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公开(公告)号：US20230002874A1
公开(公告)日：2023-01-05
申请号：US17781231
申请日：2021-01-08
Applicant: NIPPON STEEL CORPORATION
Inventor： Yuri TODA , Shinichiro TABATA , Kodai MURASAWA , Daisuke MAEDA , Kazuo HIKIDA
IPC: C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/16 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00
Abstract: A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is 5% or more and less than 10%. Among grain boundaries of crystal grains of bainite and tempered martensite in the microstructure, a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and a grain boundary having a rotation angle in a range of 55° to 75° to the direction as a rotation axis is 30% or more. The tensile strength of the hot-stamping formed body is 1500 MPa or more.
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公开(公告)号：US20220219430A1
公开(公告)日：2022-07-14
申请号：US17612446
申请日：2020-05-29
Applicant: NIPPON STEEL CORPORATION
Inventor： Takehiro TAKAHASHI , Daisuke MAEDA , Hiroshi TAKEBAYASHI
Abstract: The present invention relates to a plated steel sheet for hot stamping comprising a steel sheet and a Zn—Ni plating layer formed on at least one surface of the steel sheet, wherein the Zn—Ni plating layer has an Ni concentration of 8 mass % or more, a plating deposition amount of 10 g/m2 or more and 90 g/m2 or less per surface, and an average grain size of 50 nm or less.
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公开(公告)号：US20220170128A1
公开(公告)日：2022-06-02
申请号：US17442334
申请日：2020-05-13
Applicant: NIPPON STEEL CORPORATION
Inventor： Daisuke MAEDA , Yuri TODA , Kazuo HIKIDA
IPC: C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/60 , C23C2/06 , C23C2/40 , C21D8/02
Abstract: A steel sheet for hot stamping includes: a steel sheet having a predetermined chemical composition; and a plating layer provided on a surface of the steel sheet, the plating layer having an adhesion amount of 10 g/m2 to 90 g/m2 and a Ni content of 10 mass % to 25 mass %, and containing a remainder consisting of Zn and impurities. The steel sheet for hot stamping includes, in a surface layer region of the steel sheet, 80% or more by area % of grains having an average crystal orientation difference of 0.4° to 3.0° inside grains surrounded by grain boundaries having an average crystal orientation difference of 5° or more.
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公开(公告)号：US20220127705A1
公开(公告)日：2022-04-28
申请号：US17424119
申请日：2020-03-19
Applicant: NIPPON STEEL CORPORATION
Inventor： Shingo FUJINAKA , Yuri TODA , Daisuke MAEDA
IPC: C22C38/32 , B21D22/02 , B32B15/01 , C22C38/30 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/00 , C21D6/00
Abstract: A hot-stamping formed body has a predetermined chemical composition and a microstructure including, by area ratio, 90% to 100% of martensite and 0% to 10% of a remainder in the microstructure. In the microstructure, a region in which an average GAIQ value in a unit grain is 60,000 or more is 30 area % or more, and a number density of carbides having a circle equivalent diameter of 0.20 μm or more is 50/mm2 or less.
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公开(公告)号：US20220119929A1
公开(公告)日：2022-04-21
申请号：US17431324
申请日：2020-03-19
Applicant: NIPPON STEEL CORPORATION
Inventor： Shingo FUJINAKA , Yuri TODA , Daisuke MAEDA
IPC: C22C38/58 , C22C38/02 , C22C38/06 , C22C38/00 , C22C38/54 , C22C38/52 , C22C38/50 , C22C38/46 , C22C38/48 , C22C38/44 , B21D22/02
Abstract: A hot-stamping formed body has a predetermined chemical composition, in which an average grain size of prior austenite grains in a microstructure is 5.0 μm or less, and an average Mn concentration at grain boundaries of the prior austenite grains is 1.0 mass % or less. The hot-stamping formed body may be provided with a plating layer on the surface thereof, or may have a softened region in a portion thereof.
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Patent Agency Ranking
公开(公告)号：US20220002830A1
公开(公告)日：2022-01-06
申请号：US17298369
申请日：2020-03-30
Applicant: NIPPON STEEL CORPORATION
Inventor： Shinichiro TABATA , Daisuke MAEDA
IPC: C21D9/46 , B32B15/01 , C21D8/02 , C21D6/00 , C22C38/60 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C28/02 , C23C2/28 , C23C2/12 , C23C2/02
Abstract: This coated steel member includes: a steel sheet substrate having a predetermined chemical composition; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe, in which the coating has a low Al content region having an Al content of 3 mass % or more and less than 30 mass % and a high Al content region formed on a side closer to a surface than the low Al content region and having an Al content of 30 mass % or more, a maximum C content of the high Al content region is 25% or less of a C content of the steel sheet substrate, a maximum C content of the low Al content region is 40% or less of the C content of the steel sheet substrate, and a maximum C content in a range from an interface between the steel sheet substrate and the coating to a depth of 10 μm on a side of the steel sheet substrate is 80% or less of the C content of the steel sheet substrate.
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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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公开(公告)号：US20240183015A1
公开(公告)日：2024-06-06
申请号：US18279370
申请日：2022-05-09
Applicant: NIPPON STEEL CORPORATION
Inventor： Yuri TODA , Daisuke MAEDA , Tamaki SUZUKI , Yuma ASADA , Takuya TAKAYAMA
CPC classification number: C22C38/38 , C21D9/46 , C22C38/02 , C22C38/06 , C21D2211/001 , C21D2211/002 , C21D2211/005
Abstract: This steel sheet for hot stamping has a predetermined chemical composition and has a microstructure in which Sα+SGB, which is a total of an area ratio Sα of ferrite and an area ratio SGB of a granular bainite, is 10% or more and less than 50% and SGB/Sα, which is a ratio between the area ratio SGB of the granular bainite and the area ratio Sα of the ferrite, is 0.30 to 0.70. In addition, a hot-stamping formed body manufactured using this steel sheet for hot stamping has a predetermined chemical composition and a microstructure in which an average grain size of prior austenite grains is 5 to 25 μm, and a standard deviation of grain sizes of the prior austenite grains is 0.1 to 2.0 μm, and a tensile strength of the hot-stamping formed body is 2,200 MPa or more.
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公开(公告)号：US20230040050A1
公开(公告)日：2023-02-09
申请号：US17781239
申请日：2021-01-08
Applicant: NIPPON STEEL CORPORATION
Inventor： Yuri TODA , Kodai MURASAWA , Daisuke MAEDA , Kazuo HIKIDA
IPC: C22C38/60 , C22C38/38 , C22C38/34 , C22C38/30 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/48 , C21D8/02 , C21D6/00 , B21D22/02
Abstract: A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is in a range of 20% to 30%. Among grain boundaries of crystal grains of bainite and tempered martensite in the microstructure, a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and a grain boundary having a rotation angle in a range of 55° to 75° to the direction as a rotation axis is 30% or more.
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公开(公告)号：US20220403492A1
公开(公告)日：2022-12-22
申请号：US17777238
申请日：2021-01-15
Applicant: NIPPON STEEL CORPORATION
Inventor： Daisuke MAEDA , Shingo FUJINAKA , Yuri TODA
IPC: C22C38/58 , C22C38/54 , C22C38/00 , C22C38/06 , C22C38/02 , C22C38/52 , C22C38/50 , C22C38/48 , C22C38/44 , C22C38/46 , B21D22/02 , C21D9/46
Abstract: A hot stamped body with high strength, good bendability and crack propagation resistance, consisting of: in mass %, C: 0.06% or more to less than 0.20%, Si: 0.010-1.00%, Mn: 0.80-2.00%, P: 0.100% or less, S: 0.010% or less, Al: 0.010-0.500%, N: 0.010% or less, Nb: more than 0.020% to 0.10% or less, Ti: 0-0.10%, V: 0-0.10%, Cr: 0-0.50%, Mo: 0-1.00%, B: 0-0.0100%, Ni: 0-0.50%, REM: 0-0.0100%, Mg: 0-0.010%, Ca: 0-0.0100%, and Co: 0-2.0%, with the balance: Fe and impurities, wherein a microstructure includes, in area fraction, ferrite: 5-50%, and martensite: 50-95%, a proportion of regions in the martensite where GAIQ values are 35000 or more to less than 45000 is 30 area % or more, and a maximum bending angle α (deg) is 90 or more.
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