We are a manufacture of grinding steel ball in china. Our ball by ball milling the national standard GB8649-88, and forging (rolling) ball ferrous metallurgy industry standards (YB/T091-2005), specializes in producing hot-rolled steel ball milling. Ball diameter is Φ20-Φ130mm, there are 14 kinds of specifications .Milling ball rolling billets used in various chemical components are hot-rolled round steel bars, the diameter and the same nominal diameter steel ball.