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公开(公告)号：US20240167133A1
公开(公告)日：2024-05-23
申请号：US18285239
申请日：2021-06-22
发明人： Naoko KATOU , Eisaku SAKURADA , Hitoshi NIKAIDO
CPC分类号： C22C38/14 , C21D6/005 , C21D8/0226 , C21D8/0263 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： This hot-rolled steel sheet has a predetermined chemical composition and has a metallographic structure containing ferrite with an area ratio of 53.0% or more and 76.0% or less, martensite with an area ratio of 3.0% or more and 10.0% or less, bainite with an area ratio of 14.0% or more and 39.0% or less, and pearlite with an area ratio of 2.6% or less, and with an average diameter of martensite of 0.26 μm or more and 0.70 μm or less, wherein, among all interfaces of the martensite, the total length of the interfaces between the martensite and the bainite is 75.0% or more with respect to the total length of all interfaces of the martensite.
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公开(公告)号：US20210017620A1
公开(公告)日：2021-01-21
申请号：US16982003
申请日：2018-03-30
发明人： Takafumi YOKOYAMA , Riki OKAMOTO , Kohichi SANO , Hiroyuki KAWATA , Kohei UEDA , Eisaku SAKURADA
IPC分类号： C21D9/46 , C21D8/02 , C21D6/00 , C23C2/06 , C23C2/40 , C22C38/18 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/60 , C22C38/00 , B32B15/01
摘要： This steel sheet has a predetermined chemical composition, in which 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 includes hard ferrite, a number proportion of the retained austenite having an aspect ratio of 2.0 or more in the total retained austenite is 50% or more, a soft layer having a thickness of 1 to 100 μm from a surface in a sheet thickness direction is present, in ferrite contained in the soft layer, a volume fraction of grains having an aspect ratio of 3.0 or more is 50% or more, a volume fraction of retained austenite in the soft layer is 80% or less of the volume fraction of the retained austenite in the inside of the steel sheet, and a peak of an emission intensity at a wavelength indicating Si appears in a range of more than 0.2 μm and 10.0 μm or less from the surface.
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公开(公告)号：US20230140766A1
公开(公告)日：2023-05-04
申请号：US17908553
申请日：2021-04-21
发明人： Eisaku SAKURADA , Takashi YASUTOMI , Genki ABUKAWA
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C23C2/40 , B21C47/02
摘要： This hot-rolled steel sheet has a predetermined chemical composition and predetermined metallographic structure, a ratio between a maximum depth of a region where, on one surface, a rotation angle between a normal line of the one surface and a (011) pole near the normal line of the one surface is 5° or less and a maximum depth of a region where, on the other surface, a rotation angle between a normal line of the other surface and a (011) pole near the normal line of the other surface is 5° or less is 1.00 to 1.20, and a tensile strength is 1150 MPa or more.
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公开(公告)号：US20220186333A1
公开(公告)日：2022-06-16
申请号：US17430651
申请日：2020-03-19
IPC分类号： C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/46 , C22C38/54 , C21D8/02 , B21C47/02 , C23G1/00 , C23C2/40
摘要： A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 95% or more of tempered martensite and bainite in total, and a remainder consists of ferrite and pearlite, the microstructure contains 5.0×109 pieces/mm or more of, per unit volume, precipitate having an equivalent circle diameter of 5.0 nm or less and containing Ti, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 μm from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, a tensile strength is 980 MPa or more, and a product of the tensile strength and elongation is 12,000 MPa×% or more.
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公开(公告)号：US20230416859A1
公开(公告)日：2023-12-28
申请号：US18031104
申请日：2021-11-18
IPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18
CPC分类号： C21D9/46 , C21D2211/001 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D6/002 , C21D6/005 , C21D6/008 , C21D1/18 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009 , C22C38/38
摘要： This steel sheet has a predetermined chemical composition, has a microstructure in which a number density of alloy carbides present at grain boundaries and having a major axis of 10 to 100 nm is 1.0×108 to 1.0×1011/cm2 and a number density of alloy carbides present in grains and having a major axis of 10 nm or less is 1.0×1016 to 1.0×1019/cm3, and has a tensile strength of 1,030 MPa or more.
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公开(公告)号：US20230407430A1
公开(公告)日：2023-12-21
申请号：US18036996
申请日：2021-11-19
发明人： Takashi YASUTOMI , Eisaku SAKURADA
IPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18
CPC分类号： C21D9/46 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D8/0205 , C21D8/0226 , C21D8/0263 , C21D6/002 , C21D6/005 , C21D6/008 , C21D1/18 , C21D8/021 , C21D8/0278 , C21D2211/002 , C21D2211/008
摘要： This steel sheet has predetermined chemical composition and microstructure, in a crystal orientation distribution function of a texture at a sheet thickness ¼ position, when A/B that is a ratio of a maximum value A of pole densities at Φ=20° to 60° and φ1=30° to 90° in a cross section of φ2=45° to a maximum value B of pole densities at Φ=120° to 60° and φ1=30° to 90° in the cross section of φ2=45° is 1.50 or less, a total of the maximum value A and the maximum value B is 6.00 or less, and a tensile strength is 1030 MPa or more.
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公开(公告)号：US20210340653A1
公开(公告)日：2021-11-04
申请号：US17312853
申请日：2018-12-11
IPC分类号： C22C38/58 , C22C38/02 , C22C38/00 , C22C38/06 , C22C38/50 , C22C38/42 , C22C38/46 , C22C38/48 , C22C38/44 , C22C38/54 , C21D8/02 , C21D9/46 , C23C2/06 , C23C2/40
摘要： A high-strength steel sheet excellent in formability, toughness and weldability has a chemical composition including: by mass %, C: 0.05 to 0.30%, Si: 2.50% or less, Mn: 0.50 to 3.50%, P: 0.100% or less, S: 0.0100% or less, Al: 0.001 to 2.500%, N: 0.0150% or less, O: 0.0050% or less, and the balance consisting of Fe and inevitable impurities. The high-strength steel sheet has a microstructure in a region from ⅛t (t: sheet thickness) to ⅜t (t: sheet thickness) from a steel sheet surface, the microstructure including: by volume %, acicular ferrite (3): 20% or more, and martensite (4):10% or more, aggregated ferrite: 20% or less, residual austenite: 2.0% or less, and the martensite satisfies a formula (A), ∑ i = 1 5 d i a i 1.5 ≤ 10.0 ( A )
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公开(公告)号：US20240068066A1
公开(公告)日：2024-02-29
申请号：US18280105
申请日：2022-02-22
发明人： Yasuaki TANAKA , Shohei YABU , Hiroshi SHUTO , Koutarou HAYASHI , Takashi YASUTOMI , Eisaku SAKURADA
CPC分类号： C21D9/46 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14 , C22C38/60
摘要： There is provided a steel sheet having a chemical composition comprising, in mass %, C: 0.05 to 0.25%, Si: 0.2 to 2.0%, Mn: 1.2 to 3.0%, P: 0.030% or less, S: 0.050% or less, Al: 0.01 to 0.55%, N: 0.0100% or less, and Ti: 0.010 to 0.250%, with the balance: Fe and impurities, wherein a random intensity ratio of a texture in a near-surface portion of the steel sheet is 8.0 or less, and a minimum angle formed between a maximum strength orientation in a {110} pole figure of the texture and a normal direction of a rolled surface of the steel sheet is 10° or less.
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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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