SAG mill balls experience both significant abrasive and impact wear due to their large (75 – 100 mm) diameters. Ball mill grinding steel balls experience a greater number of impacts, but at lower magnitude than SAG mill balls, due to the smaller ball size, and smaller mill diameter. Grindingsteel balls requires maximum abrasive wear resistance, with suitable toughness and impact resistance. Therefore, our R & D team developed a type of grinding steel ball which release great perpormance for most ball mills, and a type of SAG balls which especially designed for the large-scale SAG mills. These two types of grinding steel balls are rewarded good reputation and use experience from our clients, they also have moderate price. Forged Steel Ball Classification and Chemical CompositionSPEC. C Mn Si S P Cr SY-05-B2 0.75-0.85 0.70-0.90 0.17-0.35 0.035max 0.035max 0.40-0.60 SY-06-B3 0.50-0.65 0.40-1.00 1.35-1.85 0.035max 0.035max 0.80-1.20 Grinding forged steel ball Mechanical Propety Name Impact Value AK.J/cm2 Dropping test(sm) Hardness Ф25-50(1"-2") Ф60-90(2.5"-3.5") Ф100-150(4"-6") Surface Core Surface Core Surface Core SY-05-B2 ≥12 ≥20,000 ≥60 ≥60 ≥60 ≥54 ≥55 ≥48 SY-06-B3 ≥12 ≥20,000 ≥60 ≥60 ≥60 ≥54 ≥58 ≥53 PRODUCT DATE NOMINAL DIAMETER(mm)(INS) DIAMETRICAL TOLERANCE(mm) APPOX AVERAGE WEIGHT PER BALL AVERAGE NUMBER OF BALLS PER MT 20 4/5 25 1 30 11/4 40 11/2 +2 -1 32 64 116 263 31250 15625 8620 3802 50 2 60 21/2 70 23/4 80 31/4 +3 -1 513 888 1490 2104 1949 1126 671 475 90 33/4 100 4 110 41/2 120 5 130 51/4 140 51/2 150 6 +4 -2 2996 4110 5070 7102 9030 11278 13872 334 243 183 141 111 89 72
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