公开(公告)号：US12037655B2

公开(公告)日：2024-07-16

申请号：US17415730

申请日：2019-09-18

申请人： JFE STEEL CORPORATION

发明人： Masatoshi Aratani ,  Ryoji Matsui ,  Tomonori Kondou

IPC分类号： C21D9/08 ,  C21D8/10 ,  C21D9/00 ,  C21D9/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42 ,  C22C38/58

CPC分类号： C21D9/085 ,  C21D8/10 ,  C21D9/0012 ,  C21D9/505 ,  C22C38/005 ,  C22C38/02 ,  C22C38/42 ,  C22C38/58 ,  C21D2211/001 ,  C21D2211/005

摘要： Provided is an electric resistance welded steel pipe or tube that develops no quench cracks despite having carbon content of 0.40% or more and has excellent fatigue strength. An electric resistance welded steel pipe or tube comprises: a chemical composition containing, in mass %, C: 0.40% to 0.55%, Si: 0.10% to 1.0%, Mn: 0.10% to 2.0%, P: 0.10% or less, S: 0.010% or less, Al: 0.010% to 0.100%, Cr: 0.05% to 0.30%, Ti: 0.010% to 0.050%, B: 0.0005% to 0.0030%, Ca: 0.0001% to 0.0050%, and N: 0.0005% to 0.0050%, with a balance consisting of Fe and inevitable impurities; and a ferrite decarburized layer at each of an outer surface and an inner surface, the ferrite decarburized layer having a depth of 20 μm to 50 μm from the surface.

公开(公告)号：US20240229979A9

公开(公告)日：2024-07-11

申请号：US18547172

申请日：2022-02-25

申请人： BAOSHAN IRON & STEEL CO., LTD.

发明人： Wen SUN ,  Yaoheng LIU ,  Zhonghua ZHANG ,  Ping HU ,  Yannan MA

IPC分类号： F16L9/02 ,  C21D1/84 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

CPC分类号： F16L9/02 ,  C21D1/84 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/085 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D2211/002

摘要： The present disclosure provides a bainite geological drilling pipe, comprising the following chemical elements in percentage by mass: 0.14-0.22% of C, 0.2-0.55% of Si, 2.1-2.9% of Mn, 0.01-0.04% of Nb, 0.015-0.04% of Al, 0.001-0.005% of B, 0

公开(公告)号：US20240200161A1

公开(公告)日：2024-06-20

申请号：US17909826

申请日：2021-01-20

申请人： Shanghai Electric Power Generation Equipment Co., Ltd.

发明人： Linbo MEI ,  Lingen SUN ,  Chunxiang AN ,  Yu WANG

IPC分类号： C21D9/08 ,  C21D1/18 ,  C21D1/28 ,  C21D6/00 ,  C21D8/10 ,  C22C33/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60

CPC分类号： C21D9/085 ,  C21D1/18 ,  C21D1/28 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/105 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/60

摘要： The present invention provides an element composition and use of a heat-resistant steel for steel pipes and castings. The present invention further provides a preparation method and use of a steel pipe and a casting. The heat-resistant steel for steel pipes and castings provided by the present invention according to preferred element composition can be used to prepare the heat-resistant steel pipe and the casting with excellent properties through the preparation steps thereof. The steel pipe and the casting prepared from this heat-resistant steel have excellent creep rupture strength, and can satisfy the use requirements of pressure vessels or parts of power machinery with a working temperature of 650° C. and below 650° C.

公开(公告)号：US11952648B2

公开(公告)日：2024-04-09

申请号：US16685333

申请日：2019-11-15

申请人： TENARIS COILED TUBES, LLC

发明人： Martin Valdez ,  Bruce A. Reichert ,  Jorge Mitre

IPC分类号： C21D9/10 ,  C21D6/00 ,  C21D8/10 ,  C21D9/08 ,  C21D9/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  E21B17/20

CPC分类号： C22C38/38 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/105 ,  C21D9/08 ,  C21D9/085 ,  C21D9/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  E21B17/20

摘要： Described herein are coiled tubes with improved and varying properties along the length that are produced by using a continuous and dynamic heat treatment process (CDHT). Coiled tubes can be uncoiled from a spool, subjected to a CDHT process, and coiled onto a spool. A CDHT process can produce a “composite” tube such that properties of the tube along the length of the tube are selectively varied. For example, the properties of the tube can be selectively tailored along the length of the tube for particular application for which the tube will be used.

公开(公告)号：US11898216B2

公开(公告)日：2024-02-13

申请号：US16981435

申请日：2019-03-26

申请人： NIPPON STEEL CORPORATION

发明人： Hiroki Kamitani ,  Takanori Tanaka ,  Atsushi Soma ,  Keiichi Kondo ,  Hideki Mitsunari ,  Seiya Okada ,  Takuya Matsumoto ,  Shinji Yoshida ,  Yuji Arai

IPC分类号： C21D9/08 ,  B21D41/04 ,  C21D8/10

CPC分类号： C21D9/085 ,  B21D41/04 ,  C21D8/105

摘要： A seamless steel pipe heat-treatment-finishing-treatment continuous facility includes: a heat treatment apparatus; a steel pipe inspection apparatus which performs a test for a surface defect and/or an inner defect of the seamless steel pipe, the steel pipe inspection apparatus being disposed downstream of the heat treatment apparatus; a main transfer mechanism which forms a main transfer path MT for transferring the seamless steel pipe, discharged from the heat treatment apparatus, to the steel pipe inspection apparatus disposed downstream of the heat treatment apparatus; and a first forced steel pipe-temperature reduction apparatus which forcibly reduces a temperature of the seamless steel pipe on the main transfer path MT, the first forced steel pipe-temperature reduction apparatus being disposed on the main transfer path MT at a position downstream of the heat treatment apparatus and upstream of the steel pipe inspection apparatus.

公开(公告)号：US20230366071A1

公开(公告)日：2023-11-16

申请号：US18245564

申请日：2021-10-07

申请人： NIPPON STEEL CORPORATION

发明人： Toshiya NISHIMURA ,  Daisuke MATSUO

IPC分类号： C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/08 ,  C21D8/10 ,  C21D6/00

CPC分类号： C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/005 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D9/085 ,  C21D8/105 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008

摘要： A martensitic stainless steel material contains, in mass %, C: 0.030% or less, Ni: 5.00 to 7.00%, Cr: 10.00 to 14.00%, and Cu: more than 1.00 to 3.50%. On two line segments LS of 1000 μm extending in a wall thickness direction with arbitrary two points as a center located at positions at a depth of 2 mm from the inner surface, respectively, a degree of Cr segregation ΔCr defined by Formula (1) described in the description, a degree of Mo segregation ΔMo defined by Formula (2) described in the description, and a degree of Cu segregation ΔCu defined by Formula (3) described in the description satisfy Formula (4):


ΔCr+ΔMo+ΔCu≤A  (4)



where, when the yield strength is 758 to less than 862 MPa, A in Formula (4) is 0.70, and when the yield strength is 862 MPa or more, A in Formula (4) is 0.50.

公开(公告)号：US11814693B2

公开(公告)日：2023-11-14

申请号：US17550781

申请日：2021-12-14

申请人： Benteler Steel/Tube GmbH

发明人： Jayaram Dadda ,  Leonhard Rose ,  Matthias Ritter ,  Farzad Foadian

IPC分类号： C21D9/08 ,  C22C38/50 ,  C22C38/46 ,  C22C38/44 ,  C22C38/48 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D6/00 ,  C21D1/42 ,  C21D1/18 ,  C21D1/30

CPC分类号： C21D9/085 ,  C21D1/18 ,  C21D1/42 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D1/30 ,  C21D2211/008

摘要： The present invention relates to a high strength steel tube. In addition, the invention relates to a method of manufacturing a high strength steel tube. The method is characterized in that a hot rolled pre-tube is subjected to at least two hardening steps with a final tempering step, the pre-tube is heated to a quenching temperature of at least Ac3 temperature for hardening and is heated to a tempering temperature in the range of 400 to 600° C. for tempering.

公开(公告)号：US11773461B2

公开(公告)日：2023-10-03

申请号：US17059078

申请日：2019-04-25

申请人： JFE STEEL CORPORATION

发明人： Mami Endo ,  Yuichi Kamo ,  Masao Yuga

IPC分类号： C21D9/08 ,  C21D1/18 ,  C21D6/00 ,  C21D8/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54

CPC分类号： C21D9/085 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/105 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C21D2211/008

摘要： A martensitic stainless steel seamless pipe for oil country tubular goods having a yield stress of 758 MPa or more, and excellent sulfide stress corrosion cracking resistance, and a method for manufacturing the same. The martensitic stainless steel seamless pipe has a composition that contains, by mass %, C: 0.010% or more, Si: 0.5% or less, Mn: 0.05 to 0.50%, P: 0.030% or less, S: 0.005% or less, Ni: 4.6 to 8.0%, Cr: 10.0 to 14.0%, Mo: 1.0 to 2.7%, Al: 0.1% or less, V: 0.005 to 0.2%, N: 0.1% or less, Ti: 0.255 to 0.500%, Cu: 0.01 to 1.0%, Co: 0.01 to 1.0%, and the balance being Fe and incidental impurities. C, Mn, Cr, Cu, Ni, Mo, W, Nb, N, and Ti satisfy a predetermined relationship.

公开(公告)号：US11761052B2

公开(公告)日：2023-09-19

申请号：US17801019

申请日：2021-02-24

申请人： Multimatic Inc.

发明人： Mark Sullivan

IPC分类号： B21K21/12 ,  C21D9/08 ,  B23K9/028 ,  B23K9/173 ,  B23K9/235 ,  B23K33/00 ,  C21D1/18 ,  C21D1/56 ,  C21D8/10 ,  C21D9/50

CPC分类号： C21D9/085 ,  B21K21/12 ,  B23K9/0282 ,  B23K9/173 ,  B23K9/235 ,  B23K33/008 ,  C21D1/18 ,  C21D1/56 ,  C21D8/105 ,  C21D9/505 ,  C21D2211/008

摘要： A process for preparing a multi-thickness welded steel vehicle rail, the process comprises the steps of: (a) forming a first tube having a first outer diameter, an inner diameter and a first wall thickness; (b) forming a second tube having the first outer diameter, a second inner diameter and a second wall thickness different than the first wall thickness; (c) swaging a first end of the first tube to a second outer diameter less than the second inner diameter of the second tube; (d) inserting the swaged first end of the first tube into an end of the second tube to form a joint; (e) welding the first tube and the second tube together to form a weld at the joint to form a tube blank with a heat affected zone of lower metal strength in the area of the weld; (f) preheating the tube blank to create a common crystalline microstructure along a length of the tube blank; (g) introducing the tube blank into a blow molding tool having inner molding walls; (h) molding the tube blank at an elevated temperature by expanding the tube blank against the inner molding walls of the molding tool by injecting a pressurized medium into an interior cavity of the tube blank; and (i) quenching the tube blank by replacing the pressurized medium with a cooling medium through the molding tool and the tube blank to achieve a rapid cooling effect on the tube blank and to create a completed vehicle rail with essentially uniform material strength across the weld. A completed vehicle rail has an overlapped welded structure and uniform microcrystalline structure along the length of the rail.

公开(公告)号：US11761051B2

公开(公告)日：2023-09-19

申请号：US16968724

申请日：2019-02-22

申请人： VALLOUREC DEUTSCHLAND GmbH

发明人： Mahrez Khouja ,  Bernhard Koschlig ,  Ralf Hojda

IPC分类号： C22C38/00 ,  C21D9/08 ,  C21D8/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/50

CPC分类号： C21D9/085 ,  C21D8/105 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/50 ,  C21D2211/008

摘要： The present invention deals with alloyed steels having yield strength of at least 862 MPa (125 Ksi) and exhibiting outstanding hardness and toughness behavior, especially under stringent conditions which may be subjected to frost-heave and thaw settlement cycles, namely at subzero temperatures. The invention also relates to a seamless pipe comprising said steel and a method of production of said pipe thereof.