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extrapolated CTE?

extrapolated CTE?

extrapolated CTE?

(OP)
hi,
I am looking for the CTE of SA-508a (stainless steel) at 0deg C.  From what I can tell, the ASME BPVC lists the CTE down to 20C.  We are not designing to the code, so can not justify the cost of purchasing it; that said, we would like to follow the rules as practical.

Does the ASME code have a policy for extrapolating?

thanks.
 

RE: extrapolated CTE?

You mean interpolate, not extrapolate, because ASME does not allow extrapolation of their published data outside of stated service temperature ranges. So, you can only use linear interpolation.

RE: extrapolated CTE?

(OP)
thanks, metengr

RE: extrapolated CTE?

I'm not sure that interpolation of CTE has to be linear. There's an interpretation that says interpolation of stress allowable has to be linear, but nothing I know of on CTE. When using the external pressure tables, the code says "linear interpolation or any other rational interpolation method may be used," so it's not a universal rule.

Stress is a biological mechanism that improves strength at the expense of thought. It is counter-productive to solving technological problems.

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