I have a problem to find a good model of SUS304 mechanical behavior ( stress - strain curves ) at high temperatures ( from room temperature to 1500 celsius degree )
I still think, the Information you are looking for is in the graph. In the link you'll find additional information. The stress is given in SI units rather than psi. Apparently, the temperature behaviour also depends on the grain size of the material. Hope this helps, good luck.
Dehghan-Manshadi, A., et al. (2008). "Hot deformation and recrystallization of austenitic stainless steel: Part II. Post-deformation recrystallization." Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 39 A(6): 1371-1381.
Dehghan-Manshadi, A., et al. (2008). "Recrystallization in AISI 304 austenitic stainless steel during and after hot deformation." Materials Science and Engineering: A 485(1–2): 664-672.
In order to improve the understanding of the dynamic and post-dynamic recrystallization behaviours of AISI 304 austenitic stainless steel, a series of hot torsion test have been performed under a range of deformation conditions. The mechanical and microstructural features of dynamic recrystallization (DRX) were characterized to compare and contrast them with those of the post-dynamic recrystallization. A necklace type of dynamically recrystallized microstructure was observed during hot deformation at 900 °C and at a strain rate of 0.01 s−1. Following deformation, the dependency of time for 50% recrystallization, t50, changed from “strain dependent” to “strain independent” at a transition strain (ɛ*), which is significantly beyond the peak. This transition strain was clearly linked to the strain for 50% dynamic recrystallization during deformation. The interrelations between the fraction of dynamically recrystallized microstructure, the evolution of post-dynamically recrystallized microstructure and the final grain size have been established. The results also showed an important role of grain growth on softening of deformed austenite.