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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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
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Publication number: 20200040423Abstract: 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: ApplicationFiled: July 19, 2018Publication date: February 6, 2020Applicant: 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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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
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Publication number: 20190367746Abstract: The present invention relates to an electrical steel sheet and a coating liquid for electrical steel sheets; and the purpose of the present invention is to provide an electrical steel sheet which has more excellent heat resistance, corrosion resistance and appearance without containing chromium, and which exhibits excellent insulating properties even after stress relief annealing performed at temperatures higher than ever before, and a coating liquid for achieving this electrical steel sheet. An electrical steel sheet according to the present invention is mainly composed of a metal phosphate and fine plate-like inorganic compound particles, secondary particles of which have an average particle diameter of from 0.05 ?m to 5 ?m (inclusive) and a specific surface area of 1-80 m2/g, and primary particles of which have an aspect ratio of 50-1,000. The content of the fine plate-like inorganic compound particles is from 0.Type: ApplicationFiled: March 23, 2018Publication date: December 5, 2019Applicant: NIPPON STEEL CORPORATIONInventors: Kazutoshi TAKEDA, Yoshiaki NATORI, Takuya MATSUMOTO, Hiroyoshi YASHIKI
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NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET
Publication number: 20190316221Abstract: 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: ApplicationFiled: January 16, 2018Publication date: October 17, 2019Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI -
Publication number: 20190316239Abstract: 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: ApplicationFiled: January 16, 2018Publication date: October 17, 2019Applicant: NIPPON STEEL CORPORATIONInventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI
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Publication number: 20190228891Abstract: 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: ApplicationFiled: August 2, 2017Publication date: July 25, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Masaru TAKAHASHI, Kazutoshi TAKEDA, Takuya MATSUMOTO
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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
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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
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Patent number: 8157928Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.Type: GrantFiled: November 2, 2010Date of Patent: April 17, 2012Assignee: Sumitomo Metal Industries, Ltd.Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
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Patent number: 7922834Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.Type: GrantFiled: December 6, 2005Date of Patent: April 12, 2011Assignee: Sumitomo Metal Industries, Ltd.Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
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Publication number: 20110042625Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and V in the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.Type: ApplicationFiled: November 2, 2010Publication date: February 24, 2011Applicant: SUMITOMO METAL INDUSTRIES, LTD.Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
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Publication number: 20090202383Abstract: A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and generators which rotate at a high speed, and a method for producing the same. To achieve the object, the present invention provides a non-oriented electrical steel sheet comprising in % by mass: 0.06% or less of C; 3.5% or less of Si; from 0.05% or more to 3.0% or less of Mn; 2.5% or less of Al; 0.30% or less of P; 0.04% or less of S; 0.02% or less of N; at least one element selected from the group consisting of Nb, Ti, Zr and Vin the predetermined range; and a balance consisting of Fe and impurities; and having a recrystallized fraction being less than 90%.Type: ApplicationFiled: December 6, 2005Publication date: August 13, 2009Inventors: Ichirou Tanaka, Hiroshi Fujimura, Hirokatsu Nitomi, Hiroyoshi Yashiki, Kouji Nishida, Hiroki Takamaru
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Patent number: 6638368Abstract: The non-oriented electrical steel sheet having the following chemical composition: C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.Type: GrantFiled: November 2, 2001Date of Patent: October 28, 2003Assignee: Sumitomo Metal Industries, Ltd.Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita
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Publication number: 20020043299Abstract: The non-oriented electrical steel sheet having the following chemical composition: C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.Type: ApplicationFiled: November 2, 2001Publication date: April 18, 2002Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita
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Patent number: 6340399Abstract: The non-oriented electrical steel sheet having the following chemical composition : C: 0.01% or less, Si: 2.5% or less, Mn: 2% or less, Al: 1 to 5%, Si+Al+0.5×Mn: 2.5 to 5%, with a sheet thickness of 0.1 to 0.4 mm, an average grain diameter of 50 to 180 &mgr;m and a Vickers hardness of 130 to 210. The steel sheet is excellent in workability such as punchability and interlocking performance for forming it into cores for motors and also has a lower iron loss and higher magnetic flux density, and thus when used as a core in a motor, achieves the high a motor efficiency. The steel sheet is particularly suitable as a material for cores in inverter-controlled motors.Type: GrantFiled: June 14, 2000Date of Patent: January 22, 2002Assignee: Sumitomo Metal Industries, Ltd.Inventors: Ichiro Tanaka, Hiroyoshi Yashiki, Mitsuyo Maeda, Taisei Nakayama, Noriyuki Honjou, Shinsuke Mita
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Patent number: 5425820Abstract: An oriented magnetic steel sheet with a very low core loss and a process for manufacturing it at a lower cost are disclosed. The steel sheet consists essentially of Si: greater than 3.0% and at most 6.0%, Mn: greater than 2.0% and at moat 8.0%, sol. Al: 0.003-0.015%, with Si (%)-0.5.times.Mn (%).ltoreq.2.0 and the balance being Fe and incidental impurities, The amounts of C, N, and S as impurities are respectively at most 0.005%, at most 0.006%, and at most 0.01%. This steel sheet can be produced from a slab containing up to 0.01% C., up to 0.01% S and 0.001-0.010% N by (i) hot rolling the slab to obtain a hot-rolled steel sheet, (ii) cold rolling the hot-rolled steel sheet, as hot-rolled or after being subsequently annealed, one or more times with an intermediate annealing performed between successive stages of cold rolling to prepare a cold-rolled sheet, (iii) causing primary recrystallization by continuous annealing of the cold-rolled sheet, and (iv) finish annealing the continuously annealed steel sheet.Type: GrantFiled: January 8, 1993Date of Patent: June 20, 1995Assignee: Sumitomo Metal Industries, Ltd.Inventors: Hiroyoshi Yashiki, Teruo Kaneko, Takashi Tanaka
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Patent number: 5250123Abstract: An oriented silicon steel sheet with a very low core loss and a process for producing it at a lower cost are disclosed. The steel sheet consists essentially of Si: 1.5-3.0%, Mn: 1.0-3.0%, sol. Al: 0.003-0.015%, with Si (%)-0.5.times.Mn (%).ltoreq.2.0 and the balance being Fe and incidental impurities, in which the amount of C and N as impurities is not more than 0.0020%, with S being not more than 0.01%. This steel sheet can be produced from a slab containing up to 0.01% C and 0.001-0.010% N through hot rolling, cold rolling, primary and secondary recrystallization, and then decarburization.Type: GrantFiled: March 13, 1992Date of Patent: October 5, 1993Assignee: Sumitomo Metal Industries, Ltd.Inventors: Hiroyoshi Yashiki, Teruo Kaneko