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).
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Publication number: 20210123115Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 ?m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm?1 and a peak intensity IB at 1200 cm?1 satisfy IB/IA?0.010.Type: ApplicationFiled: July 13, 2018Publication date: April 29, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Takashi KATAOKA, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Shunsuke OKUMURA
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Publication number: 20210027922Abstract: A grain oriented electrical steel sheet includes: a base steel sheet; a lower layer which is arranged in contact with the base steel sheet; and an insulation coating which is arranged in contact with the lower layer and which includes a phosphate and a colloidal silica as main components. The base steel sheet includes the predetermined chemical composition and includes a B compound whose major axis length is 1 to 20 ?m and whose number density is 1×10 to 1×106 pieces/mm3. The lower layer is a glass film which includes a forsterite as main component or an intermediate layer includes a silicon oxide as main component.Type: ApplicationFiled: January 24, 2019Publication date: January 28, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Masato YASUDA, Masaru TAKAHASHI, Yoshiyuki USHIGAMI, Shinya YANO
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Publication number: 20200354809Abstract: A grain oriented electrical steel sheet includes: a base steel sheet; a glass film which is arranged in contact with the base steel sheet; and an insulation coating which is arranged in contact with the glass film and which includes a phosphate and a colloidal silica as main components. The base steel sheet includes the predetermined chemical composition. A BN whose average particle size is 50 to 300 nm is included at a predetermined number density in a region which is from an interface between the glass film and the insulation coating till 5 ?m toward the base steel sheet in a depth direction. A B emission intensity obtained inside the glass film is more than a B emission intensity obtained inside the base steel sheet, when a B emission intensity is measured from a surface of the insulation coating by a glow discharge emission spectroscopy.Type: ApplicationFiled: January 24, 2019Publication date: November 12, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Masato YASUDA, Yoshiyuki USHIGAMI, Masaru TAKAHASHI, Shinya YANO
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Publication number: 20200208235Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which a Cr content of the insulation coating is 0.1 at % or more on average, and when viewing a cross section whose cutting direction is parallel to a thickness direction, the insulation coating has a compound layer containing a crystalline phosphide in an area in contact with the intermediate layer.Type: ApplicationFiled: July 13, 2018Publication date: July 2, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Shinji YAMAMOTO, Yoshiyuki USHIGAMI
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Publication number: 20200203047Abstract: A grain-oriented electrical steel sheet includes: a steel sheet; and an amorphous oxide layer that is formed on the steel sheet, in which a glossiness, of a surface is 150% or higher.Type: ApplicationFiled: July 13, 2018Publication date: June 25, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Hiroyasu FUJII, Shuichi NAKAMURA, Takeshi IMAI
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Publication number: 20200190644Abstract: A grain-oriented electrical steel sheet includes a steel sheet and an amorphous oxide layer that is formed on the steel sheet, in which the steel sheet includes, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80% to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0% to 0.80%, N: 0% to 0.012%, P: 0% to 0.50%, Ni: 0% to 1.00%, Sn: 0% to 0.30%, Sb: 0% to 0.30%, and a remainder of Fe and impurities, and a NSIC value of a surface is 4.0% or more, the NSIC value being obtained by measuring an image clearness of the surface using an image clearness measuring device.Type: ApplicationFiled: July 13, 2018Publication date: June 18, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Shinsuke TAKATANI, Kenichi MURAKAMI, Yoshiyuki USHIGAMI, Shunsuke OKUMURA, Shohji NAGANO
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Publication number: 20200123626Abstract: A grain-oriented electrical steel sheet according to an aspect of the present invention includes: a steel sheet 1; an intermediate layer 4 containing Si and O, arranged on the steel sheet; and an insulation coating 3 arranged on the intermediate layer 4, in which the intermediate layer 4 contains a metal phosphide 5, a thickness of the intermediate layer 4 is 4 nm or more, and an abundance of the metal phosphide 5 present is 1% to 30% by cross-sectional area fraction in a cross section of the intermediate layer 4.Type: ApplicationFiled: July 13, 2018Publication date: April 23, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Seiki TAKEBAYASHI, Shuichi NAKAMURA, Hiroyasu FUJII, Yoshiyuki USHIGAMI
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Publication number: 20200123662Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which the insulation coating has a crystalline phosphide-containing layer containing a crystalline phosphide in an area in contact with the intermediate layer when viewing a cross section whose cutting direction is parallel to a thickness direction.Type: ApplicationFiled: July 13, 2018Publication date: April 23, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Seiki TAKEBAYASHI, Shuichi NAKAMURA, Hiroyasu FUJII, Yoshiyuki USHIGAMI, Shinsuke TAKATANI
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Publication number: 20200126698Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which the intermediate layer has a local oxidized area when viewing a cross section whose cutting direction is parallel to a thickness direction, and a thickness of the intermediate layer in an area where the local oxidized area is included is 50 nm or more, and a thickness of the intermediate layer in an area where the local oxidized area is not included is less than 50 nm.Type: ApplicationFiled: July 13, 2018Publication date: April 23, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Seiki TAKEBAYASHI, Shuichi NAKAMURA, Hiroyasu FUJII, Yoshiyuki USHIGAMI, Shinsuke TAKATANI
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Patent number: 10214791Abstract: A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/?m3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750° C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780° C. or higher and performing self annealing.Type: GrantFiled: May 30, 2017Date of Patent: February 26, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori
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Patent number: 10208372Abstract: A grain-oriented electrical steel sheet being a grain-oriented electrical steel sheet containing Si of 0.8 mass % to 7 mass %, Mn of 0.05 mass % to 1 mass %, B of 0.0005 mass % to 0.0080 mass %, each content of Al, C, N, S, and Se of 0.005 mass % or less, and a balance being composed of Fe and inevitable impurities and having a glass coating film made of composite oxide mainly composed of forsterite on the steel sheet surface, in which when glow discharge optical emission spectrometry (GDS) to the surface of a secondary coating film formed on the surface of the glass coating film under a predetermined condition is performed, a peak, of B, in emission intensity having a peak position in emission intensity different from a peak position, of Mg, in emission intensity is obtained and the peak position, of B, in emission intensity from the steel sheet surface is deeper than the peak position, of Mg, in emission intensity.Type: GrantFiled: January 12, 2012Date of Patent: February 19, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Fumiaki Takahashi, Yoshiyuki Ushigami, Kazumi Mizukami, Shuichi Nakamura, Norikazu Fujii, Norihiro Yamamoto, Masahide Urago
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Publication number: 20180119258Abstract: There is provided a non-oriented magnetic steel sheet according to one aspect of the present invention including a predetermined composition, wherein a structure contains 99.0% by area or more of ferrite grains which do not have an unrecrystallized structure, wherein an average crystal grain size of the ferrite grains is 30 ?m to 180 ?m, wherein the ferrite grains contain metal Cu particles of which a number density is 10,000 to 10,000,000 number/?m3 on the inside thereof, wherein the metal Cu particles on the inside of the ferrite grains contain precipitation particles having a 9R structure of which a number density is 2% to 100% with respect to the number density of the metal Cu particles, and precipitation particles having a bee structure of which a number density is 0% to 98% with respect to the number density of the metal Cu particles, and wherein an average grain size of the metal Cu particles on the inside of the ferrite grains is 2.0 nm to 10.0 nm.Type: ApplicationFiled: April 21, 2016Publication date: May 3, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro FUJIKURA, Shinichi MATSUI, Shinichi KANAO, Takeo ARAMAKI, Yoshiyuki USHIGAMI
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Publication number: 20170260598Abstract: A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/?m3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750° C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780° C. or higher and performing self annealing.Type: ApplicationFiled: May 30, 2017Publication date: September 14, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro FUJIKURA, Yoshiyuki USHIGAMI, Tesshu MURAKAWA, Shinichi KANAO, Makoto ATAKE, Takeru ICHIE, Kojiro HORI
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Patent number: 9728312Abstract: A non-oriented electrical steel sheet containing: in mass %, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/?m3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750° C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780° C. or higher and performing self annealing.Type: GrantFiled: November 9, 2012Date of Patent: August 8, 2017Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori
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Patent number: 9721706Abstract: A value of a parameter Q represented by “Q=([Ti]/48+[V]/51+[Zr]/91+[Nb]/93)/([C]/12)” is not less than 0.9 nor more than 1.1, when contents of Ti, V, Zr, Nb, and C (mass %) are represented as [Ti], [V], [Zr], [Nb], and [C] respectively. A matrix of a metal structure is a ferrite phase, and the metal structure does not contain a non-recrystallized structure. An average grain size of ferrite grains constituting the ferrite phase is not less than 30 ?m nor more than 200 ?m. A precipitate containing at least one selected from the group consisting of Ti, V, Zr, and Nb exists with a density of 1 particle/?m3 or more in the ferrite grain. An average grain size of the precipitate is not less than 0.002 ?m nor more than 0.2 ?m.Type: GrantFiled: August 17, 2012Date of Patent: August 1, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori, Shinichi Matsui
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Patent number: 9659693Abstract: A silicon steel sheet (1) containing Si is cold-rolled. Next, a decarburization annealing (3) of the silicon steel sheet (1) is performed so as to cause a primary recrystallization. Next, the silicon steel sheet (1) is coiled so as to obtain a steel sheet coil (31). Next, an annealing (6) of the steel sheet coil (31) is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil (31) is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (31), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet (1) from one end to the other end of the silicon steel sheet (1) along a sheet width direction (2). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet (1) along paths of the laser beams are generated.Type: GrantFiled: May 13, 2014Date of Patent: May 23, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tatsuhiko Sakai, Koji Hirano, Satoshi Arai, Yoshiyuki Ushigami
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Patent number: 9512500Abstract: When contents of Ti, V, Zr, Nb, and C (mass %) are represented as [Ti], [V], [Zr], [Nb], and [C] respectively, a value of a parameter Q represented by “Q=([Ti]/48+[V]/51+[Zr]/91+[Nb]/93)/([C]/12)” is not less than 0.9 nor more than 1.1. A matrix of a metal structure is a ferrite phase, and the metal structure does not include a non-recrystallized structure. An average grain size of ferrite grains constituting the ferrite phase is not less than 10 ?m nor more than 200 ?m. A precipitate containing at least one selected from the group consisting of Ti, V, Zr, and Nb exists with a density of 10 ?m?3 or more in the ferrite grain. An average grain size of the precipitate is not less than 0.002 ?m nor more than 0.2 ?m.Type: GrantFiled: August 16, 2012Date of Patent: December 6, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori, Shinichi Matsui
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Patent number: 9273371Abstract: A predetermined steel containing Te: 0.0005 mass % to 0.0050 mass % is heated to 1320° C. or lower to be subjected to hot rolling, and is subjected to annealing, cold rolling, decarburization annealing, and nitridation annealing, and thereby a decarburized nitrided steel sheet is obtained. Further, an annealing separating agent is applied on the surface of the decarburized nitrided steel sheet and finish annealing is performed, and thereby a glass coating film is formed. The N content of the decarburized nitrided steel sheet is set to 0.0150 mass % to 0.0250 mass % and the relationship of 2×[Te]+[N]?0.0300 mass % is set to be established. Note that [Te] represents the Te content and [N] represents the N content.Type: GrantFiled: March 15, 2011Date of Patent: March 1, 2016Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Kenichi Murakami, Chie Hama, Kazumi Mizukami, Yoshiyuki Ushigami, Shuichi Nakamura
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Patent number: 9175362Abstract: Hot rolling is performed on a steel with a predetermined composition containing Ti: 0.0020 mass % to 0.010 mass % and/or Cu: 0.010 mass % to 0.50 mass % to obtain a hot-rolled steel sheet. Annealing is performed on the hot-rolled steel sheet to obtain an annealed steel sheet. Cold rolling is performed on the annealed steel sheet to obtain a cold-rolled steel sheet. Decarburization annealing and nitridation annealing are performed on the cold-rolled steel sheet to obtain a decarburized nitrided steel sheet. Then, finish annealing is performed on the decarburized nitrided steel sheet. When obtaining the decarburized nitrided steel sheet, heating on the cold-rolled steel sheet is started in a decarburizing and nitriding atmosphere, then first annealing is performed at a first temperature within a predetermined range, and then second annealing is performed at a second temperature within a predetermined range.Type: GrantFiled: February 18, 2011Date of Patent: November 3, 2015Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kenichi Murakami, Yoshiyuki Ushigami
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Publication number: 20150170812Abstract: A slab having a desired composition containing Sn: 0.02% to 0.20% and P: 0.010% to 0.080% is used. A finishing temperature of hot rolling is 950° C. or lower, hot-rolled sheet annealing is performed at 800° C. to 1200° C., a cooling rate from 750° C. to 300° C. in the hot-rolled sheet annealing is 10° C./second to 300° C./second, and a reduction ratio of cold rolling is 85% or more. A nitridation treatment in which an N content of a decarburization-annealed steel sheet is increased is performed between beginning of decarburization annealing and occurrence of secondary recrystallization in finish annealing.Type: ApplicationFiled: July 20, 2012Publication date: June 18, 2015Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kenichi Murakami, Yoshiyuki Ushigami, Fumiaki Takahashi