Patents by Inventor Akari Tamaki

Akari Tamaki 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).

  • Steel sheet for hot stamping, method of manufacturing the same, and hot stamped steel sheet member
    Patent number: 10570470
    Abstract: A steel sheet for hot stamping includes a predetermined chemical composition containing: C: 0.08% or more and less than 0.20%; Si: 0.003% to 0.2%; Mn: 1.6% to 3.5%, and others, and further includes a steel structure expressed by, in an area ratio: bainite: 1% to 95%; ferrite: 5% to 94%; and balance: one or more selected from the group consisting of pearlite, martensite and retained austenite. When an Mn content is represented by [Mn], a C content is represented by [C], an expression of “[Mn]+6.67×[C]?2.73?0” is satisfied.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: February 25, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Akari Tamaki, Kazuo Hikida
  • STEEL SHEET FOR HOT STAMPING, METHOD OF MANUFACTURING THE SAME, AND HOT STAMPED STEEL SHEET MEMBER
    Publication number: 20150284819
    Abstract: A steel sheet for hot stamping includes a predetermined chemical composition containing: C: 0.08% or more and less than 0.20%; Si: 0.003% to 0.2%; Mn: 1.6% to 3.5%, and others, and further includes a steel structure expressed by, in an area ratio: bainite: 1% to 95%; ferrite: 5% to 94%; and balance: one or more selected from the group consisting of pearlite, martensite and retained austenite. When an Mn content is represented by [Mn], a C content is represented by [C], an expression of “[Mn]+6.67×[C]?2.73?0” is satisfied.
    Type: Application
    Filed: August 15, 2013
    Publication date: October 8, 2015
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Akari Tamaki, Kazuo Hikida
  • STEEL SHEET
    Publication number: 20150225821
    Abstract: In a steel sheet, a cleanliness of a metal structure is 0.08% or less, a which is an Mn segregation degree is 1.6 or less, and a difference ?Hv between a low strain formed portion that undergoes a plastic strain of 5% or less and a high strain formed portion that undergoes a plastic strain of 20% or higher in a hot forming in average hardness after the hot forming is 40 or less.
    Type: Application
    Filed: August 28, 2013
    Publication date: August 13, 2015
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazuo Hikida, Akari Tamaki, Nobusato Kojima, Masaru Takahashi