Patents by Inventor Yoshiyuki Ushigami

Yoshiyuki Ushigami 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).

  • Publication number: 20220119905
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 21, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Shohji NAGANO, Shunsuke OKUMURA
  • Publication number: 20220119958
    Abstract: This grain-oriented electrical steel sheet includes a steel sheet, an insulation coating disposed on the steel sheet, and a spinel present at a part on the steel sheet at an interface between the steel sheet and the insulation coating by being fitted into the insulation coating, in which an amount of the spinel is 5 to 50 mg/m2 per unit area of a surface of the steel sheet.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 21, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyasu FUJII, Seiki TAKEBAYASHI, Yoshiyuki USHIGAMI, Takashi KATAOKA, Shunsuke OKUMURA
  • Publication number: 20220119907
    Abstract: The method for manufacturing a grain-oriented electrical steel sheet is a method for manufacturing a grain-oriented electrical steel sheet including a strain region forming process of irradiating the grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4) with an electron beam and forming a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1) on a surface of the base steel sheet (1), wherein, in the strain region forming process, a temperature of a central portion of the strain region (D) in the rolling direction of the base steel sheet (1) and an extension direction of the strain region (D) is heated to 800° C. or higher and 2000° C. or lower.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 21, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Satoshi ARAI, Yoshiyuki USHIGAMI, Hideyuki HAMAMURA, Shinji YAMAMOTO, Shunsuke OKUMURA
  • Publication number: 20220112573
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 14, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Shunsuke OKUMURA, Shohji NAGANO
  • Publication number: 20220106658
    Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 7, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiyuki USHIGAMI, Shinji YAMAMOTO, Fumiaki TAKAHASHI, Hideyuki HAMAMURA, Shinsuke TAKATANI, Masaru TAKAHASHI
  • Publication number: 20220106661
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where chemical-polished is conducted to control average roughness Ra, and an insulation coating forming process where insulation coating forming solution in which crystalline phosphide is included is applied.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 7, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220098689
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where chemical-polished is conducted to control average roughness Ra, and an insulation coating forming process where insulation coating forming solution in which crystalline phosphide is included is applied.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220102035
    Abstract: A grain-oriented electrical steel sheet according to an aspect of the present invention includes an underlying steel sheet and a tension-insulation coating arranged on the surface of the underlying steel sheet, and a ten-point average roughness RzL in an L direction obtained when the tension-insulation coating is removed from the grain-oriented electrical steel sheet with an alkaline solution, and then the surface of the underlying steel sheet is measured in a rolling direction is 6.0 ?m or less.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi NAKAMURA, Yoshiyuki USHIGAMI, Hiroyasu FUJII
  • Publication number: 20220098693
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor and then pickling is conducted, a smoothing process where mixed gas and temperature are controlled for annealing, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220098690
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and MCl in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a mass ratio of phosphoric acid and metal compound in insulation coating forming solution is controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220098694
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing. The silicon steel material contains: in terms of mass %, Si: 0.8 to 7.0%; C: 0.085% or less; acid-soluble Al: 0.010 to 0.065%; N: 0.004 to 0.012%; Mn: 1.00% or less; S: 0.050% or less; a total of 0.01 to 0.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Norikazu FUJII
  • Publication number: 20220098691
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: heating a steel slab having a prescribed chemical composition to lower than 1250° C. and subjecting the steel slab to hot rolling to obtain a hot-rolled steel sheet; performing hot-band annealing on the hot-rolled steel sheet; pickling the hot-rolled steel sheet which has been subjected to the hot-band annealing; subjecting the hot-rolled steel sheet which has been subjected to the pickling to cold rolling to obtain a cold-rolled steel sheet having a final sheet thickness d of 0.15 to 0.23 mm; performing a decarburization nitriding treatment including decarburization annealing and nitriding on the cold-rolled steel sheet; performing final annealing on the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment; and then applying a coating liquid for insulation coating formation to the cold-rolled steel sheet which has been subjected to the final annealing and baking the cold-rolled steel sheet.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masato YASUDA, Masaru TAKAHASHI, Yoshiyuki USHIGAMI, Shohji NAGANO, Yoichi ZAIZEN
  • Publication number: 20220090267
    Abstract: A grain-oriented electrical steel sheet includes a base steel sheet which contains Si and Mn, an intermediate layer which is disposed on a surface of the base steel sheet and contains a silicon oxide as a main component, and an insulation coating which is disposed on a surface of the intermediate layer. A final-annealed film is not substantially present on a surface of the base steel sheet. In a surface layer region of grain-oriented electrical steel sheet, a Mn-depletion layer having a valley portion of a Mn content in which a Mn content is lower than an average Mn content of the base steel sheet in a region deeper than the surface layer region is provided, and a Mn-rich layer having a peak portion of a Mn content in which a Mn content is higher than that in the valley portion of the Mn content is provided in a region closer to a surface of the insulation coating than the Mn-depletion layer.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinji YAMAMOTO, Yoshiyuki USHIGAMI, Shinsuke TAKATANI, Shuichi NAKAMURA
  • Publication number: 20220090227
    Abstract: The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M2P4O13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiyuki USHIGAMI, Shinji YAMAMOTO, Hideyuki HAMAMURA, Takashi KATAOKA, Shunsuke OKUMURA
  • Publication number: 20220090246
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and MCl in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas without hydrogen, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220090225
    Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, an intermediate layer that is formed on a surface of the base steel sheet and mainly contains silicon oxide, and an insulation coating that is formed on the surface of the intermediate layer. A number density of the oxide particles in a region from the surface of the base steel sheet to a depth of 10 ?m toward an inside of the base steel sheet is 0.020 oxide particles/?m2 or less. In the grain-oriented electrical steel sheet, an area rate of an intermediate layer-remaining region n which the intermediate layer does not peel off but remains in a region in which the insulation coating peels off after a bend test performed using a mandrel according to JIS K 5600-5-1 (1999) is 20% or more.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinji YAMAMOTO, Yoshiyuki USHIGAMI, Shinsuke TAKATANI
  • Publication number: 20220081744
    Abstract: Provided is a grain-oriented electrical steel sheet including a base steel sheet, an intermediate layer which is disposed in contact with the base steel sheet and mainly includes silicon oxide, and an insulation coating which is disposed in contact with the intermediate layer and mainly includes phosphate and colloidal silica, in which the base steel sheet contains predetermined chemical composition, BN having an average particle size of 50 to 300 nm is present, when an emission intensity of B is measured using glow discharge emission analysis, predetermined conditions are satisfied, and a ratio of a major axis to a minor axis of BN is 1.5 or less.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 17, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masato YASUDA, Yoshihiro ARITA, Masaru TAKAHASHI, Yoshiyuki USHIGAMI, Shohji NAGANO
  • Publication number: 20220081749
    Abstract: This manufacturing method of a grain-oriented electrical steel sheet is a manufacturing method of a grain-oriented electrical steel sheet having no forsterite film, in which in a decarburization annealing process, a cold-rolled steel sheet is (i-1) heated at an average heating rate (HR1) of 40 to 500° C./sec in a temperature range of 550° C. or higher and lower than 720° C., (i-2) heated at an average heating rate (HR2), which is 5 to 50° C./sec, in a temperature range of 720° C. to T1° C. (770° C.?T1 (° C.)?900° C.), and (ii) retained at the temperature of T1° C. for 50 to 1000 seconds to make an amount of C 25 ppm or less in an atmosphere of an oxygen partial pressure (P1) which is 0.0010 to 0.20.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 17, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Takashi KATAOKA, Yoshiyuki USHIGAMI, Kenichi MURAKAMI, Hiroyasu FUJII, Shingo OKADA, Seiki TAKEBAYASHI
  • Publication number: 20220081746
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled and pickling is conducted after decreasing temperature, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, an annealing separator removing process where water-washing is conducted using solution with inhibitor, and an insulation coating forming process where a mass ratio of phosphoric acid and metal compound in insulation coating forming solution is controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 17, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI
  • Publication number: 20220081747
    Abstract: A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, a final annealing process where hydrogen in mixed gas atmosphere is controlled to 50 volume % or more, an annealing separator removing process where water-washing is conducted using solution with inhibitor, a smoothing process where mixed gas and temperature are controlled for annealing, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 17, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI