> My engineering training told me that steel is steel is steel when it
> comes to spring rate -- essentially the modulus of elasticity is 30
> million PSI, whether the material is 1020 or 4340. There are
> differences in fatigue limits and tensile strength, but the
> springiness itself is very nearly constant.
Could be you're right. My information is that Young's modulus can vary
appreciably, for example 316 stainless is only 28000 ksi; while 4140
chrome-moly is 33000 ksi. Actually, we're more interested in the modulus in
torsion, but it varies by a similar amount.
Randall
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