Refractor Telescope Construction In A 5" Refractor Telescope, Is There Really A Difference Between Tube Construction Steel Vs Aluminum?

In a 5" refractor telescope, is there really a difference between tube construction steel vs aluminum? - refractor telescope construction

The thermal expansion coefficient of steel is half of what is made of aluminum. When a certain temperature, when the steel is 11, then aluminum-23.1. Is this really a problem in the design of the telescope tube? I understand that 5% of aluminum is lighter.