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：US20210262055A1

公开(公告)日：2021-08-26

申请号：US17319306

申请日：2021-05-13

Applicant: ArcelorMittal

Inventor： Pascal DRILLET ,  Dominique Spehner ,  Ronald Kefferstein

IPC: C21D9/46 ,  B32B15/01 ,  C23C2/12 ,  C23C2/26 ,  C23C2/40

Abstract: A pre-coated steel strip is provided. The steel strip includes a strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness tp of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.

公开(公告)号：US20190271058A1

公开(公告)日：2019-09-05

申请号：US16414022

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal DRILLET ,  Dominique Spehner ,  Ronald Kefferstein

IPC: C21D9/46 ,  C23C2/40 ,  C23C2/26 ,  C23C2/12 ,  B32B15/01

Abstract: A pre-coated steel strip is provided. The steel strip includes a strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness tp of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.

公开(公告)号：US20180148806A1

公开(公告)日：2018-05-31

申请号：US15879944

申请日：2018-01-25

Applicant: ArcelorMittal France

Inventor： Pascal DRILLET ,  Damien ORMSTON

IPC: C21D8/02 ,  C23C2/12 ,  C23C2/06 ,  C21D6/00 ,  C23C2/02 ,  C22C38/38 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46

CPC classification number: C21D8/0263 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  Y10T428/12757 ,  Y10T428/12799

Abstract: A hot-rolled steel sheet having a tensile strength greater than 800 MPa and an elongation at break greater than 10% is provided. A composition of the steel includes, the contents being expressed by weight: 0.050%≤C≤0.090%, 1%≤Mn≤2%, 0.015%≤Al≤0.050%, 0.1%≤Si≤0.3%, 0.10%≤Mo≤0.40%, S≤0.010%, P≤0.025%, 0.003%≤N≤0.009%, 0.12%≤V≤0.22%, Ti≤0.005%, Nb≤0.020% and optionally, Cr≤0.45%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. A microstructure of the sheet or part includes, as a surface fraction, at least 80% upper bainite, and a remainder includes lower bainite, martensite and residual austenite. A sum of the martensite and residual austenite, as a surface fraction, is less than 5%.

公开(公告)号：US20190276912A1

公开(公告)日：2019-09-12

申请号：US16413729

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal DRILLET ,  Dominique Spehner ,  Ronald Kefferstein

IPC: C21D9/46 ,  C23C2/40 ,  C23C2/26 ,  C23C2/12 ,  B32B15/01

Abstract: A pre-coated steel strip is provided. The steel strip includes a strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness tp of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.

公开(公告)号：US20190271055A1

公开(公告)日：2019-09-05

申请号：US16413774

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal DRILLET ,  Dominique Spehner ,  Ronald Kefferstein

IPC: C21D9/46 ,  C23C2/40 ,  C23C2/26 ,  C23C2/12 ,  B32B15/01

Abstract: A pre-coated steel strip is provided. The steel strip includes a strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness tp of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.

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：US20190271057A1

公开(公告)日：2019-09-05

申请号：US16413825

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal DRILLET ,  Dominique Spehner ,  Ronald Kefferstein

IPC: C21D9/46 ,  C23C2/40 ,  C23C2/26 ,  C23C2/12 ,  B32B15/01

Abstract: A pre-coated steel strip is provided. The steel strip includesa strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness tp of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.

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：US20180163282A9

公开(公告)日：2018-06-14

申请号：US14575475

申请日：2014-12-18

Applicant: ARCELORMITTAL FRANCE

Inventor： Pascal DRILLET ,  Damien ORMSTON

IPC: C21D8/02 ,  C21D9/46 ,  C21D6/00 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C22C38/38 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D8/0263 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  Y10T428/12757 ,  Y10T428/12799

Abstract: The invention relates to a hot-rolled steel sheet having a tensile strength greater than 800 MPa and an elongation at break greater than 10%, the composition of which comprises, the contents being expressed by weight: 0.050%≤C≤0.090%, 1%≤Mn≤2%, 0.015%≤Al≤0.050%, 0.1%≤Si≤0.3%, 0.10%≤Mo≤0.40%, S≤0.010%, P≤0.025%, 0.003%≤N≤0.009%, 0.12%≤V≤0.22%, Ti≤0.005%, Nb≤0.020% and, optionally, Cr≤0.45%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the sheet or the part comprising, as a surface fraction, at least 80% upper bainite, the possible complement consisting of lower bainite, martensite and residual austenite, the sum of the martensite and residual austenite contents being less than 5%.