Interesting thread, made me think about a steam turbine I saw at a natural gas power plant in the laydown yard. From what I remember though, i believe it was some sort of alloy as well. Maker was GE though. One of the turbines was damaged in shipping and GE brought some Korean (where it was made/put together) engineer to look it over. The ended up installing it and it didn't even make it thru start-up trials. Something about balance issues. That thing had some huge blades though,,,