LSS H13 is a hot work tool steel with versatility. It has hot strength, toughness, and thermal fatigue resistance. This datasheet supersedes Alloy Digest TS-688, April 2010. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-708. Producer or source: Latrobe Specialty Steel Company.