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Thermal props of high tensile bolts

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Hi,

Does anyone know whether the thermal coefficient of expansion for a high
tensile bolt (UTS=1050 MPa, yield stress = 945 MPa) is any different to that
for mild steel?

I have a problem where an argument has been raised regarding the loss of
pre-tension in a torqued screw, where the screw is high tensile and the
components are mild steel.  The claim is that after heating the assembly to
130°C (266°F) for a couple of hours, the thermal differences in the two
steels causes significant loss of prestress.

Any comments?

Thanks,
Dave Meney
Structural Engineer

Yenem Engineering Services
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