Patents Assigned to Shinko Wire Co., Ltd.
  • Publication number: 20160160306
    Abstract: To provide a coil spring having excellent fatigue resistance. Disclosed is a coil spring made of steel, including (in % by mass, the same shall apply for a chemical composition): C: 0.40 to 0.70%; Si: 1.50 to 3.50%; Mn: 0.30 to 1.50%; Cr: 0.10 to 1.50%; V: 0.50 to 1.00%, and Al: 0.01% or less (excluding 0%), with the balance being iron and inevitable impurities, wherein an average crystal grain size number of prior austenite crystals in a depth of 0.3 mm from a surface is 11.0 or more, while a difference in grain size number between the respective prior austenite crystals is in a range of less than 3 from a grain size number observed at the maximum frequency, and wherein a carburized layer is provided in a depth of 0.30 to 1.00 mm from the surface, while an average Vickers hardness is 600 or higher at a position in a depth of (¼)×diameter in the depth direction from the surface.
    Type: Application
    Filed: July 8, 2014
    Publication date: June 9, 2016
    Applicants: NHK Spring Co., Ltd., Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Shinko Wire Co., Ltd.
    Inventors: Fumio YAMAMOTO, Kengo TSURUGAI, Nao YOSHIHARA, Kei MASUMOTO, Hiroshi OURA, Tetsuo JINBO, Toshio MAEHATA, Yoshiharu YAMAMOTO
  • Patent number: 8007716
    Abstract: A steel wire has tempered martensite, comprises, as essential components, by mass, C: 0.53 to 0.68%; Si: 1.2 to 2.5%; Mn: 0.2 to 1.5%; Cr: 1.4 to 2.5%; Al: 0.05% or less; further comprises, as a selective component, Ni: 0.4% or less; V: 0.4% or less; Mo: 0.05 to 0.5%; or Nb: 0.05 to 0.5%; and further comprises remainder essentially consisting of Fe and inevitable impurities, wherein the grain size number of prior austenite is 11.0 or larger, and the proof stress ratio (?0.2/?B), namely, a ratio of 0.2% proof stress (?0.2) to tensile strength (?B) is 0.85 or lower. Satisfying the above requirements makes it possible to produce a steel wire for high-strength spring excellent both in workability (cold workability), and in sag resistance and fatigue properties.
    Type: Grant
    Filed: March 25, 2004
    Date of Patent: August 30, 2011
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, NHK Spring Co., Ltd., Shinko Wire Co., Ltd.
    Inventors: Sumie Suda, Nobuhiko Ibaraki, Noritoshi Takamura, Naoki Terakado, Satoru Tendo, Tadayoshi Fujiwara, Tetsuo Jinbo
  • Patent number: 7074282
    Abstract: Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon in a range from 1.4 to 2.5 mass %, manganese in a range from 0.5 to 1.5 mass %, chromium in a range from 0.05 to 2.0 mass %, and vanadium in a range from 0.05 to 0.40 mass %, and has an area ratio Rp with respect to pearlite which satisfies the mathematical expression (1): Rp(area %)?55×[C]+61??(1) where [C] denotes the content (mass %) of carbon.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: July 11, 2006
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, NHK Spring Co., Ltd., Shinko Wire Co., Ltd.
    Inventors: Nobuhiko Ibaraki, Atushi Inada, Sumie Suda, Noritoshi Takamura, Satoru Tendoh, Tadayoshi Fujiwara, Tetsuo Jinbo