公开(公告)号：US20210087646A1

公开(公告)日：2021-03-25

申请号：US16954510

申请日：2018-12-18

Applicant: ArcelorMittal

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

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

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：US20200347471A1

公开(公告)日：2020-11-05

申请号：US16765207

申请日：2018-11-21

Applicant: ArcelorMittal

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

IPC: C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C23C2/06 ,  C23C2/12 ,  B23K20/12

Abstract: A cold-rolled and heat-treated steel sheet having a microstructure 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 Austenite islands having a size above 0.5 μm, at most 10% of fresh martensite and recovered martensite containing precipitates of at least one element chosen among niobium, titanium and vanadium. A manufacturing method thereof is also provided.

公开(公告)号：US20250043407A1

公开(公告)日：2025-02-06

申请号：US18710776

申请日：2022-10-17

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Jean-Michel MATAIGNE ,  Jonas STAUDTE

IPC: C23C2/02 ,  B32B15/01 ,  C21D3/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06

Abstract: A steel sheet containing manganese from 3.0 to 6.0% in weight which has both a good coatability by liquid zinc and a good LME resistance. The present invention also aims to make available an easy to implement method to obtain the steel sheet and an assembly which does not have LME issues after spot-welding.

公开(公告)号：US20230287548A1

公开(公告)日：2023-09-14

申请号：US18016799

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Michael STOLTZ

IPC: C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

CPC classification number: C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D6/005 ,  C21D6/008 ,  C21D2211/005 ,  C21D2211/001 ,  C21D2211/008 ,  C21D2211/004

Abstract: A cold rolled, annealed and tempered steel sheet, made of a steel having a composition including, by weight percent: C: 0.03-0.18%, Mn: 6.0-11.0%, Al:

公开(公告)号：US20230203616A1

公开(公告)日：2023-06-29

申请号：US18177108

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：US20230151452A1

公开(公告)日：2023-05-18

申请号：US18097492

申请日：2023-01-16

Applicant: ArcelorMittal

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

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/32 ,  C23C2/06 ,  C23C2/12

CPC classification number: C21D9/46 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/32 ,  C23C2/06 ,  C23C2/12 ,  C21D2211/001 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/008

Abstract: A cold-rolled and heat treated steel sheet, has a composition comprising 0.1% ≤ C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤ 3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1 %, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 µm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.

公开(公告)号：US20220290265A1

公开(公告)日：2022-09-15

申请号：US17745811

申请日：2022-05-16

Applicant: ArcelorMittal

Inventor： Coralie MAGAR ,  Kangying ZHU ,  Astrid PERLADE

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

Abstract: A cold-rolled and heat-treated steel sheet, having a composition comprising, 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 amongst 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%, A remainder of the composition being iron and unavoidable impurities resulting from the smelting. The microstructure consists of, in surface fraction, between 10% and 50% of retained austenite, at most 8% of fresh martensite, and tempered martensite. The retained austenite comprises Mn-enriched austenite, having a Mn content higher than 1.3*Mn %, Mn % designating the Mn content of the steel sheet, the surface fraction of said Mn-enriched austenite with respect to the whole microstructure being comprised between 2% and 12%; and Mn-poor austenite, having a Mn content comprised between 0.5*Mn % and 1.3*Mn %.

公开(公告)号：US20230295782A1

公开(公告)日：2023-09-21

申请号：US18016837

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG ,  Michael STOLTZ

IPC: C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  B32B7/05 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  F16B5/08

CPC classification number: C22C38/14 ,  B32B7/05 ,  B32B15/011 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  F16B5/08

Abstract: A cold rolled, annealed and partitioned steel sheet, made of a steel having a composition including, by weight percent: C: 0.05 - 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：US20230295781A1

公开(公告)日：2023-09-21

申请号：US18016595

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Coralie JUNG

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

CPC classification number: C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  B32B7/05 ,  B32B15/011 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  B32B2250/02 ,  B32B2311/30

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 5% to 50% of ferrite, from 5 to 70% of partitioned martensite 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]A2×[Mn]A)/(C %2×Mn %) is from 3.0 to 8.0, C % and Mn % being the nominal values in carbon and manganese in weight % and an inhomogeneous repartition of manganese characterized by a manganese distribution with a slope above or equal to −40.

公开(公告)号：US20230295757A1

公开(公告)日：2023-09-21

申请号：US18016572

申请日：2021-07-12

Applicant: ArcelorMittal

Inventor： Astrid PERLADE ,  Kangying ZHU ,  Frédéric KEGEL

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

CPC classification number: C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  C22C38/12 ,  C21D2211/005 ,  C21D2211/001 ,  C21D2211/008

Abstract: A cold rolled and double annealed steel sheet, made of a steel having a composition including, by weight percent: C: 0.03-0.18%, Mn: 6.0-11.0%, 0.2≤Al