04
2012
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01
Knowledge Related to the Breakage Rate of Steel Balls – Zhangqiu Ruinian Steel Balls
Author:
What is the breakage rate of steel balls? During production and service, steel balls can fracture due to various factors. The breakage rate is defined as the ratio of the number of fractured steel balls to the total number of steel balls. This metric serves as an indicator of the quality of the steel balls; therefore, it is important to consider this parameter when selecting steel balls.
What is the breakage rate of steel balls? During production and service, steel balls can fracture due to various factors. The breakage rate is defined as the ratio of the number of fractured steel balls to the total number of steel balls. This metric serves as an indicator of the quality of the steel balls; therefore, it is important to consider this parameter when selecting steel balls.
Under the same production and application conditions, the breakage rate of steel balls is determined by their inherent hardness. When the hardness of the steel balls is high, their toughness decreases and their brittleness increases; this effect is particularly pronounced when heat treatment is inadequate, as residual internal stresses become more significant, leading to ball fragmentation. Fragmented balls not only fail to provide effective grinding performance but also accelerate wear on other balls. Therefore, reputable casting manufacturers must conduct impact tests to determine the AK value and ensure it remains above 5%–7%, which serves as another critical quality indicator for steel balls. At the same time, metallographic microscopy should be used to verify that the number of grains per square millimeter reaches 70,000–80,000; the greater the grain count and the more uniform the grain size, the higher the material’s toughness. Only by passing these inspections can it be guaranteed that the post-use breakage rate of the steel balls will not exceed 1%.
The crushing rate is also influenced by the storage and usage conditions of the user’s steel balls:
⑴ Steel balls shall not be stored in the open air, exposed to direct sunlight or rain, and the ambient temperature shall not undergo drastic fluctuations.
(2) Before starting the mill, appropriate amounts of material should be fed into the mill; before stopping the mill, avoid over-grinding.
(3) During operation, it is important to optimize the ball charge, maintain an appropriate high-ball-to-material ratio, and properly control the filling ratio of grinding media in the mill. To this end, operations that excessively reduce feed rate in order to lower product fineness should be avoided.
(4) Do not mix steel balls of different grades or brands in the same storage bin.
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