How does the NASTRAN NX material library address material temperature? Even if there actually IS a separately named file for each temper and form of each alloy (that’s a lot of files and a lot of complex naming), the reality is still that many of the most important material properties (Elastic Modulus, Shear Modulus, thermal expansion, specific heat, etc) are dependent on temperature.
The answer I am expecting (but would like confirmed) is that any temperature-dependent material property is left empty in the library files. It is up to the analyst to fill-in that data within the model per the needs of their particular analysis. Ergo, any and all materials added to a model from the library become independent from the library once they are added.