Patents by Inventor Kiyokazu Ishizuka
Kiyokazu Ishizuka 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: 9512511Abstract: Exemplary embodiments of the present invention can provide a galvanization method for hot-rolled steel sheet, cold-rolled steel sheet, or plating sheet of various compositions, which can avoid nonplating defects by using an Ni preplating procedure. For example, an exemplary galvanization method can be provided for pickled hot-rolled steel sheet or annealed cold-rolled steel sheet which is free from non-plating defects which includes cleaning the surface of the plating sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere to a sheet temperature of about 430 to 500° C. at a heating a rate of about 20° C./sec or more, and then hot dip plating the sheet in a galvanization bath. The exemplary amount of Ni preplating can be determined based on the plate type and amount of Si in the sheet steel to produce a hot dip galvanization that is free from non-plating defects.Type: GrantFiled: April 14, 2006Date of Patent: December 6, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi
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Patent number: 9499894Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: GrantFiled: December 26, 2013Date of Patent: November 22, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Kaoru Kawasaki, Junji Haji
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Publication number: 20160284455Abstract: A treatment solution is applied on a surface of a base iron; and the treatment solution is baked and dried. The treatment solution contains a first component: 100 parts by mass in solid content, and a second component composed of particles of one or more kinds selected from a group consisting of a polyolefin wax, an epoxy resin and an acrylic resin, the particles having an average particle size of 2.0 ?m to 15.0 ?m and a melting point of 60° C. to 140° C.: 5 parts by mass to 45 parts by mass in resin solid content. The first component contains a colloidal silica: 100 parts by mass, and an emulsion of one kind selected from a group consisting of an acrylic resin, an epoxy resin and a polyester resin which have an average particle size of 0.05 ?m to 0.50 ?m, or an emulsion of a mixture or copolymer of two or three kinds selected from the group: 40 parts by mass to 400 parts by mass in resin solid content.Type: ApplicationFiled: June 10, 2016Publication date: September 29, 2016Inventors: Kazutoshi TAKEDA, Kenji Kosuge, Satoshi Arai, Kiyokazu Ishizuka
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Patent number: 9334555Abstract: Exemplary embodiments of the present invention can provide a hot dip galvannealed steel sheet which has excellent corrosion resistance, workability, coatability and appearance. The exemplary galvannealed sheet can include an ultra-low carbon steel sheet having a plating layer which includes about 8 to 13% Fe, about 0.05 to 1.0% Ni, about 0.15 to 1.5% Al, and a balance of Zn and unavoidable impurities. An exemplary method for producing a hot dip galvannealed steel sheet is also provided which can include cleaning an annealed ultra-low carbon steel sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere, plating the sheet in a galvanization bath containing Al, wiping it, then rapidly reheating it and either cooling the sheet without any soaking time or soaking and holding it for less than 15 seconds and then cooling it.Type: GrantFiled: January 17, 2013Date of Patent: May 10, 2016Assignee: NIPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Akihiro Miyasaka
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Publication number: 20150329946Abstract: A galvannealed steel sheet includes: a steel sheet; a coating layer on a surface of the steel sheet; and a mixed layer formed between the steel sheet and the coating layer, in which the mixed layer includes a base iron portion having fine grains having a size of greater than 0 ?m and equal to or smaller than 2 ?m, a Zn—Fe alloy phase, and oxides containing one or more types of Mn, Si, Al, and Cr, and in the mixed layer, the oxides and the Zn—Fe alloy phase are present in grain boundaries that form the fine grains and the Zn—Fe alloy phase is tangled with the base iron portion. [Mn]+[Si]+[Al]+[Cr]?0.Type: ApplicationFiled: December 25, 2012Publication date: November 19, 2015Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takeshi YASUI, Kojiro AKIBA, Kiyokazu ISHIZUKA, Koki TANAKA
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Patent number: 9051622Abstract: A non-oriented magnetic steel sheet contains, by mass %, C: 0.005% or less; Si: 2% to 4%; Mn and V: totally 11% or less; and Al: 3% or less, with the balance being Fe and inevitable impurities, wherein a Mn concentration (mass %) and a V concentration (mass %) in a thickness direction satisfy the following formula. 0.1<(XsMn,V?XcMn,V)/tMn,V<100, where XsMn,V: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a surface of the steel sheet, XcMn,V: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a center of the steel sheet, and tMn,V: a depth (mm), from the surface of the steel sheet, of a position where the sum of the Mn concentration (mass %) and the V concentration (mass %) is equal to XcMn,V.Type: GrantFiled: March 9, 2010Date of Patent: June 9, 2015Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Satoshi Arai, Yasuhide Morimoto, Kiyokazu Ishizuka, Kazutoshi Takeda
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Publication number: 20150037684Abstract: A steel foil according to an aspect of the present invention includes, by mass %, C: 0.0001 to 0.02%; Si: 0.001 to 0.01%; Mn: 0.01 to 0.3%; P: 0.001 to 0.02%; S: 0.0001 to 0.01%; Al: 0.0005 to 0.1%; N: 0.0001 to 0.004%; and a balance consisting of Fe and impurities, wherein a thickness is 5 to 15 ?m, and a tensile strength is more than 900 MPa and 1.200 MPa or less.Type: ApplicationFiled: April 18, 2013Publication date: February 5, 2015Inventors: Kiyokazu Ishizuka, Yuji Kubo, Jun Nakatsuka, Shuji Nagasaki
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Publication number: 20140287259Abstract: A steel foil according to an aspect of the present invention includes a rolled steel foil; and a Ni having <111>//RD texture plated on an outermost layer of the rolled steel foil. Regarding the steel foil, a <111> pole density in an inverse pole figure of a rolling direction may be 3.0 or more and 6.0 or less.Type: ApplicationFiled: April 18, 2013Publication date: September 25, 2014Inventors: Kiyokazu Ishizuka, Yuji Kubo, Jun Nakatsuka, Shuji Nagasaki
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Publication number: 20140199487Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: ApplicationFiled: December 26, 2013Publication date: July 17, 2014Applicant: NIPPON STEEL CORPORATIONInventors: KIYOKAZU ISHIZUKA, KAZUMI NISHIMURA, IKUO KIKUCHI, KAORU KAWASAKI, JUNJI HAJI
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Patent number: 8617324Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: GrantFiled: September 13, 2012Date of Patent: December 31, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Kaoru Kawasaki, Junji Haji
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Publication number: 20130008569Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: ApplicationFiled: September 13, 2012Publication date: January 10, 2013Applicant: Nippon Steel CorporationInventors: KIYOKAZU ISHIZUKA, Kazumi Nishimura, Ikuo Kikuchi, Kaoru Kawasaki, Junji Haji
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Patent number: 8303739Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: GrantFiled: April 14, 2006Date of Patent: November 6, 2012Assignee: Nippon Steel CorporationInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Kaoru Kawasaki, Junji Haji
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Publication number: 20120171467Abstract: An electrical steel sheet (10) is provided with a base iron (1) and an insulating film (2) formed on a surface of the base iron (1). The insulating film (2) includes 100 parts by mass of a first component containing a metal phosphate, and 5 parts by mass to 45 parts by mass of a second component composed of particles of one or more kinds selected from a group consisting of a polyolefin wax, an epoxy resin and an acrylic resin, the particles having an average particle size of 2.0 ?m to 15.0 ?m and a melting point of 60° C. to 140° C.Type: ApplicationFiled: September 2, 2010Publication date: July 5, 2012Inventors: Kazutoshi Takeda, Kenji Kosuge, Satoshi Arai, Kiyokazu Ishizuka
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Publication number: 20120009436Abstract: A non-oriented magnetic steel sheet contains, by mass %, C: 0.005% or less; Si: 2% to 4%; Mn and V: totally 11% or less; and Al: 3% or less, with the balance being Fe and inevitable impurities, wherein a Mn concentration (mass %) and a V concentration (mass %) in a thickness direction satisfy the following formula. 0.1<(XsMn,V?XcMn,V)/tMn,V<100, where XsMn,V: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a surface of the steel sheet, XcMn,V: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a center of the steel sheet, and tMn,V: a depth (mm), from the surface of the steel sheet, of a position where the sum of the Mn concentration (mass %) and the V concentration (mass %) is equal to XcMn,V.Type: ApplicationFiled: March 9, 2010Publication date: January 12, 2012Applicant: NIPPON STEEL CORPORATIONInventors: Satoshi Arai, Yasuhide Morimoto, Kiyokazu Ishizuka, Kazutoshi Takeda
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Publication number: 20090211668Abstract: Exemplary embodiments of the present invention can provide a method for producing hot dip galvannealed steel sheet which exhibits high strength, high ductility, and a significant degree of alloying. Such exemplary method can be applied to, e.g., a pickled hot rolled steel sheet or an annealed and pickled cold rolled steel sheet containing between about 0.02% and about 0.2% C and between about 0.15% and about 2.5% Mn, and may include one or more procedures for rinsing the sheet, preplating the sheet with Ni, rapidly heating the sheet in a nonoxidizing atmosphere to a sheet temperature of about 430° C. to 500° C., then hot dip plating the sheet in a galvanizing bath containing between about 0.05% and about 0.2% Al, and then immediately heating the sheet rapidly for an alloying treatment. Such exemplary method can provide an improved alloying speed, improved plating appearance and better plating adhesion.Type: ApplicationFiled: April 14, 2006Publication date: August 27, 2009Applicant: Nippon Steel CorporationInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Kaoru Kawasaki, Junji Haji
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Publication number: 20090200174Abstract: Exemplary embodiments of the present invention can provide a galvanization method for hot-rolled steel sheet, cold-rolled steel sheet, or plating sheet of various compositions, which can avoid nonplating defects by using an Ni preplating procedure. For example, an exemplary galvanization method can be provided for pickled hot-rolled steel sheet or annealed cold-rolled steel sheet which is free from non-plating defects which includes cleaning the surface of the plating sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere to a sheet temperature of about 430 to 500° C. at a heating a rate of about 20° C./sec or more, and then hot dip plating the sheet in a galvanization bath. The exemplary amount of Ni preplating can be determined based on the plate type and amount of Si in the sheet steel to produce a hot dip galvanization that is free from non-plating defects.Type: ApplicationFiled: April 14, 2006Publication date: August 13, 2009Applicant: Nippon Steel CorporationInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi
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Publication number: 20090162691Abstract: Exemplary embodiments of the present invention can provide a hot dip galvannealed steel sheet which has excellent corrosion resistance, workability, coatability and appearance. The exemplary galvannealed sheet can include an ultra-low carbon steel sheet having a plating layer which includes about 8 to 13% Fe, about 0.05 to 1.0% Ni, about 0.15 to 1.5% Al, and a balance of Zn and unavoidable impurities. An exemplary method for producing a hot dip galvannealed steel sheet is also provided which can include cleaning an annealed ultra-low carbon steel sheet, preplating it with Ni, rapidly heating the sheet in a nonoxidizing or reducing atmosphere, plating the sheet in a galvanization bath containing Al, wiping it, then rapidly reheating it and either cooling the sheet without any soaking time or soaking and holding it for less than 15 seconds and then cooling it.Type: ApplicationFiled: April 14, 2006Publication date: June 25, 2009Applicant: Nippon Steel CorporationInventors: Kiyokazu Ishizuka, Kazumi Nishimura, Ikuo Kikuchi, Akihiro Miyasaka
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Publication number: 20090151820Abstract: The present invention provides a method of production of hot dip galvannealed steel sheet with excellent workability compared with the Sendzimir method or non-oxidizing furnace method and further with excellent powdering or slidability, that is, a method of production of hot dip galvannealed steel sheet with excellent workability, powdering, and slidability characterized by processing a slab containing, by mass %, C: 0.01 to 0.12%, Mn: 0.05 to 0.6%, Si: 0.002 to 0.1%, P: 0.05% or less, S: 0.03% or less, sol. Al: 0.005 to 0.1%, and N: 0.01% or less and having a balance of Fe and unavoidable impurities by hot rolling, pickling, cold rolling, then annealing at 650 to 900° C., cooling to 250 to 450° C., holding at said temperature range for 120 seconds or more, then cooling to room temperature, pickling, preplating Ni or Ni—Fe without intermediate temper rolling, heating by 5° C./sec or more down to 430 to 500° C., galvanizing in a galvanization bath, wiping, then heating by a rate of temperature rise of 20° C.Type: ApplicationFiled: March 28, 2007Publication date: June 18, 2009Inventors: Junji Haji, Kaoru Kawasaki, Kiyokazu Ishizuka, Teruaki Yamada
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Patent number: 7029762Abstract: The present invention provides an inorganic-organic composite-treated zinc-plated steel sheet whose treated coatings do not contain any chromium and which is excellent in corrosion resistance after degreasing, coating adhesion and electrodeposition coating performance. The inorganic-organic composite-treated zinc-plated steel sheet, which is obtained by forming a zinc phosphate coating, in a coating weight of 0.3 to 5 g/m2, on the zinc-plated steel sheet surface and forming thereon a post-treatment coating, in a coating weight of 0.01 to 1 g/m2, by using a post-treatment composition containing at least one compound (A) selected from the group consisting of thiocarbonyl group-containing compounds, sulfide group-containing compounds and guanidyl group-containing compounds, an organic resin (B), a crosslinking agent (C) and an inorganic corrosion inhibitor (D).Type: GrantFiled: June 24, 2004Date of Patent: April 18, 2006Assignees: Nippon Steel Corporation, Nippon Paint Co., Ltd.Inventors: Kiyokazu Ishizuka, Hidetoshi Shindo, Atsushi Morishita, Koichi Saito, Motohiro Sasaki, Atsuhiko Tounaka
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Patent number: 7011895Abstract: The present invention is intended to provide an inorganic-organic composite-treated zinc-plated steel sheet whose treated coatings do not contain any hazardous chromate and which is excellent in corrosion resistance after alkaline degreasing and coating adhesion. An inorganic-organic composite-treated zinc-plated steel sheet which has a zinc phosphate coating, in a coating weight of 0.3 to 5 g/m2, on the zinc-plated steel sheet surface and, thereon, a post-treatment coating, in a coating weight of 0.01 to 1 g/m2, containing an organic resin (A), a zirconium compound (B), an inorganic corrosion inhibitor (C) and an organic corrosion inhibitor (D).Type: GrantFiled: June 24, 2004Date of Patent: March 14, 2006Assignee: Nippon Steel CorporationInventors: Kiyokazu Ishizuka, Hidetoshi Shindo, Koichi Saito, Motohiro Sasaki, Atsuhiko Tounaka