Cr12 Cast Balls Grinding Media Steel Balls Castings And Forgings
1. Introduction of steel balls of ball mill castings and forgings
Ball mill steel ball is ball mill equipment grinding material medium, through the ball mill between the steel ball and the friction between the ball and material grinding effect, important basic parts, especially precision industrial steel ball plays a huge role in the development of national economy. Widely used in cement plant, power plant and so on. High and low chromium multi-element alloy steel ball, high and low chromium multi-element alloy casting.
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. Use method of steel ball in ball mill(castings and forgings)
The newly installed ball mill has a running process, in the running process, the steel ball amount added for the first time, accounted for the ball mill maximum loading amount of 80%, the proportion of steel ball added according to the size of the ball (φ 120 mm, φ 100 mm, φ 80 mm, φ 60 mm, φ 40 mm) size added. Different types of ball mills have different amounts of ball. For example, the maximum ball loading capacity of MQG1500×3000 ball mill is 9.5-10 tons. The first time to add steel ball ball (120㎜ and 100㎜) accounted for 30%-40%, in the ball 80㎜ accounted for 40%-30%, ball (60 and 40㎜) accounted for 30%.
Why ball mill ball in the process of ball mill in quantity only to add 80%, because after installation of ball mill, ball mill need mesh size, capacity are to be gradually increased, with ball mill is normal running in two or three days in a row, pick up to check the size of the gear meshing situation, everything is all right, open the add the remaining 20% steel ball mill manhole covers the second.
Note: the addition of small steel balls is only used for the first time. Because, when the ball mill is in normal operation, the reasonable friction between the steel ball and the steel ball, the steel ball and the ore, the steel ball and the ball mill lining plate will increase the abrasion, so that the large ball mill small, medium ball mill for small ball. So normally, you don't need to add more balls. Adding small balls is in the useful mineral particle size without monomer separation, when the fineness of the mill can not meet the flotation requirements, you can add appropriate amount of small balls. The steel ball in the ball mill is constantly wearing in the process of operation. In order to maintain the reasonable ratio of ball load filling rate and ball, and maintain the stable operation of the ball mill, it is necessary to carry out reasonable ball filling and low compensation wear.
The weight of the steel ball is added according to the quality of the steel ball and the quality of the steel ball, which determines the amount of ore consumption. It is best to use the new wear-resistant steel ball, such as the steel ball forged from the train wheel hub by special treatment is especially wear-resistant.
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