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公开(公告)号：US10787720B2
公开(公告)日：2020-09-29
申请号：US15763859
申请日：2016-08-26
IPC分类号： C22C38/00 , C21D8/10 , C22C38/58 , C21D9/08 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/42 , C22C38/50 , C22C38/38 , C21D9/50 , C22C38/54 , B21C37/08
摘要： An electric resistance welded steel pipe manufactured by performing electric resistance welding on the steel pipe. The steel pipe having a chemical composition including by mass %, C: 0.20% to 0.40%, Si: 0.1% to 1.0%, Mn: 0.1% to 2.0%, Al: 0.01% to 0.10%, Cr: 0.01% to 0.5%, Ti: 0.01% to 0.05%, B: 0.0005% to 0.005%, Ca: 0.0001% to 0.0050%, N: 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel pipe having a microstructure in which each of amounts of TiS particles, having a particle size of 10 μm or more, and MnS particles, having a particle size of 10 μm or more, are decreased to 0.1% or less in terms of cleanliness. The steel pipe having excellent fatigue resistance, exhibiting a high strength, and having an average grain size of prior austenite grains of 50 μm or less when subjected to cold forming followed by quenching and tempering treatments.
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公开(公告)号：US11045896B2
公开(公告)日：2021-06-29
申请号：US16403731
申请日：2019-05-06
发明人： Shinsaku Kokubo , Kenichi Iwazaki , Hiromichi Hori
IPC分类号： B23K11/36 , B21C37/08 , B21C37/30 , F16L9/16 , B21C1/24 , B23K11/087 , B23K31/10 , F16L9/17 , C23C22/12 , C21D9/08
摘要： A method for manufacturing an electric resistance welded steel pipe having an identifiable seam portion. The method includes electric resistance welding a steel pipe, cutting an inner surface bead and an outer surface bead of the steel pipe in such a manner so as to cut: (i) a whole the outer surface bead and a part of the inner surface bead to leave an uncut portion in the inner surface bead, or (ii) a whole of the inner surface bead and a part of the outer surface bead to leave an uncut portion in the outer surface bead, coating the steel pipe with zinc phosphate, and cold drawing the steel pipe using a plug and a die to make the seam portion of the steel pipe identifiable.
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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：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：US10369655B2
公开(公告)日：2019-08-06
申请号：US15555401
申请日：2016-03-01
发明人： Shinsaku Kokubo , Kenichi Iwazaki , Hiromichi Hori
IPC分类号： F16L9/02 , B23K11/36 , B21C37/08 , B21C37/30 , B23K11/087 , B23K31/10 , F16L9/17 , F16L9/16 , B21C1/24 , C23C22/12 , C21D9/08
摘要： An electric resistance welded steel pipe having an identifiable seam portion and a method for manufacturing the same. The electric resistance welded steel pipe includes a steel pipe portion with a seam portion, which is formed by electric resistance welding, and a coating portion of zinc phosphate. The coating portion covers at least an outer surface side of the steel pipe portion. A part of the coating portion that is immediately above the seam portion forms a color difference portion that has a width W along a pipe circumferential direction of greater than or equal to 0.1 times a wall thickness of the pipe and less than or equal to the wall thickness of the pipe. The color difference portion has a visually identifiable color difference from the other parts of the coating portion.
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