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公开(公告)号：US11939650B2
公开(公告)日：2024-03-26
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
CPC分类号： C22C38/06 , C21D8/0205 , C21D8/0226 , C21D9/46 , C22C38/02 , C22C38/04 , C21D2201/05
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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公开(公告)号：US10822683B2
公开(公告)日：2020-11-03
申请号：US15521535
申请日：2015-11-05
发明人： Hiroyuki Kawata , Takeshi Yasui , Kohei Ueda , Naoki Maruyama , Yuji Yamaguchi , Satoshi Uchida , Ryosuke Komami , Hayato Arai , Toyomitsu Nakamura
IPC分类号： B32B15/01 , C23C2/06 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/08 , C22C38/18 , C21D9/46 , C21D8/02 , C22C38/58 , C23C2/02 , C23C2/28 , C22C38/16
摘要： A hot-dip galvanized steel sheet includes a base steel sheet and a hot-dip galvanized layer formed on at least one surface of the base steel sheet, in which the hot-dip galvanized layer includes Fe in a content of more than 0% to 5% or less, Al in a content of more than 0% to 1.0% or less, and columnar grains formed by a ζ phase on the surface of the steel sheet, further, 20% or more of the entire interface between the hot-dip galvanized layer and the base steel sheet is coated with the ζ phase, and a ratio of an interface formed between ζ grains in which coarse oxides are present among grains and the base steel sheet with respect to the entire interface between the ζ phase and the base steel sheet in the hot-dip galvanized layer is 50% or less, the base steel sheet has predetermined chemical components and a refined layer in direct contact with the interface between the base steel sheet and the hot-dip galvanized layer, an average thickness of the refined layer is 0.1 to 5.0 μm, an average grain size of ferrite in the refined layer is 0.1 to 3.0 μm, one or two or more of oxides of Si and Mn are contained in the refined layer, and a maximum size of the oxide is 0.01 to 0.4 μm, and a volume fraction of residual austenite in a range of ⅛ thickness to ⅜ thickness centered at a position of ¼ thickness from the surface of the base steel sheet is 1% or more.
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公开(公告)号：US11814708B2
公开(公告)日：2023-11-14
申请号：US17421317
申请日：2020-02-06
IPC分类号： C22C38/06 , C22C38/58 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/54
CPC分类号： C22C38/58 , C21D8/0205 , C21D8/0226 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/54 , C21D2211/001 , C21D2211/002 , C21D2211/003 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： Provided are a hot dip galvanized steel sheet comprising a base steel sheet and a hot dip galvanized layer on at least one surface of the base metal steel sheet, wherein the base steel sheet has a predetermined chemical composition and contains, by volume fraction, ferrite: 0% to 50%, retained austenite: 6% to 30%, bainite: 5% or more, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, a number density of tempered martensite with a circle equivalent diameter of 5.0 μm or more is 20/1000 μm2 or less, and an area ratio of fresh martensite with a circle equivalent diameter of 2.0 μm or more after imparting 5% plastic strain is 10% or less, and a method for producing the same.
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公开(公告)号：US11268181B2
公开(公告)日：2022-03-08
申请号：US16633529
申请日：2017-07-31
IPC分类号： C22C38/06 , C22C38/04 , C22C38/00 , C22C38/02 , C23C2/06 , C23C2/40 , C23C2/02 , B32B15/01 , C21D9/48 , C21D8/04 , C21D6/00 , C23C2/28 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C21D8/02 , C21D9/46 , C22C38/58 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/54 , C22C38/20 , C22C38/22 , C22C38/26 , B32B15/04 , C22C38/24 , C22C38/50 , C22C38/28 , C22C38/38 , C22C38/40 , C22C38/46 , B32B15/18 , C22C38/32 , C23C30/00 , C23C2/12 , C23C2/26 , C23C28/00 , C23C28/02
摘要： A hot-dip galvanized steel sheet including: a hot-dip galvanizing layer on at least one side of a base steel sheet. The hot-dip galvanizing layer has a Fe content of more than 0% to 3.0% and an Al content of more than 0% to 1.0%. The hot-dip galvanized steel sheet includes a Fe—Al alloy layer provided on an interface between the hot-dip galvanizing layer and the base steel sheet and a fine-grain layer provided in the base steel sheet and directly in contact with the Fe—Al alloy layer. The Fe—Al alloy layer has a thickness of 0.1-2.0 μm. The fine-grain layer has an average thickness of 0.1-5.0 μm, includes a ferrite phase with an average grain diameter of 0.1-3.0 μm, and contains oxides of one or more out of Si and Mn, a maximum diameter of the oxides being 0.01-0.4 μm.
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公开(公告)号：US11236412B2
公开(公告)日：2022-02-01
申请号：US16315120
申请日：2017-08-04
发明人： Kohichi Sano , Makoto Uno , Ryoichi Nishiyama , Yuji Yamaguchi , Natsuko Sugiura , Masahiro Nakata
IPC分类号： C21D9/46 , C22C38/38 , C22C38/00 , C22C38/58 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/26 , C22C38/28 , C23C2/06 , C23C2/40 , C21D8/02
摘要： A steel sheet has a specific chemical composition and has a structure represented by, by area ratio, ferrite: 30 to 95%, and bainite: 5 to 70%. When a region that is surrounded by a grain boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more is defined as a crystal grain, the proportion of crystal grains each having an intragranular misorientation of 5 to 14° to all crystal grains is 20 to 100% by area ratio. An average aspect ratio of ellipses equivalent to the crystal grains is 5 or less. An average distribution density of the total of Ti-based carbides and Nb-based carbides each having a grain size of 20 nm or more on ferrite grain boundaries is 10 carbides/μm or less.
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公开(公告)号：US11447848B2
公开(公告)日：2022-09-20
申请号：US17041372
申请日：2018-03-30
发明人： Takafumi Yokoyama , Kohichi Sano , Riki Okamoto , Hiroyuki Kawata , Eisaku Sakurada , Yuji Yamaguchi , Kazuki Shiokawa , Yuichi Nakahira , Kohei Ueda , Masahiro Nakata , Satoshi Uchida
IPC分类号： C21D8/02 , C21D9/00 , C22C38/58 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/52 , C22C38/54 , C23C2/06 , C23C2/40
摘要： A steel sheet wherein a steel structure of an inside of the steel sheet contains, by volume fraction, soft ferrite: 0% to 30%, retained austenite: 3% to 40%, fresh martensite: 0% to 30%, a sum of pearlite and cementite: 0% to 10%, and a remainder including hard ferrite. In the steel sheet, in a ⅛ to ⅜ thickness range, a proportion of retained austenite having an aspect ratio of 2.0 or more is 50% or more, and a soft layer having a thickness of 1 to 100 μm from a surface in a sheet thickness direction is present. When an emission intensity at a wavelength indicating Si is analyzed in the sheet thickness direction from the surface by a radio-frequency glow discharge analysis method, a peak of the emission intensity appears in a range of more than 0.2 μm and 5.0 μm or less from the surface.
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公开(公告)号：US11332803B2
公开(公告)日：2022-05-17
申请号：US16603658
申请日：2018-03-22
发明人： Takafumi Yokoyama , Yuji Yamaguchi , Masahiro Nakata , Kunio Hayashi , Satoshi Uchida , Takuma Kawanaka
IPC分类号： C21D9/46 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/28 , C22C38/32 , C23C2/06 , C23C2/28 , C23C2/40 , B32B15/18 , C22C38/38 , C22C38/16 , C22C38/40 , C22C38/08 , C22C38/20 , B32B15/01 , C22C38/12 , B32B15/04
摘要： A high-strength hot-dip galvanized steel sheet contains predetermined amounts of C, Si, Mn, P, S, N, O, sol. Al, Ti, and B, 0.1 to 1.5 mass % of Cr+2×Mo, and a balance in a form of Fe and inevitable impurities. A steel structure includes, in area %, ferrite: 1 to 50%, martensite: 20 to 70%, residual austenite: 0 to 5%, pearlite: 0 to 5%, MA and cementite having 0.2 μm or more grain size: 0 to 5% in total, and a balance in a form of bainite. A number density of MA or cementite having 0.2 μm or more grain size and isolated in ferrite or bainite grains is 100 pcs/1000 μm2 or less, and an average hardness of martensite is in a range from 330 to 500 Hv.
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公开(公告)号：US11118252B2
公开(公告)日：2021-09-14
申请号：US17043283
申请日：2018-03-30
发明人： Kohichi Sano , Hiroyuki Kawata , Yuji Yamaguchi , Satoshi Uchida , Yoshinori Imai , Riki Okamoto
IPC分类号： C22C38/60 , C22C38/58 , C22C38/48 , C22C38/44 , C22C38/14 , C22C38/12 , C22C38/16 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/08 , B32B15/01 , C23C2/28 , C23C2/40 , C23C2/06 , C21D9/46 , C21D8/02 , C21D6/00 , C21D1/76 , C22C38/54 , C22C38/50 , C22C38/46 , C22C38/42 , C22C38/20 , C22C38/24 , C22C38/28 , C22C38/38 , B32B15/04 , C22C38/22 , C22C38/26 , C22C38/18 , C22C38/40 , C22C38/34 , C22C38/32 , B32B15/18 , C23C30/00 , C23C28/02 , C23C2/26 , C23C2/02
摘要： A steel sheet includes a hot-dip galvanized layer or a galvannealed layer on a surface of the steel sheet, the steel sheet including: in mass %, C: 0.06% or more and 0.22% or less; Si: 0.50% or more and 2.00% or less; Mn: 1.50% or more and 2.80% or less; Al: 0.02% or more and 1.00% or less; P: 0.001% or more and 0.100% or less; S: 0.0005% or more and 0.0100% or less; N: 0.0005% or more and 0.0100% or less; and a balance: Fe and impurities.
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公开(公告)号：US11685963B2
公开(公告)日：2023-06-27
申请号：US17051110
申请日：2019-04-26
IPC分类号： C21D9/46 , B32B15/01 , C21D1/26 , C21D6/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/30 , C22C38/38 , C22C38/60 , C23C2/06 , C23C2/28 , C23C2/40
CPC分类号： C21D9/46 , B32B15/013 , C21D1/26 , C21D6/004 , C21D6/005 , C21D6/007 , C21D6/008 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/30 , C22C38/38 , C22C38/60 , C23C2/06 , C23C2/28 , C23C2/40 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： A zinc-plated steel sheet of an aspect of the present invention includes a steel sheet having a predetermined chemical composition and a zinc-plated layer. In the steel sheet, steel microstructures in a range of ⅛ thickness to ⅜ thickness, having the center at ¼ thickness from a steel sheet surface, include, by vol %, ferrite: 0% to 10%, bainite: 0% to 20%, tempered martensite: 70% or more, fresh martensite: 0% to 10%, retained austenite: 0% to 10%, and pearlite: 0% to 5%. In the zinc-plated steel sheet, the amount of hydrogen emitted when the steel sheet is heated to 200° C. from a room temperature after removal of the zinc-plated layer is 0.40 ppm or less per mass of the steel sheet, the tensile strength is 1470 MPa or more, and no cracking occurs in a U-shape bending test where a stress equivalent to 1000 MPa is applied for 24 hours.
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公开(公告)号：US11426975B2
公开(公告)日：2022-08-30
申请号：US16635499
申请日：2017-07-31
IPC分类号： B32B15/01 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/08 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C21D6/00 , C21D8/02 , C21D9/46 , C23C2/06 , C23C2/40
摘要： In a thickness range of which center is a ¼ thickness from the surface of a base steel sheet, a volume fraction of a ferrite phase is 0% to less than 50%, a volume fraction of the total of a hard structure composed of one or more of a bainite structure, a bainitic ferrite phase, a fresh martensite phase, and a tempered martensite phase is 50% or more, a volume fraction of a retained austenite phase is 0-8%, and a volume fraction of the total of a pearlite phase and a coarse cementite phase is 0-8%, at an interface between a plating layer and the base steel sheet, a Fe—Al alloy layer is provided, the Fe—Al alloy layer having an average thickness of 0.1-2.0 μm and a difference between a maximum thickness and a minimum thickness in the width direction of the steel sheet being within 0.5 μm.
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