1) High Hardness: Surface hardness of forged steel ball is to 60-68 HRC and volume hardness of forged grinding ball is to 60-65 HRC;
2) High Impact Toughness: The impact toughness is more than 15 J/cm2;
3) Low Broken Rate: The actual broken rate is not higher than 1%;
4) Even Wear-resistance: The wear rate of cast ball is 50-700 g/ton.
1. Feature:
1) High Hardness grinding media for ball mill: Surface hardness of grinding media is to 60-68 HRC and volume hardness of grinding ball is to 60-65 HRC;
2) High Impact Toughness: The impact toughness is more than 15 J/cm2;
3) Low Broken Rate: The actual broken rate is not higher than 1%;
4) Even Wear-resistance: The wear rate of cast ball is 50-700 g/ton.
2. Chemical Composition of Grinding Ball
| Brand | Model | Material | C | Cr | Mn | Si | S | P |
| TITLE-1 | Forged | 45# | 0.42-0.56 | ≤0.25 | 0.50-0.80 | 0.17-0.37 | ≤0.035 | ≤0.035 |
| TITLE-2 | 50Mn | 0.48-0.56 | ≤0.25 | 0.70-1.00 | 0.17-0.37 | ≤0.035 | ≤0.035 | |
| TITLE-3 | 60Mn | 0.57-0.65 | ≤0.25 | 0.70-1.00 | 0.17-0.37 | ≤0.030 | ≤0.030 | |
| TITLE-4 | 65Mn | 0.60-0.70 | ≤0.25 | 0.70-1.00 | 0.17-0.37 | ≤0.030 | ≤0.030 | |
| TITLE-5 | B2(75MnCr) | 0.72-0.85 | 0.42-0.85 | 0.70-1.00 | 0.17-0.37 | ≤0.030 | ≤0.030 | |
| TITLE-6 | B3 | 0.52-0.65 | 0.70-1.20 | 0.40-1.20 | 1.30-1.90 | ≤0.020 | ≤0.020 | |
| TITLE-7 | Cast | Cr-23-32% | 1.80-2.80 | 23-32 | 0.4-2.5 | 0.3-1.2 | ≤0.05 | ≤0.05 |
| TITLE-8 | Cr-18-22% | 1.80-2.80 | 18-22 | 0.4-2.5 | 0.3-1.2 | ≤0.05 | ≤0.05 | |
| TITLE-9 | Cr-15-17% | 1.80-3.00 | 15-17 | 0.4-2.5 | 0.3-1.2 | ≤0.05 | ≤0.05 | |
| TITLE-10 | Cr-10-14% | 2.00-3.20 | 10-14 | 0.4-2.0 | 0.3-1.2 | ≤0.06 | ≤0.06 | |
| TITLE-11 | Cr-5-9% | 2.10-3.20 | 5-9 | 0.4-1.5 | 0.3-1.2 | ≤0.06 | ≤0.06 | |
| TITLE-12 | Cr-1-4% | 2.20-3.20 | 1-4 | 0.4-1.5 | 0.3-1.2 | ≤0.06 | ≤0.06 |
3. Product Description of Grinding Ball
| Brand | Impact Test AK.J/cm2 | Endurance Test Times(5m) | Surface Hardness | Core Hardness |
| TITLE-1 | ≥12 | ≥15000 | ≥53 | ≥35 |
| TITLE-2 | ≥12 | ≥15000 | ≥55 | ≥45 |
| TITLE-3 | ≥12 | ≥15000 | ≥55 | ≥45 |
| TITLE-4 | ≥12 | ≥15000 | ≥55 | ≥50 |
| TITLE-5 | ≥12 | ≥15000 | ≥58 | ≥55 |
| TITLE-6 | ≥12 | ≥15000 | ≥58 | ≥58 |
| TITLE-7 | ≥3 | ≥12000 | ≥58 | ≥58 |
| TITLE-8 | ≥3 | ≥12000 | ≥58 | ≥58 |
| TITLE-9 | ≥3 | ≥12000 | ≥58 | ≥58 |
| TITLE-10 | ≥3 | ≥12000 | ≥58 | ≥55 |
| TITLE-11 | ≥3 | ≥10000 | ≥53 | ≥45 |
| TITLE-12 | ≥3 | ≥10000 | ≥53 | ≥40 |
4. Specification of Grinding Ball
| Diameter | Diameter Tolerance | Average Weight per Ball | Average Numbers per Ton | |
| mm | Inch | mm | g | pc |
| 20mm | 0.75'' | +2 / -1 | 32 | 31250 |
| 25mm | 1'' | 64 | 15625 | |
| 30mm | 1.25'' | 110 | 9090 | |
| 40mm | 1.5'' | 263 | 3802 | |
| 50mm | 2'' | 513 | 1949 | |
| 60mm | 2.5'' | +3 / -2 | 888 | 1126 |
| 70mm | 2.75'' | 1410 | 709 | |
| 75mm | 3'' | 1729 | 578 | |
| 80mm | 3.25'' | 2104 | 475 | |
| 90mm | 3.5'' | 2996 | 333 | |
| 100mm | 4'' | 4110 | 243 | |
| 110mm | 4.5'' | +4 / -2 | 5457 | 182 |
| 120mm | 4.75'' | 7102 | 140 | |
| 125mm | 5'' | 8008 | 125 | |
| 130mm | 5.25'' | 9008 | 111 | |
| 140mm | 5.5'' | +4 / -3 | 11278 | 88 |
| 150mm | 6'' | 13871 | 72 |
5. SAG Mill
SAG is an acronym for Semi-Autogenous Grinding. SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill. A SAG mill is generally used as a primary or first stage grinding solution. SAG mills use a ball charge of 8 to 21%.
Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their large diameter and short length as compared to ball mills. The inside of the mill is lined with lifting plates to lift the material inside the mill, where it then falls off the plates onto the rest of the ore charge. SAG mills are primarily used at gold, copper and platinum mines with applications also in the lead, zinc, silver, alumina and nickel industries.
