Patents by Inventor Kei Miyanishi

Kei Miyanishi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10889870
    Abstract: In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: January 12, 2021
    Assignees: AISIN AW CO., LTD., NIPPON STEEL CORPORATION
    Inventors: Koji Obayashi, Kazuaki Okada, Keisuke Matsuzaka, Masashi Sakakibara, Manabu Kubota, Kei Miyanishi, Tatsuya Koyama
  • Publication number: 20200407816
    Abstract: A bearing steel part having a predetermined chemical composition, in which the number density of oxide particles having an equivalent circle diameter of 5 ?m or more, and containing CaO, Al2O3 and SiO2, such that the content ratio of Al2O3 with respect to the total mass of CaO, Al2O3, and SiO2 is 50% by mass or more, is 3.0/cm2 or less in an arbitrary cross section of the part, and in which the Vickers hardness at a depth of 50 ?m from a rolling surface is 750 or more, and in which the compressive residual stress at the rolling surface is 900 MPa or more. Also provided is a steel bar for a bearing steel part that is suitable for obtaining the foregoing bearing steel part.
    Type: Application
    Filed: January 22, 2019
    Publication date: December 31, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Tatsuya KOYAMA, Kei MIYANISHI, Yutaka NEISHI
  • Publication number: 20200340072
    Abstract: A carburized bearing steel part has a predetermined chemical composition, and, in the carburized bearing steel part, the number density of oxide particles having an equivalent circle diameter of 5 ?m or more, and containing CaO, Al2O3 and SiO2, such that the content ratio of Al2O3 with respect to the total mass of CaO, Al2O3, and SiO2 is 50% by mass or more, is 3.0/cm2 or less in an arbitrary cross section of the part, the Vickers hardness at a depth of 50 ?m from a rolling surface is 750 or more, and the compressive residual stress at the rolling surface is 900 MPa or more. Also provided is a steel bar for a carburized bearing steel part that is suitable for obtaining the foregoing carburized bearing steel part.
    Type: Application
    Filed: January 22, 2019
    Publication date: October 29, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Tatsuya KOYAMA, Kei MIYANISHI, Yutaka NEISHI
  • Patent number: 10808304
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and by area fraction, 85% or more of pearlite. In the steel, a ratio of a number of composite inclusions to a total number of Al2O3 inclusions and the composite inclusions that contain 2.0% or more of SiO2 and 2.0% or more of CaO is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?1.05??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: October 20, 2020
    Assignee: Nippon Steel Corporation
    Inventors: Yutaka Neishi, Akira Shiga, Kei Miyanishi
  • Patent number: 10801091
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, P: less than 0.020%, S: less than 0.020%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, O: 0.0015% or less, V: 0.01 to 0.25%, B: 0.0003 to 0.0040%, Ti: 0.010 to 0.050%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and pearlite. A ratio of a number of composite inclusions is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?1.05??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: October 13, 2020
    Assignee: Nippon Steel Corporation
    Inventors: Akira Shiga, Yutaka Neishi, Kei Miyanishi
  • Patent number: 10793937
    Abstract: A steel for induction hardening according to an aspect includes, as a chemical composition, predetermined amounts of alloy elements and a remainder including Fe and impurities, in which Al×N is 0.000330 to 0.000825, Mn/S is 4.6 to 14.0, a machinability index M is 15.5 to 25.65, an area fraction of AlN having an equivalent circle diameter of more than 200 nm at a ¼ position of a diameter of the steel is 20% or less of an area fraction of all AlN having an equivalent circle diameter of 40 nm or more, and a number density of Mn sulfide-based inclusions having a maximum diameter of 0.3 ?m or more and 10 ?m or less at the ¼ position of the diameter is 100 pieces/mm2 or more and 2500 pieces/mm2 or less.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: October 6, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Toshiharu Aiso, Suguru Yoshida, Kei Miyanishi
  • Publication number: 20200280047
    Abstract: There is provided an all-solid-state lithium battery including: a positive-electrode plate composed of a lithium complex oxide sintered body having a layered rock-salt structure; a solid electrolyte layer composed of a lithium-ion-conductive antiperovskite material; a negative-electrode plate containing Ti and permitting intercalation and deintercalation of lithium ions at 0.4 (vs. Li/Li+) V or more; a positive-electrode current collecting layer provided on a face, remote from the solid electrolyte layer, of the positive-electrode plate; a negative-electrode current collecting layer provided on a face, remote from the solid electrolyte layer, of the negative-electrode plate; a positive-electrode covering metal membrane provided at an interface between the positive-electrode plate and the solid electrolyte layer; and a negative-electrode covering metal membrane provided at an interface between the negative-electrode plate and the solid electrolyte layer.
    Type: Application
    Filed: May 18, 2020
    Publication date: September 3, 2020
    Applicant: NGK INSULATORS, LTD.
    Inventors: Kei TANAKA, Miyuki KOJIMA, Keita MIYANISHI, Yosuke SATO, Yuji KATSUDA, Yukihisa TAKEUCHI
  • Publication number: 20190300994
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.53 to less than 0.58%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, P: less than 0.020%, S: 0.025% or less, Al: more than 0.06% to 0.15%, N: 0.0020 to 0.0080%, O: 0.0015% or less, B: 0.0003 to 0.0040%, Ti: 0.010 to 0.050%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and pearlite. A ratio of a number of composite inclusions is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?0.98??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Application
    Filed: July 19, 2017
    Publication date: October 3, 2019
    Inventors: Kei Miyanishi, Yutaka Neishi, Akira Shiga
  • Publication number: 20190300992
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and by area fraction, 85% or more of pearlite. In the steel, a ratio of a number of composite inclusions to a total number of Al2O3 inclusions and the composite inclusions that contain 2.0% or more of SiO2 and 2.0% or more of CaO is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?1.05??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Application
    Filed: July 19, 2017
    Publication date: October 3, 2019
    Inventors: Yutaka Neishi, Akira Shiga, Kei Miyanishi
  • Publication number: 20190300993
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, P: less than 0.020%, S: 0.025% or less, Al: more than 0.06% to 0.15%, N: 0.0020 to 0.0080%, O: 0.0015% or less, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and pearlite. In the steel, a ratio of a number of composite inclusions to a total number of Al2O3 inclusions and the composite inclusions is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?1.05??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Application
    Filed: July 19, 2017
    Publication date: October 3, 2019
    Inventors: Yutaka Neishi, Kei Miyanishi, Akira Shiga
  • Publication number: 20190241997
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.53 to less than 0.58%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, P: less than 0.020%, S: less than 0.020%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, O: 0.0015% or less, B: 0.0003 to 0.0040%, Ti: 0.010 to 0.050%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and pearlite. A ratio of a number of composite inclusions is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?0.98??(1) C+Si/10+Mn/20+Cr/25?0.70??(2) Cr/Si?0.
    Type: Application
    Filed: July 19, 2017
    Publication date: August 8, 2019
    Applicant: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yutaka NEISHI, Akira SHIGA, Kei MIYANISHI
  • Publication number: 20190236472
    Abstract: A manufacturing assistance apparatus includes a learning unit and an estimator. The learning unit is configured to load a plurality of pieces of actual measurement data in each of which a gap and a plurality of parameters are associated with each other, and construct an estimation model on the basis of machine learning in which the plurality of pieces of actual measurement data serve as teacher data. The gap is provided between a first workpiece and a second workpiece that eventually structure an airframe of an aircraft and that are eventually fastened to each other. The estimation model estimates the gap from the plurality of parameters. The estimator is configured to derive an estimation value of a length of the gap on which measurement has not yet been performed, on the basis of the estimation model constructed by the learning unit and the plurality of parameters.
    Type: Application
    Filed: December 4, 2018
    Publication date: August 1, 2019
    Applicant: SUBARU CORPORATION
    Inventors: Toshimasa KOBAYASHI, Marosuke KIKUCHI, Yoichi SATO, Yuki MATSUDA, Toshimichi OGISU, Daisuke HIRABAYASHI, Kei SUZUKI, Toru ONISHI, Haruka MIYANISHI
  • Publication number: 20190153574
    Abstract: A steel for induction hardening according to the present invention includes a chemical composition consisting of, in mass percent: C: 0.58 to 0.68%, Si: 0.70 to 1.40%, Mn: 0.20 to 1.40%, P: less than 0.020%, S: less than 0.020%, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, 0: 0.0015% or less, V: 0.01 to 0.25%, B: 0.0003 to 0.0040%, Ti: 0.010 to 0.050%, and Ca: 0.0005 to 0.005%, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). The steel microstructure is made up of ferrite and pearlite. A ratio of a number of composite inclusions is 20% or more. C+Si/7+Mn/5+Cr/9+Mo/2.5?1.05 ??(1) C+Si/10+Mn/20+Cr/25?0.70 ??(2) Cr/Si?0.
    Type: Application
    Filed: July 19, 2017
    Publication date: May 23, 2019
    Inventors: Akira Shiga, Yutaka Neishi, Kei Miyanishi
  • Publication number: 20190078171
    Abstract: In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.
    Type: Application
    Filed: March 8, 2017
    Publication date: March 14, 2019
    Applicants: AISIN AW CO., LTD., NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koji OBAYASHI, Kazuaki OKADA, Keisuke MATSUZAKA, Masashi SAKAKIBARA, Manabu KUBOTA, Kei MIYANISHI, Tatsuya KOYAMA
  • Publication number: 20190002999
    Abstract: A case hardening steel includes, as a chemical composition, by mass %, C: 0.10% to 0.30%, Si: 0.02% to 1.50%, Mn: 0.30% to 1.80%, S: 0.003% to 0.020%, Cr: 0.40% to 2.00%, Al: 0.005% to 0.050%, Ti: 0.06% to 0.20%, Bi: 0.0001% to 0.0050%, Mo: 0% to 1.50%, Ni: 0% to 3.50%, V: 0% to 0.50%, B: 0% to 0.0050%, Nb: 0% or more and less than 0.040%, P: limited to 0.050% or less, N: limited to 0.0060% or less, O: limited to 0.0025% or less, and a remainder including an iron and impurities, and satisfies Ti/S?6.0, in which, in a longitudinal section, a maximum diameter of Ti-based precipitates predicted by extreme value statistics under a condition that an inspection standard area is 100 mm2, a number of inspections is 16 visual fields, and an area where prediction is performed is 30,000 mm2, is 40 ?m or less.
    Type: Application
    Filed: December 28, 2016
    Publication date: January 3, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kei MIYANISHI, Akira SHIGA, Yutaka NEISHI, Hideo MIZUKAMI
  • Publication number: 20180291487
    Abstract: There is provided a steel for machine structural use including, as a chemical composition, by mass %, C: 0.40% to 0.70%, Si: 0.15% to 3.00%, Mn: 0.30% to 2.00%, Cr: 0.01% or more and less than 0.50%, S: 0.003% to 0.070%, Bi: more than 0.0001% and 0.0050% or less, N: 0.0030% to 0.0075%, Al: 0.003% to 0.100%, and P: 0.050% or less; and as necessary, B, Mo, Ni, Cu, Ca, Mg, Zr, Rem, Ti, Nb, V, Sb, Te, and Pb, a remainder including Fe and impurities, in which Expressions 290×C+50×Si+430?620 and d+3?<20 are satisfied, and a presence density of MnS having an equivalent circle diameter of smaller than 2.0 ?m is 300 pieces/mm2 or more in a cross section parallel to a longitudinal direction.
    Type: Application
    Filed: October 14, 2016
    Publication date: October 11, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kei MIYANISHI, Akira SHIGA, Hajime HASEGAWA, Hideo MIZUKAMI
  • Patent number: 9890446
    Abstract: A steel for an induction hardening including, by mass %, C: more than 0.75% to 1.20%, Si: 0.002 to 3.00%, Mn: 0.20 to 2.00%, S: 0.002 to 0.100%, Al: more than 0.050% to 3.00%. P: limited to 0.050% or less, N: limited to 0.0200% or less, O: limited to: 0.0030% or less, and the balance composing of iron and unavoidable impurities, wherein an Al content and a N content satisfy, by mass %, Al?(27/14)×N>0.050%.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: February 13, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Manabu Kubota, Toshiharu Aiso, Kei Miyanishi
  • Patent number: 9777343
    Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: October 3, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Atsushi Mizuno, Masayuki Hashimura, Kei Miyanishi, Shuji Kozawa
  • Publication number: 20170067140
    Abstract: A steel for induction hardening according to an aspect includes, as a chemical composition, predetermined amounts of alloy elements and a remainder including Fe and impurities, in which Al×N is 0.000330 to 0.000825, Mn/S is 4.6 to 14.0, a machinability index M is 15.5 to 25.65, an area fraction of AlN having an equivalent circle diameter of more than 200 nm at a ¼ position of a diameter of the steel is 20% or less of an area fraction of all AlN having an equivalent circle diameter of 40 nm or more, and a number density of Mn sulfide-based inclusions having a maximum diameter of 0.3 ?m or more and 10 ?m or less at the ¼ position of the diameter is 100 pieces/mm2 or more and 2500 pieces/mm2 or less.
    Type: Application
    Filed: February 20, 2015
    Publication date: March 9, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshiharu AISO, Suguru YOSHIDA, Kei MIYANISHI
  • Patent number: 9487848
    Abstract: The present invention provides hot forging use non heat-treated steel where controlled cooling after shaping by hot forging is used to make the main structure of the steel martensite even without subsequent reheating and heat treatment by quenching and tempering and thereby give a steel part with a high strength and high toughness and superior machineability and a hot forged non heat-treated steel part made of that steel, in particular provides a martensite type hot forging use non heat-treated steel characterized by containing, by mass %, C: 0.10 to 0.20%, Si: 0.10 to 0.50%, Mn: 1.0 to 3.0%, P: 0.001 to 0.1%, S: 0.005 to 0.8%, Cr: 0.10 to 1.50%, Al: over 0.1 to 0.20%, and N: 0.0020 to 0.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: November 8, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Shinya Teramoto, Kei Miyanishi, Masayuki Hashimura