Spring steel excellent in sag resistance and fatigue property

Details Spring steel excellent in sag resistance and fatigue property Spring steel excellent in sag resistance and fatigue property

2004-03-25

2009-11-10

King, Roy (Department: 1793)

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

C148S333000

Reexamination Certificate

active

07615186

ABSTRACT:
The spring steel according to the present invention is a spring steel excellent in sag resistance and fatigue property containing: C: 0.5 to 0.8% by mass (hereinafter, referred to as %), Si: 1.2 to 2.5%, Mn: 0.2 to 1.5%, Cr: 1.0 to 4.0%, V: 0.5% or less (including 0%), P: 0.02% or less (excluding 0%), S: 0.02% or less (excluding 0%), Al: 0.05% or less (excluding 0%), and Fe and inevitable impurities as the balance, wherein the Si content and the Cr content satisfy the following formula (1):in-line-formulae description="In-line Formulae" end="lead"?0.8×[Si]+[Cr]≧2.6  (1)in-line-formulae description="In-line Formulae" end="tail"?(wherein, [Si] and [Cr] respectively represent the Si content (%) and the Cr content (%)).The spring steel is useful in improving both sag resistance and fatigue property.

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