LSS H13 is a hot-work tool steel with excellent impact toughness. It is widely used in both hot-work and cold-work tooling applications. (See updated datasheet Alloy Digest TS-708, October 2012.) This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-688. Producer or source: Latrobe Specialty Steel Company.