CRUCIBLE HOLDER BLOCK is a medium-carbon chromium-molybdenum steel which affords superior machinability because of its sulfur content. It is used in such applications as holders or backers for forging dies and frames for plastic molds. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-301. Producer or source: Crucible Specialty Metals Division, Colt Industries.