4)chemical industries 5)grinding mill, ball mill, coal mill Features of cast balls: 1) in general, high chrome casting grinding iron balls are famous for high hardness: surface hardness is to 60-68 hrc and volume hardness of 58-65 hrc; 2) high impact toughness: impact toughness is more than 12 j/cm2; 3) low broken rate: the actual broken rate is not higher than 1%; 4) wear-resistant: loss of grinding round rate is 80-500g/ton; Specification: 20-150mm Packing term 1) steel drums (with pallet): 850-900kg/drum 2)container bags: 1000kg/bag Steel drum or container bags