Hi Peter, 

thanks for your answer!

I dont have the same result.

I only have the same result when changing the youngs modulus at part temperature/thermal condition (20 °C).

I modified structural steel by adding a lower modulus for 120 °C:

Temperature dependent:

My project looks like this:

For the material with the constant youngs modulus and the temperature dependent youngs modulus it is the same result:

As said before: When I change the youngs modulus at 20 °C, there is a change. The youngs modulus at 120 °C does not influence the results.
Am I doing a mistake or what is the reason?