公开(公告)号：US20170233847A1

公开(公告)日：2017-08-17

申请号：US15502264

申请日：2015-08-07

Applicant: ArcelorMittal

Inventor： Jean-Philippe Masse ,  Jean-Christophe Hell

IPC: C21D9/46 ,  C21D1/19 ,  C21D1/18 ,  C23C2/02 ,  C23C2/12 ,  C23C2/40 ,  C23C2/06 ,  C22C38/38 ,  C22C38/34 ,  C22C38/06 ,  C22C38/02 ,  C23F17/00 ,  B32B15/01 ,  C25D3/56 ,  C25D3/22 ,  C21D1/26

CPC classification number: C21D9/46 ,  B32B15/012 ,  B32B15/013 ,  C21D1/185 ,  C21D1/19 ,  C21D1/26 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/34 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C23F17/00 ,  C25D3/22 ,  C25D3/565

Abstract: The invention relates to a method for producing a high strength coated steel sheet having a yield stress YS>550 MPa, a tensile strength TS>980 MPa, and improved formability and ductility. The steel contains: 0.15%≦C≦0.25%, 1.2%≦Si≦1.8%, 2%≦Mn≦2.4%, 0.1%≦Cr≦0.25%, Al≦0.5%, the balance being Fe and unavoidable impurities. The sheet is annealed at a temperature between TA1=Ac3−0.45*(Ms−QT) and TA2=830° C. for at least 30s then quenched by cooling it to a quenching temperature QT between 180° C. and 300° C., then heated to a partitioning temperature PT between 380° C. and 480° C. and maintained at this temperature for a partitioning time Pt between 0 sec and 300 sec, then either hot dip coated and cooled to the room temperature with a cooling rate of at least 25° C./s below 300° C., or directly cooled to the room temperature with a cooling rate of at least 25° C./s and further electro-galvanized, or cooled to the room temperature with a cooling rate of at least 25° C./s without coating. The steel according to the invention contains 5% to 25% of intercritical ferrite, at least 50% of partitioned martensite, at least 10% of residual austenite, less than 10% of fresh martensite, and bainite, the sum of partitioned martensite and bainite being at least 60%. It also relates to the obtained coated or non coated sheet.

公开(公告)号：US11987857B2

公开(公告)日：2024-05-21

申请号：US17297292

申请日：2019-12-02

Applicant: ArcelorMittal

Inventor： Irène De Diego Calderon ,  Jean-Christophe Hell

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0268 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005

Abstract: A cold rolled and annealed steel sheet including by weight: 0.6

公开(公告)号：US20160160309A1

公开(公告)日：2016-06-09

申请号：US14907358

申请日：2014-07-24

Applicant: ARCELORMITTAL SA

Inventor： Sebastien Allain ,  Jean-Christophe Hell

IPC: C21D9/46 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/26 ,  C23C2/06 ,  C23C2/40 ,  B22D7/00 ,  C22C38/58

CPC classification number: C21D9/46 ,  B22D7/00 ,  B32B15/013 ,  C21D1/26 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

Abstract: The invention relates to the manufacture of a cold-rolled steel sheet having a strength of more than 900 MPa, an elastic limit of more than 700 MPa and distributed elongation of more than 12%, the composition of which includes, the contents being expressed as weight percentages: 0.26%≦C≦0.45%, 1.0%≦Mn≦3.0%, 1.0%≦Si≦3.0%, Al≦0.10%, 0%≦Cr≦1.5% %, S≦0.005%, P≦0.020%, Nb≦0.1%, Ti≦0.020%, V≦0.015%, N≦0.01%, the remainder of the composition being iron and inevitable impurities resulting from the production process. The microstructure, given in surface proportions, comprises 13% to 25% residual austenite and 13% to 30% MA islands, the remainder consisting of bainite and possibly ferrite.

Abstract translation: 本发明涉及制造强度超过900MPa，弹性极限超过700MPa，分布伸长率大于12％的冷轧钢板，其组成包括内容物表示为 重量百分比：0.26％＆lt; NlE; C＆nlE; 0.45％，1.0％＆nlE; Mn＆nlE; 3.0％，1.0％＆nlE; Si＆amp; NEE; 3.0％Al和nIE; 0.10％，0％ P <0.01; 0.020％，Nb＆nlE; 0.1％，Ti＆NlE; 0.020％，V＆NlE; 0.015％，N＆lt; l1; 0.01％，组成的剩余部分为铁和生产过程产生的不可避免的杂质。 以表面比例给出的微结构包含13％至25％的残余奥氏体和13％至30％的MA岛，其余部分由贝氏体和可能的铁素体组成。

公开(公告)号：US12188102B2

公开(公告)日：2025-01-07

申请号：US16302988

申请日：2017-05-23

Applicant: ARCELORMITTAL

Inventor： Jean-Christophe Hell ,  Nicolas Charbonnier ,  Thierry Iung ,  Blandine Remy

IPC: C22C30/00 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/58

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 treatments 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：US10995386B2

公开(公告)日：2021-05-04

申请号：US15312974

申请日：2015-05-07

Applicant: ArcelorMittal

Inventor： Artem Arlazarov ,  Jean-Christophe Hell ,  Frédéric Kegel

IPC: C21D9/46 ,  C21D9/48 ,  C21D8/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  C23C2/28 ,  C23C2/40 ,  C22C38/00 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23F17/00

Abstract: A double-annealed steel sheet is provided. The composition of which includes, expressed in percent by weight, 0.20%≤C≤0.40%, 0.8%≤Mn≤1.4%, 1.60%≤Si≤3.00%, 0.015≤Nb≤0.150%, Al≤0.1%, Cr≤1.0%, S≤0.006%, P≤0.030%, Ti≤0.05%, V≤0.05%, B≤0.003%, N≤0.01%. A remainder of the composition includes iron and unavoidable impurities resulting from processing. The microstructure of the steel sheet includes, in area percentages, 10 to 30% residual austenite, 30 to 60% annealed martensite, 5 to 30% bainite, 10 to 30% fresh martensite and less than 10% ferrite A fabrication method and vehicle parts are also provided.

公开(公告)号：US10472692B2

公开(公告)日：2019-11-12

申请号：US15323091

申请日：2015-07-03

Applicant: ArcelorMittal

Inventor： Gunhild Föjer ,  Michel Soler ,  Jean-Christophe Hell

IPC: C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04

Abstract: A method for manufacturing a high-strength sheet having improved formability and ductility accord which the chemical composition of the steel contains, in percent by weight: 0.25%

公开(公告)号：US10308995B2

公开(公告)日：2019-06-04

申请号：US14907358

申请日：2014-07-24

Applicant: ArcelorMittal

Inventor： Sebastien Allain ,  Jean-Christophe Hell

IPC: C22C38/04 ,  C22C38/02 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C22C38/34 ,  C22C38/38 ,  C21D9/46 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  B22D7/00 ,  C21D1/26 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  B32B15/01

Abstract: The invention relates to the manufacture of a cold-rolled steel sheet having a strength of more than 900 MPa, an elastic limit of more than 700 MPa and distributed elongation of more than 12%, the composition of which includes, the contents being expressed as weight percentages: 0.26%≤C≤0.45%, 1.0%≤Mn≤3.0%, 1.0%≤Si≤3.0%, Al≤0.10%, 0%≤Cr≤1.5%, S≤0.005%, P≤0.020%, Nb≤0.1%, Ti≤0.020%, V≤0.015%, N≤0.01%, the remainder of the composition being iron and inevitable impurities resulting from the production process. The microstructure, given in surface proportions, comprises 13% to 25% residual austenite and 13% to 30% MA islands, the remainder consisting of bainite and possibly ferrite.