Patents by Inventor Kei Sakata
Kei Sakata 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: 9862014Abstract: A method for manufacturing an electric resistance welded steel tube including: forming a steel tube material into an almost cylindrical open pipe, the steel tube material being a steel sheet wherein Ti and N satisfy (N/14)<(Ti/47.9); forming an electric resistance welded steel tube by bonding ends of the open pipe to each other by induction resistance welding with heat input controlled so that the bond width is 30 to 65 ?m; heating the electric resistance welded steel tube to a temperature equal to or higher than the Ac3 transformation temperature; and diameter-reducing rolling the heated electric resistance welded steel tube with rolling reduction expressed by an outer diameter ratio greater than (1?25/the bond width before diameter-reducing rolling (?m))×100% such that the bond width is 25 ?m or less.Type: GrantFiled: December 12, 2012Date of Patent: January 9, 2018Assignee: JFE Steel CorporationInventors: Yoshikazu Kawabata, Masayuki Sakaguchi, Kei Sakata
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Patent number: 8912462Abstract: A method of efficiently manufacturing electric resistance welding pipes having excellent characterization of welded seams is provided, by which each lateral edge of a rounded strip immediately before electric resistance welding is securely shaped with desired tapering flexibly in response to change in strip thickness, so that welding quality may be kept to be excellent. A method of manufacturing electric resistance welding pipes, in which a strip is subjected to forming, then edges thereof are formed to substantially face each other, and then the edges are subjected to electric resistance welding to form a pipe, wherein an edge and an edge opposed thereto at one of an upper-surface side and a lower-surface side of the strip are shaped with tapering before the forming by means of cutting or shaving, or finpass forming.Type: GrantFiled: November 9, 2006Date of Patent: December 16, 2014Assignee: JFE Steel CorporationInventors: Kazuhito Kenmochi, Takatoshi Okabe, Hiroyasu Yokoyama, Yuji Sugimoto, Yoshifumi Fujioka, Kei Sakata, Tomohiro Inoue, Hiroyuki Shirosawa, Motoaki Egi, Yasuo Nishida, Muneyoshi Murakami
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Patent number: 8747578Abstract: A steel having excellent formability, fatigue endurance after quenching, low temperature toughness, resistance for hydrogen embrittlement, and corrosion fatigue endurance. A method includes heating a steel slab at 1160° C. to 1320° C., hot-finish-rolling the steel slab at a finisher delivery temperature of 750° C. to 980° C., and then coiling the hot-rolled steel at a coiling temperature of 560° C. to 740° C. after slow cooling for a time of 2 seconds or more to produce a hot-rolled steel strip having a structure in which the ferrite grain diameter df corresponding to a circle is 1.1 ?m to less than 1.2 ?m and the ferrite volume fraction Vf is 30% to 98%, the steel slab containing 0.18 to 0.29% of C, 0.06 to 0.45% of Si, 0.91 to 1.85% of Mn, 0.019% or less of P, 0.0029% or less of S, 0.015 to 0.075% of sol. Al, 0.0049% or less of N, 0.0049% or less of O, 0.0001 to 0.0029% of B, 0.001 to 0.019% of Nb, 0.001 to 0.029% of Ti, 0.001 to 0.195% of Cr, and 0.001 to 0.Type: GrantFiled: December 9, 2004Date of Patent: June 10, 2014Assignees: JFE Steel Corporation, Toyota Jidosha Kabushiki KaishaInventors: Shunsuke Toyoda, Kei Sakata, Akio Sato, Kouichi Kaneko, Hiroshi Kawaguchi
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Patent number: 8512487Abstract: A seamless expandable oil country tubular article, which has a superior pipe expansion property in a expanding process at an expand ratio of more than about 30% although having a high strength such as a tensile strength (TS) of about 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, optionally necessary, by inexpensive nonthermal-refining type heat treatment.Type: GrantFiled: October 18, 2004Date of Patent: August 20, 2013Assignee: JFE Steel CorporationInventors: Yoshio Yamazaki, Yukio Miyata, Mitsuo Kimura, Kei Sakata, Masahito Tanaka
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Patent number: 8152152Abstract: An apparatus for sealing paper with paste includes a paper-feeding unit, a pasting main body which seals open ends of a sheet of paper by an adhesive, and a paper-receiving unit on which the sealed sheets of paper are loaded. The pasting main body includes an opening mechanism which opens a closed sheet of paper, an adhesive applying mechanism which applies a peelable temporary adhesive in a streaky form to a lower folded piece of the opened sheet of paper, a sealing mechanism which superposes an upper folded piece on the lower folded piece, and which temporarily adheres the open ends of the upper and lower folded pieces, and a conveying mechanism.Type: GrantFiled: September 10, 2009Date of Patent: April 10, 2012Assignee: Duplo Seiko CorporationInventor: Kei Sakata
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Patent number: 7942984Abstract: A steel pipe blank having a composition containing 0.5% or less C and 85% or more Fe in terms of mass percent is heated, and stretch-reducing is then performed so that the diameter decrease ratio is 15% or more and the rolling finishing temperature is (the Ar3 transformation point?10)° C. or lower. Consequently, a structure in which the ratio of X-ray diffraction intensity obtained from the plane in which the <100> direction of crystal grains is preferentially oriented parallel to the circumference direction and the <011> direction of crystal grains is preferentially oriented parallel to the rolling direction of the steel pipe to that obtained for a three-dimensionally randomly oriented sample is 3.0 or more is formed, and the r-value is increased, thereby improving the magnetic properties of the steel pipe.Type: GrantFiled: September 1, 2005Date of Patent: May 17, 2011Assignee: JFE Steel CorporationInventors: Yasuhide Ishiguro, Yoshikazu Kawabata, Kei Sakata, Masayuki Sakaguchi, Masayoshi Ishida, Motoaki Itadani, Yasue Koyama
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Publication number: 20110057377Abstract: An apparatus for sealing paper with paste includes a paper-feeding unit, a pasting main body which seals open ends of a sheet of paper by an adhesive, and a paper-receiving unit on which the sealed sheets of paper are loaded. The pasting main body includes an opening mechanism which opens a closed sheet of paper, an adhesive applying mechanism which applies a peelable temporary adhesive in a streaky form to a lower folded piece of the opened sheet of paper, a sealing mechanism which superposes an upper folded piece on the lower folded piece, and which temporarily adheres the open ends of the upper and lower folded pieces, and a conveying mechanism.Type: ApplicationFiled: September 10, 2009Publication date: March 10, 2011Applicant: Duplo Seiko CorporationInventor: Kei SAKATA
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Patent number: 7887649Abstract: A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.Type: GrantFiled: June 19, 2007Date of Patent: February 15, 2011Assignee: JFE Steel CorporationInventors: Shunsuke Toyoda, Masatoshi Aratani, Yoshikazu Kawabata, Yuji Hashimoto, Koji Suzuki, Kei Sakata, Makio Gunji, Akio Sato, Tetsuro Sawaki
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Publication number: 20100047609Abstract: An electric resistance welded steel tube for heat treatment can be used as a highly durable material even after quenching treatment by rapid heating for hollow stabilizers or the like and a method for manufacturing such an electric resistance welded steel tube. A steel tube material, which has a composition constituted by, in mass percent, C: 0.15 to 0.40%, Si: 0.05 to 0.50%, Mn: 0.30 to 2.00%, Al: 0.01 to 0.10%, Ti: 0.001 to 0.04%, B: 0.0005 to 0.0050%, and N: 0.0010 to 0.0100% with Ti and N satisfying (N/14)<(Ti/47.9).Type: ApplicationFiled: January 25, 2008Publication date: February 25, 2010Applicant: JFE STEEL CORPORATIONInventors: Yoshikazu Kawabata, Masayuki Sakaguchi, Kei Sakata
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Publication number: 20090277544Abstract: A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.Type: ApplicationFiled: June 19, 2007Publication date: November 12, 2009Applicant: JFE Steel Corporation, a corporation of JapanInventors: Shunsuke Toyoda, Masatoshi Aratani, Yoshikazu Kawabata, Yuji Hashimoto, Koji Suzuki, Kei Sakata, Makio Gunji, Akio Sato, Tetsuro Sawaki
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Publication number: 20090202384Abstract: A high tensile strength hot-rolled steel sheet having superior strain aging hardenability, which has high formability and stable quality characteristics, and in which satisfactory strength is obtained when the steel sheet is formed into automotive components, thus enabling the reduction in weight of automobile bodies. Specifically, a method for producing a high tensile strength hot-rolled steel sheet having superior strain aging hardenability with a BH of 80 MPa or more, a ?TS of 40 MPa or more, and a tensile strength of 440 MPa or more includes the steps of heating a steel slab to 1,000° C. or more, the steel slab containing, in percent by mass, 0.15% or less of C, 0.45% or less of Si, 3.0% or less of Mn, 0.08% or less of P, 0.02% or less of S, 0.02% or less of Al, 0.0050% to 0.0250% of N, and optionally 0.1% or less in total of at least one of more than 0.02% to 0.1% of Nb and more than 0.02% to 0.1% of V, the ratio N (mass %)/Al (mass %) being 0.Type: ApplicationFiled: February 9, 2009Publication date: August 13, 2009Applicant: JFE Steel Corporation, a Corporation of JapanInventors: Akio Tosaka, Sinjiro Kaneko, Yoichi Tominaga, Noriyuki Katayama, Nobutaka Kurosawa, Kei Sakata, Osamu Furukimi
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Patent number: 7527700Abstract: The present invention relates to a high strength hot rolled steel sheet consisting of 0.04 to 0.15% C, 1.5% or less Si, 0.5 to 1.6% Mn, 0.04% or less P, 0.005% or less S, 0.04% or less Al, 0.03 to 0.15% Ti, 0.03 to 0.5% Mo, by mass, and balance of Fe and inevitable impurities, and having a microstructure consisting of ferrite containing precipitates, second phase of bainite and/or martensite, and other phase, wherein the percentage of the ferrite containing precipitates is 40 to 95%, and the percentage of the other phase is 5% or less. For example, the high strength hot rolled steel sheet having a thickness of 1.4 mm shows a tensile strength of 780 MPa or higher, an elongation of 22% or higher elongation, and a hole expansion ratio of 60% or higher, thus the steel sheet is suitable for reinforcing members automobile cabin and crash worthiness members of automobile.Type: GrantFiled: April 21, 2004Date of Patent: May 5, 2009Assignee: JFE Steel CorporationInventors: Nobusuke Kariya, Shusaku Takagi, Tetsuo Shimizu, Tetsuya Mega, Kei Sakata, Hiroshi Takahashi
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Patent number: 7485194Abstract: This disclosure proposes a high-strength hot rolled steel sheet having excellent anti-die-galling property and anti-fatigue property, in which the steel sheet has a composition including C: not less than 0.02 mass % but not more than 0.2 mass %, Si: not less than 0.2 mass % but not more than 1.2 mass %, Mn: not less than 1.0 mass % but not more than 3.0 mass %, Mo: not less than 0.1 mass % but not more than 1.0 mass %, Al: not less than 0.01 mass % but not more than 0.1 mass %, P: not more than 0.03 mass % S: not more than 0.01 mass % and the remainder being substantially Fe and inevitable impurities, and has a steel microstructure containing not less than 55 vol % of ferrite and not less than 10 vol % but not more than 40 vol % of martensite provided that a total of both is not less than 95 vol %, and a ratio ds/dc of an average crystal grain size ds of the ferrite in a surface layer portion of the steel sheet to an average crystal grain size dc of the ferrite in a center portion of the steel sheet is 0.Type: GrantFiled: May 23, 2002Date of Patent: February 3, 2009Assignee: JFE Steel CorporationInventors: Tetsuya Mega, Kei Sakata
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Publication number: 20080230586Abstract: A method of efficiently manufacturing electric resistance welding pipes having excellent characterization of welded seams is provided, by which each lateral edge of a rounded strip immediately before electric resistance welding is securely shaped with desired tapering flexibly in response to change in strip thickness, so that welding quality may be kept to be excellent. A method of manufacturing electric resistance welding pipes, in which a strip is subjected to forming, then edges thereof are formed to substantially face each other, and then the edges are subjected to electric resistance welding to form a pipe, wherein an edge and an edge opposed thereto at one of an upper-surface side and a lower-surface side of the strip are shaped with tapering before the forming by means of cutting or shaving, or finpass forming.Type: ApplicationFiled: November 9, 2006Publication date: September 25, 2008Inventors: Kazuhito Kenmochi, Takatoshi Okabe, Hiroyasu Yokoyama, Yuji Sugimoto, Yoshifumi Fujioka, Kei Sakata, Tomohiro Inoue, Hiroyuki Shirosawa, Motoaki Egi, Yasuo Nishida, Muneyoshi Murakami
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Patent number: 7396420Abstract: The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, A1 and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a ?TS of 80 MPa or more.Type: GrantFiled: May 2, 2003Date of Patent: July 8, 2008Assignee: JFE Steel CorporationInventors: Saiji Matsuoka, Tetsuo Shimizu, Kei Sakata, Osamu Furukimi
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Patent number: 7347902Abstract: According to the invention, a high-strength hot rolled steel sheet having an excellent shape fixability as hot-rolled and an excellent fatigue durability after the forming, excellent weldability and phosphatability and a tensile strength of not less than 590 MPa level can be obtained by comprising C: not less than 0.02 mass % but not more than 0.2 mass %, Si: not less than 0.5 mass % but not more than 2.0 mass %, Mn: not less than 1.0 mass % but not more than 3.0 mass %, Al: not less than 0.01 mass % but not more than 0.1 mass %, N: not less than 0.002 mass % but not more than 0.006 mass %, P: not more than 0.03 mass %, S: not more than 0.01 mass % and solid-soluted (C+N): not less than 0.Type: GrantFiled: June 4, 2002Date of Patent: March 25, 2008Assignee: JFE Steel CorporationInventors: Tetsuya Mega, Kei Sakata, Kazuhiro Seto
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Publication number: 20080011389Abstract: A steel pipe with good magnetic properties and a method of producing the same are proposed. Specific solutions are as follows. A steel pipe blank having a composition containing 0.5% or less C and 85% or more Fe in terms of mass percent is heated, and stretch-reducing is then performed so that the diameter decrease ratio is 15% or more and the rolling finishing temperature is (the Ar3 transformation point ?10)° C. or lower. Consequently, a structure in which the ratio of X-ray diffraction intensity obtained from the plane in which the <100> direction of crystal grains is preferentially oriented parallel to the circumference direction and the <011> direction of crystal grains is preferentially oriented parallel to the rolling direction of the steel pipe to that obtained for a three-dimensionally randomly oriented sample is 3.0 or more is formed, and the r-value is increased, thereby improving the magnetic properties of the steel pipe.Type: ApplicationFiled: September 1, 2005Publication date: January 17, 2008Inventors: Yasuhide Ishiguro, Yoshikazu Kawabata, Kei Sakata, Masayuki Sakaguchi, Motoaki Itadani, Yasue Koyama, Masayoshi Ishida
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Patent number: 7252724Abstract: A high tensile strength hot-rolled steel sheet having superior strain aging hardenability, which has high formability and stable quality characteristics, and in which satisfactory strength is obtained when the steel sheet is formed into automotive components, thus enabling the reduction in weight of automobile bodies is provided. Specifically, a method for producing a high tensile strength hot-rolled steel sheet having superior strain aging hardenability with a BH of 80 MPa or more, a ?TS of 40 MPa or more, and a tensile strength of 440 MPa or more includes the steps of heating a steel slab to 1,000° C. or more, the steel slab containing, in percent by mass 0.15% or less of C, 2.0% or less of Si, 3.0% or less of Mn, 0.08% or less of P, 0.02% or less of S, 0.02% or less of Al, 0.0050% to 0.0250% of N, and optionally 0.1% or less in total of at least one of more than 0.02% to 0.1% of Nb and more than 0.02% to 0.1% of V, the ratio N (mass %)/Al (mass %) being 0.Type: GrantFiled: August 18, 2003Date of Patent: August 7, 2007Assignee: JFE Steel CorporationInventors: Akio Tosaka, Sinjiro Kaneko, Yoichi Tominaga, Noriyuki Katayama, Nobutaka Kurosawa, Kei Sakata, Osamu Furukimi
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Publication number: 20070144632Abstract: A steel having excellent formability, fatigue endurance after quenching, low temperature toughness, resistance for hydrogen embrittlement, and corrosion fatigue endurance. A method includes heating a steel slab at 1160° C. to 1320° C., hot-finish-rolling the steel slab at a finisher delivery temperature of 750° C. to 980° C., and then coiling the hot-rolled steel at a coiling temperature of 560° C. to 740° C. after slow cooling for a time of 2 seconds or more to produce a hot-rolled steel strip having a structure in which the ferrite grain diameter df corresponding to a circle is 1.1 ?m to less than 1.2 ?m and the ferrite volume fraction Vf is 30% to 98%, the steel slab containing 0.18 to 0.29% of C, 0.06 to 0.45% of Si, 0.91 to 1.85% of Mn, 0.019% or less of P, 0.0029% or less of S, 0.015 to 0.075% of sol. Al, 0.0049% or less of N, 0.0049% or less of O, 0.0001 to 0.0029% of B, 0.001 to 0.019% of Nb, 0.001 to 0.029% of Ti, 0.001 to 0.195% of Cr, and 0.001 to 0.Type: ApplicationFiled: December 9, 2004Publication date: June 28, 2007Applicants: JFE Steel Corporation, a corporation of Japan, Toyota Jidosha Kabushiki Kaisha, a corporation of JapanInventors: Shunsuke Toyoda, Kei Sakata, Akio Sato, Koichi Kaneko, Hiroshi Kawaguchi
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Publication number: 20070116975Abstract: The present invention provides a seamless expandable oil country tubular goods, which has a superior pipe expansion property in a expanding process at an expand ratio of more than 30% although having a high strength such as a tensile strength (TS) of 600 MPa or more, and a manufacturing method thereof, the seamless expandable oil country tubular goods being in an as-rolled state or being processed, whenever necessary, by inexpensive nonthermal-refining type heat treatment. In a particular product, 0.010% to less than 0.10% of C, 0.05% to 1% of Si, 0.5% to 4% of Mn, 0.03% or less of P, 0.015% or less of S, 0.01% to 0.06% of Al, 0.007% or less of N, and 0.005% or less of O are contained, and at least one of Nb, Mo, and Cr is contained in the range of 0.01% to 0.2% of Nb, 0.05% to 0.5% of Mo, and 0.05% to 1.5% of Cr, so that Mn+0.9×Cr+2.6×Mo?2.0 and 4×C?0.3×Si+Mn+1.3×Cr+1.5×Mo?4.5 are satisfied.Type: ApplicationFiled: October 18, 2004Publication date: May 24, 2007Inventors: Yoshio Yamazaki, Yukio Miyata, Mitsuo Kimura, Kei Sakata, Masahito Tanaka