SK7 is 0.6 carbon, high carbon steel belt, used after quench hardening, SK7 abrasion resistance is good, and the price is cheaper tool steels. Suitable for sliding parts need high hardness of components and parts of cold work dies. Sk7 materials commonly used in need of elastic parts, stamping features with (SPCC), strong hardness and rebound slightly, stamping again after heat treatment, usually in order to achieve the required hardness and elasticity.