公开(公告)号：US20240287638A1

公开(公告)日：2024-08-29

申请号：US18573247

申请日：2021-07-16

Applicant: ArcelorMittal

Inventor： Pierrick FORT ,  Aude NADLER ,  Kangying ZHU ,  Astrid PERLADE ,  Michel SOLER ,  Frédéric KEGEL

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

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2261/00

Abstract: A process for manufacturing a steel part, including the following successive steps: providing a steel sheet having a composition including by weight percent: C: 0.05—0.25%, Mn: 3.5-8%, Si 0.1-2%, Al: 0.01-3%, S≤0.010%, P≤0.020%, N≤0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure, in surface fraction, between 10% and 50% of retained austenite, 50% or more of the sum of ferrite, bainite and tempered martensite, less than 5% of fresh martensite, less than 2% of carbides and a carbon [C]A content in austenite, strictly more than 0.4% and strictly less than 0.7%, cutting the steel sheet to a predetermined shape, to obtain a steel blank, heating the steel blank to a temperature Twarm from (Md30-150° C.) to (Md30-50° C.), punching or shearing and forming the heat-treated steel blank at the Twarm temperature to obtain a steel part.

公开(公告)号：US20230416864A1

公开(公告)日：2023-12-28

申请号：US18242666

申请日：2023-09-06

Applicant: ArcelorMittal

Inventor： Coralie JUNG ,  Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL

IPC: C21D9/46 ,  B23K11/16 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40

CPC classification number: C21D9/46 ,  B23K11/16 ,  B32B15/012 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  B23K2101/006

Abstract: A cold-rolled and heat-treated steel sheet, has a composition comprising, by weight percent: n0.10%≤C≤0.25%, 3.5%≤Mn≤6.0%, 0.5%≤Si≤2.0%, 0.3%≤Al≤1.2%, with Si+Al≥0.8%, 0.10%≤Mo≤0.50%, S≤0.010%, P≤0.020%, N≤0.008%. The cold-rolled steel sheet has a microstructure consisting of, in surface fraction: between 10% and 45% of ferrite, having an average grain size of at most 1.3 μm, the product of the surface fraction of ferrite by the average grain size of the ferrite being of at most 35 μm %, between 8% and 30% of retained austenite, the retained austenite having an Mn content higher than 1.1*Mn %, Mn % designating the Mn content of the steel, at most 8% of fresh martensite, at most 2.5% of cementite and partitioned martensite.

公开(公告)号：US20230027001A1

公开(公告)日：2023-01-26

申请号：US17784812

申请日：2020-12-17

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Frederic KEGEL

IPC: C22C38/04 ,  C22C38/02 ,  C22C38/26 ,  C22C38/28 ,  C22C38/22 ,  C22C38/06 ,  C22C38/38 ,  C21D8/02

Abstract: A hot rolled steel sheet having a composition including, by weight percent:C:0.10-0.25%, Mn:3.5-5.0%, Si:0.80-1.60%, B:0.0003-0.004%, S≤0.010%, P≤0.020%, N≤0.008% the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 50% and 80% of lath bainite, lower than 30% of granular bainite, the rest being martensite, martensite-austenite islands and austenite films, and having less than 20% of martensite and M-A islands having the multiplication of the maximum length Lmax of the grain by the maximum width Wmax of the grain higher than 1 μm2.

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：US20230279528A1

公开(公告)日：2023-09-07

申请号：US18016543

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL

IPC: C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  F16B5/08

CPC classification number: C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D6/005 ,  F16B5/08 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  B32B15/011

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 25% to 55% of retained austenite, from 45% to 75% of ferrite, less than 5% of fresh martensite, a carbon [C]A and manganese [Mn]A content in austenite, expressed in weight percent, such that the ratio ([C]A×[Mn]2A)/(C %×Mn %) is from 19.0 to 41.0 wt %, C % and Mn % being the nominal values in carbon and manganese in weight % and a carbides density below 3×106/mm2 and—an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to −30.

公开(公告)号：US20230272498A1

公开(公告)日：2023-08-31

申请号：US18016403

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/00

CPC classification number: C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/001 ,  C22C38/002 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008

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 25% to 54% of retained austenite, from 46% to 75% of ferrite, less than 8% of fresh martensite, a carbon [C]A and manganese [Mn]A content in austenite, expressed in weight percent, wherein [C]A*√[Mn]A is from 0.48 to 1.8, and an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to −50.

公开(公告)号：US20200370141A1

公开(公告)日：2020-11-26

申请号：US16766328

申请日：2018-11-21

Applicant: ArcelorMittal

Inventor： Kangying ZHU ,  Astrid PERLADE ,  Coralie JUNG ,  Frederic KEGEL

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  B23K11/11 ,  B23K11/16

Abstract: A cold-rolled and heat-treated steel sheet-having a microstructure consisting of, in surface fraction: between 10% and 30% of retained austenite, said retained austenite being present as films having an aspect ratio of at least 3 and as Martensite Austenite islands, less than 8% of such Martensite A islands having a size above 0.5 μm, at most 1% of fresh martensite at most 50% of tempered martensite and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. It also provides a manufacturing method thereof.

公开(公告)号：US20230203617A1

公开(公告)日：2023-06-29

申请号：US18177109

申请日：2023-03-01

Applicant: ArcelorMittal

Inventor： Martin BEAUVAIS ,  Alice DUMONT ,  Alexandre GIBOT ,  Astrid PERLADE ,  Kangying ZHU

IPC: C21D9/50 ,  B32B15/01 ,  C21D6/00 ,  C21D8/04 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

CPC classification number: C21D9/50 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0405 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0463 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B32B2605/00 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008

Abstract: A steel sheet for the manufacture of a press hardened part is provided, having a composition of: 0.15%≤C≤0.22%, 3.5%≤Mn

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：US20210115528A1

公开(公告)日：2021-04-22

申请号：US16332619

申请日：2017-09-15

Applicant: ArcelorMittal

Inventor： Coralie MAGAR ,  Kangying ZHU ,  Astrid PERLADE

IPC: C21D8/02 ,  C21D1/18 ,  C21D9/46 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  B23K11/11

Abstract: A cold-rolled and heat-treated steel sheet, having a composition including, by weight percent: 0.10%≤C≤0.40%, 3.5%≤Mn≤8.0%, 0.5%≤Si≤2.5%, 0.003%≤Al≤3.0%, with Si+Al≥0.8%, 0.001%≤Mo≤0.5%, S≤0.010%, P≤0.020%, N≤0.008%, and optionally one or more elements selected from a group comprising Cr, Ti, Nb, V and B, such that: 0.01%≤Cr≤2.0%, 0.010%≤Ti≤0.080%, 0.010%≤Nb≤0.080%, 0.010%≤V≤0.30%, 0.0005%≤B≤0.003%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The microstructure includes, in surface fraction, between 10% and 50% of retained austenite, at most 8% of fresh martensite, and tempered martensite. The retained austenite includes Mn-enriched austenite, having a Mn content higher than 1.3*Mn %, Mn % designating the Mn content of the steel sheet, a surface fraction of the Mn-enriched austenite with respect to the whole microstructure is between 2% and 12%, and Mn-poor austenite, having an Mn content between 0.5*Mn % and 1.3*Mn %.