Patents by Inventor Shinji Koseki

Shinji Koseki 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: 10526673
    Abstract: A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se?0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300° C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001}<250>, {111}<112> and {001}<100> in a central layer in a thickness direction are S, M and C, respectively.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: January 7, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Tomoyuki Okubo, Tadashi Nakanishi, Yoshihiko Oda, Shinji Koseki
  • Patent number: 10102951
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low anisotropy contains C: not more than 0.01 mass %, Si: 1-4 mass %, Mn: 0.05-3 mass %, P: 0.03-0.2 mass %, S: not more than 0.01 mass %, Al: not more than 0.004 mass %, N: not more than 0.005 mass %, As: not more than 0.003 mass %, and preferably further contains one or two of Sb: 0.001-0.1 mass % and Sn: 0.001-0.1 mass % or further contains one or two of Ca: 0.001-0.005 mass % and Mg: 0.001-0.005 mass %.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: October 16, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshihiko Oda, Hiroaki Toda, Shinji Koseki, Tatsuhiko Hiratani, Tadashi Nakanishi, Tomoyuki Okubo
  • Patent number: 10006109
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss at not only a commercial frequency but also a high frequency zone, which has a chemical composition including C: not more than 0.0050 mass %, Si: more than 1.5 mass % but not more than 5.0 mass %, Mn: not more than 0.10 mass %, sol. Al: not more than 0.0050 mass, P: more than 0.040 mass % but not more than 0.2 mass %, S: not more than 0.0050 mass %, N: not more than 0.0040 mass % and Ca: 0.001-0.01 mass % and the remainder being Fe and inevitable impurities and a compositional ratio of CaO in oxide-based inclusions existing in a steel sheet of not less than 0.4 and/or a compositional ratio of Al2O3 of not less than 0.3, and a hot rolled steel sheet used as a raw steel material thereof.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: June 26, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Tadashi Nakanishi, Shinji Koseki, Yoshihiko Oda, Hiroaki Toda
  • Publication number: 20170260600
    Abstract: A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se?0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300° C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001}<250>, {111}<112> and {001}<100> in a central layer in a thickness direction are S, M and C, respectively.
    Type: Application
    Filed: June 1, 2015
    Publication date: September 14, 2017
    Applicant: JFE STEEL CORPORATION
    Inventors: Tomoyuki OKUBO, Tadashi NAKANISHI, Yoshihiko ODA, Shinji KOSEKI
  • Publication number: 20170229222
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss includes C: not more than 0.01 mass %, Si: 1.3-5.0 mass %, Mn: 0.001-3 mass %, sol. Al: not more than 0.004 mass %, P: 0.03-0.20 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, Ti: more than 0.0020 mass % but not more than 0.1 mass %, and further contains one or more selected from Sn: 0.001-0.1 mass %, Sb: 0.001-0.1 mass %, Ca: 0.001-0.02 mass % and Mg: 0.001-0.02 mass % as required.
    Type: Application
    Filed: August 6, 2015
    Publication date: August 10, 2017
    Applicant: JFE STEEL CORPORATION
    Inventors: Tadashi Nakanishi, Shinji Koseki, Yoshihiko Oda, Tomoyuki Okubo
  • Patent number: 9605331
    Abstract: A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 28, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Seiko Nara, Toshio Ishii, Shinji Koseki, Katsuhiro Takebayashi, Naoki Nakata, Hiroyuki Fukuda, Eitaro Shidara, Takashi Wada
  • Publication number: 20160351308
    Abstract: A non-oriented electrical steel sheet has a high magnetic flux density and a low iron loss contains in terms of mass %, C: not more than 0.010%, Si: 1-4%, Mn: 0.05-3%, Al: not more than 0.004%, N: not more than 0.005%, P: 0.03-0.20%, S: not more than 0.01% and Se: not more than 0.002% or contains in terms of mass, C: not more than 0.01%, Si: 1-4%, Mn: 0.05-3%, Al: not more than 0.004%, N: not more than 0.005%, P: 0.03-0.20%, S: not more than 0.01%, Se: not more than 0.003% and further contains one or two selected from Sn: 0.001-0.1 mass % and Sb: 0.001-0.1 mass %.
    Type: Application
    Filed: January 8, 2015
    Publication date: December 1, 2016
    Inventors: Yoshihiko Oda, Tadashi Nakanishi, Shinji Koseki, Tomoyuki Okubo
  • Publication number: 20160203895
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss at not only a commercial frequency but also a high frequency zone, which has a chemical composition including C: not more than 0.0050 mass %, Si: more than 1.5 mass % but not more than 5.0 mass %, Mn: not more than 0.10 mass %, sol. Al: not more than 0.0050 mass, P: more than 0.040 mass % but not more than 0.2 mass %, S: not more than 0.0050 mass %, N: not more than 0.0040 mass % and Ca: 0.001-0.01 mass % and the remainder being Fe and inevitable impurities and a compositional ratio of CaO in oxide-based inclusions existing in a steel sheet of not less than 0.4 and/or a compositional ratio of Al2O3 of not less than 0.3, and a hot rolled steel sheet used as a raw steel material thereof.
    Type: Application
    Filed: August 11, 2014
    Publication date: July 14, 2016
    Applicant: JFE STEEL CORPORATION
    Inventors: Tadashi NAKANISHI, Shinji KOSEKI, Yoshihiko ODA, Hiroaki TODA
  • Publication number: 20160203896
    Abstract: A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.010 mass %, Si: 1.0-7.0 mass %, Mn: 0.001-3.0 mass %, sol. Al: 0.0001-3.5 mass %, P: 0.01-0.2 mass %, S: not more than 0.010 mass %, N: not more than 0.010 mass % and the remainder being Fe and inevitable impurities, wherein a ratio (P120/Fe700) of a peak-peak height P120 of P near to an electronic energy of 120 eV to a peak-peak height Fe700 of Fe near to an electronic energy of 700 eV in an Auger differential spectrum obtained by analyzing a broken surface of a grain boundary through Auger electron spectroscopy is not less than 0.1 and a sheet thickness is 0.10-0.50 mm, and a motor using such a non-oriented electrical steel sheet as an iron core.
    Type: Application
    Filed: August 11, 2014
    Publication date: July 14, 2016
    Applicant: JFE STEEL CORPORATION
    Inventors: Tadashi NAKANISHI, Shinji KOSEKI, Yoshihiko ODA, Hiroaki TODA
  • Publication number: 20160076125
    Abstract: A non-oriented electrical steel sheet has a chemical composition that includes C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% as mass % and the remainder being Fe and inevitable impurities or a chemical composition containing C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% and further one or two of Ca: 0.0005-0.005% and Mg: 0.0002-0.005%, and is stably excellent in the high-frequency iron loss property even if a great amount of Mn is included.
    Type: Application
    Filed: March 12, 2014
    Publication date: March 17, 2016
    Inventors: Shinji Koseki, Yoshihiko Oda, Hiroaki Toda, Tatsuhiko Hiratani, Tadashi Nakanishi
  • Publication number: 20160042850
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low anisotropy contains C: not more than 0.01 mass %, Si: 1-4 mass %, Mn: 0.05-3 mass %, P: 0.03-0.2 mass %, S: not more than 0.01 mass %, Al: not more than 0.004 mass %, N: not more than 0.005 mass %, As: not more than 0.003 mass %, and preferably further contains one or two of Sb: 0.001-0.1 mass % and Sn: 0.001-0.1 mass % or further contains one or two of Ca: 0.001-0.005 mass % and Mg: 0.001-0.005 mass %.
    Type: Application
    Filed: March 11, 2014
    Publication date: February 11, 2016
    Applicant: JFE STEEL CORPORATION
    Inventors: Yoshihiko Oda, Hiroaki Toda, Shinji Koseki, Tatsuhiko Hiratani, Tadashi Nakanishi, Tomoyuki Okubo
  • Publication number: 20160020007
    Abstract: A non-oriented electrical steel sheet has a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.001 mass % and the remainder being Fe and inevitable impurities or a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.0020 mass % and further one or two of Ca: 0.0005-0.007 mass % and Mg: 0.0002-0.005 mass %, and has a stable and excellent high-frequency iron loss property even when Mn content is high.
    Type: Application
    Filed: March 12, 2014
    Publication date: January 21, 2016
    Inventors: Yoshihiko Oda, Hiroaki Toda, Shinji Koseki, Tatsuhiko Hiratani, Tadashi Nakanishi
  • Publication number: 20150001769
    Abstract: A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.
    Type: Application
    Filed: December 27, 2012
    Publication date: January 1, 2015
    Inventors: Seiko Nara, Toshio Ishii, Shinji Koseki, Katsuhiro Takebayashi, Naoki Nakata, Hiroyuki Fukuda, Eitaro Shidara, Takashi Wada