Steel wire rod for hard drawn spring, drawn wire rod for...

Details Steel wire rod for hard drawn spring, drawn wire rod for... Steel wire rod for hard drawn spring, drawn wire rod for...

2006-07-11

2006-07-11

Mai, Ngoclan T. (Department: 1742)

Metal treatment

Stock

Ferrous

C148S336000, C148S230000, C148S318000, C148S580000

Reexamination Certificate

active

07074282

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):in-line-formulae description="In-line Formulae" end="lead"?Rp(area %)≧55×[C]+61  (1)in-line-formulae description="In-line Formulae" end="tail"?where [C] denotes the content (mass %) of carbon.

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