Hello,
I have run into the problem where ALLOY 825 does not have published data for thermal expansion at -20F. I would like to get an idea of what others use when trying to run a model with this material for the MDMT temp of-20F. My thought is to just use the lowest value on the published list, but I am wondering if there is a better option or if anyone knows of a published document that shows the values below 200F.
Thanks

I am not sure if extrapolation can be used in this case.