公开(公告)号：US20240102138A1

公开(公告)日：2024-03-28

申请号：US18266682

申请日：2021-12-03

Applicant: ARCELORMITTAL

Inventor： Clément PHILIPPOT ,  Sandra LEGUILLARD ,  David DUSSAUSSOIS ,  Matthieu SALIB

IPC: C22C38/38 ,  B21C47/02 ,  C21D8/02 ,  C21D8/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C22C38/38 ,  B21C47/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0436 ,  C22C38/02 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/0224 ,  C23C2/12 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A coated steel sheet and press hardened steel part having a composition including, by weight percent: C 0.26-0.40%, Mn 0.5-1.8%, Si 0.1-1.25%, Al 0.01-0.1%, Cr 0.1-1.0%, Ti 0.01-0.1%, B 0.001-0.004%, P 0.020%, S 0.010%, N 0.010% the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The press hardened steel part includes a bulk having a microstructure including, in surface fraction, more than 95% of martensite and less than 5% of bainite, a coating layer at the surface of the steel part, a ferritic interdiffusion layer between the coating layer and the bulk, and a ratio between the ferritic grain width in the interdiffusion layer GWint over prior austenite grain size in the bulk PAGSbulk, satisfying following equation (GWint/PAGSbulk)−1≥30%.

公开(公告)号：US20250034684A1

公开(公告)日：2025-01-30

申请号：US18811753

申请日：2024-08-21

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane SERRA ,  Hubert SALMON LEGAGNEUR ,  David DUSSAUSSOIS

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/14 ,  C23C2/12

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. The total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: with 40 ≤ E pc ≤ 80 E pc = ( 33.3 - e IDL 0.9 + e IDL - e coating ) 2 - 148 ⁢ ( e IDL - e coating ) - ( 33.3 - e IDL 0.9 + e IDL - E coating ) The hot-stamped coated steel part comprises an undeformed portion having a thickness ePflat from 0.6 mm to 3.5 mm, and at least one deformed portion. A lineic density of cracks dC in the coating in the undeformed portion is higher than or equal to a minimum lineic density of cracks dCmin(ePflat) defined as: dc min ( e pflat ) - 15.5 + 91 * e - 7.44 - 2.88 * arctan ⁡ ( 5.49 * ( e pflat - 1.71 ) ) - 106.5 * e - 8.62 - 3.34 * arctan ⁡ ( 5.49 * ( e pflat - 1.71 ) )

公开(公告)号：US20250003046A1

公开(公告)日：2025-01-02

申请号：US18800464

申请日：2024-08-12

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane Serra ,  Hubert Salmon Legagneur ,  David Dussaussois

IPC: C23C2/12 ,  B21D22/02 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. the total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: 1 ⁢ 6 ≤ E pc

公开(公告)号：US20250114837A1

公开(公告)日：2025-04-10

申请号：US18757440

申请日：2024-02-09

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane SERRS ,  Hubert SALMON LEGAGNEUR ,  David DUSSAUSSOIS

IPC: B21D22/02 ,  C21D8/02 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C2/12

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. The total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: 4 ⁢ 0 ≤ E p ⁢ c ≤ 80 with E p ⁢ c = ( 3 ⁢ 3 . 3 - e IDL 0 . 9 + e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) 2 - 1 ⁢ 4 ⁢ 8 ⁢ ( e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) - ( 3 ⁢ 3 . 3 - e IDL 0 . 9 + e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) The hot-stamped coated steel part comprises an undeformed portion having a thickness ePflat from 0.6 mm to 3.5 mm, and at least one deformed portion. A lineic density of cracks dC in the coating in the undeformed portion is higher than or equal to a minimum lineic density of cracks dCmin(ePflat) defined as: d ⁢ C min ( e p ⁢ flat ) = 1 ⁢ 5 . 5 + 9 ⁢ 1 * e - 7.44 - 2 . 8 ⁢ 8 * arctan ( 5.49 * ( e pflat - 1.7 1 ) ) - 1 ⁢ 0 6.5 * e - 8.62 - 3 . 3 ⁢ 4 * arctan ( 5.49 * ( e pflat - 1.71 ) )

公开(公告)号：US20250011892A1

公开(公告)日：2025-01-09

申请号：US18706476

申请日：2022-11-02

Applicant: ArcelorMittal

Inventor： Deborah HERRY ,  Fabrice GERMAIN ,  Clément PHILIPPOT ,  Sandra LE GUILLARD

IPC: C21D9/46 ,  B21D22/02 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: Steel sheet suitable for a multistep hot stamping process and associated manufacturing process, the steel sheet having a composition including, by weight percent: C: 0.13-0.4%, Mn: 0.4-4.2%, Si: 0.1-2.5%, Cr≤2%, Mo≤0.65%, Nb≤0.1%, Al≤3.0%, Ti≤0.1%, B≤0.005%, P≤0.025%, S≤0.01%, N≤0.01%, Ni≤2.0%, Ca≤0.1%, W≤0.30%, V≤0.1%, Cu≤0.2%, wherein Q is less than 20, the factor Q being defined as (the elements are expressed in weight percent): Q=114−68*C−18*Mn+20*Si−56*Cr−61*Ni−37*Al+39*Mo+79*Nb−17691*B, the steel sheet having a microstructure including, in surface fraction, from 60% to 100% of recrystallized ferrite, less than 40% of the sum of martensite, bainite and carbides and less than 5% of non-recrystallized ferrite.

公开(公告)号：US20250003045A1

公开(公告)日：2025-01-02

申请号：US18756354

申请日：2024-06-27

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane SERRA ,  Hubert SALMON LEGAGNEUR ,  David DUSSAUSSOIS

IPC: C23C2/12 ,  B21D22/02 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer, the total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: 1 ⁢ 6 ≤ E p ⁢ c

公开(公告)号：US20240002993A1

公开(公告)日：2024-01-04

申请号：US18038104

申请日：2021-12-03

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Alice DUMONT ,  Deborah HERRY ,  Martin BEAUVAIS

IPC: C23C2/12 ,  C22C38/38 ,  C22C38/28 ,  C22C38/00 ,  C22C38/32 ,  C22C38/02 ,  C22C38/06 ,  C21D8/02 ,  C21D1/02 ,  C23C2/40 ,  B21C47/02 ,  C21D1/673 ,  C23C2/02 ,  C23G1/08

CPC classification number: C23C2/12 ,  C22C38/38 ,  C22C38/28 ,  C22C38/001 ,  C22C38/002 ,  C22C38/32 ,  C22C38/02 ,  C22C38/06 ,  C21D8/0257 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0273 ,  C21D1/02 ,  C23C2/40 ,  B21C47/02 ,  C21D1/673 ,  C21D8/0278 ,  C23C2/024 ,  C23G1/08 ,  C21D2211/008 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/001

Abstract: A coated steel sheet and press hardened steel part having a composition including, by weight percent: C 0.15-0.25%, Mn 0.5-1.8%, Si 0.1-1.25%, Al 0.01-0.1%, Cr 0.1-1.0%, Ti 0.01-0.1%, B 0.001-0.004%, P≤0.020%, S≤0.010%, N≤0.010% the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The press hardened steel part includes a bulk having a microstructure including, in surface fraction, more than 95% of martensite and less than 5% of bainite, a coating layer at the surface of the steel part, a ferritic interdiffusion layer between the coating layer and the bulk, and a ratio between the ferritic grain width in the interdiffusion layer GWint over prior austenite grain size in the bulk PAGSbulk, satisfying following equation (GWint/PAGSbulk)−1≥30%.