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公开(公告)号：US11578375B2
公开(公告)日：2023-02-14
申请号：US15747583
申请日：2016-07-20
IPC分类号： C21D8/02 , C21D9/46 , C22C38/38 , C22C38/00 , C22C38/06 , C22C38/28 , C22C38/32 , C22C38/60 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/02 , C22C38/40 , C22C38/04 , C22C38/34
摘要： A high-strength hot-rolled steel sheet that has excellent punching workability and hole expandability, and a method for manufacturing the same. The hot-rolled steel sheet has a tensile strength of 980 MPa or more. The hot-rolled steel sheet has a chemical composition containing C, Si, Mn, P, S, Al, N, Ti, Cr, and B, and has a microstructure including a bainite phase having an area ratio of 85% or more as a main phase, and a martensite phase or martensite-austenite constituent having an area ratio of 15% or less as a second phase, the balance being a ferrite phase. The second phase has an average grain diameter of 3.0 μm or less, prior-austenite grains have an average aspect ratio of 1.3 or more and 5.0 or less, and recrystallized prior-austenite grains have an area ratio of 15% or less relative to non-recrystallized prior-austenite grains.
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公开(公告)号：US11313008B2
公开(公告)日：2022-04-26
申请号：US16500617
申请日：2018-03-29
发明人： Shunsuke Toyoda , Ichiro Sugimoto , Shuji Kawamura
IPC分类号： C22C38/00 , C22C38/14 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/16 , C22C38/06 , C22C38/54 , C21D9/08 , C21D8/02 , C21D8/10 , C21D9/46 , C21D9/50 , C22C38/60 , C22C38/42 , C22C38/44 , C22C38/08 , C22C38/20 , C22C38/40 , C22C38/46 , C22C38/22 , C22C38/24 , C22C38/28 , B32B15/01 , C22C38/18 , C22C38/48 , C22C38/26 , C22C38/50 , B32B1/08 , F16L9/17 , F16L9/16 , F16L9/02
摘要： A steel member, a hot-rolled steel sheet to be used as a material thereof, and production methods therefor are provided. A steel member contains 0.010% to 0.120% Ti, in which 0.005% or more of Ti is precipitated as a precipitate having a particle size of 20 nm or less in the microstructure. A hot-rolled steel sheet for the steel member contains 0.010% to 0.120% Ti, in which 0.005% or more of Ti is present as dissolved Ti in the microstructure. A method for producing the steel member includes subjecting a hot-rolled steel sheet to forming processing and then performing heat treatment including heating to a temperature of higher than 550° C. and 1,050° C. or lower and then cooling at an average cooling rate of 10° C./s or more in the temperature range of 550° C. to 400° C.
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3.发明申请公开(公告)号：US20150083266A1
公开(公告)日：2015-03-26
申请号：US14394163
申请日：2013-04-11
发明人： Shunsuke Toyoda , Sota Goto , Takatoshi Okabe , Tomohiro Inoue , Motoharu Egi , Atsushi Yonemoto
CPC分类号： F16L9/02 , B21B3/00 , B21B27/06 , B21B27/08 , B21C37/08 , B23K11/0073 , B23K11/0873 , B32B1/08 , C21D1/00 , C21D8/00 , C21D8/02 , C21D8/0226 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/085 , C21D9/50 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/58 , F16L9/17 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972 , Y10T428/12979 , Y10T428/13
摘要： A high-strength thick-walled electric resistance welded steel pipe has excellent low-temperature toughness and excellent HIC resistance and a yield strength of 400 MPa or more.The steel has a chemical composition consisting of C: 0.025% to 0.084%, Si: 0.10% to 0.30%, Mn: 0.70% to 1.80%, controlled amounts of P, S, Al, N, and O, Nb: 0.001% to 0.065%, V: 0.001% to 0.065%, Ti: 0.001% to 0.033%, and Ca: 0.0001% to 0.0035% on a mass percent basis and the remainder being Fe and incidental impurities, and satisfies Pcm of 0.20 or less.
摘要翻译： 高强度厚壁电阻焊钢管具有优异的低温韧性和优异的耐HIC性，屈服强度为400MPa以上。 该钢具有C：0.025〜0.084％，Si：0.10〜0.30％，Mn：0.70〜1.80％，P，S，Al，N，O，Nb：0.001％ 至0.065％，V：0.001％至0.065％，Ti：0.001％至0.033％，Ca：0.0001％至0.0035％，余量为Fe和杂质，Pcm为0.20以下。
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公开(公告)号：US11326240B2
公开(公告)日：2022-05-10
申请号：US16480803
申请日：2017-12-14
IPC分类号： C22C38/58 , C21D8/02 , C21D9/08 , C21D9/46 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： There is provided a hot-rolled steel sheet suitable for manufacturing an electric resistance welded steel tube, having workability necessary for roll forming and high yield strength, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after electric resistance welding. The steel sheet includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N contained at a specific content. The steel sheet has a microstructure containing 3% to 20% martensite and 10% or less retained austenite on a volume fraction basis, the remainder being bainite. The yield strength is set to 600 MPa or more, the tensile strength is set to 950 MPa or more, and the uniform elongation is set to 7.0% or more.
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公开(公告)号：US20200063227A1
公开(公告)日：2020-02-27
申请号：US16485978
申请日：2018-02-06
摘要： There are provided a high-strength hot-rolled steel sheet having a tensile strength of 980 MPa or more and a production method therefor. The high-strength hot-rolled steel sheet has a predetermined component composition and a microstructure containing 75.0% or more by area and less than 97.0% by area of a primary phase composed of an upper bainite phase, the primary phase having an average grain size of 12.0 μm or less, and more than 3.0% by area and 25.0% or less by area of a secondary phase that is a structure composed of one or two of a lower bainite phase and/or a tempered martensite phase, and a martensite phase, in which the number density of grains of the secondary phase having an equivalent circular diameter of 0.5 μm or more is 150,000 grains/mm2 or less, and the steel sheet has an arithmetic mean surface roughness of 2.00 μm or less.
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公开(公告)号：US20180030557A1
公开(公告)日：2018-02-01
申请号：US15554937
申请日：2016-02-18
发明人： Sota Goto , Shunsuke Toyoda , Takatoshi Okabe
IPC分类号： C21D8/02
CPC分类号： C21D8/02 , B21C37/08 , B23K11/002 , B23K11/02 , B23K11/0873 , B23K11/16 , B23K13/025 , B23K31/027 , B23K2101/06 , B23K2101/18 , B23K2103/04 , C21D8/105 , C21D9/08 , C21D9/50 , C21D2211/005 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/30 , C22C38/38 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/58 , F16L9/17 , Y02P10/212
摘要： Provided is a high-strength electric resistance welded steel pipe having excellent bendability and which includes a composition containing, on a mass % basis, C: 0.04% to 0.15%, Si: 0.10% to 0.50%, Mn: 1.0% to 2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2% to 1.0%, Ti: 0.005% to 0.030%, and Al: 0.010% to 0.050%, the balance being Fe and unavoidable impurities, and a microstructure including polygonal ferrite with a volume fraction of 70% or more and retained austenite with a volume fraction of 3% to 20%, the balance being at least one selected from martensite, bainite, and pearlite, wherein the polygonal ferrite has an average grain size of 5 μm or more and an aspect ratio of 1.40 or less.
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7.发明申请HEAVY WALL ELECTRIC RESISTANCE WELDED STEEL PIPE FOR LINE PIPE AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED) 审中-公开用于线管的重型电绝缘焊接钢管及其制造方法（如修改）公开(公告)号：US20160153063A1
公开(公告)日：2016-06-02
申请号：US14903804
申请日：2014-07-08
发明人： Sota Goto , Shunsuke Toyoda , Takatoshi Okabe
IPC分类号： C21D9/08 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D1/42 , C21D8/10 , C21D8/02 , C21D9/50 , C21D6/00 , B23K11/087 , C22C38/38
CPC分类号： C21D9/085 , B23K11/0873 , C21D1/42 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/105 , C21D9/08 , C21D9/50 , C21D9/505 , C21D2211/002 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/58 , Y02P10/253
摘要： By using, as a raw material, a thick hot-rolled steel sheet having a chemical composition containing, by mass %, C: 0.02% or more and 0.10% or less, Si: 0.05% or more and 0.30% or less, Mn: 0.80% or more and 2.00% or less, and Nb: 0.010% or more and 0.100% or less and satisfying the condition that a carbon equivalent Ceq is 0.25% or more and 0.50% or less, a microstructure including a bainitic ferrite phase and/or a bainite phase, a high strength of 52 ksi or more in terms of yield strength and a high toughness of −45° C. or lower in terms of fracture transition temperature vTrs, and satisfying the condition that the ratio of the average crystal grain size of the coarsest-grain portion to the average crystal grain size of the finest-grain portion is 2.0 or less in every portion in the wall thickness direction is obtained
摘要翻译： 通过使用以质量％计含有C：0.02％以上且0.10％以下，Si：0.05％以上且0.30％以下的化学成分的粗制热轧钢板作为原料，使用Mn ：0.80％以上且2.00％以下，Nb：0.010％以上且0.100％以下，并且满足碳当量为0.005％以上且0.50％以下的条件，包含贝氏体铁素体相 和/或贝氏体相，在屈服强度方面为52ksi以上的高强度，在断裂转变温度vTrs方面为-45℃以下的高韧性或更低的韧性，并且满足以下条件：平均值 获得最细粒部分的晶粒尺寸与最细粒部分的平均晶粒尺寸在壁厚方向的每一部分中为2.0以下
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公开(公告)号：US20210129491A1
公开(公告)日：2021-05-06
申请号：US16491717
申请日：2018-02-26
发明人： Sota Goto , Kazuhiko Yamazaki , Taro Kizu , Shunsuke Toyoda
IPC分类号： B32B15/01 , C23C2/06 , C23C2/28 , C23C2/40 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/22 , C22C38/06 , C22C38/02 , C22C38/00 , C21D9/46 , C21D8/02 , C21D6/00
摘要： Provided is a high-strength hot-rolled coated steel sheet with excellent formability,
A high-strength hot-rolled coated steel sheet has a constituent composition containing, in a mass percent, C: 0.03% to 0.15%, Si: 0.4% or less, Mn: 1.2% to 1.9%, Ti: 0.05% to 0.25%, B: 0.0005% to 0.0050%, P: 0.03% or less, S: 0.005% or less, Al: 0.005% to 0.4%, and N: 0.01% or less, the balance being Fe and incidental impurities. The total area fraction of one or more of ferrite and tempered bainite is 90% or more. The steel sheet has a structure in which the volume fraction of Ti carbides having particle sizes of 20 nm or less is 0.05 vol % or more.-
公开(公告)号：US10815547B2
公开(公告)日：2020-10-27
申请号：US15554821
申请日：2016-03-01
发明人： Taro Kizu , Shunsuke Toyoda , Akimasa Kido , Tetsushi Tadani
IPC分类号： C21D9/46 , C22C38/14 , C22C38/60 , C22C38/00 , C21D8/02 , C22C38/06 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass %, C: 0.05% to 0.30%, Si: 0.6% to 2.0%, Mn: 1.3% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 2.0% or less, N: 0.010% or less, and one or more of Ti, Nb, and V: 0.01% to 1.0% each, with a balance being Fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated Fe of 0.04 mass % or more; and a precipitate with a particle size of less than 20 nm, wherein C* and C*p satisfy specific conditions.
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公开(公告)号：US20200232074A1
公开(公告)日：2020-07-23
申请号：US16486908
申请日：2018-02-13
摘要： Provided are a high-carbon hot-rolled steel sheet with excellent formability and hardenability and a method for manufacturing the same.The high-carbon hot-rolled steel sheet has a composition containing, on a mass basis, C: 0.10% to 0.33%, Si: 0.15% to 0.35%, Mn: 0.5% to 0.9%, P: 0.03% or less, S: 0.010% or less, sol. Al: 0.10% or less, N: 0.0065% or less, and Cr: 0.90% to 1.5%, the remainder being Fe and inevitable impurities, has a microstructure containing ferrite and cementite, a cementite density being 0.25 grains/μm2 or less, and has a hardness of 110 HV to 160 HV and a total elongation of 40% or more.
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