AISI Type S1 is a chromium-tungsten alloy steel for general use for chisels and other cold-battering tools. Its great toughness and strength also enable it to handle many hot and cold-work tooling jobs. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-246. Producer or source: Tool steel mills.