公开(公告)号：US20170327923A1

公开(公告)日：2017-11-16

申请号：US15536356

申请日：2015-12-22

申请人： POSCO

发明人： Jong Jin JEON ,  Dong Ik SHIN

IPC分类号： C21D9/46 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/26 ,  C22C38/44

CPC分类号： C21D9/46 ,  C21D1/26 ,  C21D6/004 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0426 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/44

摘要： Provided is super duplex stainless steel having excellent yield strength and impact toughness, wherein a reduction ratio and a heat treatment temperature are controlled so as to improve mechanical properties. The super duplex stainless steel having excellent yield strength and impact toughness is thick super duplex stainless steel having a thickness of 30 mm or greater, and includes, in weight %, Cr: 24% to 26%, Ni: 6.0% to 8.0%, Mo: 3.5% to 5.0%, N: 0.24% to 0.32%, and the remainder being Fe and inevitable impurities, wherein a microstructure includes a ferrite phase, an austenite phase and a secondary austenite phase, and grain size is 25 μm or less.

公开(公告)号：US20170327919A1

公开(公告)日：2017-11-16

申请号：US15520531

申请日：2015-10-29

申请人： JFE STEEL CORPORATION

发明人： Yoshiyasu KAWASAKI ,  Hiroshi MATSUDA ,  Takeshi YOKOTA ,  Takako YAMASHITA ,  Kazuhiro SETO

IPC分类号： C21D9/46 ,  B32B15/01 ,  C23C2/40 ,  C23C2/12 ,  C23C2/06 ,  C22C38/38 ,  C22C38/28 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23G1/00 ,  C21D6/00 ,  C21D8/02 ,  C25D3/22

CPC分类号： C21D9/46 ,  B32B15/012 ,  B32B15/013 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/38 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23G1/00 ,  C25D3/22

摘要： A high-strength steel sheet with excellent formability and high yield ratio that has TS of 980 MPa or more and YR of 68% or more is obtained by providing a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15 to 55% of polygonal ferrite, 8% or more of non-recrystallized ferrite, and 15 to 30% of martensite, and that contains, in volume fraction, 12% or more of retained austenite, in which the polygonal ferrite has a mean grain size of 4 μm or less, the martensite has a mean grain size of 2 μm or less, the retained austenite has a mean grain size of 2 μm or less, and a value obtained by dividing an Mn content in the retained austenite (in mass %) by an Mn content in the polygonal ferrite (in mass %) equals 2.0 or more.

公开(公告)号：US20170314106A1

公开(公告)日：2017-11-02

申请号：US15643876

申请日：2017-07-07

申请人： KABUSHIKI KAISHA TOSHIBA

发明人： Shun OINUMA ,  Kiyoshi IMAI ,  Shigekazu MIYASHITA ,  Kuniyoshi NEMOTO

IPC分类号： C22C38/32 ,  C22C38/06 ,  F01D25/00 ,  C22C38/24 ,  F01D5/28 ,  C22C38/00 ,  C22C38/28 ,  C22C38/26 ,  C22C38/30 ,  F01D9/04

CPC分类号： C22C38/32 ,  C21D2211/001 ,  C22C19/058 ,  C22C30/00 ,  C22C38/00 ,  C22C38/004 ,  C22C38/06 ,  C22C38/105 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/40 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  F01D5/28 ,  F01D9/02 ,  F01D9/041 ,  F01D25/00 ,  F01D25/005 ,  F02C7/00 ,  F05D2220/30 ,  F05D2300/171

摘要： The austenitic heat resistant steel of the embodiment contains: 24 to 50% by mass of Ni, 5 to 13% by mass of Cr, 0.1 to 12% by mass of Co, 0.1 to 5% by mass of Nb, 0.1 to 0.5% by mass of V, 1.90 to 2.35% by mass of Ti, 0.01 to 0.30% by mass of Al, 0.001 to 0.01% by mass of B, 0.001 to 0.1% by mass of C, and the balance being Fe and inevitable impurities.

公开(公告)号：US09738958B2

公开(公告)日：2017-08-22

申请号：US13993452

申请日：2011-12-12

申请人： Kwang-Geun Chin ,  Sang-Ho Han ,  Jai-Hyun Kwak

发明人： Kwang-Geun Chin ,  Sang-Ho Han ,  Jai-Hyun Kwak

IPC分类号： C22C38/04 ,  C22C38/58 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C23C30/00 ,  C23C2/02 ,  C23C2/28 ,  B21D17/04 ,  B32B15/01 ,  C22C38/12 ,  C22C38/20 ,  C22C38/28 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC分类号： C22C38/58 ,  B21D17/04 ,  B32B15/01 ,  B32B15/012 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0247 ,  C21D8/0273 ,  C21D8/0284 ,  C21D2211/001 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/28 ,  C22C38/38 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/28 ,  C23C30/00 ,  Y10T428/12757 ,  Y10T428/12799

摘要： Provided is an austenitic, lightweight, high-strength steel sheet having a high yield ratio and ductility and a method for producing the same, and more particularly, to a high-strength steel sheet for automotive interior panels, exterior panels, and structural parts, and a method for producing the steel sheet. The steel sheet may be a hot-rolled steel sheet, a cold-rolled steel sheet, or a plated steel sheet. The steel sheet includes, by weight %, C: 0.6% to 1.0%, Si: 0.1% to 2.5%, Mn: 10% to 15%, P: 0.02% or less, S: 0.015% or less, Al: 5% to 8%, Ti: 0.01% to 0.20%, N: 0.02% or less, and the balance of Fe and inevitable impurities, wherein the steel sheet has a specific gravity of 7.4 g/cm3 and a Mn/Al ratio of 2 to 3.

公开(公告)号：US20170233847A1

公开(公告)日：2017-08-17

申请号：US15502264

申请日：2015-08-07

申请人： ArcelorMittal

发明人： Jean-Philippe Masse ,  Jean-Christophe Hell

IPC分类号： 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分类号： 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

摘要： 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：US20170218473A1

公开(公告)日：2017-08-03

申请号：US15328469

申请日：2015-07-21

申请人： voestalpine Stahl GmbH

发明人： Michael Haslmayr ,  Siegfried Kolnberger ,  Thomas Kurz ,  Leopold Stegfellner ,  Andreas Sommer

IPC分类号： C21D9/46 ,  C21D1/673 ,  C21D1/52 ,  C21D1/42 ,  F27B9/36 ,  F27B9/06

CPC分类号： C21D9/46 ,  C21D1/34 ,  C21D1/40 ,  C21D1/42 ,  C21D1/52 ,  C21D1/673 ,  C21D2211/001 ,  C21D2221/00 ,  F27B9/062 ,  F27B9/068 ,  F27B9/36 ,  F27B2009/124 ,  Y02P10/253

摘要： A method for heating a blank or a preformed steel sheet component for hot forming and/or quench hardening purposes. In at least some regions, the heating is carried out to a temperature above AC3; the heating of the Hank is embodied as a rapid heating and to this end, the blank is heated in a first zone at an average heating rate of >25 K/s up to about 600° C. and above this temperature, is heated at an average heating rate of >10 K/s up to a maximum of the AC3 temperature and then is transferred to a second zone in which the blank that has been preheated in the first zone is heated in at least some regions to temperatures greater than AC3, in particular >850° C., with the heating rate in the second zone being >10 K/s. The invention also relates to a device for carrying out the method.

公开(公告)号：US09714459B2

公开(公告)日：2017-07-25

申请号：US14387114

申请日：2013-03-28

申请人： NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION

发明人： Yoshiharu Inoue ,  Fumio Fudanoki ,  Junichi Hamada

IPC分类号： C22C38/58 ,  C21D9/46 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C21D1/26 ,  C21D8/02

CPC分类号： C22C38/58 ,  C21D1/26 ,  C21D6/004 ,  C21D8/0236 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

摘要： The present invention is directed to a heat-resistant austenitic stainless steel sheet comprising, by mass %, C: 0.03% to 0.06%, N: 0.1% to 0.3%, Si: 1% or less Mn: 3% or less, P: 0.04% or less, S: 0.03% or less, Ni: 5 to 12%, Cr: 15 to 20%, Al: 0.01% to 0.1%, Nb: 0.05% to 0.3%, V: 0.05% to 0.30%, Ti: 0.03% or less, (Nb+V)/(C+N): 2 or less and further a balance of Fe and unavoidable impurities, and wherein an amount of precipitates mainly comprised of carbonitrides is 1% or less.

公开(公告)号：US20170204493A1

公开(公告)日：2017-07-20

申请号：US15407922

申请日：2017-01-17

申请人： AK Steel Properties, Inc.

发明人： Amrinder Singh Gill

IPC分类号： C21D9/46 ,  C21D8/02

CPC分类号： C21D9/46 ,  C21D8/0231 ,  C21D2211/001 ,  C21D2211/008

摘要： Warming a metastable steel before or during cold rolling suppresses the transformation of austenite to martensite, resulting in lower mill loads and higher amounts of reduction at similar loads. As-warm rolled steel has enhanced mechanical properties when compared to steel reduced the same amount by cold rolling. Warm rolling followed by subsequent annealing also results in better mechanical properties than those achieved in material cold rolled the same amount and then annealed. Metastable steel that has been warm rolled, on subsequent room temperature rolling (cold rolling), also shows enhancement in both strength and ductility

公开(公告)号：US09708679B2

公开(公告)日：2017-07-18

申请号：US14348502

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C23C2/02 ,  C21D8/02 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  B32B15/01 ,  C22C38/02 ,  C22C38/04

CPC分类号： C21D8/0263 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： There is provided a high-strength hot-dip galvanized steel sheet and the like excellent in mechanical cutting property, which are capable of obtaining high ductility while ensuring high strength with maximum tensile strength of 900 MPa or more. The high-strength hot-dip galvanized steel sheet has a sheet thickness of 0.6 to 5.0 mm and has a plating layer on a surface of a steel sheet with component compositions being set in appropriate ranges, in which the steel sheet structure contains a 40 to 90% ferrite phase and a 3% or more retained austenite phase by volume fraction. In the retained austenite phase, a solid solution carbon amount is 0.70 to 1.00%, an average grain diameter is 2.0 μm or less, an average distance between grains is 0.1 to 5.0 μm, a thickness of a decarburized layer in a steel sheet surface layer portion is 0.01 to 10.0 μm, an average grain diameter of oxides contained in the steel, sheet surface layer portion is 30 to 120 nm and an average density thereof is 1.0×1012 oxides/m2 or more, and moreover, a work hardening coefficient (n value) during a 3 to 7% plastic deformation is 0.080 or more on average.

公开(公告)号：US20170191141A1

公开(公告)日：2017-07-06

申请号：US15462241

申请日：2017-03-17

申请人： JFE Steel Corporation

发明人： Hiroshi Matsuda ,  Tatsuya Nakagaito ,  Takayuki Futatsuka ,  Shusaku Takagi ,  Yasunobu Nagataki

IPC分类号： C21D9/46 ,  C23F17/00 ,  C22C38/40 ,  C22C38/32 ,  C22C38/28 ,  C22C38/02 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C23C2/06 ,  C22C38/26

CPC分类号： C21D9/46 ,  B32B15/013 ,  C21D2211/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/40 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23F17/00

摘要： A high-strength hot-dip galvanized steel sheet excellent in formability includes, on the basis of mass percent, 0.05-0.3% C, 1.4% or less (including 0%) Si, 0.08%-3% Mn, 0.003-0.1% P, 0.07% or less S, 0.1-2.5% Al, 0.1-0.5% Cr, and 0.007% or less N, Si+Al≧0.5%, and the balance being Fe and incidental impurities, wherein the steel sheet has a retained austenite content of 3% or more by volume fraction, a stretch-flange formability λ>50% and wherein the average aspect ratio (major axis/minor axis) of retained austenite grains is less than 2.5.