公开(公告)号：US20220228245A1

公开(公告)日：2022-07-21

申请号：US17614623

申请日：2020-05-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Takehiro TAKAHASHI ,  Daisuke MAEDA ,  Hiroshi TAKEBAYASHI

IPC: C22C38/32 ,  B32B15/01 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C18/00 ,  C25D3/22

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 more, and a difference between a diffraction peak of the Zn—Ni plating layer after heat treating the plated steel sheet for hot stamping at 200° C. for 1 hour, and a diffraction peak of the Zn—Ni plating layer before heat treating it, is 0.3° or less.

公开(公告)号：US20220135143A1

公开(公告)日：2022-05-05

申请号：US17431291

申请日：2020-03-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiko ABE ,  Hiroaki KUBOTA ,  Daisuke MAEDA ,  Yuri TODA

IPC: B62D29/00 ,  B21D22/20 ,  B21D53/88 ,  C21D9/00

Abstract: This vehicle body structure includes a frame member with a first top section, a corner section, a vertical wall section, and a second top section, and a first support section and a second support section provided at the second top section. L/h≤6.7 is satisfied where the h represents a length between an outer surface of the first top section and an outer surface of the second top section, and the L represents a length between the first support section and the second support section.

公开(公告)号：US20210070368A1

公开(公告)日：2021-03-11

申请号：US16965922

申请日：2019-10-09

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuri TODA ,  Hiroaki KUBOTA ,  Hiroyuki KAWATA ,  Daisuke MAEDA

IPC: B62D21/15

Abstract: In a frame member, the hardness of a sheet-thickness-direction central section in a portion where a softening layer is provided is greater than or equal to 400 Hv, the softening layer has hardness smaller by at least 10 Hv than the hardness of the sheet-thickness-direction central section in the portion where the softening layer is provided, the thickness of the softening layer is greater than or equal to 2% of the sheet thickness but smaller than 20% of the sheet thickness, the hardness of the softening layer at the surface is greater than or equal to 0.5 times the hardness of the sheet-thickness-direction central section but smaller than 0.9 times the hardness of the sheet-thickness-direction central section, the softening layer has a first hardness changing area and a second hardness changing area, an absolute value ΔHv1 of a change in hardness of the first hardness changing area in the sheet thickness direction is greater than an absolute value ΔHv2 of a change in hardness of the second hardness changing area in the sheet thickness direction, and R/t≤2.5 is satisfied, where R represents the bending radius of the corner section, and t represents the sheet thickness of the corner section.

公开(公告)号：US20200016866A1

公开(公告)日：2020-01-16

申请号：US16486995

申请日：2018-02-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuri TODA ,  Genki ABUKAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA

IPC: B32B15/01 ,  B21D22/02 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

Abstract: 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 500 Hv or more and 800 Hv or less, the surface layer has a hardness change ΔH1 in the sheet thickness direction of 100 Hv or more and less than 200 Hv, and the intermediate layer has a hardness change ΔH2 in the sheet thickness direction of 10 Hv or more and less than 50 Hv.

公开(公告)号：US20200001342A1

公开(公告)日：2020-01-02

申请号：US16484415

申请日：2018-02-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuri TODA ,  Genki ABUKAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA ,  Shingo FUJINAKA

IPC: B21D22/02 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01

Abstract: 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 500 Hv or more and 800 Hv or less, the surface layer has a hardness change ΔH1 in the sheet thickness direction of 10 Hv or more and less than 200 Hv, and the intermediate layer has a hardness change ΔH2 in the sheet thickness direction of 50 Hv or more and less than 200 Hv.