... used for the following equipment including rotary barrel shot blasting machine, 1. Production specification: S390,S780, S660, S550, S460, S390, S330, ... Special: 52-56HRC, 56-60HRC Density: 7.4g/cucm4. steel shot is used for industrial foundry, forging plant, heat treatment shop ... : Tempered Marten site High strength, durable Ervin life: Cast steel shot: 2000 cycles