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.

公开(公告)号：US20230175104A1

公开(公告)日：2023-06-08

申请号：US18016396

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL ,  Blandine REMY

IPC: C22C38/04 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

CPC classification number: C22C38/04 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/008 ,  C21D6/005 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C21D8/0226 ,  B23K11/11

Abstract: A cold rolled and annealed steel sheet, made of a steel having a composition including, by weight percent



C: 0.03-0.18%
Mn: 6.0-11.0%
Al: 0.2-3%
Mo: 0.05-0.5%
B: 0.0005-0.005%
S≤0.010%
P≤0.020%
N≤0.008%
and including optionally one or more of the following elements, in weight percentage:
Si≤1.20%
Ti≤0.050%
Nb≤0.050%
Cr≤0.5%
V≤0.2%
the remainder of the composition being iron and unavoidable impurities resulting from the smelting, the steel sheet having a microstructure including, in surface fraction,

from 30% to 55% of retained austenite,
from 45% to 70% of ferrite,
less than 5% of fresh martensite
a carbon [C]A and manganese [Mn]A content in austenite, expressed in weight percent, satisfying








[C]A*[Mn]A/((0.1+C %2)*(Mn %+2))≥1.10





and an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to −30.

公开(公告)号：US20190276910A1

公开(公告)日：2019-09-12

申请号：US16302988

申请日：2017-05-23

Applicant: ARCELORMITTAL

Inventor： Jean-Christophe HELL ,  Nicolas CHARBONNIER ,  Thierry IUNG ,  Blandine REMY

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/58 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46

Abstract: A method for manufacturing a recovered steel sheet having an austenitic matrix presenting at least one mechanical property (M) equal or above a target value Mtarget is provided. The method includes a calibrating process involving heat on at least 2 samples of the steel, corresponding to Pareq values P, submitting said samples to X-ray diffraction so as to obtain spectrums including a main peak whose width at mid height FWHM is being measured, measuring a mechanical property (M) of said samples, measuring a recovery or recrystallization state of each sample, drawing a curve of M as a function of FWMH in a domain where the samples are recovered from 0 to 100%, but not recrystallized. The method further includes calculating a FWHMtarget corresponding to a target mechanical property Mtarget, determining a pareq value Ptarget of the heat treatment to perform to reach Mtarget and selecting a time ttarget and a temperature T°target corresponding to the Ptarget value. The method further includes feeding a recrystallized steel sheet having a Mrecrystallization, cold-rolling the recrystallized steel sheet in order to obtain a steel sheet having a Mcold-roll and annealing the cold rolled steel sheet at a temperature T°target during a time ttarget.

公开(公告)号：US20230287547A1

公开(公告)日：2023-09-14

申请号：US18016733

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL ,  Blandine REMY

IPC: C22C38/14 ,  B32B7/05 ,  B32B15/01 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

CPC classification number: C22C38/14 ,  B32B7/05 ,  B32B15/011 ,  C22C38/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D6/005 ,  C21D2211/005 ,  C21D2211/001 ,  C21D2211/008 ,  C21D2211/004

Abstract: A hot rolled and heat-treated steel sheet, made of a steel having a composition including, by weight percent: C: 0.03-0.18%, Mn: 6.0-11.0%, Mo: 0.05-0.5%, B: 0.0005-0.005%, S≤0.010%, P≤0.020%, N≤0.008%, and including optionally one or more of the following elements, in weight percentage: Al

公开(公告)号：US20190292616A1

公开(公告)日：2019-09-26

申请号：US16302969

申请日：2017-05-19

Applicant: ARCELORMITTAL

Inventor： Colin Scott ,  Blandine REMY

IPC: C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/16 ,  C22C38/12 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C21D9/46 ,  C22C38/20 ,  C22C38/24 ,  C22C38/28 ,  C22C38/38

Abstract: A TWIP steel sheet is provided having an austenitic matrix including by weight: 0.1≤C≤1.2%, 13.0≤Mn 0.25%, and on a purely optional basis, one or more of Nb≤0.5%, B≤0.005%, Cr≤1.0%, Mo≤0.40%, Ni≤1.0%, Ti≤0.5%, and/or 0.06≤Sn≤0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from elaboration.