A friend of mine is part of the Target team in IRL. He was still there back in the CART days when those cars used to have turbos. They use inconel exhaust manifolds on their cars extensively. The amount of heat and abuse these things can take is unbelieavable. They sometimes get so hot that they glow their own light and you can see through them. Still they don't crack. Those cars run ungondly sustained RPMs. This should tell you something about the strength of inconel.