1) High Hardness: surface hardness of casting balls is to 60-68 HRC and volume hardness of foundry steel balls is to 60-63 HRC;
2) High Impact Toughness: the impact toughness of high chrome grinding media is more than 3 J/cm2;
3) Low Broken Rate: the actual broken rate is not higher than 1%;
4) Wear-resistant: the grinding lost of chrome steel balls is 50-700g/ton.
1. Features of Casting Grinding Ball
1) High Hardness: surface hardness of casting balls is to 60-68 HRC and volume hardness of foundry steel balls is to 60-63 HRC;
2) High Impact Toughness: the impact toughness of high chrome grinding media is more than 3 J/cm2;
3) Low Broken Rate: the actual broken rate is not higher than 1%;
4) Wear-resistant: the grinding lost of chrome steel balls is 50-700g/ton.
2. Chemical Composition of Casting Grinding Ball
| Name | Model | Material | C/% | Si/% | Mn/% | Cr/% | S/% | P/% |
| TITLE-8 | High Chrome | Cr-23-32% | 1.8-2.8 | ≤1.2 | 0.4-2.0 | 23-32 | ≤0.01 | ≤0.01 |
| TITLE-9 | Cr-18-22% | 1.8-2.8 | ≤1.2 | 0.4-2.0 | 18-22 | ≤0.01 | ≤0.01 | |
| TITLE-10 | Cr-15-17% | 1.8-3.0 | ≤1.2 | 0.4-2.0 | 15-17 | ≤0.01 | ≤0.01 | |
| TITLE-11 | Cr-10-14% | 2.0-3.2 | ≤1.2 | 0.4-2.0 | 10-14 | ≤0.01 | ≤0.01 | |
| TITLE-12 | Medium Chrome | Cr-5-9% | 2.1-3.2 | ≤1.2 | 0.4-1.5 | 5-9 | ≤0.01 | ≤0.01 |
| TITLE-13 | Low Chrome | Cr-1-4% | 2.2-3.5 | ≤1.2 | 0.4-1.5 | 1-4 | ≤0.02 | ≤0.02 |
3. Physical Property of Casting Ball
| Model | Hardness(HRC) | Impact Test(Ak.J/cm2) | Endurance Test Times(5m) | Microstructure | |
| Quenching | Unquenching | ||||
| High Chrome | ≥60 | ≥58 | ≥3 | ≥12000 | M+C |
| Medium Chrome | - | ≥53 | ≥2 | ≥10000 | P+C |
| Low Chrome | - | ≥50 | ≥2 | ≥10000 | P+C |
4. Specification of Cast 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. Main Process of Casting Grinding Ball
(1)Raw material (2)Scientific Proportioning (3)Electric Furnace Smelting (4)Assay Before Furnace (5)Mould Forming (6)Polishing (7)Heat Treatment (8)Qualified Products (9)Packing
6. 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
7. Packaging & Shipping
(1) Container Bags: 1000KGS/Bag
(2) Steel Drums (with Pallet): 850-900KGS/Drum
