... ,good toughness , broken less,high hardness metal ball widely used in cement building materials, metal mines, coal slurry thermal power, chemical engineering ... , wear low, good toughness and broken less, in use process sphere surface hardness, wear resistance enhancement will be further improved, and ... ,φ50,φ60,φ70,φ80,φ90,φ100surface hardness: low alloy of metal ball HRC≥45 high alloy of ...