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).
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Patent number: 11756713Abstract: A grain-oriented magnetic steel sheet with chromium-free insulating tension coating includes a grain-oriented magnetic steel sheet and an insulating tension coating containing a phosphate salt and silica on a surface of the grain-oriented magnetic steel sheet, the coating further including a crystalline compound represented by the general formula (1): MII3MIII4(XVO4)6 . . . (1). A method for producing a grain-oriented magnetic steel sheet with chromium-free insulating tension coating includes applying an insulating tension coating liquid to a surface of a finish annealed grain-oriented magnetic steel sheet, the coating liquid including colloidal silica, a phosphate salt and a metal element M-containing compound in a specific ratio, and heat treating the steel sheet at least one time at a temperature of not less than 900° C. in an atmosphere including a non-oxidizing gas and having a dew point of not more than 0° C.Type: GrantFiled: September 8, 2017Date of Patent: September 12, 2023Assignee: JFE STEEL CORPORATIONInventors: Souichiro Yoshizaki, Makoto Watanabe, Ryuichi Suehiro
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Publication number: 20230234116Abstract: Provided are methods that can prevent either or both of kinking and collapsing of a steel sheet coiled in coil form regardless of the characteristics of the steel sheet. A method of determining a tension pattern of tension applied to a steel sheet to coil the steel sheet in coil form comprises calculating the tension pattern using an apparent elastic modulus in a radial direction of a coil.Type: ApplicationFiled: May 19, 2021Publication date: July 27, 2023Applicant: JFE STEEL CORPORATIONInventors: Ryuichi SUEHIRO, Naoki WATANABE, Ryosuke WATANABE
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Publication number: 20230212703Abstract: To form linear grooves of desired groove width on a metal strip surface and provide a grain-oriented electrical steel sheet having excellent magnetic properties, a linear groove formation method comprises: forming a resist coating on at least one surface of a metal strip; thereafter irradiating the resist coating with a laser while scanning the laser in a direction crossing a rolling direction of the metal strip, to remove the resist coating in a part irradiated with the laser; and thereafter performing etching treatment to form a linear groove in a part of the metal strip in which the resist coating is removed, wherein the resist coating contains a predetermined amount of an inorganic compound, and on the surface of the metal strip, the laser has a predetermined elliptic beam shape.Type: ApplicationFiled: March 26, 2021Publication date: July 6, 2023Applicant: JFE STEEL CORPORATIONInventors: Ryuichi SUEHIRO, Takeshi OMURA, Shigehiro TAKAJO, Yoshihisa ICHIHARA
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Patent number: 11578377Abstract: A grain-oriented electrical steel sheet having excellent iron loss property is produced from a steel slab containing, by mass %, C: 0.002-0.15%, Si: 2.5-6.0%, Mn: 0.01-0.80%, Al: 0.010-0.050% and N: 0.003-0.020%, when: a heating rate between 500-700° C. in decarburization annealing is not less than 80° C./s, a surface roughness Ra of a work roll in final cold rolling is 0.01-3.0 ?m, a total content of alkaline earth metals to MgO in annealing separator is 0-5 mass %, an average length L in rolling direction of passed crystal grains is not more than 25 mm, a ratio of crystal grains having a length in rolling direction of not more than 5 mm is 40-90%, and an existence ratio of alkaline earth metal sulfides having a size corresponding to circle of not less than 0.5 ?m in a cross section of forsterite film is not more than 0.2/?m per unit length in sheet width direction.Type: GrantFiled: May 10, 2018Date of Patent: February 14, 2023Assignee: JFE STEEL CORPORATIONInventors: Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
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Publication number: 20230037579Abstract: A steel strip notching method including forming a notch at an end portion of a joint in a strip width direction formed by joining a trailing end of a preceding steel strip to a leading end of a succeeding steel strip, and removing a region of the notch through grinding by cutting the region with a rotary grinding tool by feeding the tool in the strip width direction, feeding the tool in a strip vertical direction at a feed rate within a predetermined range with respect to a feed rate of the tool in the strip width direction, giving a predetermined feed amount in a strip longitudinal direction while feeding the tool by a predetermined feed amount in the strip width direction simultaneously with feeding the tool in the strip vertical direction, and cutting the region while oscillating the tool in the strip longitudinal direction.Type: ApplicationFiled: November 10, 2020Publication date: February 9, 2023Applicant: JFE STEEL CORPORATIONInventors: Yuu NAGAI, Ryuichi SUEHIRO, Ryota HOSOYA
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Publication number: 20220170131Abstract: A method of manufacturing a grain oriented electrical steel sheet includes hot rolling a steel slab having a chemical composition including C: 0.002-0.10 mass %, Si: 2.5-5.0 mass %, Mn: 0.01-0.8 mass %, Al: 0.010-0.050 mass % and N: 0.003-0.020 mass % and the remainder being Fe and inevitable impurities to form a hot rolled sheet; subjecting the hot rolled sheet to one cold rolling or two or more cold rollings and interposing an intermediate annealing therebetween after hot band annealing or without hot band annealing to form a cold rolled sheet having a final thickness; subjecting the cold rolled sheet to a primary recrystallization annealing; applying an annealing separator to the surface of the steel sheet; and subjecting the sheet to a finish annealing and forming a tension coating.Type: ApplicationFiled: February 17, 2022Publication date: June 2, 2022Inventors: Ryuichi Suehiro, Takashi Terashima, Toshito Takamiya, Makoto Watanabe, Masanori Uesaka
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Publication number: 20210287834Abstract: A grain-oriented magnetic steel sheet with chromium-free insulating tension coating includes a grain-oriented magnetic steel sheet and an insulating tension coating containing a phosphate salt and silica on a surface of the grain-oriented magnetic steel sheet, the coating further including a crystalline compound represented by the general formula (1): MII3MIII4(XVO4)6 . . . (1). A method for producing a grain-oriented magnetic steel sheet with chromium-free insulating tension coating includes applying an insulating tension coating liquid to a surface of a finish annealed grain-oriented magnetic steel sheet, the coating liquid including colloidal silica, a phosphate salt and a metal element M-containing compound in a specific ratio, and heat treating the steel sheet at least one time at a temperature of not less than 900° C. in an atmosphere including a non-oxidizing gas and having a dew point of not more than 0° C.Type: ApplicationFiled: September 8, 2017Publication date: September 16, 2021Applicant: JFE Steel CorporationInventors: Souichiro Yoshizaki, Makoto Watanabe, Ryuichi Suehiro
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Patent number: 10982329Abstract: 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: GrantFiled: March 11, 2016Date of Patent: April 20, 2021Assignee: JFE STEEL CORPORATIONInventors: Takashi Terashima, Kazutoshi Hanada, Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
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Patent number: 10920323Abstract: 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: GrantFiled: March 11, 2016Date of Patent: February 16, 2021Assignee: JFE STEEL CORPORATIONInventors: Takashi Terashima, Kazutoshi Hanada, Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
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Patent number: 10643770Abstract: When a steel sheet containing Si: 2-5 mass % after cold rolling is subjected to a primary recrystallization annealing and a finishing annealing for secondary recrystallization to form a grain-oriented electrical steel sheet, the primary recrystallization annealing is performed by rapid heating in the heating process and temperature keeping treatment at a certain temperature in the course of the heating to thereby obtain a grain-oriented electrical steel sheet having plural peaks in a distribution of misorientation angle between crystal orientation of secondary recrystallized grains and Goss orientation, wherein misorientation angle of the second smallest peak among the plural peaks is preferably not less than 5° and a grain size of secondary recrystallized grains is not more than 15 mm.Type: GrantFiled: December 11, 2013Date of Patent: May 5, 2020Assignee: JFE STEEL CORPORATIONInventors: Takeshi Imamura, Yukihiro Shingaki, Ryuichi Suehiro, Toshito Takamiya
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Publication number: 20200063234Abstract: A grain-oriented electrical steel sheet having excellent iron loss property is produced from a steel slab containing, by mass %, C: 0.002-0.15%, Si: 2.5-6.0%, Mn: 0.01-0.80%, Al: 0.010-0.050% and N: 0.003-0.020%, when: a heating rate between 500-700° C. In decarburization annealing is not less than 80° C./s, a surface roughness Ra of a work roll in final cold rolling is 0.01-3.0 ?m, a total content of alkaline earth metals to MgO in annealing separator is 0-5 mass %, an average length L in rolling direction of passed crystal grains is not more than 25 mm, a ratio of crystal grains having a length in rolling direction of not less than 0.5 ?m is 40-90%, and an existence ratio of alkaline earth metal sulfides having a size corresponding to circle of not less than 0.5 ?m in a cross section of forsterite film is not more than 0.2/?m per unit length in sheet width direction.Type: ApplicationFiled: May 10, 2018Publication date: February 27, 2020Applicant: JFE Steel CorporationInventors: Ryuichi Suehiro, Makoto Watanabe, Toshito Takamiya
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Patent number: 10458021Abstract: 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: GrantFiled: August 30, 2018Date of Patent: October 29, 2019Assignee: JFE STEEL CORPORATIONInventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya
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Patent number: 10435791Abstract: 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: GrantFiled: August 30, 2018Date of Patent: October 8, 2019Assignee: JFE STEEL CORPORATIONInventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya
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Grain-oriented electrical steel sheet having excellent magnetic characteristics and coating adhesion
Patent number: 10395807Abstract: 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: GrantFiled: October 23, 2014Date of Patent: August 27, 2019Assignee: JFE STEEL CORPORATIONInventors: Takashi Terashima, Makoto Watanabe, Masanori Uesaka, Ryuichi Suehiro, Toshito Takamiya -
Patent number: 10294543Abstract: 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: GrantFiled: May 11, 2015Date of Patent: May 21, 2019Assignee: JFE STEEL CORPORATIONInventors: Ryuichi Suehiro, Takashi Terashima, Makoto Watanabe, Toshito Takamiya, Takeshi Imamura
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Patent number: 10294544Abstract: 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: GrantFiled: May 11, 2015Date of Patent: May 21, 2019Assignee: JFE STEEL CORPORATIONInventors: Ryuichi Suehiro, Takashi Terashima, Makoto Watanabe, Toshito Takamiya
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Patent number: 10192662Abstract: 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: GrantFiled: February 12, 2014Date of Patent: January 29, 2019Assignee: JFE Steel CorporationInventors: Makoto Watanabe, Takeshi Imamura, Ryuichi Suehiro, Toshito Takamiya
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Publication number: 20180371620Abstract: 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: ApplicationFiled: August 30, 2018Publication date: December 27, 2018Applicant: JFE STEEL CORPORATIONInventors: Takashi TERASHIMA, Makoto WATANABE, Masanori UESAKA, Ryuichi SUEHIRO, Toshito TAKAMIYA
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Publication number: 20180371621Abstract: 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: ApplicationFiled: August 30, 2018Publication date: December 27, 2018Applicant: JFE STEEL CORPORATIONInventors: Takashi TERASHIMA, Makoto WATANABE, Masanori UESAKA, Ryuichi SUEHIRO, Toshito TAKAMIYA
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Patent number: 10134514Abstract: 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: GrantFiled: February 24, 2014Date of Patent: November 20, 2018Assignee: JFE Steel CorporationInventors: Masanori Uesaka, Takeshi Imamura, Ryuichi Suehiro, Takayuki Fukunaga, Toshito Takamiya