Patents by Inventor Hirotoshi TADA
Hirotoshi TADA 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: 11866812Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5?Fe0.05)/Fe0.5?0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.Type: GrantFiled: February 7, 2020Date of Patent: January 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Ichiro Tanaka, Takashi Kataoka, Kazutoshi Takeda, Masamitsu Kubota, Hirotoshi Tada
-
Patent number: 11603575Abstract: A grain-oriented electrical steel sheet includes: a silicon steel sheet including Si and Mn; a glass film arranged on a surface of the silicon steel sheet; and an insulation coating arranged on a surface of the glass film, wherein the glass film includes a Mn-containing oxide.Type: GrantFiled: March 19, 2019Date of Patent: March 14, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Takashi Kataoka, Nobusato Morishige, Haruhiko Atsumi, Kazutoshi Takeda, Shin Furutaku, Hirotoshi Tada, Ryosuke Tomioka
-
Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet
Patent number: 11562840Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet having a predetermined chemical composition; a glass coating provided on the surface of the base steel sheet; and a tension-applying insulation coating provided on the surface of the glass coating, in which linear thermal strains having, a predetermined angle (?) with respect to a transverse direction which is a direction orthogonal to a rolling direction are periodically formed on the surface of the tension-applying insulation coating at predetermined intervals along the rolling direction, a full width at half maximum F1 on the linear thermal strain and a full width at half maximum F2 at an intermediate position between the two linear thermal strains adjacent to each other satisfy 0.00<(F1?F2)/F2?0.Type: GrantFiled: March 22, 2019Date of Patent: January 24, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Takashi Kataoka, Ichiro Tanaka, Haruhiko Atsumi, Kazutoshi Takeda, Hirotoshi Tada -
Publication number: 20220243315Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy 0.01<(Fe0.5?Fe0.05)/Fe0.5<0.35. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.Type: ApplicationFiled: February 7, 2020Publication date: August 4, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Ichiro TANAKA, Takashi KATAOKA, Kazutoshi TAKEDA, Masamitsu KUBOTA, Hirotoshi TADA
-
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
-
Publication number: 20220127692Abstract: A grain-oriented electrical steel sheet includes: a steel sheet and optionally an insulation coating formed on the steel sheet, in which, in a case where a heat treatment of performing retention at 800° C. for 2 hours is performed, regarding a time-magnetostriction waveform (t?? waveform) when magnetized to 1.7 T, a peak value of a difference waveform obtained by subtracting the time-magnetostriction waveform after the heat treatment from the time-magnetostriction waveform before the heat treatment is 0.01×10?6 or more and 0.20×10?6 or less, and a difference obtained by subtracting an iron, loss before the heat treatment from an iron loss after the heat treatment is 0.03 W/kg or more and 0.17 W/kg or less.Type: ApplicationFiled: January 28, 2020Publication date: April 28, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Satoshi ARAI, Masataka IWAKI, Masato MIZOKAMI, Hideyuki HAMAMURA, Takeo ARAMAKI, Hirotoshi TADA
-
Publication number: 20220090242Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5?Fe0.05)/Fe0.5?0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.Type: ApplicationFiled: February 7, 2020Publication date: March 24, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Ichiro TANAKA, Takashi KATAOKA, Kazutoshi TAKEDA, Masamitsu KUBOTA, Hirotoshi TADA
-
Publication number: 20220042136Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite-based primary film disposed on a surface of the base steel sheet, and a phosphate-based tension-imparting film containing no chromium, which is disposed on a surface of the primary film. In a case where a Ti content and a S content are respectively expressed as XTi and XS, by mass %, the forsterite-based primary film satisfies Expression (1) and Expression (2). A strain-introduced magnetic domain control is performed on the grain-oriented electrical steel sheet. 0.10?XTi/XS?10.00 ??Expression (1) XTi+XS?0.10 mass %.Type: ApplicationFiled: December 24, 2019Publication date: February 10, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Satoshi ARAI, Hideyuki HAMAMURA, Kazutoshi TAKEDA, Takeo ARAMAKI, Hirotoshi TADA
-
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Publication number: 20210043345Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet having a predetermined chemical composition; a glass coating provided on the surface of the base steel sheet; and a tension-applying insulation coating provided on the surface of the glass coating, in which linear thermal strains having, a predetermined angle (r) with respect to a transverse direction which is a direction orthogonal to a rolling direction are periodically formed on the surface of the tension-applying insulation coating at predetermined intervals along the rolling direction, a full width at half maximum Fl on the linear thermal strain and a full width at half maximum F2 at an intermediate position between the two linear thermal strains adjacent to each other satisfy 0.00<(F1?F2)/F2?0.Type: ApplicationFiled: March 22, 2019Publication date: February 11, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Takashi KATAOKA, Ichiro TANAKA, Haruhiko ATSUMI, Kazutoshi TAKEDA, Hirotoshi TADA -
Publication number: 20200399732Abstract: A grain-oriented electrical steel sheet includes: a silicon steel sheet including Si and Mn; a glass film arranged on a surface of the silicon steel sheet; and an insulation coating arranged on a surface of the glass film, wherein the glass film includes a Mn-containing oxide.Type: ApplicationFiled: March 19, 2019Publication date: December 24, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Takashi KATAOKA, Nobusato MORISHIGE, Haruhiko ATSUMI, Kazutoshi TAKEDA, Shin FURUTAKU, Hirotoshi TADA, Ryosuke TOMIOKA
-
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
-
Patent number: 10669600Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet including: a heating process of heating a slab having a predetermined chemical composition at T1° C. of 1150° C. to 1300° C., retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2° C. of T1?50° C. or lower, heating the slab at T3° C. of 1280° C. to 1450° C., and retaining the slab for 5 minutes to 60 minutes; a hot-rolling process of hot-rolling the slab that is heated to obtain a hot-rolled steel sheet; a cold-rolling process; an intermediate annealing process of performing intermediate annealing with respect to the hot-rolled steel sheet at least one time before the cold-rolling process or before a final pass of the cold-rolling process after interrupting the cold-rolling; an annealing separating agent applying process; and a secondary film applying process. In the cold-rolling process, a retention treatment is performed during a plurality of passes.Type: GrantFiled: April 1, 2016Date of Patent: June 2, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Hirotoshi Tada, Nobusato Morishige, Naoto Masumitsu, Junichi Takaobushi, Shin Furutaku, Masaru Takahashi
-
Patent number: 10604818Abstract: 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: August 13, 2015Date of Patent: March 31, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Kenichi Murakami, Nobusato Morishige, Hirotoshi Tada, Yoshiaki Natori
-
Patent number: 10541071Abstract: 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: GrantFiled: June 26, 2015Date of Patent: January 21, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Hirotoshi Tada, Satoshi Kano, Ichiro Tanaka, Hiroyoshi Yashiki
-
Publication number: 20180282830Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet including: a heating process of heating a slab having a predetermined chemical composition at T1° C. of 1150° C. to 1300° C., retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2° C. of T1?50° C. or lower, heating the slab at T3° C. of 1280° C. to 1450° C., and retaining the slab for 5 minutes to 60 minutes; a hot-rolling process of hot-rolling the slab that is heated to obtain a hot-rolled steel sheet; a cold-rolling process; an intermediate annealing process of performing intermediate annealing with respect to the hot-rolled steel sheet at least one time before the cold-rolling process or before a final pass of the cold-rolling process after interrupting the cold-rolling; an annealing separating agent applying process; and a secondary film applying process. In the cold-rolling process, a retention treatment is performed during a plurality of passes.Type: ApplicationFiled: April 1, 2016Publication date: October 4, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hirotoshi TADA, Nobusato MORISHIGE, Naoto MASUMITSU, Junichi TAKAOBUSHI, Shin FURUTAKU, Masaru TAKAHASHI
-
Publication number: 20170233842Abstract: 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: August 13, 2015Publication date: August 17, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiroyoshi YASHIKI, Kenichi MURAKAMI, Nobusato MORISHIGE, Hirotoshi TADA, Yoshiaki NATORI
-
Publication number: 20170098498Abstract: 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: ApplicationFiled: June 26, 2015Publication date: April 6, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hirotoshi TADA, Satoshi KANO, Ichiro TANAKA, Hiroyoshi YASHIKI