Huamin Supply Forged Grinding Steel Balls 20-40mm Our factory manufacture and export Forged Steel Grinding Ball for ball mill as follows: 1.Feature: The forged steel grinding ball is excellent in surface quality, toughness, and resistance to impact and abrasion. It won't crack and lose circularity easily. 1) In general, forged grinding steel ball has high hardness: Surface hardness to 55-67 HRC, volume hardness of 56-64 HRC 2) impact toughness high: Impact toughness more than 12 J / cm2. 3) broken rate is low: Peel fragmentation resistance property of over 20000 times. The actual breakage rate not greater than 1% and close to 0. 2. Specifications: 1) Diameters: Dia. 20 -40mm 2) Hardness: HRC 60-65 3) Chemical elements(%): Nominal Diameter(mm) Dimensional Tolerance(mm) Roundness % 20 �±2 6 25 �±2 6 30 �±2 5 35 �±2 5 40 �±2 5 50 +3,-1 4 60 +3,-1 4 70 +3,-1 4 75 +3,-1 4 80 +3,-1 4 90 +4,-2 4 100 +4,-2 4 120 +4,-2 4 125 +4,-2 4 130 +4,-2 4 140 +4,-2 4 150 +4,-2 4 3. Picture show 4. Packing Instruction: Barrel with wooden pallet: Steel Drum or Steel Barrel Barrel size(cm): 89 58 (Volume: 800kgs N. G. Avaliable) Pallet size(cm): 168 59 13 Two Barrel ties on the wooden pallet, steel tape for the bundle Strong Nylon Bag: Available Bag: 50kgs; 100kgs; 1000kgs