Patents by Inventor Ryuichi Suehiro

Ryuichi Suehiro 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: 10435791
    Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20?([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]?0.45??(1).
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: October 8, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya
  • Patent number: 10395807
    Abstract: There is provided a grain-oriented electrical steel sheet stably having excellent magnetic characteristics and coating adhesion even when a rapid heating is conducted in a primary recrystallization annealing (decarburization annealing). Concretely, it is a grain-oriented electrical steel sheet provided on its sheet surface with a tension-applying type insulation coating constituted with a coating layer A formed on a steel sheet side and mainly composed of an oxide and a coating layer B formed on a surface side and mainly composed of glass, characterized in that a ratio R (?B/?A) of a tension ?B of the coating layer B on the surface side applied to the steel sheet to a tension ?A of the coating layer on the steel sheet side A applied to the steel sheet is within a range of 1.20-4.0.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: August 27, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya
  • Patent number: 10294543
    Abstract: A method for producing a grain-oriented electrical steel sheet by subjecting a slab of an inhibitor-less ingredient system containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.010-0.8 mass % and extremely decreased Al, N, Se and S to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within range of 700-800° C. in a heating process of decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T2, a heating rate R1 between 500° C. and T1 is set to not less than 100° C./s and heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby grain-oriented electrical steel sheet having excellent iron loss property and coating peeling resistance is obtained in the inhibitor-less ingredient system while ensuring decarburization property even when rapid heating is performed during decarburization annealing.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: May 21, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Ryuichi Suehiro, Takashi Terashima, Makoto Watanabe, Toshito Takamiya, Takeshi Imamura
  • Patent number: 10294544
    Abstract: In a method for producing a grain-oriented electrical steel sheet by subjecting a slab containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.01-0.8 mass % and further containing Al and N, or S and/or Se, or Al, N, S and/or Se as inhibitor ingredients to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within a range of 700-800° C. in a heating process of the decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T2, a heating rate R1 between 500° C. and T1 is set to not less than 80° C./s and a heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby a grain-oriented electrical steel sheet having excellent magnetic properties and peeling resistance of forsterite coating is obtained while ensuring decarburization property.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: May 21, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Ryuichi Suehiro, Takashi Terashima, Makoto Watanabe, Toshito Takamiya
  • Patent number: 10192662
    Abstract: In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and PH2O/PH2 in an atmosphere of 0.25-0.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: January 29, 2019
    Assignee: JFE Steel Corporation
    Inventors: Makoto Watanabe, Takeshi Imamura, Ryuichi Suehiro, Toshito Takamiya
  • Publication number: 20180371620
    Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20?([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]?0.45??(1).
    Type: Application
    Filed: August 30, 2018
    Publication date: December 27, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Takashi TERASHIMA, Makoto WATANABE, Masanori UESAKA, Ryuichi SUEHIRO, Toshito TAKAMIYA
  • Publication number: 20180371621
    Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20?([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]?0.45??(1).
    Type: Application
    Filed: August 30, 2018
    Publication date: December 27, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Takashi TERASHIMA, Makoto WATANABE, Masanori UESAKA, Ryuichi SUEHIRO, Toshito TAKAMIYA
  • Patent number: 10134514
    Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled sheet to a hot band annealing as required and further to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to a primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 100˜700° C. in the heating process of the primary recrystallization annealing, the steel sheet is subjected to a holding treatment at any temperature of 250˜600° C. for 0.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: November 20, 2018
    Assignee: JFE Steel Corporation
    Inventors: Masanori Uesaka, Takeshi Imamura, Ryuichi Suehiro, Takayuki Fukunaga, Toshito Takamiya
  • Patent number: 10087529
    Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20?([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]?0.45??(1).
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: October 2, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya
  • Publication number: 20180251899
    Abstract: Provided is an insulative coating processing liquid with which an insulative coating can be obtained. The insulative coating processing liquid contains: at least one phosphate selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn; and two or more types of colloidal silicas having different mean particle diameters, wherein the total contained amount of the colloidal silicas in terms of the SiO2 solid content is 50-120 parts by mass with respect to 100 parts by mass of the solid content of the phosphate, a mean particle diameter ratio expressed as ri+1/ri is not lower than 1.5 when the mean particle diameters of the colloidal silicas are represented in an ascending order, and a mass ratio expressed as wi+1/(wi+1+wi) is 0.30-0.90 when the masses of the colloidal silicas in terms of the SiO2 solid content are represented in an ascending order of the respective mean particle diameters.
    Type: Application
    Filed: September 1, 2016
    Publication date: September 6, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Takashi Terashima, Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
  • Publication number: 20180230565
    Abstract: A grain-oriented electrical steel sheet has a coating on a surface thereof. The coating has a composite elastic modulus of 60 GPa to 95 GPa and a film thickness of 1.0 ?m or more, and a tension applied to the grain-oriented electrical steel sheet by the coating is 6.0 MPa or more, and an amount of iron loss degradation between before and after roll reduction when the grain-oriented electrical steel sheet is roll-reduced at a linear pressure of 68.6 N/cm is 0.010 W/kg or less in W17/50.
    Type: Application
    Filed: September 21, 2016
    Publication date: August 16, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Makoto WATANABE, Toshito TAKAMIYA, Ryuichi SUEHIRO, Takashi TERASHIMA
  • Patent number: 9984800
    Abstract: A grain-oriented electrical steel sheet allows for manufacture of a transformer that exhibits, when the steel sheet is applied to an iron core thereof, extremely low iron loss and extremely low noise properties, makes highly efficient use of energy, and can be used in various environments. The grain-oriented electrical steel sheet has a strain distribution in regions where closure domains are formed, when observed in a cross section in the rolling direction, with a maximum tensile strain in a sheet thickness direction being 0.45% or less, and with a maximum tensile strain t (%) and a maximum compressive strain c (%) in the rolling direction satisfying Expression (1): t+0.06?t+c?0.35??(1).
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: May 29, 2018
    Assignee: JFE Steel Corporation
    Inventors: Shigehiro Takajo, Ryuichi Suehiro, Hiroi Yamaguchi
  • Publication number: 20180087158
    Abstract: Provided are an insulation-coated oriented magnetic steel sheet having an insulating coat with excellent heat resistance; and a method for manufacturing the same. This insulation-coated oriented magnetic steel sheet has an oriented magnetic steel sheet, and an insulating coat arranged on the surface of the oriented magnetic steel sheet, the insulating coat containing Si, P, O, and Cr, and at least one element selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn. The XPS spectrum of the outermost surface of the insulating coat has peaks observed at Cr2p1/2 and Cr2p3/2.
    Type: Application
    Filed: March 11, 2016
    Publication date: March 29, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Takashi Terashima, Kazutoshi Hanada, Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
  • Publication number: 20180080127
    Abstract: Provided are an insulating-coated oriented magnetic steel sheet having an insulating coating of excellent heat resistance, and a method for manufacturing the same. This insulating-coated oriented magnetic steel sheet has an oriented magnetic steel sheet, and an insulating coating arranged on the surface of the oriented magnetic steel sheet. The insulating coating contains Si, P, and O, and at least one element selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn, the K-absorption edge of the P in the insulating coating having an XAFS spectrum that exhibits three absorption peaks from 2156 eV to 2180 eV.
    Type: Application
    Filed: March 11, 2016
    Publication date: March 22, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: TAKASHI TERASHIMA, Kazutoshi Hanada, Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
  • Patent number: 9875832
    Abstract: Provided is a grain-oriented electrical steel sheet, with reduced iron loss by magnetic domain refining treatment, exhibiting an excellent noise property and effectively reducing noise generated when stacked in an iron core of a transformer. In a grain-oriented electrical steel sheet including a forsterite film and a tension coating on both surfaces, magnetic domain refining treatment has been performed to apply linear thermal strain to the grain-oriented electrical steel sheet, the magnitude of deflection in the rolling direction of the steel sheet is 600 mm or more and 6000 mm or less as the curvature radius of the deflected surface with the surface having the strain applied thereto being the inner side, and the magnitude of deflection in the direction orthogonal to the rolling direction is 2000 mm or more as the curvature radius of the deflected surface with the surface having the strain applied thereto being the inner side.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: January 23, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Hiroi Yamaguchi, Seiji Okabe, Hirotaka Inoue, Ryuichi Suehiro
  • Publication number: 20180017868
    Abstract: Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion having a linear shape. Subsequently, electrolytic etching is performed at current density ?=I/S of 7.5 A/cm2 or more with respect to the exposed steel substrate portion, where I represents current supplied to an electrode and S represents surface area of the exposed steel substrate portion in a steel sheet surface of equal surface area to the electrode.
    Type: Application
    Filed: February 1, 2016
    Publication date: January 18, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Ryuichi SUEHIRO, Takashi TERASHIMA
  • Publication number: 20170298467
    Abstract: A grain oriented electrical steel sheet is subjected to a temperature holding treatment at a temperature T of 250-600° C. for 1-10 seconds in the primary recrystallization annealing and heated from temperature T to 700° C. at not less than 80° C./s and from 700° C. to a soaking temperature at not more than 15° C./s, wherein an oxygen potential from 700° C. to the soaking temperature is 0.2-0.4 and an oxygen potential during the soaking is 0.3-0.5 and an area ratio of secondary recrystallized grains is not less than 90% when an angle ? deviated from {110}<001> ideal orientation is less than 6.5° and an area ratio is not less than 75% when a deviation angle is less than 2.5° and an average length [L] in the rolling direction is not more than 20 mm and an average value [?] of the angle ? is 15.63×[?]+[L]<44.06.
    Type: Application
    Filed: October 5, 2015
    Publication date: October 19, 2017
    Inventors: Ryuichi Suehiro, Takashi Terashima, Toshito Takamiya, Makoto Watanabe, Masanori Uesaka
  • Patent number: 9748028
    Abstract: In a method for producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, Al: less than 0.0100 mass %, each of S, Se, O and N: not more than 0.0050 mass % and the remainder being Fe and inevitable impurities, subjecting the resulting hot rolled sheet to a single cold rolling or two or more cold rollings sandwiching an intermediate annealing therebetween to a final thickness, subjecting to a primary recrystallization annealing, applying an annealing separator thereto and then subjecting to a finish annealing, a zone of 550˜700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40˜200° C./s, while any temperature zone of 250˜550° C. is kept at a heating rate of not more than 10° C.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: August 29, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Yukihiro Shingaki, Takeshi Imamura, Ryuichi Suehiro, Yasuyuki Hayakawa, Yuiko Wakisaka
  • Patent number: 9748029
    Abstract: In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001 to 0.10 mass %, Si: 1.0 to 5.0 mass %, Mn: 0.01 to 0.5 mass %, S and/or Se: 0.005 to 0.040 mass %, sol. Al: 0.003˜0.050 mass % and N: 0.0010 to 0.020 mass %, subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness, performing primary recrystallization annealing, and thereafter applying an annealing separator to perform final annealing, a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40 to 200° C./s, while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1 to 10 seconds, whereby the refining of secondary recrystallized grains is attained and grain-oriented electrical steel sheets are stably obtained with a low iron loss.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: August 29, 2017
    Assignee: GINZA MARONIE P.C.
    Inventors: Yukihiro Shingaki, Takeshi Imamura, Ryuichi Suehiro, Makoto Watanabe
  • Patent number: 9738949
    Abstract: In a method for producing a grain-oriented electrical steel sheet by including a series of steps of hot rolling a raw steel material containing C: 0.002-0.10 mass %, Si: 2.0-8.0 mass % and Mn: 0.005-1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled steel sheet after or without hot band annealing to one stage cold rolling or two or more stage cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to decarburization annealing combined with primary recrystallization annealing, applying an annealing separator to the steel sheet surface, and then subjecting to a final annealing.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: August 22, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Takeshi Imamura, Yukihiro Shingaki, Makoto Watanabe, Ryuichi Suehiro, Toshito Takamiya