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公开(公告)号：US20210017622A1
公开(公告)日：2021-01-21
申请号：US17043267
申请日：2018-03-30
Applicant: NIPPON STEEL CORPORATION
Inventor： Jun HAGA , Kohichi SANO , Koutarou HAYASHI , Kunio HAYASHI , Masaharu KAMEDA , Akihiro UENISHI , Hiroyuki KAWATA
IPC: C21D9/46 , B32B15/01 , C22C38/38 , C22C38/32 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D6/00 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40
Abstract: A hot dip galvanized steel sheet and hot dip galvannealed steel sheet improved in uniform ductility and local ductility, yield strength and tensile strength, and low temperature impact property, characterized by having a predetermined chemical composition, having a metal structure containing, by volume %, retained austenite: over 5.0% and tempered martensite: over 5.0%, having retained austenite containing C: 0.85 mass % or more, and having a ratio [C]γgb/[P]γgb of an amount of segregation of C (number of atoms/nm2): [C]γgb to an amount of segregation of P (number of atoms/nm2): [P]γgb at prior austenite grain boundaries of 4.0 or more.
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公开(公告)号：US20240270325A1
公开(公告)日：2024-08-15
申请号：US18563240
申请日：2022-05-25
Applicant: NIPPON STEEL CORPORATION
Inventor： Masahiro KUBO , Shunji HIWATASHI , Yutaka MIKAZUKI , Koichi SATO , Takahiro AITOH , Kengo TAKEDA , Katsuya NAKANO , Yuri TODA , Shinichiro TABATA , Kodai MURASAWA , Daisuke MAEDA , Kazuo HIKIDA , Kazuhisa KUSUMI , Shingo FUJINAKA , Jun HAGA , Ryo TABATA , Ryoma KATO , Mitsuharu YAMAGATA , Toshiyuki NIWA , Hiromi ASAMA , Junichiro SUZUKI , Yasunori ITO
CPC classification number: B62D29/007 , B23K11/11 , C21D7/13 , C21D9/46 , C22C38/60 , B23K2103/04 , C21D2211/002 , C21D2211/008
Abstract: What is provided is an automobile body in which batteries, tires, and liquids containing water and oil are removed from a public road vehicle with superior collision safety, the public road vehicle comprising at least a steel material containing a steel sheet with a tensile strength of 1180 MPa or higher, a non-ferrous metal material, and a resin material, wherein
the ratio of a mass mh (kg) of the steel sheet having a tensile strength of 1180 MPa or higher to a mass m (kg) of the automobile body is 9% or higher, and
a mass m (kg) of the automobile body and a projected area s (m2) of the automobile body from an upper side satisfy a formula (1) and a formula (2)
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Patent Agency Ranking
公开(公告)号：US20240376580A1
公开(公告)日：2024-11-14
申请号：US18288478
申请日：2022-05-13
Applicant: NIPPON STEEL CORPORATION
Inventor： Jun HAGA
IPC: C22C38/32 , B21D22/02 , C21D1/84 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/22 , C22C38/26 , C22C38/28
Abstract: A steel sheet for hot stamping has a predetermined chemical composition, in which, when a Mo content of the steel sheet is measured by line analysis using an electron probe micro-analyzer (EPMA) in a range of 0.05 mm in a sheet thickness direction, in which a ¼ depth position of a sheet thickness of the steel sheet from a surface of the steel sheet is a center, a maximum value of the Mo content, a minimum value of the Mo content, and an average value of the Mo content satisfy ([Mo]MAX−[Mo]MIN)/[Mo]AVE
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公开(公告)号：US20230078690A1
公开(公告)日：2023-03-16
申请号：US17795741
申请日：2021-02-12
Applicant: NIPPON STEEL CORPORATION
Inventor： Jun HAGA
IPC: C22C38/32 , B21D22/02 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/20 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
Abstract: This hot-stamping formed article includes a steel sheet, all or part of the steel sheet has a predetermined chemical composition, at a ¼ depth position of a sheet thickness from a surface of the steel sheet, a microstructure contains, by vol %, more than 90.0% of martensite, the average value of Vickers hardness in a region that is 0.3 mm in a sheet thickness direction and 0.6 mm in a direction orthogonal to the sheet thickness direction is 670 or more, the standard deviation of the Vickers hardness in the region is 20 or less, and the tensile strength is 2300 MPa or more.
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公开(公告)号：US20250108424A1
公开(公告)日：2025-04-03
申请号：US18834189
申请日：2023-03-02
Applicant: NIPPON STEEL CORPORATION
Inventor： Shingo FUJINAKA , Jun HAGA , Yuri TODA
IPC: B21D22/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32
Abstract: This hot-stamping formed body has a predetermined chemical composition, in a surface layer region, an area ratio of bainite of more than 10%, a maximum value of pole density of a texture of 4.0 or less, and a deboronization index of 0.05 or more.
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公开(公告)号：US20250101557A1
公开(公告)日：2025-03-27
申请号：US18832024
申请日：2023-03-02
Applicant: NIPPON STEEL CORPORATION
Inventor： Yuri TODA , Shingo FUJINAKA , Jun HAGA , Yuma ASADA
Abstract: This hot-stamping formed body has a predetermined chemical composition, in an interior region, a standard deviation of grain sizes of prior austenite grains of 5.0 μm or less, in a surface layer region, an area ratio of bainite of more than 10%, a maximum value of pole density of a texture of 4.0 or less, and a deboronization index of 0.05 or more.
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公开(公告)号：US20200306812A1
公开(公告)日：2020-10-01
申请号：US16651659
申请日：2018-10-02
Applicant: NIPPON STEEL CORPORATION
Inventor： Jun HAGA , Kazuo HIKIDA
IPC: B21D22/02 , C21D8/02 , C21D9/46 , C23C2/06 , C23C2/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54
Abstract: The entirety or a part of this hot stamped product includes, as a chemical composition, by mass %, C: 0.001% or more and less than 0.080%, Si: 2.50% or less, Mn: 0.01% or more and less than 0.50%, P: 0.200% or less, S: 0.0200% or less, sol.Al: 0.001% to 2.500%, N: 0.0200% or less, Cr: 0.30% or more and less than 2.00%, and a remainder: Fe and impurities, in which a metallographic structure contains, by vol %, ferrite: more than 60.0%, martensite: 0% or more and less than 10.0%, and bainite: 0% or more and less than 20.0%, a tensile strength is less than 700 MPa, and ΔTS, which is a decrease in the tensile strength after a heat treatment at 170° C. for 20 minutes, is 100 MPa or less.
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