Patents by Inventor Kazutoshi Takeda

Kazutoshi Takeda 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: 11072861
    Abstract: A grain-oriented electrical steel sheet according to one embodiment of the present invention includes a steel sheet and an insulation coating, in which the insulation coating contains a first metal phosphate, which is a metal phosphate of one or two more metals selected from Al, Fe, Mg, Mn, Ni, and Zn; a second metal phosphate, which is a metal phosphate of one or two more metals selected from Co, Mo, V, W, and Zr; and colloidal silica, the insulation coating does not contain chromate, and an elution amount of phosphoric acid of the insulation coating as determined by boiling the grain-oriented electrical steel sheet in a boiled pure water for 10 minutes, then measuring an elution amount of phosphoric acid into the pure water, and dividing the amount of phosphoric acid by the area of the insulation coating of the boiled grain-oriented electrical steel sheet is 30 mg/m2 or less.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: July 27, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Fumikazu Andou, Tomoya Suenaga, Shuichi Yamazaki, Masaru Takahashi
  • Patent number: 11053574
    Abstract: 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: Grant
    Filed: January 16, 2018
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Patent number: 11021771
    Abstract: 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: Grant
    Filed: January 16, 2018
    Date of Patent: June 1, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Publication number: 20210054489
    Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet including, as a chemical composition, by mass %, C: 0.010% or less, Si: 2.50% to 4.00%, Mn: 0.050% to 1.000%, S+Se: 0.005% or less in total, Sol. Al: 0.005% or less, N: 0.005% or less, Bi+Te+Pb: 0% to 0.0300% in total, Sb: 0% to 0.50%, Sn: 0% to 0.50%, Cr: 0% to 0.50%, Cu: 0% to 1.0%, and a remainder of Fe and impurities; and a tension-applying insulation coating provided on a surface of the base steel sheet, in which, on the surface of the base steel sheet, an arithmetic average roughness Ra along a rolling 90° direction that is a direction perpendicular to a rolling direction is 0.60 ?m or less, and when a cross section of the base steel sheet is observed along the rolling 90° direction, recessed parts having a depth of 0.1 ?m or more and 2.0 ?m or less are present on the surface of the base steel sheet in 1.0/100 ?m or more and 6.0/100 ?m or less.
    Type: Application
    Filed: March 22, 2019
    Publication date: February 25, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Ichiro TANAKA, Takashi KATAOKA, Noriyoshi KUBOTA, Kazutoshi TAKEDA
  • Publication number: 20210043345
    Abstract: 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: Application
    Filed: March 22, 2019
    Publication date: February 11, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi KATAOKA, Ichiro TANAKA, Haruhiko ATSUMI, Kazutoshi TAKEDA, Hirotoshi TADA
  • Publication number: 20210002738
    Abstract: In the present invention, there is provided a coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet, including: a solvent; and one or two more layered clay mineral powders having a specific surface area of 20 m2/g or more. In addition, in the present invention, there is provided a grain-oriented electrical steel sheet including: a base metal; and an insulation coating provided on a surface of the base metal, in which the insulation coating contains SiO2, and one or two of Al2O3 and MgO, and has a porosity of 10% or less.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 7, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi YAMAZAKI, Kazutoshi TAKEDA, Hiroyasu FUJII, Toru NAGAI
  • Publication number: 20200399732
    Abstract: 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: Application
    Filed: March 19, 2019
    Publication date: December 24, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi KATAOKA, Nobusato MORISHIGE, Haruhiko ATSUMI, Kazutoshi TAKEDA, Shin FURUTAKU, Hirotoshi TADA, Ryosuke TOMIOKA
  • Publication number: 20200354582
    Abstract: A coating solution for forming an insulating film for a grain-oriented electrical steel sheet which contains one or more types of hydrous silicate powders having an average particle size of 2 ?m or less, and one or more types of phosphoric acids and phosphates satisfying a relation of ?niMi/?Pi?0.5, and satisfies (Formula 1). 1.5?(?niMi+?n?jM?j)/?Pi?15 . . . (Formula 1) (P represents the number of moles of phosphorus, M represents the number of moles of metal ions derived from the phosphate, n represents the valence of the metal ions derived from the phosphate, i represents the number of types of phosphates, M? represents the number of moles of metal elements in the hydrous silicate, n? represents the valence of the metal elements in the hydrous silicate, and j represents the number of types of hydrous silicates).
    Type: Application
    Filed: November 13, 2018
    Publication date: November 12, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi YAMAZAKI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Patent number: 10706998
    Abstract: An electrical steel sheet has an insulation coating on a steel sheet surface. The insulation coating includes: a binder consisting of 100 parts by mass of a metal phosphate and 1 to 50 parts by mass of an organic resin having an average particle size of 0.05 to 0.50 ?m; and a carboxylic acid-containing compound with a carbon number of 2 to 50 in an amount of 0.1 to 10.0 parts by mass based on 100 parts by mass of solids content of the binder. The organic resin is at least one selected from the group consisting of acrylic resins, epoxy resins, and polyester resins. The insulation coating of this electrical steel sheet shows good edge corrosion resistance after blanking.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: July 7, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Hiroyasu Fujii, Masaru Takahashi, Shuichi Yamazaki, Hiroki Hori
  • Patent number: 10669432
    Abstract: An insulating coating film obtained by mixing 0.5 parts by mass to 10 parts by mass of a copolymer of a fluoroolefin and an ethylenically unsaturated compound when converted into a solid content with 100 parts by mass in solid content of a mixture composed of a metal phosphate and a specific organic resin or a mixture composed of colloidal silica and a specific organic resin is designed to be provided on a surface of an electrical steel sheet, and in this manner, it is possible to obtain an electrical steel sheet having good corrosion resistance under a wet environment and having good properties related to the insulating coating film such as a space factor and adhesiveness.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: June 2, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Kenji Kosuge, Tatsuya Takase, Koji Muneda
  • Patent number: 10665372
    Abstract: An electrical steel sheet provides: a steel strip (1) for an electrical steel sheet; and an insulating film (2) formed at a surface of the steel strip (1) and containing metal phosphate and organic resin. At least a part of the metal phosphate includes at least one kind of crystal structure selected from a group consisting of a cubic system, a tetragonal system, a hexagonal system, and an orthorhombic system. The organic resin contains at least one kind selected from a group consisting of an acryl-based resin, an epoxy-based resin, and a polyester resin having a carboxyl group or a hydroxyl group at a surface of an emulsion particle for one part by mass to 50 parts by mass relative to 100 parts by mass of the metal phosphate.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: May 26, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Kenji Kosuge, Tatsuya Takase, Hiroyasu Fujii
  • Patent number: 10604848
    Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). Three conditions (1.8?3[Fe]/[P]+?nM[M]/[P]?3.6, 0.6??nM[M]/[P]?2.4, and 0.6?3[Fe]/[P]?2.4) are satisfied in a region of 50 area % or more of a cross section parallel to a thickness direction of the insulating film. [Fe] denotes a proportion (atom %) of Fe, [P] denotes a proportion (atom %) of P, [M] denotes a proportion (atom %) of each of Al, Zn, Mg and Ca, and nM denotes a valence of each of Al, Zn, Mg and Ca.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: March 31, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaru Takahashi, Shuichi Yamazaki, Kazutoshi Takeda, Hiroyasu Fujii
  • Publication number: 20200040423
    Abstract: 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: Application
    Filed: July 19, 2018
    Publication date: February 6, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiaki NATORI, Kazutoshi TAKEDA, Hiroyoshi YASHIKI, Miho TOMITA, Hiroshi FUJIMURA, Takeaki WAKISAKA, Tesshu MURAKAWA, Takuya MATSUMOTO, Hiroki HORI, Yuuya GOHMOTO, O UYAMA
  • Patent number: 10549315
    Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2), the insulating film (3) containing a polyvalent metal phosphate and Fe. A maximum value of a parameter Q expressed by “Q=CFe—O/CP” is equal to or less than 1.3 times and equal to or more than 1.09 times an average value of the parameter Q in a region from a first depth from a surface of the insulating film to a second depth, CFe—O denoting a proportion (atom %) of Fe bonded to O relative to all elements, and CP denoting a proportion (atom %) of P relative to all elements. The first depth is 20 nm from the surface, and the second depth is a depth where the proportion of P is equal to a proportion of metal Fe.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: February 4, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaru Takahashi, Shuichi Yamazaki, Kazutoshi Takeda, Hiroyasu Fujii
  • Patent number: 10519551
    Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). The insulating film (3) contains a phosphates of one or more selected from the group consisting of Al, Zn, Mg and Ca. The phosphate exhibits a specific peak having a top within a range of ?26 ppm to ?16 ppm in a solid 31P-NMR spectrum, and a proportion of an integrated intensity of the specific peak relative to an integrated intensity of all peaks in the solid 31P-NMR spectrum is 30% or more.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: December 31, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shuichi Yamazaki, Masaru Takahashi, Kazutoshi Takeda, Hiroyasu Fujii, Koji Kanehashi
  • Publication number: 20190367746
    Abstract: 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: Application
    Filed: March 23, 2018
    Publication date: December 5, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi TAKEDA, Yoshiaki NATORI, Takuya MATSUMOTO, Hiroyoshi YASHIKI
  • Publication number: 20190316239
    Abstract: 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: Application
    Filed: January 16, 2018
    Publication date: October 17, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI
  • Publication number: 20190316221
    Abstract: 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: Application
    Filed: January 16, 2018
    Publication date: October 17, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi YASHIKI, Yoshiaki NATORI, Kazutoshi TAKEDA, Susumu MUKAWA, Takuya MATSUMOTO, Koji FUJITA, Takashi MOROHOSHI, Masafumi MIYAZAKI
  • Publication number: 20190271087
    Abstract: A grain-oriented electrical steel sheet has a steel sheet and an insulating coating which is formed on a surface of the steel sheet. In the insulating coating, a metal phosphate and a colloidal silica are contained, the colloidal silica is contained in an amount of 20 to 150 parts by mass with respect to 100 parts by mass of the metal phosphate, one or more kinds of fine particles selected from the group consisting of silicon carbide, silicon nitride, aluminum nitride, boron nitride, sialon, and cordierite are further contained in an amount of 0.5 to 7 parts by mass with respect to 100 parts by mass of the metal phosphate, an average particle size of the fine particles is 0.3 to 7.0 ?m, crystallized ratio of the metal phosphate is 2% to 40%, and chromium is not contained.
    Type: Application
    Filed: October 31, 2017
    Publication date: September 5, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi TAKEDA, Tomoya SUENAGA, Shuichi YAMAZAKI, Masaru TAKAHASHI
  • Publication number: 20190228891
    Abstract: 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: Application
    Filed: August 2, 2017
    Publication date: July 25, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshiaki NATORI, Hiroyoshi YASHIKI, Masaru TAKAHASHI, Kazutoshi TAKEDA, Takuya MATSUMOTO