VASCO SUPREME is a high carbon, cobalt type of high-speed steel combining very high hardness, hot-hardness, wear resistance and toughness. It possesses performance qualities surpassing those of commonly used grades of high-speed steel. This datasheet provides information on composition and hardness as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, and machining. Filing Code: TS-4. Producer or source: Vanadium Alloys Steel Company. Originally published January 1953, revised May 1962.