chrome steel ball: characteristics:1,high hardness; No of employee:100-150 people Qualification:ISO9002 system Our main products: a,cast grinding ball, b,grinding media steel ball, c,forged steel ball, d,high chrome rare-earth alloy steel ballA)Diameter: 20mm-150mm ballsB)charateristics:1) high hardness 2),good wear resistance3)no breakage 4)no mal-roundnessC)Applied fields: 1) metal mines 2) ...