Stirlingengineforum.com

Metal spinning can be accomplished using a wide variety of materials from soft tempered aluminum and copper to structural plate steel and stainless steels.

If it helps I just find a video on youtube related to this topic:

http://www.youtube.com/watch?v=kqQdQYOPSzk

BR
zhivko

Don't know about stainless, but brass , copper, and aluminium need frequent annealing. Ian S C