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1.发明公开公开(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%.
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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
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 ) )
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公开(公告)号：US20210395853A1
公开(公告)日：2021-12-23
申请号：US17463128
申请日：2021-08-31
Applicant: ArcelorMittal
Inventor： Tiago MACHADO AMORIM , Christian ALLELY , Raisa GRIGORIEVA , David DUSSAUSSOIS
IPC: C21D9/46 , B32B15/01 , C23C2/12 , C23C2/28 , C22C21/10 , C23C2/40 , C23C2/26 , C21D1/673 , C22C21/02 , B21D22/02 , C21D6/00 , C21D8/00
Abstract: A hot formed pre-coated steel part includes a steel sheet precoated with a metallic coating and hot formed, the coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; and a ratio Al/Zn by weight greater than 2.9, where a microstructure in the steel after said hot forming being martensitic or martensitic-bainitic or made of at least 75% of equiaxed ferrite, 5 to 20% of martensite and bainite in an amount less than or equal to 10%.
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公开(公告)号：US20210395855A1
公开(公告)日：2021-12-23
申请号：US17463187
申请日：2021-08-31
Applicant: ArcelorMittal
Inventor： Tiago MACHADO AMORIM , Christian ALLELY , Raisa GRIGORIEVA , David DUSSAUSSOIS
IPC: C21D9/46 , B32B15/01 , C23C2/12 , C23C2/28 , C22C21/10 , C23C2/40 , C23C2/26 , C21D1/673 , C22C21/02 , B21D22/02 , C21D6/00 , C21D8/00
Abstract: A method for manufacture of a pre-coated steel sheet includes providing a steel sheet, coating the steel sheet with a metallic coating, the metallic coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance of the metallic coating being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; a ratio Al/Zn by weight greater than 2.9, and wherein the metallic coating does not include In and the metallic coating does not include Sn
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Patent Agency Ranking
公开(公告)号：US20210395854A1
公开(公告)日：2021-12-23
申请号：US17463142
申请日：2021-08-31
Applicant: ArcelorMittal
Inventor： Tiago MACHADO AMORIM , Christian ALLELY , Raisa GRIGORIEVA , David DUSSAUSSOIS
IPC: C21D9/46 , B32B15/01 , C23C2/12 , C23C2/28 , C22C21/10 , C23C2/40 , C23C2/26 , C21D1/673 , C22C21/02 , B21D22/02 , C21D6/00 , C21D8/00
Abstract: A pre-coated steel sheet includes a steel sheet precoated with a metallic coating, the coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; a ratio Al/Zn by weight greater than 2.9, wherein the coating does not include In and the coating does not include Sn.
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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
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 ) )
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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
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公开(公告)号：US20210395856A1
公开(公告)日：2021-12-23
申请号：US17463217
申请日：2021-08-31
Applicant: ArcelorMittal
Inventor： Tiago MACHADO AMORIM , Christian ALLELY , Raisa GRIGORIEVA , David DUSSAUSSOIS
IPC: C21D9/46 , B32B15/01 , C23C2/12 , C23C2/28 , C22C21/10 , C23C2/40 , C23C2/26 , C21D1/673 , C22C21/02 , B21D22/02 , C21D6/00 , C21D8/00
Abstract: A painted steel part includes a steel sheet precoated with a metallic coating and hot formed, the coating including: 2.0 to 24.0% by weight of zinc; 1.1 to 7.0% by weight of silicon; optionally from 0.5 to 3.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr or Hf, a content by weight of each additional element being less than 0.3% by weight, a balance being aluminum, unavoidable impurities and residual elements resulting from feeding ingots or from a passage of the steel sheet in a molten bath; and a ratio Al/Zn by weight greater than 2.9; and a paint layer.
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公开(公告)号：US20180223386A1
公开(公告)日：2018-08-09
申请号：US15748395
申请日：2016-07-11
Applicant: ARCELORMITTAL
Inventor： Tiago MACHADO AMORIM , Christian ALLELY , Raisa GRIGORIEVA , David DUSSAUSSOIS
IPC: C21D9/46 , C22C21/10 , C23C2/12 , C23C2/28 , C23C2/40 , B32B15/01 , C21D8/00 , C21D6/00 , B21D22/02
CPC classification number: C21D9/46 , B21D22/022 , B32B15/012 , C21D1/673 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/005 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C21/02 , C22C21/10 , C23C2/12 , C23C2/26 , C23C2/28 , C23C2/40
Abstract: The present invention provides a method for the manufacture of a hardened part. The method includes the provision of a steel sheet pre-coated with a metallic coating including from 2.0 to 24.0% by weight of zinc, from 1.1 to 7.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium when the amount of silicon is between 1.1 and 4.0%, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and unavoidable impurities and residuals elements, wherein the ratio Al/Zn is above 2.9. The method further includes the cutting of the coated steel sheet to obtain a blank, the thermal treatment of the blank at a temperature between 840 and 950° C. to obtain a fully austenitic microstructure in the steel, the transfer of the blank into a press tool, the hot-forming of the blank to obtain a part, the cooling of the part in order to obtain a microstructure in steel being martensitic or martensitic-bainitic or made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.
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