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公开(公告)号：US20220380863A1
公开(公告)日：2022-12-01
申请号：US17771908
申请日：2020-10-20
Applicant: ArcelorMittal
Inventor： Raisa GRIGORIEVA , Florin DUMINICA , Brahim NABI , Pascal DRILLET , Thierry STUREL
Abstract: A press hardening method including the following steps: A. the provision of a steel sheet for heat treatment being optionally coated with a zinc- or aluminum-based pre-coating, B. the flexible rolling of the steel sheet in the rolling direction so as to obtain a steel sheet having a variable thickness, C. the cutting of the rolled steel sheet to obtain a tailored rolled blank, D. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, E. the heat treatment of the tailored rolled blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the tailored rolled blank into a press tool, G. the hot-forming of the tailored rolled blank to obtain a part having a variable thickness,H. the cooling of the part having a variable thickness obtained at step G).
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公开(公告)号：US20220396845A1
公开(公告)日：2022-12-15
申请号：US17771862
申请日：2020-10-20
Applicant: ArcelorMittal
Inventor： Raisa GRIGORIEVA , Florin DUMINICA , Brahim NABI , Pascal DRILLET , Thierry STUREL
Abstract: press hardening method includes the following steps: A. the provision of a steel sheet for heat-treatment, precoated with a zinc- or aluminum-based pre-coating, B. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, and comprising at least one element chosen from among: nickel, chromium, magnesium, aluminum and yttrium, C. batch annealing of the precoated steel sheet to obtain a pre-alloyed steel sheet, the cooling after the batch annealing being performed at a speed of 29.0° C.h−1 or less, D. the cutting of the pre-alloyed steel sheet to obtain blank, E. thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the blank into a press tool, G. the hot-forming of the blank to obtain a part, H. the cooling of the part obtained at step G).
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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：US20220380905A1
公开(公告)日：2022-12-01
申请号：US17771892
申请日：2020-10-20
Applicant: ArcelorMittal
Inventor： Raisa GRIGORIEVA , Florin DUMINICA , Brahim NABI , Pascal DRILLET , Thierry STUREL
Abstract: A press hardening method including: A. provision of a steel sheet for heat treatment, being optionally precoated with a zinc- or aluminum-based pre-coating, B. deposition of a hydrogen barrier pre-coating comprising chromium and not comprising nickel over a thickness from 10 to 550 nm, C. cutting of the precoated steel sheet to obtain a blank, D. heat treatment of the blank at a furnace temperature from 800 to 970° C., during a dwell time from 1 to 12 minutes, in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1% by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, such atmosphere having a dew point between −30 and +30° C., E. transfer of the blank into a press tool, F. hot-forming at a temperature from 600 to 830° C. to obtain a part, G. cooling of the part obtained at step E).
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Patent Agency Ranking
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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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：US20220380861A1
公开(公告)日：2022-12-01
申请号：US17771874
申请日：2020-10-20
Applicant: ArcelorMittal
Inventor： Raisa GRIGORIEVA , Florin DUMINICA , Brahim NABI , Pascal DRILLET , Thierry STUREL
Abstract: A press hardening method includes the following steps: A. the provision of a steel sheet for heat treatment, precoated with a zinc- or aluminum-based pre-coating for anti-corrosion purpose, B. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, C. the batch annealing of the precoated steel sheet in an inert atmosphere to obtain a pre-alloyed steel sheet, D. the cutting of the pre-alloyed steel sheet to obtain blank, E. the thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the blank into a press tool, G. the hot-forming of the blank to obtain a part, H. the cooling of the part obtained at step G).
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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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