Steam Turbines take 20 titanium, 50 copper, 50 gears, and 20 pipes and scrap into (according to the factoriopedia) 12-13 gears, 12-13 copper, 5 pipes, and no titanium.
This creates a problem when using the Cerys moon mod, as you have to make superconductors (which now require titanium) and I cannot see any other way to get titanium on that planet other than scrapping (mined) steam turbines.