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).
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Publication number: 20240084415Abstract: This non-oriented electrical steel sheet includes a base material having a chemical composition including Si: 3.7 to 4.8%, wherein a recrystallization rate is less than 100% in terms of an area fraction, the following Formula (i) and Formula (ii) are satisfied, and the tensile strength is more than 700 MPa. 4.3?Si+sol. Al+0.5×Mn?4.9??(i) (B50(0°)+2×B50(45°)+B50(90°))/4?1.Type: ApplicationFiled: March 31, 2022Publication date: March 14, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Ichiro TANAKA, Yoshihiro ARITA, Hiroki HORI, Wataru OHASHI
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Publication number: 20240035131Abstract: This non-oriented electrical steel sheet has a predetermined chemical composition, and in which the tensile strength is 580 MPa or more, the average grain size of a recrystallization part of base iron is 50 ?m or less, and in inclusions having an equivalent circle diameter of 1 ?m or more and an S content of 5 mass % or more contained in base iron, the number of inclusions having a Mg content of more than 5 mass % and a Mn content of 5 mass % or more is 5 times or more the number of inclusions having a Mg content of 5 mass % or less and a Mn content of 5 mass % or more.Type: ApplicationFiled: March 30, 2022Publication date: February 1, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Minako FUKUCHI, Kazutoshi TAKEDA
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Publication number: 20240039347Abstract: This non-oriented electrical steel sheet contains a base material having a chemical composition including, in mass %, Si: 3.2 to 4.5%, wherein the tensile strength is 550 MPa or more, and a ratio (P120B/Fe700B)B between a peak-to-peak height Fe700B of Fe at 700 eV and a peak-to-peak height P120B of P at 120 eV when crystal grain boundaries are measured through Auger electron spectroscopy is not more than twice a ratio (P120i/Fe700i)i between a peak-to-peak height Fe700i of Fe at 700 eV and a peak-to-peak height P120i of P at 120 eV when the inside of crystals is measured through Auger electron spectroscopy.Type: ApplicationFiled: March 30, 2022Publication date: February 1, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Minako FUKUCHI, Kazutoshi TAKEDA
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Patent number: 11866797Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn?4.3], and an average grain size of the base metal is more than 40 ?m and 120 ?m or less.Type: GrantFiled: November 1, 2019Date of Patent: January 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Miho Tomita, Kazutoshi Takeda, Takuya Matsumoto
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Publication number: 20230137498Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass %, C: 0.0010 to 0.0040%, Si: 3.5 to 4.9%, Mn: 0.05 to 0.20%, Al: 0.05 to 0.45%, P: 0.030% or less, S: 0.0030% or less, N: 0.0030% or less, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, and satisfying [4.0?Si+Al?5.0], in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 ?m in a depth direction of the base metal.Type: ApplicationFiled: April 16, 2021Publication date: May 4, 2023Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20230139246Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass%, C: 0.0010 to 0.0040%, Si: 4.0 to 5.0%, Mn: 0.20% or less Al: 0.010% or more and less than 0.050%, P: 0.030% or less, S: 0.0030% or less, N: 0.0005 to 0.0030%, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 µm in a depth direction of the base metal.Type: ApplicationFiled: April 16, 2021Publication date: May 4, 2023Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20230104017Abstract: A chemical composition of a base metal of a non-oriented electrical steel sheet contains, by mass %, C: 0.0050% or less, Si: 3.8% to 5.0%, Mn: exceeding 0.2% and less than 2.0%, P: 0.030% or less, S: 0.0030% or less, Al: 0.005% or more and less than 0.050%, N: 0.0005% to 0.0030%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, a remainder: Fe and impurities. [Si+0.5×Mn?4.3] is satisfied and the average grain size of the base metal is in a range of 10 to 80 ?m.Type: ApplicationFiled: April 2, 2020Publication date: April 6, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Patent number: 11499059Abstract: An electrical steel sheet is described, which has an insulating coating on its surface. The insulating coating is free of chromium and comprises plate-like particles of inorganic compound and a metal phosphate. The plate-like particles of inorganic compound are in the form of secondary particles, which are formed by aggregating primary particles, and present in an amount of not less than 0.1 parts by mass and not greater than 20 parts by mass, with respect to 100 parts by mass of the metal phosphate. The secondary particles have an average particle diameter of no less than 0.05 ?m and no greater than 5 ?m, and have a specific surface area of 1 to 80 m2/g. The primary particles have an aspect ratio of 50 to 1000. The electrical steel sheet has excellent heat resistance, corrosion resistance, appearance, and insulating properties.Type: GrantFiled: March 23, 2018Date of Patent: November 15, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Kazutoshi Takeda, Yoshiaki Natori, Takuya Matsumoto, Hiroyoshi Yashiki
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Patent number: 11377705Abstract: 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: GrantFiled: February 18, 2020Date of Patent: July 5, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Kenichi Murakami, Nobusato Morishige, Hirotoshi Tada, Yoshiaki Natori
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Publication number: 20220186336Abstract: This electrical steel sheet contains, as a chemical composition, by mass %, C: 0.0035% or less, Si: 2.00% to 3.50%, Mn: 2.00% to 5.00%, P: 0.050% or less, S: 0.0070% or less, Al: 0.15% or less, N: 0.0030% or less, Ni: 0% to 1.00%, Cu: 0% to 0.10%, and a remainder: Fe and impurities, in which an X-ray random intensity ratio in a {100} <011> crystal orientation on a sheet surface is 15.0 to 50.0, and magnetic flux densities in 0°, 22.5°, and 45° directions from a rolling direction each satisfy [1.005×(B50 (0°)+B50 (45°))/2?B50 (22.5°)].Type: ApplicationFiled: April 1, 2020Publication date: June 16, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Miho TOMITA, Yoshiaki NATORI, Hiroyoshi YASHIKI, Hiroshi FUJIMURA
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Patent number: 11295881Abstract: 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: GrantFiled: August 2, 2017Date of Patent: April 5, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiaki Natori, Hiroyoshi Yashiki, Masaru Takahashi, Kazutoshi Takeda, Takuya Matsumoto
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Patent number: 11279985Abstract: 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: GrantFiled: July 19, 2018Date of Patent: March 22, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiaki Natori, Kazutoshi Takeda, Hiroyoshi Yashiki, Miho Tomita, Hiroshi Fujimura, Takeaki Wakisaka, Tesshu Murakawa, Takuya Matsumoto, Hiroki Hori, Yuuya Gohmoto, O Uyama
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Publication number: 20220021248Abstract: A non-oriented electrical steel sheet has a chemical composition containing, in terms of % by mass, C: 0.0015% or less and Si: 2.5 to 4.0% and having an average crystal grain size of 10 to 40 ?m, and an internal oxidation layer having a thickness of 0.5 to 3.0 ?m present in a sheet thickness direction of a surface thereof.Type: ApplicationFiled: January 17, 2020Publication date: January 20, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Miho TOMITA
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Publication number: 20210343458Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+sol. Al+0.5×Mn?4.3], and an average grain size of the base metal is more than 40 ?m and 120 ?m or less.Type: ApplicationFiled: November 1, 2019Publication date: November 4, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Publication number: 20210301363Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn?4.3], and an average grain size of the base metal is more than 40 ?m and 120 ?m or less.Type: ApplicationFiled: November 1, 2019Publication date: September 30, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Miho TOMITA, Kazutoshi TAKEDA, Takuya MATSUMOTO
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Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 11124854Abstract: 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: GrantFiled: March 7, 2018Date of Patent: September 21, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Fujimura, Takeru Ichie, Yoshiaki Natori, Hiroyoshi Yashiki -
Patent number: 11053574Abstract: 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: GrantFiled: January 16, 2018Date of Patent: July 6, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
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Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 11021771Abstract: 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: GrantFiled: January 16, 2018Date of Patent: June 1, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki -
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET
Publication number: 20200232059Abstract: 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: ApplicationFiled: March 7, 2018Publication date: July 23, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Hiroshi FUJIMURA, Takeru ICHIE, Yoshiaki NATORI, Hiroyoshi YASHIKI -
Publication number: 20200181725Abstract: 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: ApplicationFiled: February 18, 2020Publication date: June 11, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Kenichi MURAKAMI, Nobusato MORISHIGE, Hirotoshi TADA, Yoshiaki NATORI