LESCO S-7 is an air or oil-hardening die steel with a unique combination of toughness and wear-resistance properties that makes it an ideal choice for many tooling applications. The outstanding properties of Lesco S-7 are provided by an intermediate carbon level balanced with moderate amounts of chromium and molybdenum. It is used for both cold and hot tooling applications. Its many uses include shear blades, swaging dies, chisels and dies for molding plastics below 1000 F (538 C). This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, joining, and surface treatment. Filing Code: TS-437. Producer or source: Latrobe Steel Company.