AL Tech D-5 is a high-carbon, high-chromium tool and die steel; it contains cobalt (3.30%) and is air-hardening and nondeforming. The cobalt impacts a pronounced secondary hardening effect in tempering and a non-galling effect. AL Tech D-5 has both superior abrasion resistance and greater edge strength than ordinary high-carbon, high-chromium die steels. It is used for many types of dies, hot-piercing punches and shear blades. This datasheet provides information on composition, physical properties, and hardness as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-372. Producer or source: AL Tech Specialty Steel Corporation.