Patents by Inventor Hiroyoshi Yashiki

Hiroyoshi Yashiki 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: 11053574
    Abstract: A non-oriented electrical steel sheet according to an aspect of the present invention contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.2% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, one or more of La, Ce, Pr, and Nd: 0.0005% to 0.0200% in total, Ca: 0.0005% to 0.0100%, Ti: 0.0005% to 0.0100%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which Si?0.5×Mn: 2.0% or more, and Si+0.5×Mn: 3.8% or more.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Patent number: 11021771
    Abstract: A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% to 0.050%, Ti: more than 0% and 0.0050% or less, and a remainder including Fe and impurities, in which Sn+Sb: 0.050% or less, Si?0.5×Mn: 2.0% or more, and an O content in a sheet thickness central portion excluding a surface layer portion which is a range from a front surface and a rear surface to a position of 10 ?m in a depth direction is less than 0.0100%.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: June 1, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Publication number: 20200232059
    Abstract: This non-oriented electrical steel sheet including, as a chemical composition, by mass %: C: 0.0100% or less; Si: more than 3.0% and 5.0% or less; Mn: 0.1 to 3.0%; P: 0.20% or less: S: 0.0018% or less: N: 0.0040% or less; Al: 0 to 0.9%; one or more selected from the group consisting of Sn and Sb: 0 to 0.100%; Cr 0 to 5.0%; Ni: 0 to 5.0%; Cu: 0 to 5.0%; Ca: 0 to 0.01%; rare earth elements (REM): 0 to 0.010%; and a remainder including Fe and impurities, in which an area ratio of a crystal structure A composed of crystal grains having a grain size of 100 ?m or greater in a cross section parallel to a rolled surface of the non-oriented electrical steel sheet is 1 to 30%, an average grain size of a crystal structure B that is a crystal structure other than the crystal structure A is 25 ?m or less, and a Vickers hardness HvA of the crystal structure A and a Vickers hardness HvB of the crystal structure B satisfy HvA/HvB?1.000.
    Type: Application
    Filed: March 7, 2018
    Publication date: July 23, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroshi FUJIMURA, Takeru ICHIE, Yoshiaki NATORI, Hiroyoshi YASHIKI
  • Publication number: 20200181725
    Abstract: A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%?Si?0.5×Mn?2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%?Sn+Sb?0.20%.
    Type: Application
    Filed: February 18, 2020
    Publication date: June 11, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Kenichi MURAKAMI, Nobusato MORISHIGE, Hirotoshi TADA, Yoshiaki NATORI
  • Patent number: 10604818
    Abstract: A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%?Si?0.5×Mn?2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%?Sn+Sb?0.20%.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: March 31, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Kenichi Murakami, Nobusato Morishige, Hirotoshi Tada, Yoshiaki Natori
  • Publication number: 20200040423
    Abstract: A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0040%; Si: 3.5% to 4.5%; Al: 0.65% or less; Mn: 0.2% to 2.0%; Sn: 0% to 0.20%; Sb: 0% to 0.20%; P: 0.005% to 0.150%; S: 0.0001% to 0.0030%; Ti: 0.0030% or less; Nb: 0.0050% or less; Zr: 0.0030% or less; Mo: 0.030% or less; V: 0.0030% or less; N: 0.0010% to 0.0030%; O: 0.0010% to 0.0500%; Cu: less than 0.10%; Ni: less than 0.50%; and a remainder including Fe and impurities, in which a product sheet thickness is 0.10 mm to 0.30 mm, an average grain size is 10 ?m to 40 ?m, an iron loss W10/800 is 50 W/Kg or less, a tensile strength is 580 MPa to 700 MPa, and a yield ratio is 0.82 or more.
    Type: Application
    Filed: July 19, 2018
    Publication date: February 6, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiaki NATORI, Kazutoshi TAKEDA, Hiroyoshi YASHIKI, Miho TOMITA, Hiroshi FUJIMURA, Takeaki WAKISAKA, Tesshu MURAKAWA, Takuya MATSUMOTO, Hiroki HORI, Yuuya GOHMOTO, O UYAMA
  • Patent number: 10541071
    Abstract: An electrical steel sheet includes: a specific chemical composition; a crystal grain diameter of 20 ?m to 300 ?m; and a texture satisfying Expression 1, Expression 2, and Expression 3 when the accumulation degree of the (001)[100] orientation is represented as ICube and the accumulation degree of the (011)[100] orientation is represented as IGoss. IGoss+ICube?10.5??Expression 1 IGoss/ICube?0.50??Expression 2 ICube?2.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: January 21, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hirotoshi Tada, Satoshi Kano, Ichiro Tanaka, Hiroyoshi Yashiki
  • Publication number: 20190367746
    Abstract: The present invention relates to an electrical steel sheet and a coating liquid for electrical steel sheets; and the purpose of the present invention is to provide an electrical steel sheet which has more excellent heat resistance, corrosion resistance and appearance without containing chromium, and which exhibits excellent insulating properties even after stress relief annealing performed at temperatures higher than ever before, and a coating liquid for achieving this electrical steel sheet. An electrical steel sheet according to the present invention is mainly composed of a metal phosphate and fine plate-like inorganic compound particles, secondary particles of which have an average particle diameter of from 0.05 ?m to 5 ?m (inclusive) and a specific surface area of 1-80 m2/g, and primary particles of which have an aspect ratio of 50-1,000. The content of the fine plate-like inorganic compound particles is from 0.
    Type: Application
    Filed: March 23, 2018
    Publication date: December 5, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi TAKEDA, Yoshiaki NATORI, Takuya MATSUMOTO, Hiroyoshi YASHIKI
  • Publication number: 20190316239
    Abstract: A non-oriented electrical steel sheet according to an aspect of the present invention contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.2% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, one or more of La, Ce, Pr, and Nd: 0.0005% to 0.0200% in total, Ca: 0.0005% to 0.0100%, Ti: 0.0005% to 0.0100%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which Si?0.5×Mn: 2.0% or more, and Si+0.5×Mn: 3.8% or more.
    Type: Application
    Filed: January 16, 2018
    Publication date: October 17, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI
  • Publication number: 20190316221
    Abstract: A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% to 0.050%, Ti: more than 0% and 0.0050% or less, and a remainder including Fe and impurities, in which Sn+Sb: 0.050% or less, Si?0.5×Mn: 2.0% or more, and an O content in a sheet thickness central portion excluding a surface layer portion which is a range from a front surface and a rear surface to a position of 10 ?m in a depth direction is less than 0.0100%.
    Type: Application
    Filed: January 16, 2018
    Publication date: October 17, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI
  • Publication number: 20190228891
    Abstract: A non-oriented electrical steel sheet has a predetermined chemical composition, and when an average value of Mn concentrations in a range from a surface of a base iron to a position where a depth from the surface of the base iron is 2 ?m is set to [Mn2], and an Mn concentration at a position where a depth from the surface of the base iron is 10 ?m is set to [Mn10], the base iron satisfies the following expression 1. 0.1?[Mn2]/[Mn10]?0.
    Type: Application
    Filed: August 2, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Masaru TAKAHASHI, Kazutoshi TAKEDA, Takuya MATSUMOTO
  • Publication number: 20170233842
    Abstract: A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%?Si-0.5×Mn?2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%?Sn+Sb?0.20%.
    Type: Application
    Filed: August 13, 2015
    Publication date: August 17, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Kenichi MURAKAMI, Nobusato MORISHIGE, Hirotoshi TADA, Yoshiaki NATORI
  • Publication number: 20170098498
    Abstract: An electrical steel sheet includes: a specific chemical composition; a crystal grain diameter of 20 ?m to 300 ?m; and a texture satisfying Expression 1, Expression 2, and Expression 3 when the accumulation degree of the (001)[100] orientation is represented as ICube and the accumulation degree of the (011)[100] orientation is represented as IGoss. IGoss+ICube?10.5??Expression 1 IGoss/ICube?0.50??Expression 2 ICube?2.
    Type: Application
    Filed: June 26, 2015
    Publication date: April 6, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hirotoshi TADA, Satoshi KANO, Ichiro TANAKA, Hiroyoshi YASHIKI
  • Patent number: 8157928
    Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: April 17, 2012
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
  • Patent number: 7922834
    Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: April 12, 2011
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
  • Publication number: 20110042625
    Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.
    Type: Application
    Filed: November 2, 2010
    Publication date: February 24, 2011
    Applicant: SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
  • Publication number: 20090202383
    Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and Vin the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.
    Type: Application
    Filed: December 6, 2005
    Publication date: August 13, 2009
    Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
  • Patent number: 6638368
    Abstract: The non-oriented electrical steel sheet having the following chemical composition: C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: October 28, 2003
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita
  • Publication number: 20020043299
    Abstract: The non-oriented electrical steel sheet having the following chemical composition: C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.
    Type: Application
    Filed: November 2, 2001
    Publication date: April 18, 2002
    Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita
  • Patent number: 6340399
    Abstract: The non-oriented electrical steel sheet having the following chemical composition : C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.
    Type: Grant
    Filed: June 14, 2000
    Date of Patent: January 22, 2002
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita