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Patent Searching and Data


Title:
HIGH-STRENGTH SPRING
Document Type and Number:
WIPO Patent Application WO/2012/017749
Kind Code:
A1
Abstract:
A high-strength spring is provided. A spring (2) disclosed in the present invention comprises a steel layer (12) and a nitride-containing compound layer (14) that is formed on the surface of the steel layer (12). The steel layer (12) contains, by mass%, 0.55 to 0.75 of C, 1.50 to 2.50 of Si, 0.30 to 1.00 of Mn, 0.80 to 2.00 of Cr, and 0.05 to 0.30 of W, with the remainder being iron and inevitable impurities. A carbide (16) that precipitates in the steel layer (12) has an average length of 0.12 µm or less and an average width of 0.04 µm or less.

Inventors:
MIMURA Shingo (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
三村 真吾 (〒05 愛知県名古屋市緑区鳴海町字上汐田68番地 中央発條株式会社内 Aichi, 〒4588505, JP)
Application Number:
JP2011/064165
Publication Date:
February 09, 2012
Filing Date:
June 21, 2011
Export Citation:
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Assignee:
CHUO HATSUJO KABUSHIKI KAISHA (68 Aza Kamishiota, Narumi-cho Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
中央発條株式会社 (〒05 愛知県名古屋市緑区鳴海町字上汐田68番地 Aichi, 〒4588505, JP)
MIMURA Shingo (68 Aza Kamishiota, Narumi-cho, Midori-ku, Nagoya-sh, Aichi 05, 〒4588505, JP)
International Classes:
C22C38/00; C22C38/34; F16F1/02; C21D1/06; C21D7/06; C21D9/02
Attorney, Agent or Firm:
KAI-U PATENT LAW FIRM (NISSEKI MEIEKI BUILDING 7F, 45-14 Meieki 2-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
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Claims: