Patents Assigned to Nippon Steel Corporation
  • Publication number: 20210147002
    Abstract: An automotive framework member 1 includes a first steel sheet 10, a second steel sheet 20, and a first weld metal part 40 joining an interface between the first steel sheet 10 and the second steel sheet 20, in which tensile strength of the first steel sheet 10 is 1.0 GPa or more and 1.6 GPa or less, tensile strength of the second steel sheet 20 is 1.8 GPa or more and 2.5 GPa or less, the first steel sheet 10 includes a groove part 18, the second steel sheet 20 is overlapped with the groove part 18, and a minimum Vickers hardness of a region within 4 mm of a periphery of the first weld metal part 40 of the second steel sheet 20 is 80% or more of a hardness of an outside of the region of the second steel sheet 20.
    Type: Application
    Filed: October 30, 2019
    Publication date: May 20, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yasuhiro ITO, Hiroki FUJIMOTO
  • Publication number: 20210147996
    Abstract: A Ni diffusion-plated steel sheet of the present invention includes a base steel sheet and a Fe—Ni diffusion alloy-plating layer positioned on at least one surface of the base steel sheet, a Ni coating weight of the Fe—Ni diffusion alloy-plating layer is 9.0 to 35 g/m2, a Fe concentration Cs of an outermost layer of the Fe—Ni diffusion alloy-plating layer is 10 to 55 mass %, the base steel sheet has a predetermined chemical composition, and a ferrite grain size number specified by JIS G 0551 (2013) of the base steel sheet is 10.0 or more.
    Type: Application
    Filed: April 12, 2019
    Publication date: May 20, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takehiro TAKAHASHI, Kiyokazu ISHIZUKA, Yasuto GOTO
  • Patent number: 11007839
    Abstract: An automotive component manufacturing method includes a molding process of pressing a portion of a hollow tube formed from a metal material, or a composite material including a metal and a resin, so as to deform the portion of the hollow tube, from a tube outer side toward a tube inner side, to beyond an axial center of the hollow tube, and mold the portion of the hollow tube into a deformed section deformed with a concave profile; and a deformation process of deforming a location having a high level of residual stress in a closed cross-section configured by the deformed section so as to deform the location out-of-plane.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: May 18, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Manabu Wada, Yasushi Suzuki, Noboru Hasegawa
  • Patent number: 11007598
    Abstract: The present invention provides a spot welding method for a member to be welded constituted of a plurality of steel sheets that are overlapped with each other at at least a welding zone, in which at least an overlapped face of at least one of the plurality of steel sheets at the welding zone is coated with zinc plating, a total sheet thickness t (mm) of the plurality of steel sheets is 1.35 mm or more, a squeeze time St (seconds) from the time when welding electrodes are brought into contact with the member to be welded to the time when electric current flow for welding starts satisfies “0.020?St”, and a hold time Ht( seconds) after welding from the time when electric current flow for welding between the welding electrodes ends to the time when the welding electrodes and the member to be welded are brought out of contact satisfies “0.015t2+0.020?Ht”.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: May 18, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Chisato Yoshinaga, Yasunobu Miyazaki, Kunio Hayashi, Hiroyuki Kawata, Masanori Yasuyama
  • Publication number: 20210140024
    Abstract: In an H-section steel, which has a predetermined chemical composition, a thickness of the flange is from 25 to 140 mm; an average crystal grain diameter is 38 ?m or less and the area fraction of a martensite-austenite constituent is 1.2% or less, in a plane orthogonal to the width direction of the flange, centering on a measurement position 7 that is a position separated, in the width direction of the flange, from the end face in the width direction of the flange by (?)F, and separated, in the thickness direction of the flange, from the outer face in the thickness direction of the flange by (¼)t2, when the width direction length of the flange is F and the thickness of the flange is t2; a yield strength or 0.
    Type: Application
    Filed: March 15, 2018
    Publication date: May 13, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masaki MIZOGUCHI, Kazutoshi ICHIKAWA, Motomichi HARA, Shunsuke YAMAGISHI
  • Publication number: 20210138534
    Abstract: This electromagnetic stirring device configured to apply an electromagnetic force which generates a swirling flow around a vertical axis to molten metal in a mold by generating a rotating magnetic field in the mold, which is a quadrangular tubular mold for continuous casting, the electromagnetic stirring device provided with an iron core enclosing the mold at a side of the mold and including two teeth arranged side by side in a circumferential direction of the mold so as to face an outer side surface for each of outer side surfaces of the mold, coils wound around the respective teeth of the iron core, and a power supply device which applies an alternating current to each of the coils with a phase shift by 90° in arrangement order of the coils so as to generate the rotating magnetic field.
    Type: Application
    Filed: April 24, 2019
    Publication date: May 13, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Nobuhiro OKADA
  • Publication number: 20210140005
    Abstract: A hot-rolled steel sheet according to an aspect of the present invention has a predetermined chemical composition, in which, in a location at a depth of ¼ of a sheet thickness from a surface, an area ratio of ferrite is 10% to 55%, a total area ratio of bainite and martensite is 45% to 90%, a total area ratio of the ferrite, the bainite, and the martensite is 90% or more, an average crystal grain size is 12.0 ?m or less, in a texture measured in a sheet thickness central portion, a maximum pole density of orientation groups of {100} <011>, {211} <011>, {311} <011>, {110} <011>, and {332} <113>is 8.0 or less, a total of pole densities of {211} <011>and {332} <113> is 10.0 or less, and a tensile strength is 950 MPa or more.
    Type: Application
    Filed: July 6, 2018
    Publication date: May 13, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Mitsuru YOSHIDA, Nobusato KOJIMA, Yuuki KANZAWA, Kohhei KAMIYA
  • Patent number: 11000890
    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.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: May 11, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenichiro Otsuka, Yoshiaki Nakazawa, Naruhiko Nomura, Toshiya Suzuki, Masahiro Kubo
  • Patent number: 11002647
    Abstract: A stress test the jig 10 includes an upper cylinder 12, a lower cylinder 14, and a frame 16. The frame 16 has an accommodating space 16a, an upper through hole 16b, and a lower through hole 16c. A test specimen 20 is disposed in the accommodating space 16a, the upper cylinder 12 is inserted into the upper through hole 16b, and the lower cylinder 14 is inserted into the lower through hole 16c. The upper cylinder 12 and the lower cylinder 14 fix the test specimen 20 such that the test specimen 20, the upper cylinder 12, and the lower cylinder 14 are positioned coaxially.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: May 11, 2021
    Assignee: Nippon Steel Corporation
    Inventors: Koichi Kuroda, Daisaku Yanaga, Yuhei Suzuki
  • Patent number: 10994591
    Abstract: Provided is a configuration that makes up for a lack of tensile rigidity and a lack of collision properties at the same time. [Solution] An automotive exterior panel according to the present invention: an exterior material 110; and a reinforcing member 120 that is in contact along an automobile inside surface of the exterior material 110 and of which a second moment of area in a direction orthogonal to the exterior material is less than or equal to 15,000 mm4 in a cross section orthogonal to a longitudinal direction of the 10 reinforcing member. By this configuration, the second moment of area in a direction orthogonal to the longitudinal direction of the reinforcing member 120 is made less than or equal to 15,000 mm4, and hence a lack of tensile rigidity can be made up for at the same time.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Toshiya Suzuki, Yoshiaki Nakazawa, Yasuhiro Ito, Satoshi Shirakami
  • Patent number: 10995393
    Abstract: When a Si content (mass %) is set to [Si], an Al content (mass %) is set to [Al], and a Mn content (mass %) is set to [Mn], a parameter Q represented by “Q=[Si]+2[Al]?[Mn]” is 2.00 or more, the total mass of S contained in sulfides or oxysulfides of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, or Cd is 40% or more of the total mass of S contained in a non-oriented electrical steel sheet, a {100} crystal orientation intensity is 3.0 or more, a thickness is 0.15 mm to 0.30 mm, and an average crystal grain diameter is 65 ?m to 100 ?m.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takeshi Kubota, Takashi Morohoshi, Masafumi Miyazaki
  • Patent number: 10994681
    Abstract: A bumper beam for a vehicle that is lightweight and high in strength is provided. A bumper beam for a vehicle includes a first member and a second member. The first member includes a first top panel part, two first vertical wall parts, and two first flange parts. The second member includes a second top panel part, two second vertical wall parts, and two second flange parts. The second top panel part includes a protruding part that protrudes toward a side opposite to the first top panel part. The two second vertical wall parts are disposed such that the second vertical wall parts respectively face close the first vertical wall parts inside the first member. The two second flange parts are disposed such that the second flange parts are connected to the two second vertical wall parts and joined to the first flange parts, respectively.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Atsuo Koga, Yoshiaki Nakazawa
  • Patent number: 10995394
    Abstract: A steel bar for a downhole member is provided that is excellent in SCC resistance and SSC resistance. A martensitic stainless steel bar material for a downhole member of the present embodiment has a chemical composition that contains, by mass %, C: 0.020% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.03% or less, S: 0.01% or less, Cu: 0.10 to 2.50%, Cr: 10 to 14%, Ni: 1.5 to 7.0%, Mo: 0.2 to 3.0%, Ti: 0.05 to 0.3%, V: 0.01 to 0.10%, Nb: 0.1% or less, Al: 0.001 to 0.1% and N: 0.05% or less, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2). [Mo]?4×[total Mo amount in precipitate at R/2 position]?1.30??(1) [Total Mo amount in precipitate at center position]?[total Mo amount in precipitate at R/2 position]?0.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Daisuke Matsuo, Takuji Nakahata, Hisashi Amaya, Tsutomu Okuyama, Hideki Takabe
  • Patent number: 10994364
    Abstract: A spot welded joint in which a high CTS is obtained even if including one or more high strength steel sheets and a method of welding of the same, that is, a spot welded joint 1 including a plurality of steel sheets, wherein one or more steel sheets is a tensile strength 750 to 2500 MPa high strength steel sheet and, at a cross-section in the sheet thickness direction of the steel sheets, when defining superposed surfaces of a high strength steel sheet S1 arranged at an outermost side and another steel sheet 1B as the “plane A” and defining a plane passing through a point of one-half of a distance between a nugget end position E of a high strength steel sheet S1 side on the line L1 in the sheet thickness direction and a crossing point O of the plane A and the line L1 and parallel to the plane A as the “plane B”, at a square area SA of sides of 30 ?m centered about a crossing point X of a line L2, which is separated by 250 ?m to the heat affected zone side from a tangent at any position on a nugget end line NEL
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Chisato Yoshinaga, Seiji Furusako, Fuminori Watanabe, Yasunobu Miyazaki, Tohru Okada
  • Patent number: 10995396
    Abstract: A rail according to an aspect of the present invention is manufactured by melting steel using an electric furnace, satisfies a predetermined range as a chemical composition and particularly includes Pb: 0.0003% to 0.0020%, 95 area % or more of a region from an outer surface of a head portion to a depth of 20 mm is a pearlite structure, and a hardness in the region from the outer surface of the head portion to the depth of 20 mm is in a range of Hv 300 to Hv 500.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: May 4, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaharu Ueda, Teruhisa Miyazaki
  • Publication number: 20210123115
    Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 ?m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm?1 and a peak intensity IB at 1200 cm?1 satisfy IB/IA?0.010.
    Type: Application
    Filed: July 13, 2018
    Publication date: April 29, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi KATAOKA, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Shunsuke OKUMURA
  • Publication number: 20210126152
    Abstract: A light wavelength conversion member in which silicon nanoparticles are dispersed having a higher photoluminescence intensity, a method of production of the same, a photovoltaic module, and a photovoltaic cell, in particular, a light wavelength conversion member comprised of a substrate on one surface of which is formed a silicon oxide film in which silicon nanoparticles of a size of 1 nm to 10 nm are dispersed, the silicon oxide film, when the silicon oxide film is measured by the electron spin resonance method, having a spin density in the range of g=1.998±0.001 of 1×1016/cm3 or less and a spin density in the range of g=2.003±0.001 of 3×1016/cm3 or less and having a photoluminescence quantum yield with respect to incident light of a wavelength of 300 nm to 500 nm of 15% or more.
    Type: Application
    Filed: April 25, 2018
    Publication date: April 29, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Shinji TOKUMARU
  • Publication number: 20210122216
    Abstract: The present invention provides a shock-absorbing member including: an exterior material 110 for an automobile; a first reinforcing member 122 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the S direction along the exterior material 110; a second reinforcing member 124 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the direction along the exterior material 110; an intersecting part where the first reinforcing member 122 and the second reinforcing member intersect and overlap; and a joint that joins the first reinforcing member 122 and the second reinforcing member 124 at the intersection.
    Type: Application
    Filed: January 28, 2019
    Publication date: April 29, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Toshiya SUZUKI, Yoshiaki NAKAZAWA, Tasuku ZENIYA, Tohru YOSHIDA
  • Publication number: 20210123122
    Abstract: This steel sheet has a predetermined chemical composition, in which a steel structure of an inside of the steel sheet contains, by volume fraction, soft ferrite: 0% to 30%, retained austenite: 3% to 40%, fresh martensite: 0% to 30%, a sum of pearlite and cementite: 0% to 10%, and a remainder includes hard ferrite, in the inside of the steel sheet, a number proportion of the retained austenite having an aspect ratio of 2.0 or more in the total retained austenite is 50% or more, a soft layer having a thickness of 1 to 100 ?m from a surface in a sheet thickness direction is present, in ferrite contained in the soft layer, a volume fraction of grains having an aspect ratio of less than 3.0 is 50% or more, the volume fraction of retained austenite in the soft layer is less than 50% of the volume fraction of the retained austenite of the inside of the steel sheet, and a peak of an emission intensity at a wavelength indicating Si appears in a range of more than 0.2 ?m and 5.0 ?m or less from the surface.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 29, 2021
    Applicant: Nippon Steel Corporation
    Inventors: Takafumi YOKOYAMA, Kohichi SANO, Riki OKAMOTO, Hiroyuki KAWATA, Eisaku SAKURADA, Yuji YAMAGUCHI, Kazuki SHIOKAWA, Yuichi NAKAHIRA, Kohei UEDA, Masahiro NAKATA, Satoshi UCHIDA
  • Patent number: 10991494
    Abstract: When a Si content (mass %) is set to [Si], an Al content (mass %) is set to [Al], and a Mn content (mass %) is set to [Mn], a parameter Q represented by “Q=[Si]+2[Al]?[Mn]” is 2.00 or more, the total mass of S contained in sulfides or oxysulfides of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, or Cd is 40% or more of the total mass of S contained in a non-oriented electrical steel sheet, a {100} crystal orientation intensity is 3.0 or more, a thickness is 0.15 mm to 0.30 mm, and an average crystal grain diameter is 65 ?m to 100 ?m.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: April 27, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takeshi Kubota, Takashi Morohoshi, Masafumi Miyazaki