Patents Assigned to Nippon Steel & Sumitomo Metal Corporation
  • Patent number: 11028456
    Abstract: An electric resistance welded steel pipe for a torsion beam, in which a base metal portion includes, in terms of % by mass, 0.04 to 0.12% of C, 0.03 to 1.20% of Si, 0.30 to 2.50% of Mn, 0.08 to 0.24% of Ti, 0.005 to 0.500% of Al, 0.01 to 0.06% of Nb, and 0.0005 to 0.0100% of N, a balance including Fe and impurities, wherein Vc90, defined by the following Formulae (i) and (ii), is 200 or more, a mass ratio of Ti content to C content is from 0.85 to 5.00, an areal ratio of ferrite is 80% or more, an average crystal grain size of ferrite crystal grains is 10 ?m or less, and an average aspect ratio of ferrite crystal grains is 2.0 or less, in a metallographic microstructure of a central portion in a wall thickness direction of the base metal portion; log Vc90=2.94?0.75(?a?1)??Formula (i); ?a=2.7C+0.4Si+Mn+0.45Ni+0.8Cr+Mo??Formula (ii).
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: June 8, 2021
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takaaki Fukushi, Yasuhiro Shinohara, Hideki Hamatani
  • Patent number: 10888906
    Abstract: A piercer plug having good base-material deformation resistance is provided. A method of manufacturing a piercer plug (10) includes the steps of; preparing a plug body (1) including a tip portion (11) and a cylindrical portion (12) having a hole (121) usable to attach a bar and located rearward of the tip portion (11); forming a build-up layer (2) on the surface of the tip portion (11); and heating the plug body (1) such that the temperature of the tip portion (11) with the build-up layer (2) formed thereon is not lower than the austenite transformation temperature and the temperature of the cylindrical portion (12) is lower than the austenite transformation temperature.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: January 12, 2021
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yasuyoshi Hidaka, Yasuto Higashida, Naoya Shirasawa, Yuichi Yamanari
  • Publication number: 20200376534
    Abstract: A hot-stamping formed article is formed of a single steel sheet, and includes: a top sheet portion; a pair of standing wall portions; and a protrusion portion which connects the top sheet portion to the standing wall portion and protrudes outward from the top sheet portion, in which the protrusion portion includes an inner wall portion which stands upright from the top sheet portion, and an outer wall portion which is folded outward from an end edge of the inner wall portion, and an angle between the top sheet portion and the protrusion portion is 80° to 90°.
    Type: Application
    Filed: July 13, 2017
    Publication date: December 3, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Kenichiro OTSUKA
  • Publication number: 20200370159
    Abstract: Steel materials for continuously variable transmissions sheaves, and methods for manufacturing a continuously variable transmission sheaves, are provided. In the disclosed steel materials for continuously variable transmission sheaves, the steel materials satisfy the following expressions: 13.9?Fn1?15.5, and 1.20?Fn2?4.35 (in which Fn1=7×Cr?6×Si+4×Mn; and Fn2=Al×N×104).
    Type: Application
    Filed: July 18, 2017
    Publication date: November 26, 2020
    Applicants: AISIN AW CO., LTD., NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masashi HATTORI, Kazumichi TSUKUDA, Hiroyuki NOZAKI, Daisuke KASAI, Takuya WATANABE, Tetsuya OHASHI, Shouji TOUDOU, Akira SHIGA
  • Publication number: 20200370142
    Abstract: A drawn steel wire has a predetermined chemical composition; in a region of the drawn steel wire that is closer to an axis line than a depth of 100 ?m from a surface of the drawn steel wire in a lengthwise-section that includes the axis line of the drawn steel wire, a metallographic structure includes 90% or more of a drawn pearlite by an area ratio; in a region of the drawn steel wire that is the depth of 100 ?m from the surface of the drawn steel wire in the lengthwise-section, the metallographic structure includes 70% or more of the drawn pearlite by the area ratio; when D in units of millimeters represents a diameter of the drawn steel wire, ?HV represents a standard deviation of a Vickers hardness of the surface of the drawn steel wire, and Rp0.2 represents a yield strength of the drawn steel wire, ?HV<(?9500×ln(D)+30000) exp(?0.003×Rp0.2) is satisfied, and a tensile strength TS of the drawn steel wire is 1770 MPa or higher.
    Type: Application
    Filed: July 14, 2017
    Publication date: November 26, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshiyuki MANABE, Daisuke HIRAKAMI, Makoto OKONOGI, Naoki MATSUI, Arata ISO
  • Publication number: 20200354810
    Abstract: A high-strength steel wire includes a predetermined chemical composition. In the high-strength steel wire, a metallographic microstructure includes a pearlite structure of not less than 95% by area, an average aspect ratio R of a pearlite block, measured in a surface layer in a cross section in an axial direction including an axis of the steel wire, is 2.0 or more, assuming that a diameter of the steel wire is D, a ratio of an average aspect ratio measured in the surface layer to an average aspect ratio measured at a position of 0.25D is 1.1 or more in the cross section in the axial direction including the axis of the steel wire, and a tensile strength of the steel wire is 1,800 MPa or more.
    Type: Application
    Filed: July 28, 2017
    Publication date: November 12, 2020
    Applicant: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Makoto OKONOGI, Naoki MATSUI
  • Publication number: 20200306866
    Abstract: There is provided a resistance spot welding apparatus including a first rod-shaped electrode body, second rod-shaped electrode body, first ring-shaped member, second ring-shaped member, first elastic body, and second elastic body. The first rod-shaped electrode body and second rod-shaped electrode body are arranged facing each other, the first rod-shaped electrode body is inserted into a through hole of the first ring-shaped member, the first elastic body is connected to an opposite side of first ring-shaped member to second rod-shaped electrode body side, the first rod-shaped electrode body and first ring-shaped member are not electrically connected to each other, the second rod-shaped electrode body is inserted into a through hole of the second ring-shaped member, the second elastic body is connected to an opposite side of second ring-shaped member to first rod-shaped electrode body side, and the second rod-shaped electrode body and second ring-shaped member are not electrically connected each other.
    Type: Application
    Filed: June 15, 2020
    Publication date: October 1, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshiaki NAKAZAWA, Tohru Okada, Yasuhiro Ito, Masanori Yasuyama, Yasunori Sawa
  • Publication number: 20200307159
    Abstract: A steel sheet for a container includes: a steel sheet; an Ni plated layer, which is arranged on at least one side of the steel sheet and is adhered in an amount of from 0.3 to 3 g/m2 per side in terms of metal Ni amount; and a chromate coated film or a Zr coated film which is arranged on the Ni plated layer, in which the Ni plated layer contains from 0.1 to 20% by mass of ZnO particles per side in terms of metal Zn amount.
    Type: Application
    Filed: May 24, 2017
    Publication date: October 1, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Shigeru HIRANO, Yoshiaki TANI, Shintaro YAMANAKA, Hirokazu YOKOYA
  • Publication number: 20200290112
    Abstract: A production method includes a preforming process, a forming process and a finish forging process. In the preforming process, an intermediate preform is formed from a billet. In the forming process, while each of a plurality of rough journals of the intermediate preform is held and pressed vertically by a pair of holding dies, rough pins are decentered in directions perpendicular to the pressing direction by the holding dies and an axial direction of the intermediate preform, and the intermediate preform is pressed in the axial direction of the intermediate preform. In the finish forging process, a final preform is placed such that the directions in which the rough pins are decentered are parallel to a horizontal direction, and the thus placed final preform is pressed vertically by a pair of pressing dies. The production method reduces the risk of occurrence of seams on a forged crankshaft.
    Type: Application
    Filed: August 24, 2017
    Publication date: September 17, 2020
    Applicant: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Junichi OKUBO, Kenji TAMURA, Kunihiro YOSHIDA, Samsoo HWANG, Ryusuke NAKANO, Masao HORI
  • Patent number: 10756612
    Abstract: The disclosed is a deceleration device including a cylindrical brake member fixed to a rotary shaft, a plurality of permanent magnets arrayed in a circumferential direction of a circle around the rotary shaft, a cylindrical magnet holder holding the permanent magnets, and a switching mechanism that switches between a braking state and a non-braking state. The plurality of permanent magnets include primary magnets and secondary magnets that are arrayed alternatively in the circumferential direction. When viewed on a surface facing the brake member, north poles of the primary magnets are circumferentially adjacent to and in contact with north poles of the secondary magnets, and south poles of the primary magnets are circumferentially adjacent to and in contact with south poles of the secondary magnets. The magnetic holder is ferromagnetic.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: August 25, 2020
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kenji Imanishi, Hiroshi Nogami, Yasutaka Noguchi, Hiroyuki Yamaguchi, Takuya Fujita
  • Patent number: 10749416
    Abstract: A method is for manufacturing a core plate having an annular core back and teeth extending from the core back toward the center. The core plate is obtained by performing a punching step, a winding step, a straining step and an annealing step. At the straining step, compressive strain is applied to the core back or the band-shaped core back that is to be the core back after winding. At the annealing step, the core back or the band-shaped core back is annealed to be recrystallized after the applying of strain.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: August 18, 2020
    Assignees: DENSO CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tetsuya Aoki, Takeshi Senoo, Keiichi Okazaki, Satoshi Doi, Hiroshi Fujimura, Hiroaki Sato
  • Publication number: 20200230683
    Abstract: A burring method includes: a placement process of disposing a sheet-shaped workpiece formed with a through hole such that a punch is positioned on one sheet thickness direction side of the workpiece and a pad is positioned on the opposite side to the one sheet thickness direction side of the workpiece; and an extrusion process of forming a flange by moving the punch toward the opposite side relative to the workpiece and extruding a peripheral rim of the through hole in the workpiece with the punch in a state in which the peripheral rim of the through hole is pressed by the punch and the pad in the sheet thickness direction of the workpiece.
    Type: Application
    Filed: January 20, 2017
    Publication date: July 23, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Yasuhiro ITO
  • Patent number: 10704625
    Abstract: A brake disc for a railway vehicle is provided in which noise arising from the brake disc during high-speed rotation of a wheel is reduced by a large margin. A brake disc for a railway vehicle includes: a disc plate portion that has a sliding portion on a front face thereof; a plurality of through-holes that pass from the front face to a rear face of the disc plate portion and are arranged in alignment in the circumferential direction of the disc plate portion, the through-holes allowing bolts to pass therethrough for fastening together the disc plate portion and a wheel of the railway vehicle; and a groove provided to link a plurality of through-holes on the front face side of the disc plate portion.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: July 7, 2020
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Nobuo Shiraishi, Yusuke Wakabayashi, Takeshi Kurita, Takahiro Fujimoto, Hiroshi Nogami, Atsushi Sakaguchi, Takanori Kato, Yuki Ichikawa
  • Publication number: 20200182286
    Abstract: A carburized shaft part having a predetermined composition, a C content at a surface layer part of a mass % of 0.60 to 1.00%, at least one hole at an outer circumferential surface, a total volume ratio of martensite and retained austenite of 97% or more at a structure at a position of a 1 mm depth from the outer circumferential surface in an axial direction of the hole and a position of a 20 ?m depth from the surface of the hole, a maximum retained austenite volume ratio (R1) of 10.0 to 30.0% at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a range up to a 200 ?m depth from the surface of the hole, and a retained austenite reduction ratio of 20% or more found from R1 and the retained austenite volume ratio (R2) at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a position of a 20 ?m depth from the surface of the hole by the formula (A): ??=(R1?R)/R1×100.
    Type: Application
    Filed: September 20, 2017
    Publication date: June 11, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tatsuya IWASAKI, Koji WATARI, Hidekazu SUENO
  • Publication number: 20200165711
    Abstract: According to an aspect of the present invention, there is provided a steel containing, by unit mass %, C: 0.08% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.50% to 3.00%, P: 0.040% or less, S: 0.020% or less, V: 0.010% or less, Ti: 0.010% or less, Nb: 0.005% or less, Cr: 1.00% to 2.50%, Cu: 0.01% to 0.50%, Ni: 0.75% to 1.60%, Mo: 0.10% to 0.50%, Al: 0.025% to 0.050%, N: 0.0100% to 0.0200%, Ca: 0% to 0.0100%, Zr: 0% to 0.0100%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which a ratio of an Al content to a N content is 2.6 or less, a ratio of a Mn content to a Ni content is 1.5 or more and 3.0 or less.
    Type: Application
    Filed: February 19, 2016
    Publication date: May 28, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Shinya TERAMOTO, Shingo YAMASAKI, Atsushi MONDEN
  • Publication number: 20200157666
    Abstract: A hot press-formed part according to an aspect of the present invention contains a predetermined chemical composition; in which a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite: 20% to 90%, bainite: 5% to 75%, and residual austenite: 5% to 25%, and ferrite is limited to 10% or less; and a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher.
    Type: Application
    Filed: August 16, 2016
    Publication date: May 21, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Mutsumi SAKAKIBARA, Natsuko SUGIURA, Kunio HAYASHI, Kaoru KAWASAKI
  • Publication number: 20200141023
    Abstract: The object of the present invention is such that a surface exchange of metal fine particles by Cu ions, or the like is inhibited in order to prevent formation of Artificial CuS or the like, in extraction and analysis of the metal fine particles (inclusions and precipitates) in a metal material by electrolytic corrosion in a solvent-based electrolytic solution, without significantly changing conventional extraction and analysis methods.
    Type: Application
    Filed: February 17, 2017
    Publication date: May 7, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Kazumi MIZUKAMI
  • Publication number: 20200141843
    Abstract: The object of the present invention is such that a surface exchange of metal fine particles by Cu ions, or the like is inhibited in order to prevent formation of Artificial CuS or the like, in extraction and analysis of the metal fine particles (inclusions and precipitates) in a metal material by electrolytic corrosion in a solvent-based electrolytic solution, without significantly changing conventional extraction and analysis methods, and such that the metal deposited on the cathode is actively attached to the cathode so that the deposited metal does not become a contamination source.
    Type: Application
    Filed: February 17, 2017
    Publication date: May 7, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Kazumi MIZUKAMI
  • Publication number: 20200127596
    Abstract: A selective emitter exhibiting heat resistance up to 1000° C., comprising a metal body, a first dielectric layer provided on one surface of the metal body, a composite layer provided on another surface of the first dielectric layer at an opposite side to the metal body side, and a second dielectric layer provided on another surface of the composite layer at an opposite side to the first dielectric layer, the composite layer being a layer provided with a metal or semiconductor dispersed in an oxide of the metal or the semiconductor.
    Type: Application
    Filed: March 29, 2017
    Publication date: April 23, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Shinji TOKUMARU, Tomohiro UNO
  • Publication number: 20200123625
    Abstract: Steel wire rod etc. enabling elimination the heat treatment processes of spheroidizing annealing and of quenching and tempering are provided. A predetermined chemical composition is provided, 90% or more of the microstructure by area ratio is bainite, the mean bainite block size of the surface layer measured at the cross-section is 15 ?m or less, the ratio of the mean bainite block size of the surface layer measured at the cross-section and the mean bainite block size measured at the center part is less than 1.0, and the mean particle size of cementite dispersed in bainite is 0.1 ?m or less.
    Type: Application
    Filed: July 5, 2017
    Publication date: April 23, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Makoto OKONOGI, Naoki MATSUI