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公开(公告)号：US20230128437A1
公开(公告)日：2023-04-27
申请号：US17913882
申请日：2021-03-25
发明人： Kenichiro Eguchi , Masao Yuga
IPC分类号： C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/46 , C22C38/52 , C21D8/10
摘要： A high-strength stainless steel seamless pipe for oil country tubular goods has a composition that comprises, in mass%, C : 0.002 to 0.05%, Si: 0.05 to 0.50%, Mn: 0.04 to 1.80%, P: 0.030% or less, S: 0.002% or less, Cr: more than 14.0% and 17.0% or less, Ni: 4.0 to 8.0%, Mo: 1.5 to 3.0%, Al: 0.005 to 0.10%, V : 0.005 to 0.20%, Co: 0.01 to 1.0%, N : 0.002 to 0.15%, and O: 0.006% or less, and that satisfies the predetermined formulae, and in which the balance is Fe and incidental impurities, the high-strength stainless steel seamless pipe having a microstructure containing prior austenite having an average grain size of 40 µm or less, the high-strength stainless steel seamless pipe having a yield strength of 758 MPa or more.
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公开(公告)号：US20230097339A1
公开(公告)日：2023-03-30
申请号：US17800294
申请日：2021-01-20
发明人： Shunsuke Sasaki , Masao Yuga , Tatsuro Katsumura , Hideo Kijima
IPC分类号： F16L9/02 , F16L15/06 , B21D3/14 , C22C38/60 , C22C38/58 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/02 , C22C38/00 , C21D9/08 , C21D8/10 , C21D6/00
摘要： A stainless steel pipe of a predetermined composition is provided that has an axial tensile yield strength of 689 MPa or more, an axial compressive yield strength/axial tensile yield strength ratio of 0.85 to 1.15, and a microstructure that is 20 to 80% ferrite phase by volume with the remainder containing an austenite phase, the stainless steel pipe having pipe end portions at least one of which has a fastening portion for an external thread or an internal thread, and having a curvature radius of 0.2 mm or more for a corner R formed by a bottom surface of a thread root and a pressure-side flank surface of the thread, measured in an axial plane section of the fastening portion.
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公开(公告)号：US20230048685A1
公开(公告)日：2023-02-16
申请号：US17910464
申请日：2021-03-11
发明人： Yuichi Kamo , Masao Yuga
IPC分类号： C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/60 , C21D8/10
摘要： Provided herein is a stainless steel seamless pipe having a composition that contains, in mass %, C: 0.06% or less, Si: 1.0% or less, Mn: 0.01% or more and 1.0% or less, P: 0.05% or less, S: 0.005% or less, Cr: 15.2% or more and 18.5% or less, Mo: 1.5% or more and 4.3% or less, Cu: 1.1% or more and 3.5% or less, Ni: 3.0% or more and 6.5% or less, Al: 0.10% or less, N: 0.10% or less, O: 0.010% or less, and Sb: 0.001% or more and 1.000% or less, and in which C, Si, Mn, Cr, Ni, Mo, Cu, and N satisfy the predetermined formula, and the balance is Fe and incidental impurities, the stainless steel seamless pipe having a microstructure containing 30% or more martensitic phase, 65% or less ferrite phase, and 40% or less retained austenite phase by volume.
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公开(公告)号：US11535908B2
公开(公告)日：2022-12-27
申请号：US16955529
申请日：2018-11-15
申请人： POSCO
发明人： Hyun-Taek Na , Seok-Jong Seo
IPC分类号： C21D9/46 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C22C38/38 , C21D9/08
摘要： The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet having excellent durability and a method for manufacturing same, the hot-rolled steel sheet having no cracks formed on a material and a welding heat-affected zone (HAZ) even after pipemaking and molding due to a smaller decrease in the strength of the welding heat-affected zone formed during electric resistance welding in comparison with the strength of the material (base material).
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公开(公告)号：US11519050B2
公开(公告)日：2022-12-06
申请号：US16333934
申请日：2017-08-16
发明人： Peter Palzer , Thomas Evertz , Manuel Otto , Kai Köhler
IPC分类号： C21D9/08 , C22C38/02 , C22C38/06 , C21D8/02 , C22C38/04 , C21D6/00 , C21D8/10 , C22C38/00 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/30 , C22C38/32 , C22C38/38 , F16L9/02
摘要： The invention relates to a method for producing a component from a medium manganese flat steel product having 4 to less than 10 wt. % Mn, 0.0005 to 0.9 wt. % C, 0.02 to 10 wt. % Al, the remainder iron, including unavoidable steel-accompanying elements, and having a TRIP effect at room temperature. In order to produce a component, which is distinguished by very high strengths and an increased residual strain and re-shaping capacity, the flat steel product, according to the invention, is re-shaped by at least one re-shaping step to form a component and, before and/or during and/or after the at least one re-shaping step, the flat steel product is cooled down to a temperature of the flat steel product of less than room temperature to −196° C. The invention further relates to a component produced by this method and to a use for said components.
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公开(公告)号：US11512361B2
公开(公告)日：2022-11-29
申请号：US16958736
申请日：2018-12-26
发明人： Yoshikazu Kawabata , Makio Gunji
IPC分类号： C21D9/08 , B23K11/087 , B23K31/12 , C21D1/28 , C21D6/00 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/20 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/38 , B23K103/04 , B23K101/06
摘要： Provided is an electric resistance welded steel pipe or tube having excellent fatigue durability after rapid and short-time heating quenching treatment. An electric resistance welded steel pipe or tube comprises: a base metal being a steel sheet having a specific chemical composition and an electric resistance weld portion having a bond width of 40×10−6 m or more and 120×10−6 m or less, wherein C0-C1 is 0.05 mass % or less, where C0-C1 is a difference between C1 in mass % which is a minimum C content of the electric resistance weld portion and C0 in mass % which is a C content of the steel sheet, and a depth of a total decarburized layer in each of an inner surface layer and an outer surface layer of the electric resistance welded steel pipe or tube is 50×10−6 m or less.
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公开(公告)号：US20220349036A1
公开(公告)日：2022-11-03
申请号：US17764649
申请日：2020-08-27
发明人： Yuichi KAMO , Masao YUGA
摘要： A stainless steel seamless pipe having high strength and excellent corrosion resistance, and a method for producing the same. The stainless steel seamless pipe has a specified composition and satisfies a predetermined formula. The stainless steel seamless pipe has a microstructure containing at least 30% martensitic phase, at most 60% ferrite phase, and at most 40% retained austenite phase by volume, the stainless steel seamless pipe having a yield strength of 758 MPa or more.
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8.发明申请公开(公告)号：US20220339012A1
公开(公告)日：2022-10-27
申请号：US17859563
申请日：2022-07-07
发明人： Deyuan Zhang , Xianmiao Chen , Wenjiao Lin , Xiangdong Liu
IPC分类号： A61F2/82 , A61L27/04 , A61L31/02 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/14 , C22C38/42 , C22C38/44 , C23C8/02 , C23C8/26
摘要： A lumen stent preform is provided using a plasma nitriding technology, a preparation method thereof, a method for preparing a lumen stent by using the preform, and a lumen stent obtained according to the method. The preform is manufactured by using pure iron or an iron alloy containing no strong nitrogen compound, has a hardness of 160-250HV0.05/10, and has a microstructure that is a deformed structure having a grain size scale greater than or equal to 9 or a deformed structure after cold machining. Alternatively, the preform is an iron alloy containing a strong nitrogen compound, and has a microstructure that is a deformed structure having a grain size scale greater than or equal to 9 or a deformed structure after cold machining. The lumen stem preform meets the requirements of a conventional stent for radial strength and plasticity, so that plasma nitriding is applicable to commercial preparation of a lumen stent.
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公开(公告)号：US11471923B2
公开(公告)日：2022-10-18
申请号：US16761640
申请日：2018-11-28
发明人： Kouji Yamane , Kazuhiro Shimoda , Yuji Arai , Akihiro Sakamoto , Yasuhiko Daimon , Haruka Obe
摘要： The production method of a seamless steel pipe includes a heating step of heating an Nb-containing steel material to 800 to 1030° C., a pipe-making step of producing a hollow shell by performing piercing-rolling or elongation-rolling on the Nb-containing steel material, by using a piercing mill including a plurality of skewed rolls, a plug disposed between the plurality of skewed rolls, and a mandrel bar, and a cooling step immediately after rolling, of carrying out cooling using a cooling liquid on a hollow shell portion that passes between rear ends of the plurality of skewed rolls, in the hollow shell, so as to reduce an outer surface temperature of the hollow shell portion to 700 to 1000° C. within 15.0 seconds after the hollow shell portion passes between the rear ends of the plurality of skewed rolls.
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公开(公告)号：US11414723B2
公开(公告)日：2022-08-16
申请号：US16413531
申请日：2019-05-15
申请人： Welspun Corp Limited
摘要： In one embodiment, a method for manufacturing a pipe bend is disclosed, comprising: heating, with an induction coil, a first annular band of a wall of a first end portion of a moving pipe; directing quenching fluid toward an outer and inner surface of the first annular band; heating a second annular band of a wall of a bend portion of the moving pipe; directing the quenching fluid toward an outer and inner surface of the second annular band; decreasing a speed of the pipe while moving the induction coil from stationary and maintaining a relative speed between the pipe and the induction coil substantially constant; heating a third annular band of a wall of a second end portion of the pipe while moving the induction coil; and directing the quenching fluid toward an outer surface and an inner surface of the third annular band while moving the induction coil.
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