公开(公告)号：US20220074015A1

公开(公告)日：2022-03-10

申请号：US17419557

申请日：2020-01-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Hiroyuki KAWATA ,  Masahiro SAITO ,  Kenichiro OTSUKA ,  Masafumi AZUMA

IPC: C21D9/46 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18 ,  B32B15/01

Abstract: A steel sheet has a predetermined chemical composition, in which a metallographic structure in a surface layer region ranging from a surface to a position of 20 μm from the surface in a sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 1.0% to 15.0%, the metallographic structure in an internal region ranging from a position of more than 20 μm from the surface in the sheet thickness direction to a ¼ thickness position from the surface in the sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 5.0% to 25.0%, the volume fraction of the secondary phase in the surface layer region is less than the volume fraction of the secondary phase in the internal region, and in the surface layer region, the average grain size of the secondary phase is 0.5 μm to 4.0 μm, and a texture in which an XODF{001}/{111} as the ratio of the intensity of {001} orientation to an intensity of {111} orientation in the ferrite is 0.70 to 2.50 is included.

公开(公告)号：US20210205871A1

公开(公告)日：2021-07-08

申请号：US17209473

申请日：2021-03-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Yoshiaki NAKAZAWA ,  Naruhiko NOMURA ,  Toshiya SUZUKI ,  Masahiro KUBO

IPC: B21D22/02 ,  B21D53/88 ,  B21D22/20 ,  B21D22/26 ,  B60J5/04 ,  B21D22/22

Abstract: A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. The opening portion is provided in the top panel portion. The vertical wall portion extends from at least not less than two adjacent borders among the borders of the top panel portion. At least one pair of each vertical wall portion of pairs of adjacent vertical wall portions of the vertical wall portions has a stepped portion. As a result, the panel shaped formed product has fewer defects such as cracks and wrinkles even when it has a shape that is difficult to form.

公开(公告)号：US20200346267A1

公开(公告)日：2020-11-05

申请号：US16642837

申请日：2017-09-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Yoshiyuki KASEDA ,  Yoshiaki NAKAZAWA

IPC: B21D22/02 ,  B62D25/04 ,  B62D29/00

Abstract: The present invention provides a hot-stamping formed article made of steel, in which the hot-stamping formed article has at least one of a tensile strength of 1200 MPa or more and a martensitic steel structure and includes a first portion, a corner portion, and a second portion, which are sequentially continuous from one end portion to the other end portion in a longitudinal direction, each of the first portion, the corner portion, and the second portion includes a top sheet and two vertical walls connected to the top sheet when viewed in a cross section perpendicular to the longitudinal direction, the second portion includes a first outwardly-extending flange adjacent to the vertical wall, and the corner portion includes a vertical flange extending from the vertical wall of the first portion, a second outwardly-extending flange adjacent to the vertical wall located on an outer peripheral side of the corner portion out of the two vertical walls, and a transition portion in which the vertical flange and the second outwardly-extending flange are continuous.

公开(公告)号：US20200094886A1

公开(公告)日：2020-03-26

申请号：US16497296

申请日：2018-04-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA

IPC: B62D29/00 ,  B62D21/15 ,  B62D65/00 ,  B21D22/02

Abstract: A structural member for automobiles to be disclosed includes a press formed product. The press formed product includes two vertical wall sections and a top plate section that joins the two vertical wall sections to each other. At least part of the top plate section is provided with a protruding section that is a steel sheet extending from the top plate section and so folded over against itself as to protrude. The protruding section protrudes from the top plate section toward the interior of the press formed product and extends along the longitudinal direction of the press formed product. With the thus configured structural member, a structural member for automobiles that has a good characteristic in a three-point bending test is provided.

公开(公告)号：US20230100272A1

公开(公告)日：2023-03-30

申请号：US17802475

申请日：2021-02-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Toru YONEBAYASHI ,  Satoshi SHIRAKAMI ,  Yasunori SAWA ,  Masafumi AZUMA ,  Ryuichi NISHIMURA

IPC: B62D25/02 ,  B60J5/04 ,  B62D29/00

Abstract: A stiffened panel structure includes a panel-shaped component and a wire. The panel-shaped component has a panel body that curves in such a manner as to be convex outward. The wire has a first end portion and a second end portion. The first end portion is bonded to a first point on the inner surface of the panel body. The second end portion is bonded to a second point on the inner surface of the panel body. The wire is strained between the first point and the second point.

公开(公告)号：US20220316020A1

公开(公告)日：2022-10-06

申请号：US17420088

申请日：2020-01-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Hiroyuki KAWATA ,  Masahiro SAITO ,  Kenichiro OTSUKA ,  Masafumi AZUMA

IPC: C21D8/02 ,  C22C38/54 ,  C22C38/14 ,  C22C38/12 ,  C22C38/04

Abstract: A steel sheet has a predetermined chemical composition, in which a metallographic structure in a surface layer region ranging from a surface to a position of 20 μm from the surface in a sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 0.01% to 5.0%, a metallographic structure in an internal region ranging from a position of more than 20 μm from the surface in the sheet thickness direction to a ¼thickness position from the surface in the sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 2.0% to 10.0%, the volume fraction of the secondary phase in the surface layer region is less than the volume fraction of the secondary phase in the internal region, and in the surface layer region, an average grain size of the secondary phase is 0.01 μm to 4.0 μm, and a texture in which an XODF{001}/{111} as the ratio of the intensity of {001} orientation to an intensity of {111} orientation in the ferrite is 0.60 or more and less than 2.00 is included.

公开(公告)号：US20220250687A1

公开(公告)日：2022-08-11

申请号：US17625678

申请日：2020-07-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Naoki KIMOTO

IPC: B62D25/04 ,  B62D21/15

Abstract: An objective of the present disclosure is to provide a front pillar outer that is inexpensive, lightweight and strong. In an area in which a first door-side flange part and a second door-side flange part overlap with each other, a first plate part that is connected to a side edge of the first door-side flange part is folded so that a second door-side flange part is sandwiched between the first door-side flange part and the folded first plate part. In an area in which a first glass-face-side flange part and a second glass-face-side flange part overlap with each other, a second plate part that is connected to a side edge of the first glass-face-side flange part is folded so that the second glass-face-side flange part is sandwiched between the first glass-face-side flange part and the folded second plate part.

公开(公告)号：US20220154319A1

公开(公告)日：2022-05-19

申请号：US17441578

申请日：2020-03-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Yoichiro MORI ,  Shinji KODAMA ,  Masahiro MATSUBA

IPC: C22C38/58 ,  B62D27/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/54 ,  C22C38/48 ,  C22C38/50 ,  C22C38/46 ,  B23K35/30

Abstract: An automobile undercarriage part of the present invention has a welded joint formed by base steel plate, wherein the chemical composition of a weld metal contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.30%, Si: 0.10% to less than 1.0%, Mn: 1.2% to 3.0%, Al: 0.002% to 0.30%, Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, the following formula (1A), formula (1B), formula (2), and formula (3) are satisfied, and slag in a toe portion of the fillet weld satisfies a formula (4). [Al]+[Ti]>0.05  Formula (1A) [Ti]/[Al]>0.9  Formula(1B) 7×[Si]+7×[Mn]−112×[Ti]−30×[Al]≤12  Formula (2) 2.0 [Si content on slag surface]  Formula (4).

公开(公告)号：US20220112574A1

公开(公告)日：2022-04-14

申请号：US17429565

申请日：2020-03-19

Applicant: NIPPON STEEL CORPORATION

Inventor： Masafumi AZUMA ,  Eisaku SAKURADA ,  Genki ABUKAWA ,  Kenichiro OTSUKA ,  Takeshi TOYODA

IPC: 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 ,  C23C2/40

Abstract: A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 80% or more of tempered martensite, and a remainder consists of ferrite and bainite, the microstructure contains 5.0×1011 pieces/mm3 or more of, per unit volume, precipitate containing Ti and having an equivalent circle diameter of 5.0 nm or less, 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, and the tensile strength is 1,180 MPa or more.

公开(公告)号：US20210061362A1

公开(公告)日：2021-03-04

申请号：US16961568

申请日：2019-01-11

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA

IPC: B62D25/04 ,  B62D27/02 ,  B62D27/06

Abstract: A front pillar outer includes a first member and a second member. The first member includes a first glass-surface-side flange part and a first door-side flange part. The sheet thickness of the second member is thinner than the sheet thickness of the first member. The second member includes a second glass-surface-side flange part and a second door-side flange part. The first door-side flange part protrudes further towards the rear end of the front pillar outer than the first glass-surface-side flange part and a first main body part, and overlaps with the second door-side flange part. The second glass-surface-side flange part overlaps with a rearward region of the first glass-surface-side flange part. A second main body part overlaps with a rearward region of the first main body part. In a region in which the first member overlaps with the second member, the first member is joined to the second member.