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

IPC: C21D7/13 ,  C21D8/02 ,  C23C2/12 ,  C23C2/28 ,  C23C14/35

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).

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

IPC: C21D1/18 ,  C21D1/26 ,  C21D1/76 ,  C21D8/02 ,  C21D9/48 ,  C23C2/06 ,  C23C2/12

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).

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

IPC: C21D9/46 ,  C21D8/02 ,  C21D7/13 ,  C21D1/74 ,  B32B15/01 ,  B21D22/02

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).

公开(公告)号：US20190144963A1

公开(公告)日：2019-05-16

申请号：US16097466

申请日：2017-04-26

Applicant: ARCELORMITTAL

Inventor： Cédric GEORGES ,  Florin DUMINICA ,  Thierry STUREL ,  Pascal DRILLET

IPC: C21D8/04 ,  B32B15/01 ,  C21D6/00 ,  C23C2/12 ,  C23C14/16 ,  C23C28/02

Abstract: A carbon steel sheet coated with a barrier pre-coating containing nickel and chromium in a weight ratio between 1.5 and 9, and a press hardening method for providing the carbon steel sheet coated with a barrier pre-coating comprising nickel and chromium are described.

公开(公告)号：US20250003023A1

公开(公告)日：2025-01-02

申请号：US18882017

申请日：2024-09-11

Applicant: ARCELORMITTAL

Inventor： Alexandre BLAISE ,  Pascal DRILLET ,  Thierry STUREL

IPC: C21D9/48 ,  C21D1/673 ,  C21D8/04 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

Abstract: A non-stamped prealloyed steel coil, sheet or blank includes a heat-treatable steel substrate covered by an alloyed precoating containing aluminum and iron, aluminum not being present as free aluminum; and an interdiffusion layer at an interface between the steel substrate and the precoating, with a thickness between 2 and 16 micrometers, the interdiffusion layer being a layer with an α(Fe) ferritic structure, having Al and Si in solid solution.

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

IPC: C23C28/02 ,  C21D8/02 ,  C21D9/46

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).

公开(公告)号：US20220025480A1

公开(公告)日：2022-01-27

申请号：US17311677

申请日：2018-12-18

Applicant: ArcelorMittal

Inventor： Blandine REMY ,  Thierry STUREL ,  Emmanuel LUCAS ,  Gianni BOI

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21D22/02

Abstract: A press hardened coated steel part with high resistance to delayed fracture, the coating containing (Fex—Aly) intermetallic compounds resulting from the diffusion of iron into an aluminum or an aluminum-based alloy, or an aluminum alloy of a precoating, wherein the chemical composition of the steel includes, in weight: 0.16%≤C≤0.42%, 0.1%≤Mn≤3%, 0.07%≤Si≤1.60%, 0.002%≤Al≤0.070%, 0.02%≤Cr≤1.0%, 0.0005≤B≤0.005%, 0.002%≤Mg≤0.007%, 0.002%≤Ti≤0.11%, 0.0008%≤O≤0.005%, wherein (Ti)×(O)2×107≤2, 0.001%≤N≤0.007%, 0.001%≤S≤0.005%, 0.001%≤P≤0.025% and optionally one or more elements selected from the list of: 0.005%≤Ni≤0.23%, 0.005%≤Nb≤0.060%, the remainder being Fe and unavoidable impurities, and wherein the microstructure includes at least 95% martensite.