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US 9,068,615 B2Granted
Spring having excellent corrosion fatigue strength
AssigneeChuo Hatsujo Kabushiki Kaisha
InventorsTakanori Kuno, Masami Wakita
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Abstract
A spring has a Rockwell hardness of HRC 53 to HRC 56 and a dislocation density ρ (cm−2) that satisfies the formula ρ≧1.4×1011×H−6.7×1012 in the Rockwell hardness range of HRC 53 to HRC 56, in which H is the Rockwell hardness. The spring also has a prior austenite grain size number of 10 or higher.
Claims20
A spring, which exhibits:
- a Rockwell hardness of HRC 53 to HRC 56,
- a dislocation density ρ (cm−2)that satisfies the following Formula (1) in the Rockwell hardness range of HRC 53 to HRC 56:
- (1) ρ≧1.4×1011×H−6.7×1012, wherein H is the Rockwell hardness;
- and
- a prior austenite grain size number that is not less than 10.
2 more elements
A steel coil spring having the following properties:
- a Rockwell hardness of HRC 53 to HRC 56;
- a dislocation density ρ (cm−2)that satisfies the formula ρ≧1.4×1011×H−6.7×1012 in the Rockwell hardness range of HRC 53 to HRC 56, wherein H is the Rockwell hardness;
- and
- a prior austenite grain size number of 10 or higher.
1 more element
Dependencies are inferred from the claim text.