Patents by Inventor Shoichiro Taira
Shoichiro Taira 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: 10392706Abstract: A method for producing a galvanized steel sheet includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains P ions at a P concentration of 0.01 g/L or more and carbonate ions at a carbonate ion concentration of 0.1 g/L or more.Type: GrantFiled: February 27, 2015Date of Patent: August 27, 2019Assignee: JFE STEEL CORPORATIONInventors: Katsuya Hoshino, Shoichiro Taira, Masayasu Nagoshi, Kazutoshi Hanada
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Patent number: 10351960Abstract: Provided is a method for producing a galvanized steel sheet that includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains 0.1 g/L or more of carbonate ions.Type: GrantFiled: February 27, 2015Date of Patent: July 16, 2019Assignee: JFE Steel CorporationInventors: Katsuya Hoshino, Shoichiro Taira, Masayasu Nagoshi, Kazutoshi Hanada
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Patent number: 9809884Abstract: There is provided a method for manufacturing a galvanized steel sheet that has low sliding resistance in press forming and good degreasing property even under severe alkaline degreasing treatment conditions due to low temperature and short process line length. An oxide layer formed on the surface of a galvanized steel sheet is subjected to neutralization treatment using an alkaline aqueous solution containing 0.01 g/L or more of P ions and 0.01 g/L or more of colloid dispersed particles, wherein the alkaline aqueous solution preferably contains at least one phosphorus compound selected from phosphates, pyrophosphates, and triphosphates and at least one type of colloid dispersed particles selected from Ti, silica, Pt, Pd, Zr, Ag, Cu, Au, and Mg.Type: GrantFiled: January 14, 2014Date of Patent: November 7, 2017Assignee: JFE STEEL CORPORATIONInventors: Katsuya Hoshino, Shoichiro Taira, Wataru Tanimoto, Masayasu Nagoshi
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Publication number: 20170314138Abstract: A steel sheet coated with a zinc-based coating layer having a reaction layer on the surface of the steel sheet is manufactured by a method that includes bringing a steel sheet coated with a zinc-based coating layer into contact for 1.0 second or more with an alkaline aqueous solution containing one or more chelating agents selected from among sodium gluconate, sodium glucoheptonate, sodium citrate, tartaric acid, arabonic acid, galactonic acid, sorbit, mannite, glycerin, EDTA, and sodium tripolyphosphate in a total amount of 0.050 mass % or more and having a pH of 10.0 or more as a pre-treatment before a formation of the reaction layer, and forming the reaction layer being an oxide layer containing a crystal-structured substance expressed by Zn4(SO4)1-X(CO3)X(OH)6.nH2O.Type: ApplicationFiled: November 9, 2015Publication date: November 2, 2017Applicant: JFE STEEL CORPORATIONInventors: Katsuya Hoshino, Shoichiro Taira, Shinichi Furuya
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Publication number: 20170306507Abstract: A cold-rolled steel sheet has excellent chemical convertibility and excellent corrosion resistance after coating. A method of manufacturing a cold-rolled steel sheet includes first pickling applied to a steel sheet which is continuously annealed after cold rolling, second pickling applied to the steel sheet subsequently and, thereafter, neutralizing treatment applied to the steel sheet using an alkaline solution.Type: ApplicationFiled: August 12, 2015Publication date: October 26, 2017Inventors: Hiroyuki Masuoka, Shoichiro Taira, Shinichi Furuya
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Publication number: 20170016121Abstract: Provided is a method for producing a galvanized steel sheet that includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains 0.1 g/L or more of carbonate ions.Type: ApplicationFiled: February 27, 2015Publication date: January 19, 2017Applicant: JFE STEEL CORPRATIONInventors: Katsuya Hoshino, Shoichiro Taira, Masayasu Nagoshi, Kazutoshi Hanada
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Patent number: 9534269Abstract: A method of manufacturing a high strength cold rolled steel sheet includes hot-rolling and cold-rolling a steel slab annealing the steel sheet at an annealing temperature of 750° C. to 830° C.; subjecting the steel sheet to first cooling at an average cooling rate of 3° C./sec to 40° C./sec in a temperature range from the annealing temperature to 480° C.; subjecting the steel sheet to second cooling at an average cooling rate of 8° C./sec to 80° C./sec in a temperature range from 480° C. to Tc (° C.) given by formula (6): Tc=435?40×[% Mn]?30×[% Cr]?30×[% V]??(6) wherein [% A] is the content (% by mass) of alloying element A; and subjecting the steel sheet to third cooling at an average cooling rate of 0.3° C./sec to 30° C./sec in a temperature range from Tc (° C.) to 200° C.Type: GrantFiled: October 21, 2013Date of Patent: January 3, 2017Assignee: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira, Michitaka Sakurai, Yusuke Fushiwaki
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Publication number: 20160369406Abstract: A method for producing a galvanized steel sheet includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains P ions at a P concentration of 0.01 g/L or more and carbonate ions at a carbonate ion concentration of 0.1 g/L or more.Type: ApplicationFiled: February 27, 2015Publication date: December 22, 2016Inventors: Katsuya Hoshino, Shoichiro Taira, Masayasu Nagoshi, Kazutoshi Hanada
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Patent number: 9297060Abstract: The high strength galvanized steel sheet contains C: more than 0.015% and lower than 0.100%, Si: 0.3% or lower, Mn: lower than 1.90%, P: 0.015% or more and 0.05% or lower, S: 0.03% or lower, sol.Al: 0.01% or more and 0.5% or lower, N: 0.005% or lower, Cr: lower than 0.30%, B: 0.0003% or more and 0.005% or lower, and Ti: lower than 0.014% in terms of mass %, and satisfies 2.2?[Mneq]?3.1 and 0.42?8[% P]+150B*?0.73. The steel microstructure contains ferrite and a second phase, in which the second phase area ratio is 3 to 15%, the ratio of the area ratio of martensite and retained ? to the second phase area ratio is more than 70%, and 50% or more of the area ratio of the second phase exists in the grain boundary triple point.Type: GrantFiled: December 12, 2013Date of Patent: March 29, 2016Assignee: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira
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Patent number: 9255318Abstract: A high-strength galvanized steel sheet has a low YP, good stretch flangeability, and excellent corrosion resistance and contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2?[Mneq]?3.1 and [% Mn]+3.3[% Mo]?1.9, and [% Mn]+3.3[% Mo])/(1.3[% Cr]+8[% P]+150B*)<3.5 are satisfied.Type: GrantFiled: June 25, 2010Date of Patent: February 9, 2016Assignee: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira, Michitaka Sakurai, Yusuke Fushiwaki
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Publication number: 20160024660Abstract: There is provided a method for manufacturing a galvanized steel sheet that has low sliding resistance in press forming and good degreasing property even under severe alkaline degreasing treatment conditions due to low temperature and short process line length. An oxide layer formed on the surface of a galvanized steel sheet is subjected to neutralization treatment using an alkaline aqueous solution containing 0.01 g/L or more of P ions and 0.01 g/L or more of colloid dispersed particles, wherein the alkaline aqueous solution preferably contains at least one phosphorus compound selected from phosphates, pyrophosphates, and triphosphates and at least one type of colloid dispersed particles selected from Ti, silica, Pt, Pd, Zr, Ag, Cu, Au, and Mg.Type: ApplicationFiled: January 14, 2014Publication date: January 28, 2016Applicant: JFE STEEL CORPORATIONInventors: Katsuya Hoshino, Shoichiro Taira, Wataru Tanimoto, Masayasu Nagoshi
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Publication number: 20160002807Abstract: A process of manufacturing high-strength cold rolled steel sheets containing 0.5 to 2.0 mass % silicon includes a pickling step of thermally annealing a steel sheet in a non-oxidizing atmosphere and thereafter pickling the steel sheet to dissolve away 0.5 g/m2 to less than 2.0 g/m2 of the steel sheet, and an electroplating step of electroplating the surface of the pickled steel sheet with zinc under such conditions that a coating mass of 100 to 5000 mg/m2 is obtained.Type: ApplicationFiled: February 26, 2014Publication date: January 7, 2016Applicant: JFE STEEL CORPORATIONInventors: Shoichiro Taira, Wataru Tanimoto
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Patent number: 9039847Abstract: A multiphase steel sheet has a steel composition containing, in percent by mass, more than 0.015% to less than 0.100% of carbon, less than 0.40% of silicon, 1.0% to 1.9% of manganese, more than 0.015% to 0.05% of phosphorus, 0.03% or less of sulfur, 0.01% to 0.3% of soluble aluminum, 0.005% or less of nitrogen, less than 0.30% of chromium, 0.0050% or less of boron, less than 0.15% of molybdenum, 0.4% or less of vanadium, 0.02% or less of titanium, wherein [Mneq] is 2.0 to 2.8, the balance being iron and incidental impurities.Type: GrantFiled: July 27, 2010Date of Patent: May 26, 2015Assignee: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira, Michitaka Sakurai, Yusuke Fushiwaki
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Publication number: 20150013716Abstract: In a method for prevention of yellowing on a surface of a steel sheet subjected to re-pickling, washing with water and drying after a surface of a continuously annealed steel sheet is pickled to remove Si-containing oxide layer from a surface layer of the steel sheet, the surface of the steel sheet is held at a wet state between the pickling and the re-pickling and between the re-pickling and the washing, and more preferably the washing is carried out with water having an iron ion concentration decreased to not more than 20 g/L, whereby the yellowing on the surface of the steel sheet after the pickling is prevented. Thus, cold rolled steel sheets being excellent in not only the appearance quality but also the phosphatability and corrosion resistance after painting are manufactured stably.Type: ApplicationFiled: January 16, 2013Publication date: January 15, 2015Inventors: Hiroyuki Masuoka, Satoru Ando, Shigeyuki Aizawa, Kazuki Nakazato, Shoichiro Taira
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Patent number: 8815349Abstract: The invention provides a hot dip galvanized steel sheet which has: a hot dip galvanizing layer having a flat part on a surface thereof; and a film formed on the flat part. The film is composed of a compound containing Zn, Fe, and O, having an average film thickness A in a range from 10 to 100 nm determined by an element analysis of the film, and has {[Fe]/([Zn]+[Fe])} in the film in a range from 0.002 to 0.25, where [Zn] and [Fe] designate the content (% by atom) of Zn and Fe in the film, respectively. Since the hot dip galvanized steel sheet of the invention has excellent press-formability, bondability, and phosphatability, it is suitable for automobiles and electrical appliances.Type: GrantFiled: August 12, 2011Date of Patent: August 26, 2014Assignee: JFE Steel CorporationInventors: Shoichiro Taira, Yoshiharu Sugimoto, Yoichi Miyakawa, Akira Gamou, Masayasu Nagoshi, Takashi Kawano
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Publication number: 20140102597Abstract: The high strength galvanized steel sheet contains C: more than 0.015% and lower than 0.100%, Si: 0.3% or lower, Mn: lower than 1.90%, P: 0.015% or more and 0.05% or lower, S: 0.03% or lower, sol.Al: 0.01% or more and 0.5% or lower, N: 0.005% or lower, Cr: lower than 0.30%, B: 0.0003% or more and 0.005% or lower, and Ti: lower than 0.014% in terms of mass %, and satisfies 2.2?[Mneq]?3.1 and 0.42?8[% P]+150B*?0.73. The steel microstructure contains ferrite and a second phase, in which the second phase area ratio is 3 to 15%, the ratio of the area ratio of martensite and retained ? to the second phase area ratio is more than 70%, and 50% or more of the area ratio of the second phase exists in the grain boundary triple point.Type: ApplicationFiled: December 12, 2013Publication date: April 17, 2014Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira
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Publication number: 20140102596Abstract: A method of manufacturing a high strength cold rolled steel sheet includes hot-rolling and cold-rolling a steel slab annealing the steel sheet at an annealing temperature of 750° C. to 830° C.; subjecting the steel sheet to first cooling at an average cooling rate of 3° C./sec to 40° C./sec in a temperature range from the annealing temperature to 480° C.; subjecting the steel sheet to second cooling at an average cooling rate of 8° C./sec to 80° C./sec in a temperature range from 480° C. to Tc (° C.) given by formula (6): Tc=435?40×[% Mn]?30×[% Cr]?30×[% V](6) wherein [% A] is the content (% by mass) of alloying element A; and subjecting the steel sheet to third cooling at an average cooling rate of 0.3° C./sec to 30° C./sec in a temperature range from Tc (° C.) to 200° C.Type: ApplicationFiled: October 21, 2013Publication date: April 17, 2014Applicant: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira, Michitaka Sakurai, Yusuke Fushiwaki
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Patent number: 8636852Abstract: The high strength galvanized steel sheet contains C: more than 0.015% and lower than 0.100%, Si: 0.3% or lower, Mn: lower than 1.90%, P: 0.015% or more and 0.05% or lower, S: 0.03% or lower, sol.Al: 0.01% or more and 0.5% or lower, N: 0.005% or lower, Cr: lower than 0.30%, B: 0.0003% or more and 0.005% or lower, and Ti: lower than 0.014% in terms of mass %, and satisfies 2.2?[Mneq]?3.1 and 0.42?8[% P]+150B*?0.73. The steel microstructure contains ferrite and a second phase, in which the second phase area ratio is 3 to 15%, the ratio of the area ratio of martensite and retained ? to the second phase area ratio is more than 70%, and 50% or more of the area ratio of the second phase exists in the grain boundary triple point.Type: GrantFiled: February 2, 2010Date of Patent: January 28, 2014Assignee: JFE Steel CorporationInventors: Yoshihiko Ono, Kenji Takahashi, Kaneharu Okuda, Shoichiro Taira
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Publication number: 20120301709Abstract: A hot dip galvannealed steel sheet, which is a plated steel sheet, the plated sheet including an oxide layer being formed on the surface of the plated steel sheet, having an average thickness of 10 nm or more, and containing Zn and at least one element selected from the group consisting of Zr, Ti and Sn.Type: ApplicationFiled: August 9, 2012Publication date: November 29, 2012Applicant: JFE STEEL CORPRATIONInventors: Hiroyuki MASUOKA, Shoichiro TAIRA, Yoshiharu SUGIMOTO, Naoto YOSHIMI, Masayasu NAGOSHI, Wataru TANIMOTO
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Patent number: 8268095Abstract: A method of manufacturing a hot dip galvannealed steel sheet, including the steps of: subjecting a steel sheet to hot dip galvanizing to manufacture a hot dip galvanized steel sheet; heating the hot dip galvanized steel sheet for alloying; subjecting the hot dip galvanized steel sheet to temper rolling; bringing the temper-rolled hot dip galvanized steel sheet into contact with an acid solution containing at least one ion selected from the group consisting of Zr ions, Ti ions, and Sn ions to thereby form an acid solution film on the surface of the steel sheet; after completion of the contact, a state where the acid solution film is formed on the surface of the steel sheet is held for at least 1 second; and washing with water the hot dip galvanized steel sheet after holding, to thereby form a Zn oxide layer having a thickness of 10 nm or more on the surface of the galvanized steel sheet.Type: GrantFiled: April 26, 2007Date of Patent: September 18, 2012Assignee: JFE Steel CorporationInventors: Hiroyuki Masuoka, Shoichiro Taira, Yoshiharu Sugimoto, Naoto Yoshimi, Masayasu Nagoshi, Wataru Tanimoto