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What to do if operating in the ellipsis area of 31.3 App. A?

What to do if operating in the ellipsis area of 31.3 App. A?

What to do if operating in the ellipsis area of 31.3 App. A?

(OP)
I am doing some stress analyses of liquid N2 and O2 cryogenic systems.  The material is A312 TP304.  The required analysis temperature is -420° F.  (Don't ask...).

This particular material has basic S values tabulated down to -425°.  However, the tabulated alpha value in Table C-3 only goes down to -325°.  Is there any reason I can't determine the alpha for my temperature using linear regression (extrpolation) of the other alphas and temperatures listed in Table C-3?

Thanks!
Pete

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