... wear low,good toughness , broken less,high hardness metal ball widely used in cement building materials, metal mines, coal slurry thermal power, chemical engineering ... , best-selling domestic 31 provinces, cities and autonomous regions over 2,000 enterprise, and exported to Japan, South Korea, USA, ... ,φ60,φ70,φ80,φ90,φ100surface hardness: low alloy of metal ball HRC≥45 high alloy of metal ball HRC58-66