Title:
高強度ばね用鋼線
Document Type and Number:
Japanese Patent JP5591130
Kind Code:
B2
Abstract:
High strength steel wire for spring containing, by mass%, C: 0.67% to less than 0.75%, Si: 2.0 to 2.5%, Mn: 0.5 to 1.2%, Cr: 0.8 to 1.3%, V: 0.03 to 0.20%, Mo: 0.05 to 0.25%, W: 0.05 to 0.30%, and N: 0.003 to 0.007%, having a total of contents of Mn and V of 0.70%‰¤Mn+V‰¤1.27% and a total of contents of Mo and W of 0.13%‰¤Mo+W‰¤0.35%, limiting P: 0.025% or less, S: 0.025% or less, and Al: 0.003% or less, and having a balance of iron and unavoidable impurities, having a microstructure comprised of, by volume percent, over 6% to 15% of retained austenite and tempered martensite, having a prior-austenite grain size number of 10 or more, having a density of presence of spheroidal carbides with a circle equivalent diameter of 0.2 to 0.5 µm of 0.06 particles/µm 2 or less, having a density of presence of spheroidal carbides with a circle equivalent diameter of over 0.5 µm of 0.01 particles/µm 2 or less, and having a tensile strength of 2100 to 2350 MPa.
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Inventors:
Masayuki Hashimura
出町 仁
金須 Takayuki
Shoichi Suzuki
Suehiro Tomonobu
Kawaguchi Pure
Keiichi Maekawa
Murakami 敦
出町 仁
金須 Takayuki
Shoichi Suzuki
Suehiro Tomonobu
Kawaguchi Pure
Keiichi Maekawa
Murakami 敦
Application Number:
JP2010550389A
Publication Date:
September 17, 2014
Filing Date:
July 09, 2010
Export Citation:
Assignee:
The NSC 住金, Inc.
Suzuki Metal Industry Co., Ltd.
Honda Motor Co., Ltd.
Suzuki Metal Industry Co., Ltd.
Honda Motor Co., Ltd.
International Classes:
C22C38/00; C22C38/34; C21D8/06
Foreign References:
| WO2007114491A1 | 2007-10-11 |
Attorney, Agent or Firm:
Aoki 篤
Ishida 敬
Tetsuji Koga
亀松 宏
Nakamura Tomoyuki
Tomoyasu Nagasaka
Ishida 敬
Tetsuji Koga
亀松 宏
Nakamura Tomoyuki
Tomoyasu Nagasaka