New Material Wear-Resistant Forged Steel Balls Of Castings And Forgings
1. Ball mill steel balls castings and forgings usage
Ball mill is the key equipment for material crushing after being crushed.
Ball mill is one of the high fine grinding machines widely used in industrial production. There are many kinds, such as horizontal ball mill, ball mill bearing bush, energy-saving ball mill, overflow type ball mill, ceramic ball mill, lattice ball mill and so on.
Ball mill is suitable for grinding all kinds of ore and other materials, is widely used in mineral processing, building materials and chemical industries, can be divided into dry and wet grinding two ways. According to the different way of ore discharge, it can be divided into two types: lattice type and overflow type.
2. Ball mill steel balls castings and forgings product parameters
(1) wear-resistant forged steel balls
| SIZES | SURFACE | CORE |
| DIA 40-60 MM | HRC60-64 | HRC59-63 |
| DIA 70-80 MM | HRC60-64 | HRC58-62 |
| DIA 90-100 MM | HRC60-64 | HRC57-61 |
| DIA 110-140 MM | HRC55-60 | HRC52-58 |
Chemical component
| C | Si | Mn | P | S | Cr |
| 0.72-0.82 | 0.17-0.37 | 0.7-0.8 | 0.035 MAX | 0.035MAX | 0.28-0.60 |
(2) New material wear-resistant forged steel balls
SIXZES: DIA 40 – 150MM
HARDNESS: HRC55-65
Chemical component
| C | Si | Mn | P | S | Cr | V |
| 0.7-0.9 | 0.45-0.75 | 0.7-1.25 | 0.04MAX | 0.04MAX | 0.11-0.4 | 0.05-0.12 |
(3) Castings and forgings steel balls product parameters
| Composition(%) | C | Si | Mn | Cr | P | S | Hardness(HRC) | Wear Rate in Gold Mine |
| Low Cr Cast Balls | 2.0~3.0 | 0.5~1.5 | ≤0.50 | 1.5~2.5 | ≤0.07 | ≤0.07 | 46~55 | About 1000g/MT |
| Mid Cr Cast Balls | 2.0~3.5 | ≤1.0 | 0.3~1.2 | 4.0~6.0 | ≤1.0 | ≤1.0 | ≥50 | About 870g/MT |
| Cr12 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 10~12 | ≤0.06 | ≤0.06 | ≥55 | ≤870g/MT |
| Cr15 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 14~16 | ≤0.06 | ≤0.06 | ≥58 |
| Cr20 Cast Balls | 2.0~3.5 | ≤1.0 | 0.5~1.5 | 17~23 | ≤0.06 | ≤0.06 | ≥60 | ≤760g/MT |
3. Ball mill steel ball castings and forgings requirements
The output of ball mill is not only affected by the load of steel ball, but also related to the diameter of steel ball. It is required to have a certain ball diameter and maintain a certain proportion of the ball with different ball diameters. The size range of the ball diameter in the general cylinder is 25-60mm. If the cylinder body is a large diameter ball, its impact force is larger, favorable for crushing large coal, but because of the large gap between the ball and the ball, the relative surface area is small, the extrusion and grinding effect is weakened, the output of the coal mill and coal fineness are unfavorable. Too many small diameter steel balls in the cylinder body and small impact force will reduce the output of the coal mill. At the same time, due to the relatively increased surface area of the steel balls, the wear of the steel balls will increase, and the power consumption of coal grinding will increase accordingly.
For example, in the running process of the coal mill, due to wear, the weight and diameter of the steel ball are constantly decreasing, so it is necessary to regularly add new balls, in order to maintain a certain steel ball loading capacity. Generally, large diameter balls are added, and the amount of balls should be determined according to the wear rate of steel balls (wear amount of steel balls per ton of coal mill) and the amount of coal mill. After running for a certain time, the number of small diameter steel balls in the cylinder increases. Therefore, after running for about 3000 hours, it is necessary to stop the machine to clean the steel balls, so as to remove the balls with a diameter less than 15mm and the broken balls, and make up the new balls at the same time.
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