Patents Assigned to Nippon Steel Corporation
  • Publication number: 20240084833
    Abstract: The present disclosure inhibits liquid metal embrittlement (LME) cracking and improves corrosion resistance in a welded joint obtained by spot welding a first steel sheet and a second steel sheet. In the welded joint of the present disclosure, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond of the spot welded part toward an outside of the spot welded part, and a Zn penetrated part is present at least at one of the first steel sheet and the second steel sheet adjoining the boundary plating layer.
    Type: Application
    Filed: December 24, 2021
    Publication date: March 14, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takuya MITSUNOBU, Hiroshi TAKEBAYASHI, Takehiro TAKAHASHI
  • Publication number: 20240084422
    Abstract: The hot-dip plated steel material includes a steel material and a hot-dip plated layer disposed on a surface of the steel material, the hot-dip plated layer has a certain chemical composition, and the hot-dip plated layer has a diffraction intensity obtained from a result of X-ray diffraction measurement, the diffraction intensity satisfying a certain relationship.
    Type: Application
    Filed: March 23, 2023
    Publication date: March 14, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takuya MITSUNOBU, Kohei TOKUDA, Hiroshi TAKEBAYASHI
  • Publication number: 20240084415
    Abstract: This non-oriented electrical steel sheet includes a base material having a chemical composition including Si: 3.7 to 4.8%, wherein a recrystallization rate is less than 100% in terms of an area fraction, the following Formula (i) and Formula (ii) are satisfied, and the tensile strength is more than 700 MPa. 4.3?Si+sol. Al+0.5×Mn?4.9??(i) (B50(0°)+2×B50(45°)+B50(90°))/4?1.
    Type: Application
    Filed: March 31, 2022
    Publication date: March 14, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Ichiro TANAKA, Yoshihiro ARITA, Hiroki HORI, Wataru OHASHI
  • Publication number: 20240084427
    Abstract: A steel sheet has a predetermined chemical composition, when a sheet thickness is denoted by t, a metallographic structure at a t/4-position, which is a position t/4 away from a surface, in a cross section in a sheet thickness direction includes, by volume percentage, martensite: 70% or greater and residual austenite: 10% or greater, the maximum grain diameter of the residual austenite is less than 5.0 ?m when a Mn concentration is measured at a plurality of measurement points at intervals of 1 ?m in a square region with a side length of t/4 centered at the t/4-position in the cross section in the sheet thickness direction, a proportion of measurement points at which the Mn concentration is 1.1 times or greater than the average of the Mn concentrations at all of the plurality of measurement points is less than 10.0%, and the tensile strength is 1,470 MPa or greater.
    Type: Application
    Filed: February 18, 2022
    Publication date: March 14, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Yuya SUZUKI
  • Publication number: 20240082900
    Abstract: Provided is a welding monitoring apparatus that monitors a welding state of a V-convergence region in which a strip-shaped metal sheet is converged in a V-shape, when the metal sheet is cylindrically formed while being conveyed, and both side edges of the metal sheet are heated and melted in a manner of being butted each other while being converged in the V-shape, such that an electric resistance welded steel pipe is manufactured. This welding monitoring apparatus includes an image capturing unit that captures images of a region including the V-convergence region in time series; and an image processing unit that extracts a welding point based on the images captured in time series and detects the presence or absence and a position of irregular arcing at the welding point or on an upstream side of the welding point.
    Type: Application
    Filed: August 25, 2023
    Publication date: March 14, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Noboru HASEGAWA, Michitoshi TANIMOTO, Michimasa MUKAI
  • Patent number: 11926120
    Abstract: This steel sheet for hot stamping includes a base material, an Al—Si alloy plating layer in which the Al content is 75 mass % or more, the Si content is 3 mass % or more and the total of the Al content and the Si content is 95 mass % or more and a Ni plating layer in which the Ni content is more than 90 mass % in this order, the chemical composition of the base material is, by mass %, C: 0.01% or more and less than 0.70%, Si: 0.005% to 1.000%, Mn: 0.40% to 3.00%, Nb: 0.010% to 0.200%, a solid solution of Nb: 0.010% to 0.150%, sol. Al: 0.00020% to 0.50000%, P: 0.100% or less, S: 0.1000% or less, N: 0.0100% or less, Cu: 0% to 1.00%, Ni: 0% to 1.00%, V: 0% to 1.00%, Ti: 0% to 0.150%, Mo: 0% to 1.000%, Cr: 0% to 1.000%, B: 0% to 0.0100%, Ca: 0% to 0.010%, REM: 0% to 0.300%, and a remainder: Fe and an impurity, the Al—Si alloy plating layer has a thickness of 7 to 148 ?m, and the Ni plating layer has a thickness of more than 200 nm and 2500 nm or less.
    Type: Grant
    Filed: May 13, 2021
    Date of Patent: March 12, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takayuki Harano, Yuji Sakiyama, Akinobu Kobayashi
  • Patent number: 11925968
    Abstract: A method for manufacturing a press-formed article (100) includes a first step for forming a base sheet portion, a first rising portion, and a first strip portion from a sheet-shaped workpiece having a first edge portion and a second edge portion; and a second step for forming a second rising portion by causing a strip-shaped first zone including the second edge portion to be disposed between a first upper die and a first lower die from both sides, causing a second zone adjacent to the first zone to be disposed between a second upper die and a second lower die from both sides, and moving the first upper die and the first lower die relative to the second upper die and the second lower die, wherein, in the second step, a part of the second rising portion which is connected to a vertical ridge line (108) is shear-deformed.
    Type: Grant
    Filed: September 23, 2020
    Date of Patent: March 12, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Ryo Kuroda, Yasuharu Tanaka, Takashi Miyagi, Misao Ogawa
  • Patent number: 11923130
    Abstract: A laminated core includes: a plurality of electrical steel sheets stacked in a thickness direction, wherein the electrical steel sheet includes an annular core back part and a plurality of tooth parts protruding from the core back part toward a radial direction and arranged at intervals in a circumferential direction of the core back part, and wherein among the plurality of electrical steel sheets, the tooth parts of the electrical steel sheets located at one side on the outside in a stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, the tooth parts of the electrical steel sheets located at the other side on the outside in the stacking direction are adhered to each other by an adhesion part provided between the tooth parts adjacent to each other in the stacking direction, and the tooth parts of the electrical steel sheets located at a center part in the stacking direction are not adhered to each other.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: March 5, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masahito Kamikawabata, Ryu Hirayama, Kazutoshi Takeda
  • Patent number: 11920703
    Abstract: A threaded connection for pipes according to the present embodiment includes a pin, a box, and a Zn—Ni alloy plating layer. The pin has a pin contact surface that includes an external thread part. The box has a box contact surface that includes an internal thread part. The Zn—Ni alloy plating layer is disposed on or above at least one of the pin contact surface and the box contact surface. The Zn—Ni alloy plating layer contains graphite.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: March 5, 2024
    Assignees: NIPPON STEEL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Kazuya Ishii, Kunio Goto
  • Publication number: 20240068066
    Abstract: 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.
    Type: Application
    Filed: February 22, 2022
    Publication date: February 29, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yasuaki TANAKA, Shohei YABU, Hiroshi SHUTO, Koutarou HAYASHI, Takashi YASUTOMI, Eisaku SAKURADA
  • Patent number: 11916243
    Abstract: A cell case of a secondary battery having a rectangular tube-shaped can body, a can bottom double seamed to a bottom end of the can body, and a can lid double seamed to a top end of the can body, in which cell case of a secondary battery, an area ratio S1 of part of the can bottom, including a portion 1 between a plane vertical to the can body a distance of 0.5 mm above a bottom end of a double seam of the can body and the can bottom and a plane vertical to the can body a distance of 1.0 mm below the bottom end of the double seam, with respect to a cross-sectional area of the can body at the bottom end of the double seam is 50% or more, and a battery module having a plurality of such cell cases are provided.
    Type: Grant
    Filed: September 7, 2021
    Date of Patent: February 27, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takehiro Takahashi, Akinobu Kobayashi
  • Patent number: 11915860
    Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other and coated with an insulation coating on both surfaces thereof, and an adhesion part provided between the electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein an adhesion area ratio of the electrical steel sheet by the adhesion part is 1% or more and 40% or less.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: February 27, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Ryu Hirayama, Kazutoshi Takeda
  • Patent number: 11912341
    Abstract: In an automobile hood, sufficient panel rigidity and dent resistance are secured while achieving weight reduction. Automobile hood 1 has a panel 2, a reinforcing member 3, and a joint 4 that joins the panel 2 and the reinforcing member 3. The reinforcing member 3 includes a structure formed from a plurality of units 7 having a hexagonal annular shape disposed in a close-packed arrangement. Unit 7 has a floor 11, inclined wall 12 and top plate 13. The floor 11 is adjacent to the panel 2. Top plate 13 and panel 2 are separated from each other. The inclined wall 12 is arranged between the floor 11 and the top plate 13. A hexagonal annular first ridge line 31 of the unit 7 is located between the inclined wall 12 and the floor 11. A length L1 of one side of the first ridge line 31 is 40-75 mm.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: February 27, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tohru Yoshida, Koichi Hamada, Takeshi Kawachi, Atsuo Koga, Takuya Oishi
  • Publication number: 20240059237
    Abstract: A structural member includes a first member, a second member, and a restricting portion. The first member includes a top plate, vertical walls, flanges, and ridge portions. The second member includes a top plate, vertical walls, flanges, and ridge portions. The vertical walls of the second member are disposed along the vertical walls of the first member inside of the vertical walls. The flanges of the second member are joined to the flanges of the first member, respectively. The restricting portion is provided between the vertical walls of the second member. The restricting portion restricts deformation in which portions of the vertical walls of the first member close to the flanges approach each other.
    Type: Application
    Filed: December 24, 2021
    Publication date: February 22, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Atsushi ONO
  • Publication number: 20240059238
    Abstract: A structural member includes a first member, a second member, and resin. The first member includes a top plate, vertical walls, flanges, and ridge portions. The second member includes a top plate, vertical walls, flanges, and ridge portions. The vertical walls of the second member are disposed along the vertical walls of the first member on an inner side of the vertical walls. The flanges of the second member are joined to the flanges of the first member, respectively. The resin is filled in between the vertical walls of the second member.
    Type: Application
    Filed: December 24, 2021
    Publication date: February 22, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Atsushi ONO
  • Publication number: 20240058888
    Abstract: The present disclosure inhibits liquid metal embrittlement (LME) cracking in a welded joint obtained by spot welding a first steel sheet and a second steel sheet. In the welded joint of the present disclosure, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, and a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond toward an outside of the spot welded part. A higher tensile strength of a tensile strength of the first steel sheet and a tensile strength of the second steel sheet is 780 MPa or more, an area ratio of a ?-Zn phase at the cross-section of the boundary plating layer is 5% or more, and the first plating layer and the second plating layer satisfy predetermined Relations I and II.
    Type: Application
    Filed: December 24, 2021
    Publication date: February 22, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takuya MITSUNOBU, Hiroshi TAKEBAYASHI, Takehiro TAKAHASHI
  • Publication number: 20240058887
    Abstract: Provided is a frame member obtained by joining a first steel sheet member and a second steel sheet member at a spot-welding portion by spot welding. A cross-sectional region in which a cross section perpendicular to a longitudinal direction of the frame member is a closed cross section is formed, the first steel sheet member has a tensile strength of 1,900 MPa or more, and the spot-welding portion has a molten metal portion formed by the spot welding and a heat-affected portion adjacent to an outside of the molten metal portion. Average Vickers hardness HvAve at a measurement position corresponding to the first region on the virtual straight line and minimum Vickers hardness HvMin at a measurement position corresponding to the third region on the virtual straight line satisfy HvAve?HvMin?100.
    Type: Application
    Filed: April 14, 2022
    Publication date: February 22, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Ryoma KATO, Takahiro AITOH, Shingo FUJINAKA, Yuri TODA
  • Patent number: 11904948
    Abstract: This bonded structure includes a first member having a metal portion and a film portion disposed on at least a part of a surface of the metal portion; a second member; an adhesive layer for joining the first member and the second member to each other via the film portion. The film portion contains a resin and inorganic particles. The inorganic particles are formed of ferrosilicon or non-oxide ceramics containing V. Some of the inorganic particles protrude toward the adhesive layer. The particle size of at least some of the inorganic particles protruding toward the adhesive layer is less than the film thickness of the film portion.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: February 20, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Atsuo Koga, Masumi Koori, Kohei Ueda
  • Patent number: 11904573
    Abstract: A hot-stamped article according to the present invention has a plating layer being attached to a single surface in an amount of 10 g/m2 or more and 90 g/m2 or less and having a Ni content of 10 mass % or more and 25 mass % or less with a remainder including Zn and impurities on a surface of a base steel sheet having a predetermined chemical composition, in a surface layer region, a metallographic structure includes 80.0% or more of martensite and 8.0% or more of residual austenite in terms of area percentage, and the concentration of Ni in the surface layer region is 8 mass % or more.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: February 20, 2024
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yuji Sakiyama, Yuri Toda, Kazuo Hikida
  • Patent number: 11905766
    Abstract: A threaded tubular connection includes a box member having a female external thread, a female internal thread, and a female intermediate sealing surface between the female external thread and the female internal thread, and a pin member having a corresponding male external thread, a male internal thread, and a male intermediate sealing surface, such that male threads interlock by thread engagement with female threads, and intermediate sealing surfaces form an intermediate metal-to-metal seal when the threaded tubular connection is made up. The box member includes a minimal outer diameter at the intermediate metal-to-metal seal location, the minimal outer diameter being smaller than respectively an external and an internal outer diameter respectively being located above the female external thread and the female internal thread.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: February 20, 2024
    Assignees: VALLOUREC OIL AND GAS FRANCE, NIPPON STEEL CORPORATION
    Inventors: Anthony Foulogne, Pierre Martin