... good toughness , broken less,high hardness metal ball widely used in cement building materials, metal mines, coal slurry thermal power, ... chemical engineering, ceramic coatings, light industry papermaking, magnetic materials, and other industries of powder ... ,φ60,φ70,φ80,φ90,φ100surface hardness: low alloy of metal ball HRC≥45 high alloy of metal ball HRC58-66