... toughness , broken less,high hardness metal ball widely used in cement building materials, metal mines, coal slurry thermal power, chemical engineering, ceramic coatings ... and broken less, in use process sphere surface hardness, wear resistance enhancement will be further improved, and can improve grinding machine ... 50,φ60,φ70,φ80,φ90,φ100surface hardness: low alloy of metal ball HRC≥45 high alloy of ...