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公开(公告)号：US12037655B2
公开(公告)日：2024-07-16
申请号：US17415730
申请日：2019-09-18
发明人： Masatoshi Aratani , Ryoji Matsui , Tomonori Kondou
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.
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公开(公告)号：US11332812B2
公开(公告)日：2022-05-17
申请号：US16326420
申请日：2017-10-19
摘要： A method for manufacturing an electric resistance welded steel tube for high-strength thin hollow stabilizers is provided. A steel with a certain chemical composition is heated to a temperature of 1000 to 1300° C., hot rolled under conditions where the rolling finish temperature is 750 to 950° C., cooled, coiled into a coil at 500 to 650° C., and skin pass rolled with a rolling reduction ratio of not less than 0.3%. The resultant hot rolled sheet is electric resistance welded into an electric resistance welded steel tube, which is then reheated to a temperature of 800 to 1100° C. and hot stretch-reducing rolled under conditions where the rolling finish temperature is not more than 850° C. and the cumulative diameter reduction is not more than 75%. Consequently, a thin electric resistance welded steel tube is produced.
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公开(公告)号：US20210268862A1
公开(公告)日：2021-09-02
申请号：US17254394
申请日：2019-04-24
IPC分类号： B60G21/055 , B23K11/08 , B21C37/08 , B21D7/025 , C22C38/54 , C22C38/50 , C22C38/42 , C22C38/26 , C22C38/24 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/50 , C21D9/08 , C21D8/10 , C21D6/00
摘要： An electric resistance welded steel pipe for manufacturing a hollow stabilizer has a Rankford value in a pipe longitudinal direction of from 0.7 to less than 1.0. The electric resistance welded steel pipe is subjected to cold bending and then to a heat treatment including quenching and tempering to manufacture a stabilizer. The cold bending is cold rotary draw bending. When bent with a bend radius of from 1.0 times to 3.0 times an outer diameter of the pipe before cold bending, a flattening ratio is from 0% to 10%, a thickness reduction rate on a bending outside and a thickness increase rate on a bending inside are from 0% to 10%, and additionally, a circumferential length change of a bending center portion is from 0% to 10%. A Vickers hardness of the stabilizer after the heat treatment is adjusted to from 400 HV to less than 580 HV.
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公开(公告)号：US11440125B2
公开(公告)日：2022-09-13
申请号：US16979357
申请日：2019-03-11
IPC分类号： B23K11/093 , B21B17/14 , B21C37/08 , B21D5/10 , B60G21/055 , C21D6/00 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/42 , C22C38/50 , C22C38/54 , C21D9/50
摘要： There are provided an electric resistance welded steel pipe for producing a high strength hollow stabilizer excellent in fatigue resistance and a high strength hollow stabilizer. In an electric resistance welded steel pipe (5) for producing a hollow stabilizer, an internal weld bead cut portion (30) has a three-peak shape and a depth (H) of a trough portion (30a) of the three-peak shape is 0.3 mm or less and an angle (θ) formed by a central portion in the circumferential direction of the trough portion (30a) and the top of right and left peak portions (30b, 30c) located on both the right and left sides of the trough portion (30a) is 160° or more and less than 180°.
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公开(公告)号：US20210277507A1
公开(公告)日：2021-09-09
申请号：US16326420
申请日：2017-10-19
摘要： A method for manufacturing an electric resistance welded steel tube for high-strength thin hollow stabilizers is provided. A steel with a certain chemical composition is heated to a temperature of 1000 to 1300° C., hot rolled under conditions where the rolling finish temperature is 750 to 950° C., cooled, coiled into a coil at 500 to 650° C., and skin pass rolled with a rolling reduction ratio of not less than 0.3%. The resultant hot rolled sheet is electric resistance welded into an electric resistance welded steel tube, which is then reheated to a temperature of 800 to 1100° C. and hot stretch-reducing rolled under conditions where the rolling finish temperature is not more than 850° C. and the cumulative diameter reduction is not more than 75%. Consequently, a thin electric resistance welded steel tube is produced.
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公开(公告)号：US20210001425A1
公开(公告)日：2021-01-07
申请号：US16979357
申请日：2019-03-11
IPC分类号： B23K11/093 , C22C38/54 , C22C38/50 , C22C38/42 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/08 , C21D8/10 , C21D6/00 , B21C37/08 , B21D5/10 , B21B17/14 , B60G21/055
摘要： There are provided an electric resistance welded steel pipe for producing a high strength hollow stabilizer excellent in fatigue resistance and a high strength hollow stabilizer. In an electric resistance welded steel pipe (5) for producing a hollow stabilizer, an internal weld bead cut portion (30) has a three-peak shape and a depth (H) of a trough portion (30a) of the three-peak shape is 0.3 mm or less and an angle (θ) formed by a central portion in the circumferential direction of the trough portion (30a) and the top of right and left peak portions (30b, 30c) located on both the right and left sides of the trough portion (30a) is 160° or more and less than 180°.
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7.发明授权公开(公告)号：US10301703B2
公开(公告)日：2019-05-28
申请号：US15520159
申请日：2015-10-19
IPC分类号： C21D9/08 , C21D9/50 , C22C38/38 , C22C38/58 , C22C38/00 , B23K26/262 , B23K26/282 , B21B23/00 , B21C37/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/46 , C22C38/50 , F16L9/17 , B21C37/30 , B23K26/32 , B23K31/02 , C21D8/10 , B23K26/60 , B60R21/261 , B60R21/26 , B23K101/06 , B23K101/16 , B23K103/04
摘要： Disclosed is a high-strength welded steel pipe for airbag inflators that has high toughness and workability. A base material portion of the steel pipe has a composition containing, in mass %, C: 0.02 to 0.08%, Si: 0.001 to 1.0%, Mn: 0.1 to 2.0%, P: 0.1% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Ti: 0.01 to 0.20%, and V: 0.01 to 0.50%, with the balance being Fe and incidental impurities. The base material portion has a structure that includes a ferrite phase having an average grain size of 10 μm or less at an area fraction of 90% or more and a Ti, V-based carbide having an average grain size of 10 nm or less and dispersed in the ferrite phase. The welded steel pipe has a high tensile strength TS of 780 MPa or more and a strength-elongation balance TS×El of 15,000 MPa % or more. The difference ΔHV in Vickers hardness between the base material portion and the welded portion is 60 points or less. In a softened portion having Vickers hardness different from the Vickers hardness of the base material portion by at least 30 points, a softened width Ws in a circumferential direction is 0.05 mm or less.
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8.发明申请公开(公告)号：US20180023163A1
公开(公告)日：2018-01-25
申请号：US15520159
申请日：2015-10-19
IPC分类号： C21D9/50 , B21C37/08 , B21B23/00 , B23K26/282 , C21D9/08 , C22C38/42 , C22C38/50 , C22C38/46 , C22C38/28 , C22C38/24 , C22C38/26 , C22C38/20 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , F16L9/17
CPC分类号： C21D9/50 , B21B23/00 , B21C37/08 , B21C37/30 , B23K26/262 , B23K26/282 , B23K26/32 , B23K26/60 , B23K31/027 , B23K2101/06 , B23K2101/16 , B23K2103/04 , B60R21/26 , B60R21/261 , B60R2021/2612 , C21D8/105 , C21D9/08 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/46 , C22C38/50 , F16L9/17
摘要： Disclosed is a high-strength welded steel pipe for airbag inflators that has high toughness and workability. A base material portion of the steel pipe has a composition containing, in mass %, C: 0.02 to 0.08%, Si: 0.001 to 1.0%, Mn: 0.1 to 2.0%, P: 0.1% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Ti: 0.01 to 0.20%, and V: 0.01 to 0.50%, with the balance being Fe and incidental impurities. The base material portion has a structure that includes a ferrite phase having an average grain size of 10 μm or less at an area fraction of 90% or more and a Ti, V-based carbide having an average grain size of 10 nm or less and dispersed in the ferrite phase. The welded steel pipe has a high tensile strength TS of 780 MPa or more and a strength-elongation balance TS×El of 15,000 MPa % or more. The difference ΔHV in Vickers hardness between the base material portion and the welded portion is 60 points or less. In a softened portion having Vickers hardness different from the Vickers hardness of the base material portion by at least 30 points, a softened width Ws in a circumferential direction is 0.05 mm or less.
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