公开(公告)号：US11618931B2

公开(公告)日：2023-04-04

申请号：US15322947

申请日：2015-07-03

Applicant: ArcelorMittal

Inventor： Rashmi Ranjan Mohanty ,  Hyun Jo Jun ,  Dongwei Fan

IPC: C21D9/46 ,  C21D1/26 ,  C21D1/25 ,  C22C38/06 ,  C22C38/02 ,  C22C38/28 ,  C22C38/26 ,  C21D6/00 ,  C22C38/38 ,  C22C38/34 ,  C21D9/48 ,  C21D8/02 ,  C21D1/19 ,  C21D8/04

Abstract: A method for producing a high strength steel sheet having a yield strength YS of at least 850 MPa, a tensile strength TS of at least 1180 MPa, a total elongation of at least 14% and a hole expansion ratio HER of at least 30%. The chemical composition of the steel contains: 0.15%≤C≤0.25%, 1.2%≤Si≤1.8%, 2%≤Mn≤2.4%, 0.1%≤Cr≤0.25%, Nb≤0.05%, Ti≤0.05%, Al≤0.50%, the remainder being Fe and unavoidable impurities. The sheet is annealed at an annealing temperature TA higher than Ac3 but less than 1000° C. for more than 30 s, by cooling it to a quenching temperature QT between 275° C. and 325° C., at a cooling speed sufficient to have, just after quenching, a structure consisting of austenite and at least 50% of martensite, the austenite content en.) being such that the final structure can contain between 3% and 15% of residual austenite and between 85 and 97% of the sum of martensite and bainite, without ferrite, heated to a partitioning temperature PT between 420° C. and 470° C. and maintained at this temperature for time between 50 s and 150 s and cooled to the room temperature.

公开(公告)号：US10131974B2

公开(公告)日：2018-11-20

申请号：US14361292

申请日：2012-11-28

Applicant: ARCELORMITTAL

Inventor： Hyun Jo Jun ,  Narayan S. Pottore ,  Nina Michailovna Fonstein

IPC: C22C38/00 ,  C22C38/02 ,  C22C38/12 ,  C22C38/04 ,  C22C38/06 ,  C21D9/40

Abstract: A dual phase steel (martensite+ferrite) having a tensile strength of at least 980 MPa, and a total elongation of at least 15%. The dual phase steel may have a total elongation of at least 18%. The dual phase steel may also have a tensile strength of at least 1180 MPa. The dual phase steel may include between 0.5-3.5 wt. % Si, and more preferably between 1.5-2.5 wt. % Si.

公开(公告)号：US20150267280A1

公开(公告)日：2015-09-24

申请号：US14361292

申请日：2012-11-28

Applicant: ARCELORMITTAL INVESTIGACION Y DESARROLLO SL

Inventor： Hyun Jo Jun ,  Narayan Subramaniam Pottore ,  Nina Michailovna Fonstein

IPC: C22C38/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04

CPC classification number: C22C38/12 ,  C21D9/40 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A dual phase steel (martensite+ferrite) having a tensile strength of at least 980 MPa, and a total elongation of at least 15%. The dual phase steel may have a total elongation of at least 18%. The dual phase steel may also have a tensile strength of at least 1180 MPa. The dual phase steel may include between 0.5-3.5 wt. % Si, and more preferably between 1.5-2.5 wt. % Si.

Abstract translation: 拉伸强度为980MPa，总伸长率为15％以上的双相钢（马氏体+铁素体）。 双相钢可以具有至少18％的总伸长率。 双相钢也可以具有至少1180MPa的拉伸强度。 双相钢可以包括0.5-3.5重量％ ％Si，更优选在1.5-2.5wt。 ％Si。

公开(公告)号：US11047020B2

公开(公告)日：2021-06-29

申请号：US16398873

申请日：2019-04-30

Applicant: ArcelorMittal

Inventor： Dongwei Fan ,  Hyun Jo Jun ,  John A. Rotole

IPC: C21D9/46 ,  C21D8/02 ,  C23C2/02 ,  C23C2/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/22 ,  C23C2/40 ,  B32B15/01 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C23C2/12 ,  C22C38/24 ,  C23C2/28

Abstract: A method for producing a cold rolled and hot dip coated steel sheet is provided. The method includes casting a steel into a slab, reheating, hot rolling, cooling, coiling, descaling and cold rolling the slab. The cold rolled steel sheet is annealed so a layer of iron oxide forms on the surface with an internal oxidation underneath. The sheet is then heated so the surface is oxidized and the layer of iron oxide is fully reduced to obtain an internally oxidized depth between 200 nm and 100 μm which includes one or more of Si, Mn, Al, Ti containing oxides. The sheet is then hot dip coated and cooled.

公开(公告)号：US10907232B2

公开(公告)日：2021-02-02

申请号：US15322789

申请日：2015-07-03

Applicant: ArcelorMittal

Inventor： Dongwei Fan ,  Hyun Jo Jun ,  Rashmi Ranjan Mohanty ,  Pavan K. C. Venkatasurya

IPC: C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C21D8/02 ,  C21D1/18 ,  C21D6/00 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A method for producing a high strength coated steel sheet having an improved ductility and an improved formability, the chemical composition of the steel containing: 0.13%≤C≤0.22%, 1.9%≤Si≤2.3%, 2.4%≤Mn≤3%, Al≤0.5%, Ti

公开(公告)号：US20170137908A1

公开(公告)日：2017-05-18

申请号：US15322789

申请日：2015-07-03

Applicant: ArcelorMittal

Inventor： Dongwei Fan ,  Hyun Jo Jun ,  Rashmi Ranjan Mohanty ,  Pavan K.C. Venkatasurya

IPC: C21D9/46 ,  C23C2/28 ,  C23C2/40 ,  C22C38/14 ,  C21D1/18 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D6/00 ,  C23C2/06 ,  C22C38/12

CPC classification number: C21D9/46 ,  C21D1/18 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/285 ,  C23C2/40

Abstract: A method for producing a high strength coated steel sheet having an improved ductility and an improved formability, the chemical composition of the steel containing: 0.13%≦C≦0.22%, 1.9%≦Si≦2.3%, 2.4%≦Mn≦3%, Al≦0.5%, Ti

公开(公告)号：US20170137907A1

公开(公告)日：2017-05-18

申请号：US15322712

申请日：2015-07-03

Applicant: ArcelorMittal

Inventor： Rashmi Ranjan Mohanty ,  Hyun Jo Jun ,  Dongwei Fan ,  Pavan K.C. Venkatasurya

IPC: C21D9/46 ,  C21D1/18 ,  C22C38/02 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C21D6/00 ,  C22C38/14

Abstract: A method for producing a high strength steel sheet having a yield strength YS>850 MPa, a tensile strength TS>1180 MPa, a total elongation >13% and a hole expansion ratio HER>30%, by heat treating a steel sheet wherein the chemical composition of the steel contains: 0.13%≦C≦0.22%, 1.2%≦Si≦1.8%, 1.8%≦Mn≦2.2%, 0.10%≦Mo≦0.20%, Nb≦0.05%, Ti 865° C. and 30° C./s in order to have, just after quenching, a structure consisting of austenite and at least 50% of martensite, the austenite content being such that the final structure can contain between 3% and 15% of residual austenite and between 85% and 97% of the sum of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 370° C. and 470° C. and maintained at this temperature for a time Pt between 50 s and 150 s, then cooled to the room temperature

公开(公告)号：US12110570B2

公开(公告)日：2024-10-08

申请号：US18135962

申请日：2023-04-18

Applicant: ArcelorMittal

Inventor： Hyun Jo Jun

IPC: C21D9/46 ,  B32B15/01 ,  C21D1/20 ,  C21D1/25 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/26 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D1/20 ,  C21D1/25 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/26 ,  C22C38/38 ,  C23C2/02 ,  C23C2/022 ,  C23C2/06 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A cold rolled, coated and post batch annealed steel sheet produced by a method is provided. The method includes cold rolling a steel sheet; coating the cold rolled steel sheet with a zinc or zinc alloy coating, the cold rolled, coated steel sheet having an initial hole expansion and an initial yield strength and post batch annealing the cold rolled, coated steel sheet at a tempering temperature in a range from 150 to 650° C., the post batch annealed steel sheet having a final hole expansion and a final yield strength. The steel sheet includes (in wt. %) C—0.1-0.3%, Mn—1-3%, Si—0.5-3.5%, Al—0.05-1.5% and Mo+Cr being between 0-1.0%. The final hole expansion is at least 80% greater than the initial hole expansion and the final yield strength is at least 30% greater than the initial yield strength.

公开(公告)号：US11492676B2

公开(公告)日：2022-11-08

申请号：US16931001

申请日：2020-07-16

Applicant: ARCELORMITTAL

Inventor： Rashmi Ranjan Mohanty ,  Hyun Jo Jun ,  Dongwei Fan

IPC: C21D9/46 ,  B32B15/01 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C21D8/02 ,  C21D1/18 ,  C22C38/02 ,  C22C38/38 ,  C22C38/34 ,  C22C38/06 ,  C22C38/58

Abstract: A method is for producing a high strength coated steel sheet having a yield stress YS>800 MPa, a tensile strength TS>1180 MPa, and improved formability and ductility. The steel contains: 15%≤C≤0.25%, 1.2%≤Si≤1.8%, 2%≤Mn≤2.4%, 0.1%≤Cr≤0.25%, Al≤0.5%, the remainder being Fe and unavoidable impurities. The sheet is annealed at a temperature higher than Ac3 and lower than 1000° C. for a time of more than 30 s, then quenched by cooling it to a quenching temperature QT between 250° C. and 350° C., to obtain a structure consisting of at least 60% of martensite and a sufficient austenite content such that the final structure contains 3% to 15% of residual austenite and 85% to 97% of martensite and bainite without ferrite, then heated to a partitioning temperature PT between 430° C. and 480° C. and maintained at this temperature for a partitioning time Pt between 10 s and 90 s, then hot dip coated and cooled to the room temperature.

公开(公告)号：US09976203B2

公开(公告)日：2018-05-22

申请号：US13747451

申请日：2013-01-22

Applicant: ArcelorMittal

Inventor： Hyun Jo Jun ,  Narayan Subramaniam Pottore ,  Nina Michailovna Fonstein ,  Oleg N. Yakubovsky

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/08 ,  C22C38/00

CPC classification number: C22C38/14 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12

Abstract: A cold rolled, annealed TRIP steel sheet which has a composition including (in wt. %): C: 0.1-0.3; Mn: 4-10, Al: 0.05-5, Si: 0.05-5; and Nb: 0.008-0.1, the remainder being iron and inevitable residuals. The cold rolled sheet has an ultimate tensile strength of at least 1000 MPa, and a total elongation of at least 15%. The cold rolled sheet may have at least 20% retained austenite in its microstructure and may have greater than 50% lath-type annealed ferrite structure. The cold rolled sheet may have an ultra fine grain size of less than 5 micron for the retained austenite and ferrite.