Patents Assigned to Nippon Steel Corporation
  • Publication number: 20210156017
    Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.
    Type: Application
    Filed: April 26, 2019
    Publication date: May 27, 2021
    Applicant: Nippon Steel Corporation
    Inventors: Masahiro FUDA, Toshinori MIZUGUCHI, Junji NAKANO, Yoshiharu INOUE, Kazuhisa KUSUMI, Yasuaki NAITO
  • Publication number: 20210155999
    Abstract: A zinc-plated steel sheet of an aspect of the present invention includes a steel sheet having a predetermined chemical composition and a zinc-plated layer. In the steel sheet, steel microstructures in a range of ? thickness to ? thickness, having the center at ¼ thickness from a steel sheet surface, include, by vol %, ferrite: 0% to 10%, bainite: 0% to 30%, tempered martensite: 50% or more, fresh martensite: 0% to 10%, retained austenite: more than 10% and 30% or less, and pearlite: 0% to 5%. In the zinc-plated steel sheet, the amount of hydrogen emitted when the steel sheet is heated to 200° C. from room temperature after removal of the zinc-plated layer is 0.40 ppm or less per mass of the steel sheet, the tensile strength is 1470 MPa or more, and no cracking occurs in a U-shape bending test where a stress equivalent to 1000 MPa is applied for 24 hours.
    Type: Application
    Filed: April 26, 2019
    Publication date: May 27, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takafumi YOKOYAMA, Kunio HAYASHI, Masahiro NAKATA, Yuji YAMAGUCHI, Satoshi UCHIDA
  • Publication number: 20210155294
    Abstract: An automobile structural member has a first wall part, a second wall part that faces the first wall part, and a third wall part that connects the first wall part and the second wall part. At least one of the first wall part and the second wall part has a main wall part in which two through-holes are formed, and at least two auxiliary wall parts that are provided so as to rise from the main wall part. Each auxiliary wall part is provided so as to rise in the thickness direction of the main wall part from an edge of a through-hole. The distance between two auxiliary wall parts in the longitudinal direction of the main wall part is 1.4 times or less the width of the main wall part at a portion between the two auxiliary wall parts.
    Type: Application
    Filed: July 11, 2019
    Publication date: May 27, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Yasuhiro ITO
  • Publication number: 20210156681
    Abstract: [Object] To inspect the inner surface of a tubular body at higher speed, with higher resolving power, and in a simpler way regardless of the size of the tubular body. [Solution] A tubular body inner surface inspection method for detecting a defect existing on an inner surface of a tubular body includes: a tubular body imaging apparatus including an optical element that reflects laser light applied from a laser light source in a circumferential direction of the inner surface of the tubular body, as annular laser light, an area camera that images a region of the inner surface of the tubular body where the annular laser light is applied, and generates an annular beam image, and a linking member that links together and fixes the laser light source and the area camera; and an arithmetic processing apparatus performing image processing on a plurality of the generated annular beam images.
    Type: Application
    Filed: May 31, 2018
    Publication date: May 27, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Toshio AKAGI, Hironao YAMAJI, Takeo NAKATA, Masaki YAMANO
  • Publication number: 20210154978
    Abstract: A metal-carbon fiber reinforced plastic composite comprising a metal member of a ferrous material or ferrous alloy, a resin layer provided on at least one surface of the metal member and including a thermosetting resin, and carbon fiber reinforced plastic provided on a surface of the resin layer and including a carbon fiber material and a matrix resin having thermoplasticity, an indentation elastic modulus at 160 to 180° C. of the resin layer being higher than an indentation elastic modulus at 160 to 180° C. of the matrix resin.
    Type: Application
    Filed: April 2, 2019
    Publication date: May 27, 2021
    Applicant: Nippon Steel Corporation
    Inventors: Masumi KOORI, Yasuaki KAWAMURA, Kohei UEDA
  • Patent number: 11014139
    Abstract: A process of pressing a blank to form an intermediate formed component configured including a top plate, the ridge lines at short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, such that a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate. The method includes pressing the intermediate formed component to narrow a projection width of the step, or to move a portion of the curved wall where the vertical walls face each other.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: May 25, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masahiro Kubo, Hiroshi Yoshida, Takashi Miyagi, Toshiya Suzuki, Yoshiaki Nakazawa
  • Patent number: 11015746
    Abstract: A threaded connection that provides high sealing performance is provided. A threaded connection (10) includes a pin (1) and a box (2). An inner male thread (13) of the pin (1) includes a parallel portion (131). The parallel portion (131) is located at an end portion of the inner male thread (13) adjacent to the pin inner sealing surface (11), and has thread roots parallel to the pipe axis. An inner female thread (23) of the box (2) includes a tapered portion (231). The thread height in the tapered portion (231) is larger than that in the parallel portion (131). Da<Db is satisfied, where Da is the difference in diameter between adjacent thread crests (231a) in the tapered portion (231) in a longitudinal cross section of the pin (1) and box (2) as found when the connection is not made up, and Db is the difference between the diameter of the thread root (131a) in the parallel portion (13) and the maximum diameter of the pin inner sealing surface (11).
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: May 25, 2021
    Assignees: Nippon Steel Corporation, Vallourec Oil and Gas France
    Inventors: Satoshi Maruta, Yousuke Oku
  • Patent number: 11016011
    Abstract: In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: May 25, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Jun Nitta, Shigeru Yonemura, Satoshi Shirakami, Takashi Yasutomi
  • Patent number: 11017054
    Abstract: A collapse strength prediction method of a steel pipe includes deriving a prediction equation indicating a relationship among D/t obtained by dividing an outer diameter D (mm) by a thickness t (mm), material characteristics, a collapse strength dominant factor, and a collapse dominant proof stress (?CDOS) of the steel pipe using a plurality of reference steel pipes collapse whose strengths have been obtained in advance, obtaining D/t, material characteristics, a collapse strength dominant factor, and a predicted collapse strength of a steel pipe that is an evaluation subject, obtaining a compressive stress-strain curve in a circumferential direction of the steel pipe that is the evaluation subject, obtaining a stress that causes a permanent strain to be generated in the steel pipe that is the evaluation subject as the collapse dominant proof stress on the basis of the compressive stress-strain curve, and computing the predicted collapse strength of the steel pipe that is the evaluation subject from the D/t, t
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: May 25, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yukinobu Nagata, Yuusuke Ichinose
  • Patent number: 11015233
    Abstract: A titanium alloy part is characterized in that it includes, by mass %: Al: 1.0 to 8.0%; Fe: 0.10 to 0.40%; O: 0.00 to 0.30%; C: 0.00 to 0.10%; Sn: 0.00 to 0.20%; Si: 0.00 to 0.15%; and the balance: Ti and impurities, in which: an average grain diameter of ?-phase crystal grains is 15.0 ?m or less; an average aspect ratio of the ?-phase crystal grains is 1.0 or more and 3.0 or less; and a coefficient of variation of a number density of ?-phase crystal grains distributed in the ? phase is 0.30 or less.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: May 25, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Genki Tsukamoto, Kazuhiro Takahashi, Hideto Seto
  • 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