Quality Improvement in the Production Process of Grinding Ballsproperties such as heat flux, viscosity, and vaporizing temperature (Ruglic T, 1990). Air quenching has the minimum cooling rate as compared to water and oil. The production of cast grinding balls has seven steps which are segregation of scrap metal, melting, skimming and degassing, sand casting, heat treatment,.casting mill balls composition pdf,Paper 48:Paper 48 - Semantic ScholarSteel grinding media fail if there is a significant variation in chemical composition, hardness and microstructure of the balls. Common failure modes of grinding balls . 28 stainless steel, forged austenitic stainless steel, Ni-Hard,. 20% chromium, 27% chromium and 30% chromium white cast irons. By increasing the carbon.