1) High Hardness: Surface hardness of rolling steel ball is to 60-68 HRC and volume hardness of rolling 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: Surface hardness of rolling steel ball is to 60-68 HRC and volume hardness of rolling 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 Rolling Grinding Ball
Based on steel material, the rolling steel balls are defined into 7 brands. And their chemical composition is shown in the following:
| Brand | Material | C | Mn | Si | Cr | S | P | V |
| TITLE-1 | TT-45 | 0.42-0.56 | 0.50-0.8 | 0.17-0.37 | ≤0.25 | ≤0.035 | ≤0.035 | |
| TITLE-2 | 50MN | 0.48-0.56 | 0.70-1.0 | 0.17-0.37 | ≤0.25 | ≤0.035 | ≤0.035 | |
| TITLE-3 | 60MN | 0.57-0.65 | 0.70-1.0 | 0.17-0.37 | ≤0.25 | ≤0.030 | ≤0.030 | |
| TITLE-4 | 65MN | 0.60-0.70 | 0.70-1.20 | 0.17-0.37 | ≤0.25 | ≤0.030 | ≤0.030 | |
| TITLE-5 | 75MnCr(B2) | 0.72-0.85 | 0.70-1.20 | 0.17-0.37 | 0.42-0.85 | ≤0.030 | ≤0.030 | |
| TITLE-6 | B3 | 0.5-0.65 | 0.4-1.0 | 1.3-1.9 | 0.7-1.2 | ≤0.020 | ≤0.020 | 0.1-0.2 |
3. Product Description of Rolling Grinding Ball
| Brand | Impact Test AK.J/cm2 | Endurance Test Times(5m) | Surface Hardness | Core Hardness | ||
| 20-60mm | 70-150mm | 20-60mm | 70-150mm | |||
| TITLE-1 | ≥15 | ≥15000 | ≥53 | ≥52 | ≥38 | ≥35 |
| TITLE-2 | ≥15 | ≥15000 | ≥55 | ≥55 | ≥50 | ≥40 |
| TITLE-3 | ≥15 | ≥15000 | ≥56 | ≥55 | ≥50 | ≥45 |
| TITLE-4 | ≥16 | ≥15000 | ≥58 | ≥55 | ≥55 | ≥45 |
| TITLE-5 | ≥16 | ≥15000 | ≥58 | ≥56 | ≥58 | ≥52 |
| TITLE-6 | ≥16 | ≥15000 | ≥60 | ≥58 | ≥60 | ≥55 |
4. Specification of Rolling Grinding Ball
| Nominal Diameter | Diameter Tolerance | Weight of Single Ball In Average | Numbers of Per Ton Ball In Average | |
| (mm) | (Inch) | (mm) | (g) | |
| 20 | 0.75'' | +2 -1 | 32 | 31250 |
| 25 | 1'' | 64 | 15625 | |
| 30 | 1.25'' | 110 | 9090 | |
| 40 | 1.5'' | 263 | 3802 | |
| 50 | 2'' | 513 | 1949 | |
| 60 | 2.5'' | +3 -2 | 888 | 1126 |
| 70 | 2.75 | 1410 | 709 | |
| 80 | 3.25'' | 2104 | 475 | |
| 90 | 3.5'' | 2996 | 333 | |
| 100 | 4'' | 4110 | 243 | |
| 110 | 4.5'' | +4 -2 | 5457 | 182 |
| 120 | 4.75'' | 7102 | 140 | |
| 130 | 5'' | 9030 | 110 | |
| 140 | 5.5'' | +4 -3 | 11278 | 88 |
| 150 | 6'' | 13871 | 72 | |
5. Applied Field
1) Cement Plant
2) Mines (Gold, Copper, Iron, Molybdenum, Lead, Zinc, etc)
3) Coal Power station
4) Chemical Industries
5) Sag Mill, Ball mill
6. Packaging & Shipping
(1) Container Bags: 1000KGS/Bag
(2) Container Bags: 1000KG/Bag
