Materials for Spring

From M
       Material for Helical Springs:         Authors: R.S. KHURMI    J.K. GUPTA

The material of the spring should have high fatigue strength, high ductility, high resilience and
it should be creep resistant. It largely depends upon the service for which they are used i.e. severe
service, average service or light service.

Severe service means rapid continuous loading where the ratio of minimum to maximum
load (or stress) is one-half or less, as in automotive valve springs.
 Average service includes the same stress range as in severe service but with only intermittent
operation, as in engine governor springs and automobile suspension springs.

Light service includes springs subjected to loads that are static or very infrequently varied, as in
safety valve springs.
The springs are mostly made from oil-tempered carbon steel wires containing 0.60 to 0.70 per
cent carbon and 0.60 to 1.0 per cent manganese. Music wire is used for small springs. Non-ferrous
materials like phosphor bronze, beryllium copper, monel metal, brass etc., may be used in special
cases to increase fatigue resistance, temperature resistance and corrosion resistance.
DESIGN OF MACHINE ELEMENTS, DIPLOMA MACHINE DESIGN
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