China Hot Sale Forged Steel Grinding Media Ball Cast Iron . high quality forged steel grinding ball/grinding media for mine. description two hot sale grinding balls specially designed for ball mill and sag mill,high quality grinding steel balls of power plant / ball mill,product name, forged steel ball. steel ball diameter, 20mm - 150mm. material grade, 45, 50mn, 60mn, 65mn, b2, b3, bl, bg ...