Patents by Inventor Toshiya NAKATA

Toshiya 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).

  • Ultra-high-strength steel sheet having excellent delayed fracture resistance at cut end thereof
    Patent number: 10526687
    Abstract: Provided is an ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 2 area% or more of a region having a structure that includes 90% or more of martensite and 0.5% or more of residual austentite by area ratio relative to the entire structure, the local Mn concentration in said region being at least 1.1 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: January 7, 2020
    Assignee: KOBE STEEL, LTD.
    Inventors: Kosuke Shibata, Toshiya Nakata, Toshio Murakami, Takahiro Ozawa, Fumio Yuse, Atsuhiro Shiraki, Kenji Saito, Yukihiro Utsumi
  • ULTRA-HIGH-STRENGTH STEEL PLATE HAVING EXCELLENT DELAYED FRACTURE RESISTANCE AT CUT END THEREOF
    Publication number: 20190153575
    Abstract: Provided is an ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 2 area % or more of a region having a structure that includes 90% or more of martensite and 0.5% or more of residual austentite by area ratio relative to the entire structure, the local Mn concentration in said region being at least 1.1 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more.
    Type: Application
    Filed: February 8, 2016
    Publication date: May 23, 2019
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Kosuke SHIBATA, Toshiya NAKATA, Toshio MURAKAMI, Takahiro OZAWA, Fumio YUSE, Atsuhiro SHIRAKI, Kenji SAITO, Yukihiro UTSUMI
  • ULTRA-HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT YIELD RATIO AND WORKABILITY
    Publication number: 20190032166
    Abstract: An ultra-high-strength steel sheet having a component composition that includes specific amounts of each of C, Si, Mn, and Al and a remainder of iron and unavoidable impurities, and in which the amounts of each of P, S, and N among the unavoidable impurities are limited to a specific amount. The ultra-high-strength steel sheet includes 1 area % or more of a region in which martensite constitutes 90 area % or more, residual austentite constitutes 0.5 area % or more, and the local Mn concentration is at least 1.2 times that of the Mn content of the entire steel sheet. The ultra-high-strength steel sheet has a tensile strength of 1470 MPa or more, a yield ratio of 0.75 or more, and a total elongation of 10% or more.
    Type: Application
    Filed: February 8, 2016
    Publication date: January 31, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kosuke SHIBATA, Toshiya NAKATA, Toshio MURAKAMI, Takahiro OZAWA, Fumio YUSE, Atsuhiro SHIRAKI, Kenji SAITO, Yukihiro UTSUMI