline Musik ,  Kangying Zhu ,  Didier Hun ,  Jean-Michel Mataigne ,  Astrid Perlade ,  Renaud Frappier

IPC: B23K11/11 ,  B23K11/16 ,  B32B15/01 ,  B23K101/18 ,  B23K103/04 ,  B23K101/34 ,  B23K101/00

Abstract: A method for resistance spot welding comprising the following successive steps: —providing at least two steel sheets with thickness (th) comprised between 0.5 and 3 mm, at least one of the sheets being a zinc or zinc-alloy coated steel sheet (A) with a tensile strength (TS) higher than 800 MPa and a total elongation (TEL) such as (TS)×(TEL)>14000 MPa %, wherein the composition of the steel substrate of (A) contains, in weight: 0.05%≤C≤0.4%, 0.3%≤Mn≤8%, 0.010%≤Al≤3%, 0.010%≤Si≤2.09%, with 0.5%≤(Si+Al)≤3.5%, 0.001%≤Cr≤1.0%, 0.001%≤Mo≤0.5% and optionally: 0.005%≤Nb≤0.1%, 0.005%≤V≤0.2%, 0.005%≤Ti≤0.1%, 0.0003%≤B≤0.005%, 0.001%≤Ni≤1.0%, the remainder being Fe and unavoidable impurities, —performing resistance spot welding of the at least two steel sheets for producing a weld with an indentation depth (IDepth) on the surface of said steel sheet (A) such as: 100 μm≤(IDepth)≤18.68 (Znsol)−55.1, wherein (IDepth) is in micrometers and wherein Znsol is the solubility of Zn in the steel of sheet (A) at 750° C., in weight %.

公开(公告)号：US11434541B2

公开(公告)日：2022-09-06

申请号：US16332619

申请日：2017-09-15

Applicant: ArcelorMittal

Inventor： Coralie Magar ,  Kangying Zhu ,  Astrid Perlade

IPC: C21D8/02 ,  B23K11/11 ,  C21D1/18 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

Abstract: A cold-rolled and heat-treated steel sheet, having a composition including, by weight percent: 0.10%≤C≤0.40%, 3.5%≤Mn≤8.0%, 0.5%≤Si≤2.5%, 0.003%≤Al≤3.0%, with Si+Al≥0.8%, 0.001%≤Mo≤0.5%, S≤0.010%, P≤0.020%, N≤0.008%, and optionally one or more elements selected from a group comprising Cr, Ti, Nb, V and B, such that: 0.01%≤Cr≤2.0%, 0.010%≤Ti≤0.080%, 0.010%≤Nb≤0.080%, 0.010%≤V≤0.30%, 0.0005%≤B≤0.003%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The microstructure includes, in surface fraction, between 10% and 50% of retained austenite, at most 8% of fresh martensite, and tempered martensite. The retained austenite includes Mn-enriched austenite, having a Mn content higher than 1.3*Mn %, Mn % designating the Mn content of the steel sheet, a surface fraction of the Mn-enriched austenite with respect to the whole microstructure is between 2% and 12%, and Mn-poor austenite, having an Mn content between 0.5*Mn % and 1.3*Mn %.

公开(公告)号：US10900105B2

公开(公告)日：2021-01-26

申请号：US14404750

申请日：2013-05-27

Applicant: ARCELORMITTAL

Inventor： Astrid Perlade ,  Ian Alberto Zuazo Rodriguez ,  Xavier Garat

IPC: C22C38/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D8/02 ,  C21D9/46 ,  C21D6/00 ,  C21D8/04 ,  B21B1/46 ,  B21B45/02 ,  B21C47/02

Abstract: A rolled steel sheet is provided. The rolled steel sheet has a mechanical strength greater than or equal to 600 MPa and an elongation at fracture that is greater than or equal to 20%. A a method for its fabrication is also provided. The chemical composition of the steel sheet includes 0.10≤C≤0.30%, 6.0≤Mn≤15.0%, 6.0≤Al≤15.0%, and optionally one or more elements selected from among: Si≤2.0%, Ti≤0.2%, V≤0.6% and Nb≤0.3%. The remainder of the composition includes iron and the unavoidable impurities resulting from processing. The ratio of the weight of manganese to the weight of aluminum is such that Mn Al > 1.0 . The microstructure of the sheet includes ferrite, austenite and up to 5% Kappa precipitates in area fraction.

公开(公告)号：US20200009679A1

公开(公告)日：2020-01-09

申请号：US16492437

申请日：2018-02-27

Applicant: ArcelorMittal ,  Universite de Nantes

Inventor： Céline Musik ,  Kangying Zhu ,  Didier Hun ,  Jean-Michel Mataigne ,  Astrid Perlade ,  Renaud Frappier

IPC: B23K11/11 ,  B23K11/16 ,  B32B15/01

Abstract: A method for resistance spot welding comprising the following successive steps: —providing at least two steel sheets with thickness (th) comprised between 0.5 and 3 mm, at least one of the sheets being a zinc or zinc-alloy coated steel sheet (A) with a tensile strength (TS) higher than 800 MPa and a total elongation (TEL) such as (TS)×(TEL)>14000 MPa %, wherein the composition of the steel substrate of (A) contains, in weight: 0.05%≤C≤0.4%, 0.3%≤Mn≤8%, 0.010%≤Al≤3%, 0.010%≤Si≤2.09%, with 0.5%≤(Si+Al)≤3.5%, 0.001%≤Cr≤1.0%, 0.001%≤Mo≤0.5% and optionally: 0.005%≤Nb≤0.1%, 0.005%≤V≤0.2%, 0.005%≤Ti≤0.1%, 0.0003%≤B≤0.005%, 0.001%≤Ni≤1.0%, the remainder being Fe and unavoidable impurities, —performing resistance spot welding of the at least two steel sheets for producing a weld with an indentation depth (IDepth) on the surface of said steel sheet (A) such as: 100 μm≤(IDepth)≤18.68 (Znsol)−55.1, wherein (IDepth) is in micrometers and wherein Znsol is the solubility of Zn in the steel of sheet (A) at 750° C., in weight %.

公开(公告)号：US20190193187A1

公开(公告)日：2019-06-27

申请号：US16293264

申请日：2019-03-05

Applicant: ArcelorMittal

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

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

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: 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：US09765415B2

公开(公告)日：2017-09-19

申请号：US15374827

申请日：2016-12-09

Applicant: ArcelorMittal France

Inventor： Astrid Perlade ,  Olivier Bouaziz ,  Xavier Garat ,  Josée Drillet ,  Jean-Louis Uriarte

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D8/021 ,  C21D8/0215 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/041 ,  C21D8/0415 ,  C21D8/0426 ,  C21D8/0436 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50

Abstract: A cold-rolled and annealed ferritic steel sheet is provided. The steel has a composition comprising, expressed by weight: 0.001≦C≦0.15%; Mn≦1%; Si≦1.5%; 7.5%≦AI≦10%; 0.020%≦Ti≦0.5%; S≦0.050%; and P≦0.1%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The structure includes kappa (κ) precipitates and equiaxed ferrite, an average grain size dα of the equiaxed ferrite is less than 50 microns, and a linear fraction f of intergranular κ precipitates is less than 30%. The linear fraction f is defined by f = Σ ( A ) ⁢ di Σ ( A ) ⁢ Li . Σ(A)di denotes the total length of grain boundaries containing κ precipitates relative to an area (A) and Σ(A)Li denotes the total length of the grain boundaries relative to the area (A). A content of carbon in solid solution is less than 0.005% by weight, and the cold-rolled and annealed ferritic steel sheet has a thickness between 0.6 mm and 1.5 mm. A skin part or structural part for the automotive field is also provided.

公开(公告)号：US20150147221A1

公开(公告)日：2015-05-28

申请号：US14404750

申请日：2013-05-27

Applicant: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO, S.L.

Inventor： Astrid Perlade ,  Ian Alberto Zuazo Rodriguez ,  Xavier Garat

IPC: C22C38/14 ,  B21B1/46 ,  C22C38/02 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  B21B45/02 ,  B21C47/02

CPC classification number: C22C38/14 ,  B21B1/463 ,  B21B45/0203 ,  B21C47/02 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

Abstract: A rolled steel sheet is provided. The rolled steel sheet has a mechanical strength greater than or equal to 600 MPa and an elongation at fracture that is greater than or equal to 20%. A a method for its fabrication is also provided. The chemical composition of the steel sheet includes 0.10≦C≦0.30%, 6.0≦Mn≦15.0%, 6.0≦Al≦15.0%, and optionally one or more elements selected from among: Si≦2.0%, Ti≦0.2%, V≦0.6% and Nb≦0.3%. The remainder of the composition includes iron and the unavoidable impurities resulting from processing. The ratio of the weight of manganese to the weight of aluminum is such that Mn Al > 1.0 . The microstructure of the sheet includes ferrite, austenite and up to 5% Kappa precipitates in area fraction.

Abstract translation: 提供轧制钢板。 轧制钢板的机械强度大于等于600MPa，断裂伸长率大于等于20％。 还提供了一种其制造方法。 钢板的化学成分包括0.10＆lt; NlE; C＆nlE; 0.30％，6.0＆nlE; Mn＆nlE; 15.0％，6.0＆lt; A1; Al＆amp; 15.0;和任选的一种或多种选自以下的元素：Si＆NlE; 2.0％Ti＆ ％，V＆nlE; 0.6％和Nb＆nlE; 0.3％。 组合物的其余部分包括铁和由加工产生的不可避免的杂质。 锰的重量与铝的重量的比例使得Mn Al> 1.0。 片材的微观结构包括铁素体，奥氏体和面积分数中高达5％的Kappa沉淀物。

公开(公告)号：US12151297B2

公开(公告)日：2024-11-26

申请号：US17961877

申请日：2022-10-07

Applicant: ArcelorMittal

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

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

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：US20230050317A1

公开(公告)日：2023-02-16

申请号：US17961877

申请日：2022-10-07

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

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.