Patents by Inventor Hiroshi Nakata

Hiroshi Nakata 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: 11326240
    Abstract: There is provided a hot-rolled steel sheet suitable for manufacturing an electric resistance welded steel tube, having workability necessary for roll forming and high yield strength, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after electric resistance welding. The steel sheet includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N contained at a specific content. The steel sheet has a microstructure containing 3% to 20% martensite and 10% or less retained austenite on a volume fraction basis, the remainder being bainite. The yield strength is set to 600 MPa or more, the tensile strength is set to 950 MPa or more, and the uniform elongation is set to 7.0% or more.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: May 10, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Akihide Matsumoto, Hiroshi Nakata, Shunsuke Toyoda
  • Patent number: 11214847
    Abstract: A high-strength hot-rolled steel sheet for an electric resistance welded steel pipe has decreased variations in in-plane material properties, high strength, and excellent ductility. The high-strength hot-rolled steel sheet has a composition containing, in mass %, C: 0.10 to 0.18%, Si: 0.1 to 0.5%, Mn: 0.8 to 2.0%, P: 0.001 to 0.020%, S: 0.005% or less, Al: 0.001 to 0.1%, Cr: 0.4 to 1.0%, Cu: 0.1 to 0.5%, Ni: 0.01 to 0.4%, Nb: 0.01 to 0.07%, N: 0.008% or less, and further Mo: 0.5% or less and/or V: 0.1% or less so that Moeq defined as Moeq=Mo+0.36Cr+0.77Mn+0.07Ni is 1.4 to 2.2, and Mo and V are contained to satisfy 0.05?Mo+V?0.5; and has a microstructure containing, in volume fraction, 80% or more of a bainite phase as a primary phase and 4 to 20% of a martensite phase and a retained austenite phase in total as a secondary phase, where the bainite phase has an average grain size of 1 to 10 ?m.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: January 4, 2022
    Assignee: JFE Steel Corporation
    Inventors: Hiroshi Nakata, Motohiko Urabe, Shuji Kawamura
  • Publication number: 20210001425
    Abstract: There are provided an electric resistance welded steel pipe for producing a high strength hollow stabilizer excellent in fatigue resistance and a high strength hollow stabilizer. In an electric resistance welded steel pipe (5) for producing a hollow stabilizer, an internal weld bead cut portion (30) has a three-peak shape and a depth (H) of a trough portion (30a) of the three-peak shape is 0.3 mm or less and an angle (?) formed by a central portion in the circumferential direction of the trough portion (30a) and the top of right and left peak portions (30b, 30c) located on both the right and left sides of the trough portion (30a) is 160° or more and less than 180°.
    Type: Application
    Filed: March 11, 2019
    Publication date: January 7, 2021
    Applicant: JFE Steel Corporation
    Inventors: Masatoshi Aratani, Ryoji Matsui, Hiroshi Nakata, Tomonori Kondo, Hiromichi Hori
  • Publication number: 20190390311
    Abstract: There is provided a hot-rolled steel sheet suitable for manufacturing an electric resistance welded steel tube, having workability necessary for roll forming and high yield strength, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after electric resistance welding. The steel sheet includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N contained at a specific content. The steel sheet has a microstructure containing 3% to 20% martensite and 10% or less retained austenite on a volume fraction basis, the remainder being bainite. The yield strength is set to 600 MPa or more, the tensile strength is set to 950 MPa or more, and the uniform elongation is set to 7.0% or more.
    Type: Application
    Filed: December 14, 2017
    Publication date: December 26, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Akihide MATSUMOTO, Hiroshi NAKATA, Shunsuke TOYODA
  • Publication number: 20190390296
    Abstract: There is provided an electric resistance welded steel tube having a yield strength of 896 MPa or more, and excellent low-cycle fatigue resistance, for coiled tubing without performing whole-tube quenching treatment and reheating-tempering treatment after performing electric resistance welding and a method for manufacturing the same. The steel tube includes, by mass %, C, Si, Mn, P, S, Al, Cr, Cu, Ni, Mo, Nb, V, Ti, and N at a specific content. The steel tube has a microstructure that contains 2% to 10% retained austenite and 20% or less martensite on a volume fraction basis, and the remainder being bainite. The yield strength is set to 896 MPa or more and the uniform elongation is set to 9.0% or more.
    Type: Application
    Filed: December 14, 2017
    Publication date: December 26, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Akihide MATSUMOTO, Hiroshi NAKATA, Shunsuke TOYODA
  • Patent number: 10501838
    Abstract: The present invention provides a cooling device for a hot-dip plating device provided on an upper side of a plating thickness control device in a conveyance route of a hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction. The cooling device includes: a main cooling device that vertically sprays a main cooling gas to the hot-dip plated steel sheet; and a preliminary cooling device that is provided in a preliminary cooling section between the main cooling device and the plating thickness control device in the conveyance route, and sprays a preliminary cooling gas to a plurality of gas collision positions which are set along the preliminary cooling section.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: December 10, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tooru Oohashi, Kazuki Machida, Hiroshi Nakata, Katsuya Kojima, Kohhei Hayakawa
  • Publication number: 20190211430
    Abstract: A hot-rolled steel sheet for a heavy-wall, high-strength line pipe, the steel sheet having a chemical composition including, in mass %, C: 0.02 to 0.20%, Mn: 0.80 to 2.10%, Si: 0.01 to 0.50%, P: 0.034% or less, S: 0.0050% or less, Nb: 0.01 to 0.15%, Ti: 0.001 to 0.030%, and Al: 0.001 to 0.080%, the balance being Fe and incidental impurities, the steel sheet having a microstructure in which a main phase is a continuous cooling transformation structure and in which {001}? grains in a plane whose normal direction is the sheet width direction constitute an area fraction of 10% or less and have a combined size of 10 ?m or less, wherein the steel sheet has a tensile strength of 520 MPa or greater, and, in a drop weight tear test, a temperature at which a percent ductile fracture reaches 85% is ?25° C. or lower.
    Type: Application
    Filed: June 6, 2017
    Publication date: July 11, 2019
    Applicant: JFE Steel Corporation
    Inventors: Sota Goto, Hiroshi Nakata, Junji Shimamura
  • Publication number: 20190062862
    Abstract: A high-strength hot-rolled steel sheet for an electric resistance welded steel pipe has decreased variations in in-plane material properties, high strength, and excellent ductility. The high-strength hot-rolled steel sheet has a composition containing, in mass %, C: 0.10 to 0.18%, Si: 0.1 to 0.5%, Mn: 0.8 to 2.0%, P: 0.001 to 0.020%, S: 0.005% or less, Al: 0.001 to 0.1%, Cr: 0.4 to 1.0%, Cu: 0.1 to 0.5%, Ni: 0.01 to 0.4%, Nb: 0.01 to 0.07%, N: 0.008% or less, and further Mo: 0.5% or less and/or V: 0.1% or less so that Moeq defined as Moeq=Mo+0.36Cr+0.77Mn+0.07Ni is 1.4 to 2.2, and Mo and V are contained to satisfy 0.05?Mo+V?0.5; and has a microstructure containing, in volume fraction, 80% or more of a bainite phase as a primary phase and 4 to 20% of a martensite phase and a retained austenite phase in total as a secondary phase, where the bainite phase has an average grain size of 1 to 10 ?m.
    Type: Application
    Filed: January 23, 2017
    Publication date: February 28, 2019
    Inventors: Hiroshi Nakata, Motohiko Urabe, Shuji Kawamura
  • Publication number: 20170333982
    Abstract: A method of manufacturing a steel strip for coiled tubing includes melting molten steel having a composition including, in terms of percent by mass, C: 0.10% or more and 0.16% or less, Si: 0.1% or more and 0.5% or less, Mn: 0.5% or more and 1.5% or less, P: 0.02% or less, S: 0.005% or less, Sol. Al: 0.01% or more and 0.07% or less, Cr: 0.4% or more and 0.8% or less, Cu: 0.1% or more and 0.5% or less, Ni: 0.1% or more and 0.3% or less, Mo: 0.1% or more and 0.2% or less, Nb: 0.01% or more and 0.04% or less, Ti: 0.005% or more and 0.03% or less, N: 0.005% or less, and the balance of Fe and inevitable impurities; casting the molten steel into a steel material; subjecting the steel material to hot rolling; and coiling a resultant steel strip, wherein a finish rolling temperature is 820° C. or more and 920° C. or less, a coiling temperature is 550° C. or more and 620° C. or less, and a time taken from the finish hot rolling to the coiling is 20 seconds or less.
    Type: Application
    Filed: August 7, 2017
    Publication date: November 23, 2017
    Inventors: Yasuhiro Matsuki, Takahiko Ogura, Chikara Kami, Hiroshi Nakata
  • Publication number: 20170275746
    Abstract: The present invention provides a cooling device for a hot-dip plating device provided on an upper side of a plating thickness control device in a conveyance route of a hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction. The cooling device includes: a main cooling device that vertically sprays a main cooling gas to the hot-dip plated steel sheet; and a preliminary cooling device that is provided in a preliminary cooling section between the main cooling device and the plating thickness control device in the conveyance route, and sprays a preliminary cooling gas to a plurality of gas collision positions which are set along the preliminary cooling section.
    Type: Application
    Filed: October 24, 2014
    Publication date: September 28, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tooru OOHASHI, Kazuki MACHIDA, Hiroshi NAKATA, Katsuya KOJIMA, Kohhei HAYAKAWA
  • Publication number: 20170270478
    Abstract: In a message delivery system, after completion of receiving a package, or after a deliverer has completed verification of the identity of a recipient of a package, a message associated with the package can be delivered to the recipient. For example, a message delivery system includes: a storage unit (130) that stores a message, a receiver of the message, information on a package associated with the message, and a delivery date and time at which the message is to be delivered; a receiving unit (1211) that receives identity verified data which indicates that a deliverer has verified the identity of the recipient upon delivery of the package; and a delivery unit (1212) that delivers the message associated with the package to the receiver after receiving the identity-verified data, or if no such identity verified data has been received even after the delivery date and time have passed.
    Type: Application
    Filed: August 21, 2015
    Publication date: September 21, 2017
    Applicant: KEEPTREE, LTD.
    Inventors: Hiroshi NAKATA, Masayoshi KIMURA
  • Patent number: 9580782
    Abstract: A high-tensile-strength hot-rolled steel sheet is provided having a composition which contains 0.02 to 0.08% C, 0.01 to 0.10% Nb, 0.001 to 0.05% Ti and Fe and unavoidable impurities as a balance, wherein the steel sheet contains C, Ti and Nb in such a manner that (Ti+(Nb/2))/C<4 is satisfied, and the steel sheet has a structure where a primary phase of the structure at a position 1 mm away from a surface in a sheet thickness direction is one selected from a group consisting of a ferrite phase, tempered martensite and a mixture structure of a ferrite phase and tempered martensite, a primary phase of the structure at a sheet thickness center position is formed of a ferrite phase, and a difference ?V between a structural fraction (volume %) of a secondary phase at the position 1 mm away from the surface in the sheet thickness direction and a structural fraction (volume %) of a secondary phase at the sheet thickness center position is 2% or less.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: February 28, 2017
    Assignee: JFE Steel Corporation
    Inventors: Chikara Kami, Hiroshi Nakata, Kinya Nakagawa
  • Patent number: 9540717
    Abstract: A steel material containing 0.01% to 0.07% C, 0.40% or less Si, 0.5% to 1.4% Mn, 0.1% or less Al, 0.01% to 0.15% Nb, 0.1% or less V, 0.03% or less Ti, and 0.008% or less N on a mass basis, Nb, V, and Ti satisfying Nb+V+Ti<0.15, Cm satisfying 0.12 or less, is heated to a heating temperature of 1,100° C. to 1,250° C., finish-rolled in such a way that the accumulative rolling reduction at a temperature of 930° C. or lower is 40% to 85% and the finished rolling temperature is 760° C. to 870° C., cooled to a cooling stop temperature of 500° C. or lower in terms of surface temperature at an average cooling rate of 30° C./s to 200° C./s in terms of thickness-wise center temperature, naturally cooled for more than 10 s after cooling is stopped, and coiled at a coiling temperature of 400° C. to 620° C.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: January 10, 2017
    Assignee: JFE Steel Corporation
    Inventors: Hiroshi Nakata, Tomoaki Shibata
  • Patent number: 9493865
    Abstract: A thick-walled high-strength hot rolled steel sheet has a high tensile strength TS of 521 MPa or more and excellent low-temperature toughness. The steel material forming the sheet contains 0.02%-0.08% C, 0.01%-0.10% Nb, and 0.001%-0.05% Ti and is heated; C, Ti, and Nb satisfies (Ti+(Nb/2))/C<4.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: November 15, 2016
    Assignee: JFE Steel Corporation
    Inventors: Chikara Kami, Hiroshi Nakata, Kinya Nakagawa
  • Patent number: 9440406
    Abstract: The present invention relates to a method of forming at least one circumferential belt layer of a pneumatic tire comprising: winding the strip for a half length of an outer circumferential length of the crown portion of the carcass along the tire equatorial plane from a widthwise inner side of the belt end region; winding the strip for the remaining half length while shifting the strip for the width of the strip from a widthwise inner to outer side; winding the strip for the outer circumferential length of the crown portion of the carcass along the tire equatorial plane; winding the strip for the half length of the outer circumferential length of the crown portion of the carcass while shifting the strip for the width of the strip from the widthwise outer to inner side; and winding the strip for the remaining half length along the tire equatorial plane.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: September 13, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yusuke Yoshikawa, Hiroshi Nakata, Takashi Oono, Makoto Tsuruta
  • Patent number: 9085115
    Abstract: The present invention relates to a method of forming at least one circumferential belt layer of a pneumatic tire comprising: winding the strip for a half length of an outer circumferential length of the crown portion of the carcass along the tire equatorial plane from a widthwise inner side of the belt end region; winding the strip for the remaining half length while shifting the strip for the width of the strip from a widthwise inner to outer side; winding the strip for the outer circumferential length of the crown portion of the carcass along the tire equatorial plane; winding the strip for the half length of the outer circumferential length of the crown portion of the carcass while shifting the strip for the width of the strip from the widthwise outer to inner side; and winding the strip for the remaining half length along the tire equatorial plane.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: July 21, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yusuke Yoshikawa, Hiroshi Nakata, Takashi Oono, Makoto Tsuruta
  • Publication number: 20150176110
    Abstract: A thick-walled high-strength hot rolled steel sheet has a high tensile strength TS of 521 MPa or more and excellent low-temperature toughness. The steel material forming the sheet contains 0.02%-0.08% C, 0.01%-0.10% Nb, and 0.001%-0.05% Ti and is heated; C, Ti, and Nb satisfies (Ti+(Nb/2))/C<4.
    Type: Application
    Filed: March 2, 2015
    Publication date: June 25, 2015
    Inventors: Chikara Kami, Hiroshi Nakata, Kinya Nakagawa
  • Publication number: 20150142877
    Abstract: A method in support of potential future delivery of digital content items over a data network includes obtaining at a server over the data network at least one digital content item for potential future delivery and delivery metadata pertaining to potential future delivery of the digital content item. The delivery metadata includes at least one recipient and a monitoring interval. The digital content item is stored by a processor of the server, and, during the monitoring interval, a user account associated with the digital content item is monitored by the processor for an occurrence of an inactivity benchmark. Upon a lapse of the monitoring interval without an occurrence of the inactivity benchmark, the digital content item is delivered to the at least one recipient. A system can be constructed to implement the method described herein.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 21, 2015
    Inventors: Hiroshi NAKATA, Tadashi TOMIYAMA, Masayoshi KIMURA, Jonathan B. LOEW, Jennifer DRUBIN
  • Publication number: 20150004050
    Abstract: A steel strip for coiled tubing contains, in terms of percent by mass, C: 0.10% or more and 0.16% or less, Si: 0.1% or more and 0.5% or less, Mn: 0.5% or more and 1.5% or less, P: 0.02% or less, S: 0.005% or less, Sol. Al: 0.01% or more and 0.07% or less, Cr: 0.4% or more and 0.8% or less, Cu: 0.1% or more and 0.5% or less, Ni: 0.1% or more and 0.3% or less, Mo: 0.1% or more and 0.2% or less, Nb: 0.01% or more and 0.04% or less, Ti: 0.005% or more and 0.03% or less, N: 0.005% or less, and the balance of Fe and inevitable impurities.
    Type: Application
    Filed: January 18, 2013
    Publication date: January 1, 2015
    Inventors: Yasuhiro Matsuki, Takahiko Ogura, Chikara Kami, Hiroshi Nakata
  • Publication number: 20140352852
    Abstract: The steel sheet has a chemical composition containing, by mass %, C: 0.04-0.08%, Si: 0.50% or less, Mn: 0.8-2.2%, P: 0.02% or less, S: 0.006% or less, Al: 0.1% or less, N: 0.008% or less, and Cr: 0.05-0.8%, and further Nb: 0.01-0.08%, V: 0.001-0.12%, and Ti: 0.005-0.04% in adjusted amounts, with the balance including Fe and incidental impurities. The steel sheet has a surface layer having a microstructure containing bainite as a main phase, martensite as a second phase in a volume fraction of 0.5-4%, and at lease one of ferrite phase, pearlite, and cementite as a third phase in a total volume fraction of 10% or less.
    Type: Application
    Filed: December 21, 2012
    Publication date: December 4, 2014
    Inventors: Hiroshi Nakata, Tomoaki Shibata, Chikara Kami