Patents Assigned to NIPPON STEEL NISSHIN CO., LTD.
  • Patent number: 11093670
    Abstract: A hot-dip coating equipment includes a cooling rate determining device that includes: a coefficient obtaining section configured to obtain coefficients ?, ?, ?, and ? associated with the hot-dip coating bath, in the following equation that expresses a degree of discoloration YI of the surface of a hot-dip coated steel sheet; and a rate determining section configured to determine an average cooling rate A so as to allow the YI of the following Expression (1) to be not more than a predetermined reference value, YI =(?×[SE]+?)×{(T?ST)/A}1/2+?×[SE]+? . . . (1), where: [SE] is a concentration (mass %) of a specific element contained in the hot-dip coating bath; T is a temperature (° C.) of the hot-dip coating bath; and ST is a solidification temperature (° C.) at which the hot-dip coating bath is solidified.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: August 17, 2021
    Assignees: NIPPON STEEL NISSHIN CO., LTD., NS Wheeling-Nisshin, Inc.
    Inventors: Koutarou Ishii, Shinya Furukawa, Shinichi Koga, Yasunori Hattori, Patrick Edward Pendleton, Kazuhiro Yamada
  • Patent number: 11091669
    Abstract: The purpose of the present invention is to provide a coating material that is for a coated metal plate, that has high storage stability, that is less likely to contaminate a heating device, and that can be used to produce a coated metal plate having a surface on which rain streaks are less likely to occur and having high scratch resistance. The coating material contains a silicone resin including 5-50 mol % of a silanol group with respect to the total number of moles of Si atoms.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: August 17, 2021
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Masaki Satou, Seiju Suzuki, Shuichi Sugita
  • Patent number: 10975899
    Abstract: A welded member includes a hot dip Zn-based alloy coated steel sheet as a base material and has excellent corrosion resistance and weld bead shear strength. In the welded member in which a lower sheet and an upper sheet, which are hot dip Zn-based alloy coated steel sheets, are stacked and arc-welded together, a weld bead is formed so that a cross-sectional width W satisfies the following formula 2T?W?6T, and a blowhole occupancy Br represented by the following formula becomes not more than 50%: Br=(?di/L)×100, where T represents a thickness of the hot dip Zn-based alloy coated steel sheet, di represents a length of an i-th blowhole observed in X-ray radiography, and L represents a length of the weld bead.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: April 13, 2021
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Tomokazu Nobutoki, Takefumi Nakako
  • Patent number: 10957461
    Abstract: A method of producing an Al plated steel wire comprises a first step of continuously immersing a material steel wire formed of a steel core into a molten Al plating bath and then withdrawing the material steel wire to a gas phase space. The material steel wire plated with a plating metal is brought into contact with a contact member at the plating bath rising portion to produce the Al plated steel wire, the Al plated steel wire having an average diameter DA (mm) and a minimum diameter DMIN (mm) in the longitudinal direction of the wire satisfying the following expression (1) (DA?DMIN)/DA?0.10,??(1). The Al plated steel wire is then wound.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: March 23, 2021
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Shinichi Kamoshida, Tadaaki Miono, Yasunori Hattori, Takeshi Shimizu
  • Patent number: 10906125
    Abstract: Provided is a method for manufacturing an electric resistance welded metal pipe by butting side ends of a metal strip against each other and then welding the side ends by high frequency heating to manufacture an electric resistance welded metal pipe, each side end being provided with an inner surface side corner portion located on an inner surface side of the electric resistance welded metal pipe, wherein the method comprises a step of forming an inclined surface at the inner surface side corner portion before butting the side ends of the metal strip; and wherein the side ends are butted and welded to each other such that the inclined surface remains on an excess metal of the metal pipe after electric resistance welding and a discharged metal is not welded to the excess metal.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: February 2, 2021
    Assignees: Nippon Steel Nisshin Co., Ltd., Nippon Steel Nisshin Pipe Co., Ltd
    Inventors: Kouji Omosako, Makoto Akiduki, Shigenobu Igawa, Yasumasa Makihara, Ryota Tanaka
  • Publication number: 20200384321
    Abstract: The golf club shaft of this invention contains C in an amount of 0.4 mass % to 0.65 mass %, Si in an amount of more than 0 mass % and not more than 0.80 mass %, Mn in an amount of 0.1 mass % to 1.50 mass %, Cr in an amount of more than 0 mass % and less than 0.30 mass %, and at least one element selected from the group consisting of V in an amount of 0.05 mass % to 0.40 mass %, Nb in an amount of 0.03 mass % to 0.15 mass % and Ti in an amount of 0.01 mass % to 0.10 mass %, with the balance consisting of Fe and unavoidable impurities, and has a metal structure in which an area ratio of undissolved cementite is not more than 0.5%.
    Type: Application
    Filed: March 2, 2017
    Publication date: December 10, 2020
    Applicant: NIPPON STEEL NISSHIN CO., LTD.
    Inventor: Hironori KUBO
  • Patent number: 10807177
    Abstract: The present invention provides a method for MIG brazing an Al alloy to a steel sheet so as to manufacture a lap joint member that excels in bonding strength with respect to the Al alloy. With the MIG brazing method, a bonding target sheet, specifically, an Al sheet or an Al alloy sheet is bonded to a hot dip Zn-based alloy coated steel sheet (1) whose coating layer contains Al in an amount of 1.0% by mass to 22.0% by mass. A target location of MIG brazing is a region between (i) an intersection (C) of one end of an end surface (6) of the bonding target sheet and the hot dip Zn-based alloy coated steel sheet and (ii) the other end (U) of the end surface of the bonding target sheet.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 20, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Patent number: 10799931
    Abstract: A formed material manufacturing method according to present invention includes the steps of forming a convex formed portion by performing at least one forming process on a surface treated metal plate, and performing ironing on the formed portion using an ironing mold after forming the formed portion. The ironing mold includes a punch that is inserted into the formed portion, and a die having a pushing hole into which the formed portion is pushed together with the punch. An inner peripheral surface of the pushing hole extends non-parallel to an outer peripheral surface of the punch, and the inner peripheral surface is provided with a clearance that corresponds to an uneven plate thickness distribution, in the pushing direction, of the formed portion prior to the ironing relative to the outer peripheral surface to ensure that an amount of ironing applied to the formed portion remains constant in the pushing direction.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: October 13, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Naofumi Nakamura, Yudai Yamamoto, Jun Kurobe
  • Patent number: 10792746
    Abstract: The present invention provides a method for laser brazing an Al alloy to a steel sheet so as to produce a lap joint member that excels in bonding strength with respect to the Al alloy. The laser brazing method includes a brazing step of forming a brazed part (9) for bonding an Al alloy (3) to a hot dip Zn-based alloy coated steel sheet (1) in which a coating layer (2) contains 1.0 to 22.0% by mass of Al and a coating weight per surface is 15 to 250 g/m2.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 6, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Patent number: 10788472
    Abstract: The present invention provides a method for evaluating the quality of steam-treated products, allowing easy, quick and precise evaluation of the quality of oxide films in steam-treated products such as black coated steel sheets. Specifically, the present invention provides a method for evaluating the quality of steam-treated products with a surface oxide film formed during steam treatment, wherein test pieces (100) are cut out from said steam-treated products to measure the amount of oxygen in said test pieces (100) as a basis for evaluating the brightness of the surface(s) of said test pieces and/or the thickness of the oxide film of said test pieces.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: September 29, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Shin Ueno, Tadashi Nakano
  • Publication number: 20200224301
    Abstract: A hot-dip aluminum-coated steel wire including a steel wire having a diameter of 0.1 to 0.4 mm on which a plating layer is formed, wherein an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%, and a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the formula: [minimum diameter/average diameter]?[1?(elongation at break (%)/100)], and a method for producing a hot-dip aluminum-coated steel wire including wire-drawing a hot-dip aluminum-coated steel wire so that a ratio of an average diameter of the steel wire which is taken out from the hot-dip aluminum-coated steel by removing the plating layer per 100 mm in length of the steel wire to the minimum diameter of the steel wire satisfies the above-mentioned formula, and an elongation at break of the hot-dip aluminum-coated steel wire is 5 to 30%.
    Type: Application
    Filed: July 5, 2017
    Publication date: July 16, 2020
    Applicant: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Shinichi KAMOSHIDA, Tadaaki MIONO, Yasunori HATTORI
  • Publication number: 20200225136
    Abstract: A thread guide wear testing machine wears a test piece by causing a thread to slide while the thread contacts the test piece. The thread guide wear testing machine includes a winding reel winding the thread thereon fed from thread feeder. A winding drum guides the thread fed from the thread feeder to the winding reel. The winding drum has an outer peripheral surface contacting an outer peripheral surface of the winding reel. Specimen holder is on a path of the thread fed from the thread feeder and moves while being wound on the winding reel. The specimen holder holds the test piece in contact with the thread under a predetermined load. Tension adjuster adjusts tension on the thread when the test piece is in contact. Contact retainer retains a state of contact between the winding reel and the winding drum by pressing the winding reel toward the winding drum.
    Type: Application
    Filed: August 25, 2017
    Publication date: July 16, 2020
    Applicant: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Masaru FUJIHARA, Dai MIYAWAKI
  • Patent number: 10704897
    Abstract: The present invention provides a method for detecting a shape of a butt joint of a welded steel pipe. A specific detection range including a butt joint of a welded steel pipe is scanned with a non-contact means to obtain geometric coordinate data. Coordinates of a start point and an end point of the specific detection range, a first selected point located between the start point and the butt joint, and a second selected point located between the butt joint and the end point are selected from the geometric coordinate data. A first approximate circle including the start point, the end point, and the first selected point, and a second approximate circle including the start point, the end point, and the second selected point are calculated. A deviation between the first and the second approximate circles is used as an index representing the shape of the butt joint.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: July 7, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Takafumi Hiramoto, Yasuyuki Kino, Teruo Ehara
  • Patent number: 10670350
    Abstract: Provided is a method of manufacturing a heat exchanger by diffusion bonding in which deformation of bonding members as stainless steel plates is suppressed, and releasability (detachability of a bonding member from a release member) after diffusion bonding treatment is excellent. Provided is a method of manufacturing a heat exchanger, the method including layering a plurality of bonding members 1 made of stainless steel, and applying heat and pressure to effect diffusion bonding of the bonding members 1, in which release members 3 are arranged on the both surface sides of the bonding members 1, and holding jigs 4 are arranged so as to sandwich the bonding members 1 through the release members 3, and pressing is then performed through the holding jigs 4 with a pressure device, and in which the diffusion bonding is performed using a combination of the release members 3 and the bonding members 1, the release members 3 including a steel material containing 1.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: June 2, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Yoshiaki Hori, Kazunari Imakawa
  • Patent number: 10662492
    Abstract: An abrasion-resistant steel material excellent in fatigue characteristics having a composition (in mass %) comprising 0.30 to 0.90% of C, 0.05 to 1.00% of Si, 0.10 to 1.50% of Mn, 0.003 to 0.030% of P, 0.001 to 0.020% of S, from 0.10 to 0.70% of Nb, and containing depending on necessity one or more of 1.50% or less of Cr, 0.50% or less of Mo, 0.50% or less of V, 2.00% or less of Ni, 0.10% or less of Ti, and 0.0050% or less of B, the balance Fe and unavoidable impurities, a metallic structure after a temper heat treatment having a Nb-containing carbide dispersed therein, the Nb-containing carbide particles having a particle diameter of 1.0 mm or more that is controlled to 200 particles per mm2 or more, and a maximum particle diameter Dmax of Nb-containing carbide particles in 103 mm3 that is controlled to 18.0 mm or less.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: May 26, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventor: Hironori Kubo
  • Patent number: 10639743
    Abstract: A vacuum insulation panel manufacturing method that makes it possible to manufacture low-cost, high-performance vacuum insulation panels, and a vacuum insulation panel are provided.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: May 5, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Tsutomu Azuma, Hirohisa Mishima, Takefumi Nakako
  • Patent number: 10632564
    Abstract: A vacuum insulation panel manufacturing method that makes it possible to manufacture low-cost, high-performance vacuum insulation panels, and a vacuum insulation panel are provided.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: April 28, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Tsutomu Azuma, Hirohisa Mishima, Takefumi Nakako
  • Patent number: 10619069
    Abstract: This chemical conversion-treated steel sheet (10) has a chemical conversion treatment coating (12) upon a plating layer (17) of a steel sheet (11). The chemical conversion treatment coating (12) contains a fluororesin, a base resin which is a resin other than a fluororesin, metal flakes (13), and a chemical conversion treatment component. The content of the fluororesin in relation to the total quantity of resins is 3.0 mass % or more in terms of fluorine atoms, the content of the base resin in relation to 100 parts by mass of the fluororesin is 10 parts by mass or more, and the content of metal flakes (13) in the chemical conversion treatment coating (12) is more than 20 mass % but at most 60 mass %.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: April 14, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Masanori Matsuno, Masaya Yamamoto
  • Patent number: 10603746
    Abstract: A laser-welded shape section steel includes a web member and a flange member each made of a steel plate, the steel plate having an equivalent carbon content Ceql of not less than 0.075 and not more than 0.15, the equivalent carbon content Ceql being represented by the following formula: Ceql=C+(Si/50)+(Mn/25)+(P/2)+(Cr/25)+Ti, where a welded part, which is a joint part in which the web member and the flange member are joined, has a hardness of not less than 1.2 times and not more than 4 times as hard as that of the steel plate, and the welded part a protrusion length of not greater than 1 mm.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: March 31, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Toru Ienari, Yasuhiro Sakurada, Hiroshi Asada
  • Patent number: 10603733
    Abstract: The present invention provides a method for producing a TIG-welded stainless steel tube without adding H2 to a shielding gas, while inhibiting generation of a weld defect. The method is a method for producing a TIG-welded stainless steel tube and includes the steps of bending a stainless steel strip in a width direction so as to butt both edges against each other and TIG-welding the both edges thus butted. A pulse waveform of a pulse frequency of 40 Hz to 300 Hz is used as a current waveform of a welding power source.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: March 31, 2020
    Assignee: Nippon Steel Nisshin Co., Ltd.
    Inventors: Takefumi Nakako, Tomokazu Nobutoki, Hiroshi Asada