Patents Assigned to NHK SPING CO., LTD.
  • HOLLOW SEAMLESS PIPE FOR HIGH-STRENGTH SPRING
    Publication number: 20150285410
    Abstract: A hollow seamless pipe for a high-strength spring in the present invention includes a steel material in which chemical component compositions are properly adjusted, wherein a depth of a whole decarburized layer in an inner surface layer part is 100 ?m or less, a depth of a flaw which is present in an inner surface is 40 ?m or less, a width of the flaw is 60 ?m or less, and a number density of a carbide which has a circle equivalent diameter of 500 nm or more and is present in the inner surface layer part is 1.8×10?2 particles/?m2 or less.
    Type: Application
    Filed: April 2, 2013
    Publication date: October 8, 2015
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD), SHINKO METAL PRODUCTS CO., LTD., NHK SPING CO., LTD.
    Inventors: Takuya Kochi, Hitoshi Hatano, Eiichi Tamura, Kotaro Toyotake, Takashi Yajima, Akira Tange