> Daniel Crowther wrote: > > I do not have any S-1, however I do have access to the following > > steels: A36, 5160, O-1, and automotive/truck engine valves. Which one of > > these would be my best choice? None of them will suffice. They are not engineered for hot work. H13 is an excellent hot work steel. S1 and S7 are also very good. S5 should do but it is designed more for cold work applications.