I dont think change in E alone can be used to 1-for-1 compared the change in Yeild/UTS. However, buckling is entirely determined by geometry and stiffness (E). Reducing E would drastically increase sustainability to buckling.
Edit: stuff after.
Okay so in you example structural steel around 500c is around half the strength, but its not always the case and does not directly correlate to E. For example at around 300c the strength increases.
I dont think change in E alone can be used to 1-for-1 compared the change in Yeild/UTS. However, buckling is entirely determined by geometry and stiffness (E). Reducing E would drastically increase sustainability to buckling.
Edit: stuff after.
Okay so in you example structural steel around 500c is around half the strength, but its not always the case and does not directly correlate to E. For example at around 300c the strength increases.
https://www.engineeringtoolbox.com/amp/metal-temperature-strength-d_1353.html