Patents by Inventor Shinjiro Kaneko

Shinjiro Kaneko 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: 20220372590
    Abstract: The steel sheet of the present invention has a steel microstructure containing, in area fraction, martensite: from 20% to 100%, ferrite: from 0% to 80%, and another metal phase: 5% or less, and in which a ratio of a dislocation density in metal phases on a surface of the steel sheet to a dislocation density in the metal phases in a thicknesswise central portion of the steel sheet is from 30% to 80%. The maximum amount of warpage of the steel sheet when the steel sheet is sheared to a length of 1 m in a rolling direction is 15 mm or less.
    Type: Application
    Filed: October 23, 2020
    Publication date: November 24, 2022
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Shimpei Yoshioka, Shinjiro Kaneko, Soshi Yoshimoto, Tomohiro Hashimukai
  • Publication number: 20220364198
    Abstract: The steel sheet of the present invention has a steel microstructure containing, in area fraction, martensite: 20% to 100%, ferrite: 0% to 80%, and another metal phase: 5% or less, in which, on a surface of the steel sheet, a ratio of dislocation density in metal phases at a widthwise edge of the steel sheet to dislocation density in the metal phases at a widthwise center of the steel sheet is 100% to 140%, and, at a thicknesswise center of the steel sheet, a ratio of dislocation density in the metal phases at the widthwise edge of the steel sheet to dislocation density in the metal phases at the widthwise center of the steel sheet is 100% to 140%. The maximum amount of warpage of the steel sheet when the steel sheet is sheared to a length of 1 m in a rolling direction is 15 mm or less.
    Type: Application
    Filed: October 23, 2020
    Publication date: November 17, 2022
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Shimpei Yoshioka, Shinjiro Kaneko, Soshi Yoshimoto, Tomohiro Hashimukai
  • 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: 20220282353
    Abstract: The high strength steel sheet of the present invention has a specific chemical composition, and contains, in terms of area fraction relative to an entire steel microstructure, 30% or more and 100% or less ferrite, 0% or more and 70% or less martensite, and less than 20% in total of pearlite, bainite and retained austenite, and the ferrite contains, in terms of area fraction relative to an entire microstructure, 0% or more and 10% or less non-recrystallized ferrite, with a difference of the area fraction of the non-recrystallized ferrite in the longitudinal direction of the steel sheet of 5% or smaller.
    Type: Application
    Filed: July 29, 2020
    Publication date: September 8, 2022
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Yu Hashimoto, Shinjiro Kaneko, Yoshihiko Ono
  • Publication number: 20220275469
    Abstract: The high strength steel sheet of the present invention has a specific chemical composition, and contains, in terms of area fraction relative to an entire steel microstructure, 30% or more and 100% or less ferrite, 0% or more and 70% or less martensite, and less than 20% in total of pearlite, bainite and retained austenite, a total content of Nb and Ti contained in a precipitate having a particle size of smaller than 20 nm is 25 mass ppm or more and 220 mass ppm or less, and the difference between the maximum value and the minimum value of the total content of Nb and Ti contained in the precipitate having a particle size of smaller than 20 nm, in the longitudinal direction of the steel sheet, is smaller than 20 mass ppm.
    Type: Application
    Filed: July 29, 2020
    Publication date: September 1, 2022
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Yu Hashimoto, Shinjiro Kaneko, Yoshihiko Ono
  • Patent number: 11408044
    Abstract: There is provided a high-strength steel sheet and a method for producing the same. The high-strength steel sheet has a specified chemical composition and a steel microstructure including, by area fraction, 75.0% or more tempered martensite, 1.0% or more and 20.0% or less fresh martensite, and 5.0% or more and 20.0% or less retained austenite. A hardness ratio of the fresh martensite to the tempered martensite is 1.5 or more and 3.0 or less, the ratio of the maximum KAM value in the tempered martensite in the vicinity of the heterophase interface between the tempered martensite and the fresh martensite to the average KAM value in the tempered martensite is 1.5 or more and 30.0 or less, and the average of ratios of grain sizes of prior austenite grains in the rolling direction to those in the thickness direction is 2.0 or less.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: August 9, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Fusae Shiimori, Shinjiro Kaneko, Takashi Kobayashi, Yuji Tanaka
  • Patent number: 11408058
    Abstract: There is provided a high-strength steel sheet and a method for producing the same. The steel sheet has a specified chemical composition and a microstructure including, in terms of area percentage, 20.0% or more and 60.0% or less ferrite, 40.0% or more and 80.0% or less of a hard phase composed of bainitic ferrite, tempered martensite, fresh martensite, and retained austenite, 35.0% or more and 55.0% or less bainitic ferrite with respect to the entire hard phase, 20.0% or more and 40.0% or less tempered martensite with respect to the entire hard phase, 3.0% or more and 15.0% or less fresh martensite with respect to the entire hard phase, and 5.0% or more and 20.0% or less retained austenite with respect to the entire hard phase.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: August 9, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Takashi Kobayashi, Shinjiro Kaneko, Yuji Tanaka
  • Patent number: 11401595
    Abstract: A high-strength steel sheet having a TS of 780 MPa or more, excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20% or more and 50% or less, lower bainite: 5% or more and 40% or less, martensite: 1% or more and 20% or less, and tempered martensite: 20% or less, and including, in volume fraction, retained austenite: 5% or more, the retained austenite having an average grain size of 2 ?m or less; and a texture having an inverse intensity ratio of ?-fiber to ?-fiber of 3.0 or less.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: August 2, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Shinjiro Kaneko, Reiko Sugihara, Kazunori Tahara, Kazuma Mori
  • Publication number: 20220220577
    Abstract: A high strength member according to the present invention is the high strength member having a bending ridge line portion formed from a steel sheet, the member having a tensile strength of 1470 MPa or higher, a residual stress of 300 MPa or lower in an end surface of the bending ridge line portion, and a Vickers hardness (HV) of 200 or higher and 450 or lower in the end surface of the bending ridge line portion.
    Type: Application
    Filed: May 12, 2020
    Publication date: July 14, 2022
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Shinjiro Kaneko
  • Publication number: 20220098698
    Abstract: A high-strength steel sheet having a low yield ratio and a method for producing the same. The high-strength steel sheet has a specified chemical composition and a microstructure in which ferrite is present as a major phase, and martensite is present in an area fraction of 10% or greater and less than 50% relative to an entire area of the microstructure. The martensite has an average grain diameter of 3.0 ?m or less, in an entirety of the martensite, a proportion of martensite having an aspect ratio of 3 or less is 60% or greater, and the martensite having an aspect ratio of 3 or less has a carbon concentration of 0.30% or greater and 0.90% or less in mass %.
    Type: Application
    Filed: December 19, 2019
    Publication date: March 31, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Takuya HIRASHIMA, Yuma HONDA, Akinori NAKAMURA, Shinjiro KANEKO
  • Publication number: 20220010397
    Abstract: A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure comprising ferrite: 5% or less, and at least one of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained ?: 95% to 100%, and retained ?: 5% to 20%. Retained ?UB has a specified area percentage S?UB, retained ?LB has a specified distribution number N?LB, and at least one of (i) fresh martensite has a specified equivalent circular grain diameter and aspect ratio and (ii) retained ? grains has a specified equivalent circular grain diameter and aspect ratio.
    Type: Application
    Filed: October 16, 2019
    Publication date: January 13, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Yoshihiko ONO, Junya TOBATA, Hiroyuki AKIMOTO, Yoichiro MATSUI, Shinjiro KANEKO
  • Publication number: 20220010414
    Abstract: A high-strength member having excellent delayed fracture resistance, a method for manufacturing the high-strength member, and a method for manufacturing a steel sheet for the high-strength member. The high-strength member has a bent ridge portion obtained by using a steel sheet having a tensile strength of 1470 MPa or more, an edge surface of the bent ridge portion has a residual stress of 800 MPa or less, and a longest crack among cracks that extend from the edge surface of the bent ridge portion in a bent ridge direction D1 has a length of 10 ?m or less.
    Type: Application
    Filed: September 25, 2019
    Publication date: January 13, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Takuya HIRASHIMA, Shimpei YOSHIOKA, Shinjiro KANEKO
  • Publication number: 20220002827
    Abstract: A high-strength steel sheet having high delayed fracture resistance and a method for manufacturing the high-strength steel sheet. The high-strength steel sheet has a specified chemical composition. Relative to the whole microstructure of the steel sheet, the total area fraction of at least one of (i) bainite containing carbide grains having an average grain size of 50 nm or less and (ii) martensite containing carbide grains having an average grain size of 50 nm or less is 90% or more. The average number of inclusions having an average grain size of 5 ?m or more that are present in a section of the steel sheet perpendicular to a rolling direction is 5.0/mm2 or less.
    Type: Application
    Filed: September 25, 2019
    Publication date: January 6, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Takuya HIRASHIMA, Shimpei YOSHIOKA, Shinjiro KANEKO
  • Publication number: 20220002832
    Abstract: A production method for a high-strength steel sheet having a tensile strength TS of 780 MPa or more is provided. The production method comprises: heating a steel slab having a predetermined chemical composition; hotrolling the steel slab; coiling the hot-rolled sheet; subjecting the hot-rolled sheet to pickling treatment; holding the hot-rolled sheet in a pre-determined temperature range for predetermined time; cold rolling the hot-rolled sheet to obtain a cold-rolled sheet; subjecting the cold-rolled sheet to first annealing treatment; cooling the cold-rolled sheet at a pre-determined average cooling rate; cooling the cold-rolled sheet to room temperature; reheating the clod-rolled sheet to perform second annealing treatment; cooling the cold-rolled sheet at a first average cooling rate; cooling the cold-rolled sheet at a second average cooling rate; reheating the cold-rolled sheet to a predetermined reheating temperature range; and holding the cold-rolled sheet in the reheating temperature range.
    Type: Application
    Filed: September 17, 2021
    Publication date: January 6, 2022
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Shinjiro KANEKO
  • Publication number: 20210381077
    Abstract: A thin steel sheet has a specific chemical composition. The thin steel sheet has a microstructure in which ferrite is present in an area fraction of 4% or less (including 0%), as-quenched martensite is present in an area fraction of 10% or less (including 0%), retained austenite is present in an amount of 7% or more and 20% or less, and upper bainite, lower bainite, and tempered martensite are present in a total area fraction of more than 71% and less than 93%; and BCC iron that has a misorientation of 1° or less and surrounds retained austenite having an equivalent circular diameter of 1 ?m or less is present in an area fraction of 4% or more and 50% or less, and BCC iron that has a misorientation of more than 1° is present in an area fraction of 25% or more and 85% or less.
    Type: Application
    Filed: October 15, 2019
    Publication date: December 9, 2021
    Applicant: JFE Steel Corporation
    Inventors: Noriaki Kohsaka, Junya Tobata, Shinjiro Kaneko, Yasushi Kitani, Yoshihiko Ono, Tadachika Chiba
  • Publication number: 20210381076
    Abstract: A thin steel sheet has a specific chemical composition. The thin steel sheet has a microstructure in which ferrite is present in an area fraction of 5% or more and 60% or less, as-quenched martensite is present in an area fraction of 10% or less (including 0%), retained austenite is present in an area fraction of 5% or more and 20% or less, and upper bainite, lower bainite, and tempered martensite are present in a total area fraction of more than 15% and less than 85%; BCC iron that has a misorientation of 1° or less and surrounds retained austenite having an aspect ratio of 2.5 or higher is present in an area fraction of 5% or more and 70% or less; and a top 10% of retained austenite in terms of an equivalent circular diameter has an average aspect ratio of 2.5 or higher.
    Type: Application
    Filed: October 15, 2019
    Publication date: December 9, 2021
    Applicant: JFE Steel Corporation
    Inventors: Noriaki Kohsaka, Shinjiro Kaneko, Akinori Nakamura, Yuma Honda, Tadachika Chiba, Yoshihiko Ono
  • Publication number: 20210355559
    Abstract: A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure comprising ferrite: 5% or less, and at least one of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained ?: 95% to 100% by area percentage, and retained ?: 4% to 15% by volume percentage. Retained ?UB has a specified area percentage S?UB, retained ?LB has a specified distribution number N?LB, and at least one of (i) fresh martensite has a specified equivalent circular grain diameter and aspect ratio and (ii) retained ? grains has a specified equivalent circular grain diameter and aspect ratio.
    Type: Application
    Filed: October 16, 2019
    Publication date: November 18, 2021
    Applicant: JFE STEEL CORPORATION
    Inventors: Yoshihiko ONO, Junya TOBATA, Hiroyuki AKIMOTO, Yoichiro MATSUI, Shinjiro KANEKO
  • Publication number: 20210324504
    Abstract: A high-ductility, high-strength electrolytic zinc-based coated steel sheet includes an electrolytic zinc-based coating on a base steel sheet, in which the base steel sheet has a predetermined composition and a steel microstructure in which the total area percentage of one or two of martensite containing a carbide having an average particle size of 50 nm or less and bainite containing a carbide having an average particle size of 50 nm or less is 90% or more in the entire steel microstructure, the total area percentage of one or two of the martensite containing a carbide having an average particle size of 50 nm or less and the bainite containing a carbide having an average particle size of 50 nm or less is 80% or more in a region extending from the surface of the base steel sheet to a depth of ? of the thickness of the base steel sheet.
    Type: Application
    Filed: August 6, 2019
    Publication date: October 21, 2021
    Applicant: JFE Steel Corporation
    Inventors: Takuya Hirashima, Shinjiro Kaneko
  • Patent number: 11098392
    Abstract: A hot rolled steel sheet having a chemical composition containing, by mass %, C: 0.04% or more and 0.20% or less, Si: 0.7% or more and 2.3% or less, Mn: 0.8% or more and 2.8% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.1% or less, N: 0.008% or less, and the balance being Fe and inevitable impurities. The microstructure of the hot rolled steel sheet includes ferrite and pearlites, in which the area ratio of the ferrite is 75% or more and less than 95%, the mean grain size of the ferrite is 5 ?m or more and 25 ?m or less, the area ratio of pearlite is 5% or more and less than 25%, the mean grain size of pearlite is 2.0 ?m or more, and the mean free path of pearlite is 5 ?m or more.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: August 24, 2021
    Assignee: JFE Steel Corporation
    Inventors: Yoshiyasu Kawasaki, Shinjiro Kaneko, Yasunobu Nagataki
  • Patent number: 11078552
    Abstract: A high-strength steel sheet exhibiting excellent ductility and stretch-flangeability, and a method for manufacturing such a high-strength steel sheet. The high-strength steel sheet has a chemical composition including specific proportions of components in which C/Mn is 0.08 to 0.20, the balance being iron and inevitable impurities, and includes microstructures including, in terms of area fraction relative to all the microstructures, 40% to 70% total of ferrite and bainitic ferrite, 5% to 35% martensite and 5% to 30% retained austenite. The proportion of martensite (including retained austenite) adjacent to bainitic ferrite is not less than 60% of all martensite (including retained austenite). The proportion of 4.0 GPa and smaller differences in microhardness measured at 0.5 ?m intervals is not less than 70%. The proportion of microstructures with 8.0 GPa or smaller microhardness is not less than 85% of all the microstructures.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: August 3, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Fusae Shiimori, Shinjiro Kaneko, Yasunobu Nagataki