Patents by Inventor Soshi Yoshimoto

Soshi Yoshimoto 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).

  • Publication number: 20220298594
    Abstract: A steel sheet having a steel microstructure including, by area %, martensite in a range of 20% or more and 100% or less, ferrite in a range of 0% or more and 80% or less, and the balance being 5% or less. A residual stress generated at the transverse center of the steel sheet when the steel sheet is subjected to a V-bending process is 800 MPa or less. A residual stress generated at the transverse end of the steel sheet when the steel sheet is subjected to a V-bending process is 90% or more and 110% or less of the residual stress generated at the transverse center of the steel sheet. The maximum amount of warpage of the steel sheet sheared to a length of 1 m in the longitudinal direction is 15 mm or less.
    Type: Application
    Filed: August 25, 2020
    Publication date: September 22, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Takuya HIRASHIMA, Shimpei YOSHIOKA, Shinjiro KANEKO, Soshi YOSHIMOTO, Tomohiro HASHIMUKAI, Yoshihiko ONO
  • Publication number: 20220195555
    Abstract: A grain oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C:0.02-0.10%, Si:2.0-5.0%, Mn:0.01-1.00%, sol. Al:0.01-0.04%, N:0.004-0.020% and S+Se:0.002-0.040% to a temperature of higher than 1280° C., and subjecting the sheet to a hot rolling, a hot-band annealing, a single cold rolling or two or more cold rollings having an intermediate annealing between each cold rolling and a primary recrystallization annealing combined with a decarburization annealing, applying an annealing separator onto a steel sheet surface, and subjecting the sheet to a finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C./s from 800° C. to 300° C. in the cooling process from a maximum achieving temperature in at least one annealing of the hot-band annealing and the intermediate annealing.
    Type: Application
    Filed: April 22, 2020
    Publication date: June 23, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuiko EHASHI, Masanori TAKENAKA, Hirokazu SUGIHARA, Soshi YOSHIMOTO
  • Patent number: 11365489
    Abstract: A method for manufacturing an electroplated steel sheet by continuously performing electroplating on a steel sheet, the method including disposing a slit gas nozzle having an ejection port having a width wider than a width of the steel sheet in a width direction of the steel sheet on a side of an exit of an electroplating cell for the steel sheet to pass through, and ejecting a gas through the slit gas nozzle toward the steel sheet.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: June 21, 2022
    Assignee: JFE Steel Corporation
    Inventors: Gentaro Takeda, Yoshimichi Hino, Soshi Yoshimoto, Hideyuki Takahashi
  • Patent number: 11313020
    Abstract: A method for manufacturing a hot-dip metal plated steel strip having a plated layer formed on the outer surface thereof includes continuously immersing a steel strip in a bath tub that accommodates a molten metal plating bath, causing a sink roll disposed in the bath tub to change the traveling direction of the steel strip, then causing the steel strip to pass through two support rolls formed of a stabilizing roll and a correcting roll disposed above the sink roll but below the surface of the plating bath, and extracting the steel strip out of the bath. A flow regulation plate is disposed so as to cover at least the upper side of a roll body of the stabilizing roll out of the support rolls with a gap between the flow regulation plate and the stabilizing roll, and the flow of the molten metal plating bath directed toward a portion of the steel strip located from the exit of the support rolls to the surface of the plating bath is led toward the lower side of the stabilizing roll via the gap.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: April 26, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Hironari Kawabata, Soshi Yoshimoto, Takahiko Itagaki
  • Publication number: 20220042137
    Abstract: When a grain-oriented electrical steel sheet is produced by heating a steel slab containing, by mass %, C: 0.020 to 0.10%, Si: 2.0 to 4.0%, Mn: 0.005 to 0.50%, Al: less than 0.010%, N, S and Se: less than 0.0050% each to a temperature of not higher than 1280° C., subjecting slab to hot rolling, hot-band annealing, single cold rolling or two or more cold rollings having intermediate annealing between each cold rolling and a primary recrystallization annealing combined with decarburization annealing, applying annealing separator onto steel sheet surface, and subjecting steel sheet to finish annealing and a flattening annealing, a rapid cooling is conducted at an average cooling rate of not less than 200° C./s from 800° C. to 300° C. in cooling process from maximum achieving temperature in at least one of hot band annealing and intermediate annealing, whereby grain-oriented electrical steel sheet having excellent magnetic properties is stably produced.
    Type: Application
    Filed: April 22, 2020
    Publication date: February 10, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuiko EHASHI, Yukihiro SHINGAKI, Hirokazu SUGIHARA, Soshi YOSHIMOTO
  • Publication number: 20210310092
    Abstract: A thin steel sheet has a steel structure which has a ferrite area fraction of 30% or less, a bainite area fraction of 5% or less, a martensite and tempered martensite area fraction of 70% or more, and a retained austenite area fraction of 2.0% or less and in which the ratio of the dislocation density in the range of 0 ?m to 20 ?m from a surface of the steel sheet to the dislocation density of a through-thickness central portion of the steel sheet is 90% to 110% and the average of the top 10% of the sizes of cementite grains located in a depth of up to 100 ?m from a surface of the steel sheet is 300 nm or less. The maximum camber of the steel sheet sheared to a length of 1 m in a longitudinal direction of the steel sheet is 15 mm or less.
    Type: Application
    Filed: July 18, 2019
    Publication date: October 7, 2021
    Applicant: JFE Steel Corporation
    Inventors: Noriaki Kohsaka, Soshi Yoshimoto, Tomohiro Hashimukai, Takuya Hirashima
  • Publication number: 20210115546
    Abstract: A method for manufacturing a hot-dip metal plated steel strip having a plated layer formed on the outer surface thereof includes continuously immersing a steel strip in a bath tub that accommodates a molten metal plating bath, causing a sink roll disposed in the bath tub to change the traveling direction of the steel strip, then causing the steel strip to pass through two support rolls formed of a stabilizing roll and a correcting roll disposed above the sink roll but below the surface of the plating bath, and extracting the steel strip out of the bath. A flow regulation plate is disposed so as to cover at least the upper side of a roll body of the stabilizing roll out of the support rolls with a gap between the flow regulation plate and the stabilizing roll, and the flow of the molten metal plating bath directed toward a portion of the steel strip located from the exit of the support rolls to the surface of the plating bath is led toward the lower side of the stabilizing roll via the gap.
    Type: Application
    Filed: March 30, 2018
    Publication date: April 22, 2021
    Applicant: JFE Steel Corporation
    Inventors: Hironari Kawabata, Soshi Yoshimoto, Takahiko Itagaki
  • Patent number: 10844449
    Abstract: A rapid-cooling quenching apparatus in which a high-temperature metal sheet is dipped and cooled in a liquid and a rapid-cooling quenching method for a steel sheet are provided. The rapid-cooling quenching apparatus includes a water tank containing the liquid in which the metal sheet is dipped, a jetting device having a plurality of nozzles through which the liquid is jetted onto front and back surfaces of the metal sheet and at least some of which are placed in the liquid in the water tank, and a pair or a plurality of pairs of restraining rolls which are placed between an entrance-side end of the jetting device and an exit-side end of the jetting device and restrain the metal sheet, in which nozzles nearest to the restraining rolls are inclined toward the restraining rolls from a horizontal plane in the jetting device.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: November 24, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Soshi Yoshimoto, Hirokazu Sugihara, Fujio Tanaka, Tomohiro Hashimukai
  • Patent number: 10760144
    Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf?150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: September 1, 2020
    Assignee: JFE Steel Corporation
    Inventors: Soshi Yoshimoto, Masaru Miyake, Gentaro Takeda
  • Publication number: 20190161880
    Abstract: A method for manufacturing an electroplated steel sheet by continuously performing electroplating on a steel sheet, the method including disposing a slit gas nozzle having an ejection port having a width wider than a width of the steel sheet in a width direction of the steel sheet on a side of an exit of an electroplating cell for the steel sheet to pass through, and ejecting a gas through the slit gas nozzle toward the steel sheet.
    Type: Application
    Filed: June 1, 2017
    Publication date: May 30, 2019
    Applicant: JFE Steel Corporation
    Inventors: Gentaro Takeda, Yoshimichi Hino, Soshi Yoshimoto, Hideyuki Takahashi
  • Publication number: 20190010564
    Abstract: A rapid-cooling quenching apparatus in which a high-temperature metal sheet is dipped and cooled in a liquid and a rapid-cooling quenching method for a steel sheet are provided. The rapid-cooling quenching apparatus includes a water tank containing the liquid in which the metal sheet is dipped, a jetting device having a plurality of nozzles through which the liquid is jetted onto front and back surfaces of the metal sheet and at least some of which are placed in the liquid in the water tank, and a pair or a plurality of pairs of restraining rolls which are placed between an entrance-side end of the jetting device and an exit-side end of the jetting device and restrain the metal sheet, in which nozzles nearest to the restraining rolls are inclined toward the restraining rolls from a horizontal plane in the jetting device.
    Type: Application
    Filed: December 26, 2016
    Publication date: January 10, 2019
    Applicant: JFE Steel Corporation
    Inventors: Soshi Yoshimoto, Hirokazu Sugihara, Fujio Tanaka, Tomohiro Hashimukai
  • Publication number: 20170327926
    Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf?150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.
    Type: Application
    Filed: September 1, 2015
    Publication date: November 16, 2017
    Applicant: JFE STEEL CORPORATION
    Inventors: Soshi Yoshimoto, Masaru Miyake, Gentaro Takeda