TLS D5 is an air-hardening high-carbon high-chromium die steel. The addition of approximately 3% Co gives this steel extra resistance to galling and pickup and also provides additional red hardness, which is useful on semihot work applications. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on wear resistance as well as heat treating and machining. Filing Code: TS-647. Producer or source: Timken Latrobe Steel.