公开(公告)号：US12270087B2

公开(公告)日：2025-04-08

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 ,  C23C2/26 ,  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：US20220017987A1

公开(公告)日：2022-01-20

申请号：US17491785

申请日：2021-10-01

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/02 ,  C21D1/673 ,  C21D8/02 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/21 ,  B21B1/22 ,  C21D6/00 ,  C22C38/22 ,  C23C2/12

Abstract: A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

公开(公告)号：US20180202017A1

公开(公告)日：2018-07-19

申请号：US15741290

申请日：2016-06-10

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/12 ,  B32B15/01 ,  B23K26/21 ,  B21B1/22 ,  B21D22/02

Abstract: A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

公开(公告)号：US12110572B2

公开(公告)日：2024-10-08

申请号：US16968880

申请日：2019-03-05

Applicant: ARCELORMITTAL

Inventor： Alexandre Blaise ,  Pascal Drillet ,  Thierry Sturel

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

CPC classification number: C21D9/48 ,  C21D1/673 ,  C21D8/0484 ,  C23C2/12 ,  C23C2/261 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/005 ,  C21D2211/009

Abstract: A process for manufacturing a non-stamped prealloyed steel coil, sheet or blank, comprising the following successive steps of: providing a non-stamped precoated steel coil, sheet or blank composed of a steel substrate covered by a precoating of aluminum, or aluminum-based alloy, or aluminum alloy, wherein the precoating thickness is comprised between 10 and 35 micrometers on each side of the steel coil, sheet or blank, then heating the non-stamped steel coil, sheet or blank in a furnace under an atmosphere containing at least 5% oxygen, up to a temperature θ1 comprised between 750 and 1000° C., for a duration t1 comprised between t1min and t1max, wherein: t1min=23500/(θ1−729.5) and t1max=4.946×1041×θ1−13.08, t1 designating the total duration in the furnace, θ1 being expressed in ° C. and t1min and t1max being expressed in seconds, then cooling the non-stamped steel coil, sheet or blank at a cooling rate Vr1 down to a temperature θi, then maintaining the non-stamped steel coil, sheet or blank at a temperature θ2 comprised between 100 and 500° C., for a duration t2 comprised between 3 and 45 minutes, so to obtain a diffusible hydrogen less than 0.35 ppm.

公开(公告)号：US11041226B2

公开(公告)日：2021-06-22

申请号：US16413825

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Dominique Spehner ,  Ronald Kefferstein

IPC: B32B15/01 ,  C21D9/46 ,  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：US10577674B2

公开(公告)日：2020-03-03

申请号：US16413729

申请日：2019-05-16

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Dominique Spehner ,  Ronald Kefferstein

IPC: B32B15/01 ,  C21D9/46 ,  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：US10550447B2

公开(公告)日：2020-02-04

申请号：US15606770

申请日：2017-05-26

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Dominique Spehner ,  Ronald Kefferstein

IPC: B32B15/01 ,  C21D9/46 ,  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：US10214792B2

公开(公告)日：2019-02-26

申请号：US14575475

申请日：2014-12-18

Applicant: ARCELORMITTAL FRANCE

Inventor： Pascal Drillet ,  Damien Ormston

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

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%.

公开(公告)号：US12281366B2

公开(公告)日：2025-04-22

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 ,  C23C2/26 ,  C23C2/28

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：US10961602B2

公开(公告)日：2021-03-30

申请号：US16413799

申请日：2019-05-16

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.