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公开(公告)号：EP4148149A1
公开(公告)日：2023-03-15
申请号：EP21799825.1
申请日：2021-04-21
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：EP3584349A1
公开(公告)日：2019-12-25
申请号：EP18755033.0
申请日：2018-02-20
发明人： TODA, Yuri , ABUKAWA, Genki , MAEDA, Daisuke , HIKIDA, Kazuo , FUJINAKA, Shingo
摘要： There is provided a hot stamped body including a middle part in sheet thickness and a surface layer arranged at both sides or one side of the middle part in sheet thickness, further including an intermediate layer formed between the middle part in sheet thickness and each surface layer so as to adjoin them, wherein the middle part in sheet thickness has a predetermined composition, the middle part in sheet thickness has a hardness of 500Hv or more and 800Hv or less, the surface layer has a hardness change ΔH 1 in the sheet thickness direction of 10Hv or more and less than 200Hv, and the intermediate layer has a hardness change ΔH 2 in the sheet thickness direction of 50Hv or more and less than 200Hv.
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公开(公告)号：EP3584345A1
公开(公告)日：2019-12-25
申请号：EP18754731.0
申请日：2018-02-20
发明人： TODA, Yuri , ABUKAWA, Genki , MAEDA, Daisuke , HIKIDA, Kazuo , FUJINAKA, Shingo
摘要： The present invention, in consideration of the problems in the prior art, provides a hot stamped body simultaneously achieving the high bendability and high ductility for realizing impact resistance and also hydrogen embrittlement resistance and kept down in scattering in hardness. The hot stamped body according to the present invention is provided with a middle part in sheet thickness and a softened layer arranged at both sides or one side of the middle part in sheet thickness. The middle part in sheet thickness has a hardness of 500Hv to 800Hv and has metal structures from a depth of 20 µm below the surface of the softened layer to a depth of 1/2 of the thickness of the softened layer with an area rate of a total of crystal grains with a maximum crystal orientation difference inside the crystal grains of 1° or less and crystal grains with a maximum crystal orientation difference inside the crystal grains of 8° or more and 15° or less of 50% or more and less than 85%, when a region surrounded by grain boundaries having an orientation difference of 15° or more in a cross-section parallel to the sheet thickness direction is defined as a "crystal grain".
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公开(公告)号：EP3584344A1
公开(公告)日：2019-12-25
申请号：EP18754730.2
申请日：2018-02-20
发明人： NAKANO, Katsuya , SUZUKI, Yuya , ABUKAWA, Genki , HAYASHI, Kunio
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 0.60 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：EP4083241A1
公开(公告)日：2022-11-02
申请号：EP20907194.3
申请日：2020-12-15
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 × 10 9 pieces/mm 3 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：EP3584348A1
公开(公告)日：2019-12-25
申请号：EP18755032.2
申请日：2018-02-20
发明人： SUZUKI, Yuya , NAKANO, Katsuya , ABUKAWA, Genki , HAYASHI, Kunio
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：EP3584341A1
公开(公告)日：2019-12-25
申请号：EP18754038.0
申请日：2018-02-20
发明人： TODA, Yuri , ABUKAWA, Genki , MAEDA, Daisuke , HIKIDA, Kazuo
摘要： There is provided a hot stamped body including a middle part in sheet thickness and a surface layer arranged at both sides or one side of the middle part in sheet thickness, further including an intermediate layer formed between the middle part in sheet thickness and each surface layer so as to adjoin them, wherein the middle part in sheet thickness has a predetermined composition, the middle part in sheet thickness has a hardness of 500Hv or more and 800Hv or less, the surface layer has a hardness change ΔH 1 in the sheet thickness direction of 100Hv or more and less than 200Hv, and the intermediate layer has a hardness change ΔH 2 in the sheet thickness direction of 10Hv or more and less than 50Hv.
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公开(公告)号：EP4108792A1
公开(公告)日：2022-12-28
申请号：EP21757011.8
申请日：2021-02-19
发明人： ABUKAWA, Genki , AZUMA, Masafumi , YABU, Shohei
摘要： This hot-rolled steel sheet has a predetermined chemical composition, the microstructure includes, by volume percentage, 70% or more of martensite, tempered martensite, and bainite in total and 5% to 20% of residual austenite, in a surface layer region that is a range from a surface to a position at 1/10 of a sheet thickness, a sum of an average pole density of an orientation group consisting of {211} to {111} and a pole density of a crystal orientation of {1101 is 6.0 or less, a concentration of solid solution carbon in the residual austenite is 0.5 mass% or more, and a tensile strength is 980 MPa or more.
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公开(公告)号：EP3584347A1
公开(公告)日：2019-12-25
申请号：EP18755031.4
申请日：2018-02-20
发明人： TAKEDA, Kengo , OKAMOTO, Riki , HIKIDA, Kazuo , NAKANO, Katsuya , SUZUKI, Yuya , ABUKAWA, Genki
摘要： The present invention has as its technical problem the provision of a clad steel sheet having a top layer with an average micro-Vickers hardness of 400HV or more while being excellent in bending resistance. The steel sheet of the present invention is steel sheet including an inner layer and a hard layer formed on one or both surfaces of the inner layer, wherein a content of C in the hard layer is more than a content of C in the inner layer and a content of Mn in the hard layer is more than a content of 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 2/5 or less of the entire sheet thickness, an average micro-Vickers hardness of the hard layer is 400HV or more and less than 800HV, an average micro-Vickers hardness of the inner layer is 350HV or more and is 50HV or more smaller than a hardness of the hard layer, and a screw dislocation density of the inner layer is 2.0×10 13 m/m 3 or more.
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公开(公告)号：EP3584340A1
公开(公告)日：2019-12-25
申请号：EP18754037.2
申请日：2018-02-20
发明人： TAKEDA, Kengo , OKAMOTO, Riki , HIKIDA, Kazuo , NAKANO, Katsuya , SUZUKI, Yuya , ABUKAWA, Genki
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 µm 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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