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公开(公告)号：US20220195554A1
公开(公告)日：2022-06-23
申请号：US17603726
申请日：2020-07-08
发明人： Genki ABUKAWA , Hiroshi SHUTO
摘要： A high strength steel sheet according to the present invention contains a predetermined chemical composition, in a metallographic structure, the total area ratio of tempered martensite and bainite is 80% or more, at a sheet thickness ¼ position of a cross section parallel to a rolling direction and perpendicular to a rolled surface, the standard deviation of number densities of precipitates having a diameter of 10 nm or less and including one or both of Ti and Nb is less than 5×1010 numbers/mm3, and the tensile strength is 780 MPa or more.
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公开(公告)号：US20220177995A1
公开(公告)日：2022-06-09
申请号：US17601799
申请日：2020-07-08
发明人： Genki ABUKAWA , Hiroshi SHUTO
IPC分类号： C21D9/46 , C22C38/38 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00
摘要： A high strength steel sheet according to the present invention contains a predetermined chemical composition, a metallographic structure includes, by an area ratio, ferrite: 20% to 70%, residual austenite: 5% to 40%, fresh martensite: 0% to 30%, tempered martensite and bainite: 20% to 75% in total, and pearlite and cementite: 0% to 10% in total, in a range of a ⅛ thickness to a ⅜ thickness from a surface, a number proportion of residual austenite having an aspect ratio of 2.0 or more with respect to the number of all residual austenite is 50% or more, at a sheet thickness ¼ position of a cross section parallel to a rolling direction and perpendicular to the surface, a standard deviation of area ratios of ferrite measured at 10 points every 50 mm along a width direction is less than 10%, and a tensile strength is 780 MPa or more.
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公开(公告)号：US20200232058A1
公开(公告)日：2020-07-23
申请号：US16487009
申请日：2018-02-20
发明人： Kengo TAKEDA , Riki OKAMOTO , Kazuo HIKIDA , Katsuya NAKANO , Yuya SUZUKI , Genki ABUKAWA
IPC分类号： C21D9/46 , B32B15/01 , C22C38/58 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/34 , C22C38/06 , C22C38/00 , C22C38/60 , C21D8/02 , C21D6/00
摘要： There is provided a steel sheet including an inner layer and a hard layer formed on one or both surfaces of the inner layer, wherein each content of C and Mn in the hard layer is more than each content of C and Mn in the inner layer, a thickness of the hard layer is 20 μm or more and a total of the thickness of the hard layer is ⅖ or less of the entire sheet thickness, an average micro-Vickers hardness of the hard layer is 400 HV or more and less than 800 HV, an average micro-Vickers hardness of the inner layer is 350 HV or more and is 50 HV or more smaller than a hardness of the hard layer, and a screw dislocation density of the inner layer is 2.0×1013 m/m3 or more.
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公开(公告)号：US20200010919A1
公开(公告)日：2020-01-09
申请号：US16487043
申请日：2018-02-20
发明人： Yuya SUZUKI , Katsuya NAKANO , Genki ABUKAWA , Kunio HAYASHI
摘要： High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness, wherein each soft surface layer has a thickness of more than 10 μM and 30% or less of the sheet thickness, the soft surface layer has an average Vickers hardness of more than 0.60 time and 0.90 time or less the average Vickers hardness of the sheet thickness 1/2 position, and the soft surface layer has a nano-hardness standard deviation of 0.8 or less is provided.
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公开(公告)号：US20230097055A1
公开(公告)日：2023-03-30
申请号：US17794672
申请日：2021-04-21
发明人： Eisaku SAKURADA , Takashi YASUTOMI , Genki ABUKAWA
IPC分类号： C21D9/46 , C22C38/38 , C22C38/34 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C21D8/02
摘要： Adopted are a hot-rolled steel sheet having a predetermined chemical composition, in which a region, where a rotation angle between a normal line of a surface and a (011) pole near the normal line becomes 5° or less, is 0.150 or less from the surface in terms of a sheet thickness direction position standardized by a sheet thickness, and a region, where the rotation angle becomes 20° or more, is 0.250 or more from the surface in terms of the sheet thickness direction position standardized by the sheet thickness and a manufacturing method thereof.
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公开(公告)号：US20230002848A1
公开(公告)日：2023-01-05
申请号：US17784901
申请日：2020-12-15
发明人： Genki ABUKAWA , Masafumi AZUMA , Eisaku SAKURADA , Shohei YABU
IPC分类号： C21D9/46 , B32B15/01 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00
摘要： This hot-rolled steel sheet has a predetermined chemical composition, a microstructure includes 80% or more of tempered martensite by a volume percentage and a remainder consisting of one or more of ferrite, pearlite, bainite, fresh martensite, and residual austenite, the tempered martensite includes 5×109 pieces/mm3 or more of precipitates containing Ti and having an equivalent circle diameter of 5 nm or less per unit volume, in a surface layer region that is a range from a surface to a 1/10 position of a sheet thickness, a sum of an average pole density of a crystal orientation group consisting of {211} to {111} and a pole density in a crystal orientation of {110} is 6.0 or less, and a tensile strength is 980 MPa or more.
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公开(公告)号：US20210404040A1
公开(公告)日：2021-12-30
申请号：US17293010
申请日：2019-11-20
发明人： Genki ABUKAWA , Shohei YABU
IPC分类号： C22C38/58 , C22C38/02 , C22C38/06 , C22C38/54 , C22C38/46 , C22C38/42 , C22C38/52 , C22C38/44 , C22C38/00 , C21D8/02
摘要： A hot-rolled steel sheet includes, as chemical composition, C, Si, Mn, and sol.Al. In the hot-rolled steel sheet, a sum of an average of pole densities in a crystal orientation group consisting of {211} to {111} and a pole density in a crystal orientation of {110} is 0.5 to 6.0 in the surface region, and the tensile strength is 780 to 1370 MPa.
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公开(公告)号：US20200071799A1
公开(公告)日：2020-03-05
申请号：US16466610
申请日：2018-02-20
发明人： Kengo TAKEDA , Riki OKAMOTO , Kazuo HIKIDA , Katsuya NAKANO , Yuya SUZUKI , Genki ABUKAWA
摘要： Steel sheet low in cost and improved in fatigue characteristics without causing a drop in the cold formability, characterized in that it comprises an inner layer and a hard layer on one or both surfaces of the inner layer, a thickness of the hard layer is 20 μm or more and 40% or less of the thickness of the steel sheet, an average micro-Vickers hardness of the hard layer is 240 HV or more and less than 400 HV, an amount of C of the hard layer is 0.4 mass % or less, an amount of N is 0.02 mass % or less, a variation of hardness measured by a nanoindenter at a depth of 10 from the surface of the hard layer is a standard deviation of 2.0 or less, an average micro-Vickers hardness of the inner layer is 80 HV or more and less than 400 HV, a volume rate of carbides contained in the inner layer is less than 2.00%, and the average micro-Vickers hardness of the hard layer is 1.05 times or more the average micro-Vickers hardness of the inner layer.
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公开(公告)号：US20230295760A1
公开(公告)日：2023-09-21
申请号：US18018596
申请日：2021-09-10
CPC分类号： C21D9/46 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/20
摘要： This high-strength steel sheet contains predetermined chemical components, in a range from a surface to 1/10 of a sheet thickness in a sheet thickness direction, an average pole density of an orientation group 1 that is an orientation group expressed by ϕ1=0° to 90°, Φ=50° to 60° and ϕ2=45° in terms of an Euler angle is 1.5 or less, an average pole density of an orientation group 2 that is an orientation group expressed by ϕ1=450 to 85°, Φ=85° to 90° and ϕ2=45° in terms of the Euler angle is 1.5 or more, an S value that indicates a degree of randomness of surface properties is 7.5 or less, an E value that indicates a degree of concentration of the surface properties is 0.04 or more, and a tensile strength is 590 MPa or more.
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公开(公告)号：US20220389545A1
公开(公告)日：2022-12-08
申请号：US17295298
申请日：2019-11-20
发明人： Shohei YABU , Kunio HAYASHI , Yuji YAMAGUCHI , Marina MORI , Naoki INOUE , Genki ABUKAWA
摘要： A hot-rolled steel sheet includes, as chemical composition, C, Si, Mn, and sol.Al. In the hot-rolled steel sheet, an average of pole densities in crystal orientation group consisting of {110} to {110} in surface region is 0.5 to 3.0, a standard deviation of the pole densities in the crystal orientation group is 0.2 to 2.0, and the tensile strength is 780 to 1370 MPa.
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