公开(公告)号：US20180171459A1

公开(公告)日：2018-06-21

申请号：US15735337

申请日：2016-06-09

Applicant: ArcelorMittal

Inventor： Josee Drillet ,  Veronique Hebert

IPC: C23C2/02 ,  C23C14/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  B32B15/01

CPC classification number: C23C2/02 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0273 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0473 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C14/02

Abstract: The present invention provides a cold-rolled and annealed steel sheet of thickness between 0.7 mm and 2 mm, mechanical strength ranging from 1180 MPa to 1320 MPa, wherein the hole expansion ratio Ac % is greater than 20% and the bending angle is greater than or equal to 40°. The chemical composition includes, the contents being expressed as weight percent: 0.09%≤C≤0.11%, 2.6%≤Mn≤2.8%, 0.20%≤Si≤0.55%, 0.25%≤Cr

公开(公告)号：US10000832B2

公开(公告)日：2018-06-19

申请号：US14342039

申请日：2012-08-28

Applicant: Hideki Takabe ,  Hisashi Amaya ,  Kazuhiro Ogawa

Inventor： Hideki Takabe ,  Hisashi Amaya ,  Kazuhiro Ogawa

IPC: C22C38/58 ,  C21D9/08 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54 ,  C21D6/00 ,  C21D9/50

CPC classification number: C22C38/58 ,  C21D6/004 ,  C21D6/005 ,  C21D9/08 ,  C21D9/50 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/54

Abstract: Provided is duplex stainless steel having high strength, SCC resistance and SSC resistance excellent in a high-temperature chloride environment, and capable of suppressing precipitation of a σ phase. The duplex stainless steel of the present embodiment includes, in mass %, of: C: at most 0.03%; Si: 0.2 to 1%; Mn: more than 5.0% to at most 10%; P: at most 0.040%; S: at most 0.010%; Ni: 4.5 to 8%; sol. Al: at most 0.040%; N: more than 0.2% to at most 0.4%; Cr: 24 to 29%; Mo: 0.5 to less than 1.5%; Cu: 1.5 to 3.5%; W: 0.05 to 0.2%; the balance being Fe and impurities, wherein the duplex stainless steel satisfies Formula (1): Cr+8Ni+Cu+Mo+W/2≥65 . . . (1), where a symbol of each element in Formula (1) represents a content of the element (in mass %).

公开(公告)号：US10000824B2

公开(公告)日：2018-06-19

申请号：US15112901

申请日：2015-01-20

Applicant: JFE STEEL CORPORATION

Inventor： Masataka Yoshino ,  Hiroki Ota ,  Ayako Ta ,  Yukihiro Matsubara ,  Akito Mizutani ,  Mitsuyuki Fujisawa

IPC: C21D9/46 ,  C22C38/52 ,  C22C38/00 ,  C22C38/18 ,  C22C38/54 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/24

CPC classification number: C21D9/46 ,  C21D6/002 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/40 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

Abstract: A material for stainless steel cold rolling suitable for producing a cold-rolled stainless steel sheet that has sufficient corrosion resistance and ridging resistance as well as excellent formability and surface properties is provided. The material for stainless steel cold rolling according to the present invention contains, in terms of % by mass, C: 0.007% to 0.05%, Si: 0.02% to 0.50%, Mn: 0.05% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06%, and the balance being Fe and unavoidable impurities, wherein the material has a microstructure that includes 10% to 60% of a martensite phase in terms of area fraction, with the remainder being a ferrite phase, and the martensite phase has a hardness of HV500 or less.

公开(公告)号：US09988700B2

公开(公告)日：2018-06-05

申请号：US14234938

申请日：2012-07-27

Applicant: Akinobu Minami ,  Hiroyuki Kawata ,  Akinobu Murasato ,  Yuji Yamaguchi ,  Natsuko Sugiura ,  Takuya Kuwayama ,  Naoki Maruyama ,  Takamasa Suzuki

Inventor： Akinobu Minami ,  Hiroyuki Kawata ,  Akinobu Murasato ,  Yuji Yamaguchi ,  Natsuko Sugiura ,  Takuya Kuwayama ,  Naoki Maruyama ,  Takamasa Suzuki

IPC: C23C2/02 ,  C22C38/38 ,  C22C38/34 ,  C22C38/26 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/14 ,  C21D8/02 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C21D1/19 ,  C25D5/36 ,  C25D7/06 ,  C25D3/22

CPC classification number: C23C2/02 ,  C21D1/19 ,  C21D8/0205 ,  C21D8/0247 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/34 ,  C22C38/38 ,  C23C2/06 ,  C23C2/28 ,  C25D3/22 ,  C25D5/36 ,  C25D7/0614 ,  Y10T428/12799

Abstract: The present invention provides a high-strength steel sheet excellent in shape fixability. The high-strength steel sheet contains C, Si, Mn, P, S, Al, N, and O with predetermined contents, in which a retained austenite phase of 5 to 20% in volume fraction is contained, an amount of solid-solution C contained in the retained austenite phase is 0.80 to 1.00% in mass %, WSiγ is 1.10 times or more WSi*, WMnγ is 1.10 times or more WMn*, and when a frequency distribution is measured with respect to a sum of a ratio between WSi and WSi* and a ratio between WAl and WAl*, a mode value of the frequency distribution is 1.95 to 2.05, and a kurtosis is 2.00 or more.

公开(公告)号：US09970074B2

公开(公告)日：2018-05-15

申请号：US14891889

申请日：2014-07-01

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Kaoru Kawasaki ,  Masaharu Kameda ,  Kohichi Sano ,  Riki Okamoto

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C21D8/04 ,  C21D9/46 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/54 ,  C22C38/12 ,  C21D8/02 ,  B32B15/01 ,  C21D6/00 ,  C22C38/00 ,  C22C38/08 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0473 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A cold-rolled steel sheet includes a predetermined chemical composition, and includes a structure expressed by: an area fraction of ferrite: 95% or more; an area fraction of retained austenite and an area fraction of martensite: 1% to 3% in total; a product of the area fraction of retained austenite and a carbon concentration in retained austenite: 1 or more; a value of I(111)/{I(100)+I(110)} at a region where a depth from a surface is ¼ of a thickness of the cold-rolled steel sheet when intensity of a (hkl) plane is expressed by I(hkl): 2 or less.

公开(公告)号：US20180127855A1

公开(公告)日：2018-05-10

申请号：US15803295

申请日：2017-11-03

Applicant: NUCOR CORPORATION

Inventor： Weiping SUN

IPC: C22C38/04 ,  C22C38/16 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C23C2/40 ,  C23C2/06

CPC classification number: C22C38/04 ,  C21D8/0236 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

Abstract: A cold-rolled ultra-high strength, multi-phase structured steel is disclosed with improved stamping and forming performance during manufacturing processes, while possessing one or more of the following properties: excellent castability and rollability, excellent galvanizability and/or coatability, excellent formability, excellent fracture resistance, excellent stretch formability and stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance and structural performance, excellent intrusion and crash resistance, and excellent weldability, without the purposeful addition of boron.

公开(公告)号：US20180105908A1

公开(公告)日：2018-04-19

申请号：US15567418

申请日：2016-04-22

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Koutarou HAYASHI ,  Akihiro UENISHI ,  Masaharu KAMEDA ,  Jun HAGA ,  Kunio HAYASHI ,  Kohichi SANO ,  Hiroyuki KAWATA

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

CPC classification number: C22C38/58 ,  C21D8/0257 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A base material (13) included in a plated steel sheet (1) includes a structure, at a ¼ sheet thickness position, represented by, in volume fraction: tempered martensite: 3.0% or more; ferrite: 4.0% or more; and retained austenite: 5.0% or more. An average hardness of the tempered martensite in the base material (13) is 5 GPa to 10 GPa, and a part or all of the tempered martensite and the retained austenite in the base material form an M-A. A volume fraction of ferrite in a decarburized ferrite layer (12) included in the plated steel sheet (1) is 120% or more of the volume fraction of the ferrite in the base material (13) at the ¼ sheet thickness position, an average grain diameter of the ferrite in the decarburized ferrite layer (12) is 20 μm or less, a thickness of the decarburized ferrite layer (12) is 5 μm to 200 μm, a volume fraction of tempered martensite in the decarburized ferrite layer (12) is 1.0 volume % or more, a number density of the tempered martensite in the decarburized ferrite layer (12) is 0.01/μm2 or more, and an average hardness of the tempered martensite in the decarburized ferrite layer (12) is 8 GPa or less.

公开(公告)号：US09932659B2

公开(公告)日：2018-04-03

申请号：US15021518

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Minoru Tanaka ,  Yoshitsugu Suzuki ,  Yasunobu Nagataki

IPC: C22C38/34 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C23C2/40 ,  C21D1/74 ,  C21D1/76 ,  C21D8/02 ,  C21D9/56 ,  C21D1/52 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C23C2/36 ,  B32B15/01 ,  C22C18/00 ,  C22C38/16 ,  C22C38/38 ,  C22C38/54 ,  C22C38/58

CPC classification number: C22C38/34 ,  B32B15/013 ,  C21D1/52 ,  C21D1/74 ,  C21D1/76 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D9/56 ,  C21D9/561 ,  C21D2211/004 ,  C21D2211/005 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/36 ,  C23C2/40

Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition containing, on a mass basis: C: 0.08% or more and less than 0.20%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 5 μm or less, the decarburized layer having a thickness of 20 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.

公开(公告)号：US20180066331A1

公开(公告)日：2018-03-08

申请号：US15565217

申请日：2016-04-08

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： Jari PONSILUOMA ,  Maria HINDRUM ,  Josefin EIDHAGEN ,  Katarina PERSSON ,  Russell P. JONES ,  Asa LARSSON

IPC: C21D8/10 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D8/105 ,  B21C1/22 ,  C21D6/004 ,  C21D8/10 ,  C21D2211/001 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58

Abstract: The present disclosure relates to a method of producing a tube of a duplex stainless steel, in particular a duplex stainless steel suitable for use in fuel injection systems for injection of fuel into the combustion chamber of a combustion engine.

公开(公告)号：US20180057916A1

公开(公告)日：2018-03-01

申请号：US15551301

申请日：2016-01-25

Applicant: JFE Steel Corporation

Inventor： Yoshie OBATA ,  Yoshiyasu KAWASAKI ,  Keiji UEDA ,  Shinjiro KANEKO ,  Takeshi YOKOTA ,  Kazuhiro SETO

IPC: C22C38/14 ,  C21D8/02 ,  C21D9/46 ,  C23C2/06 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/12

CPC classification number: C22C38/14 ,  C21D8/0236 ,  C21D8/0268 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40

Abstract: A steel having a composition containing C: more than 0.20% and 0.45% or less, Si: 0.50% to 2.50%, Mn: 2.00% or more and less than 3.50%, and one or two selected from Ti: 0.005% to 0.100% and Nb: 0.005% to 0.100% is hot-rolled and cold-rolled. The steel sheet is heated to 800° C. to 950° C. and cooled to a cooling-end temperature of 350° C. to 500° C. at a cooling rate of 5° C./s or more to form a steel sheet having a microstructure including martensite and bainite phases such that the total proportion of the martensite and bainite phases is 80% or more by volume. The steel sheet is heated to 700° C. to 840° C. and maintained at 700° C. to 840° C., cooled to a cooling-end temperature of 350° C. to 500° C. at a cooling rate of 5 to 50° C./s, and maintained within the above temperature range for 10 to 1800 s.