Crucible S7 XL is a double-refined high-purity grade of S7 tool steel (see Alloy Digest TS-543, July 1996) designed specifically for ease of wire electrical discharge machining (EDM) operations, improved consistency in texturizing of plastic injection molds, and superior shock resistance compared to conventional S7. Typical applications include plastic injection molds, punches and dies by wire EDM, and heavy impact tools. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on wear resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: TS-562. Producer or source: Crucible Service Centers. Originally published November 1998, revised 2005.