High frequency and composite structure of grinding balls for copper mineral processing

- Sep 29, 2018 -

The grinding ball of copper ore mineral processing has good toughness of high manganese steel when it is used. The whole product has good processability and low price. Its main characteristic during operation is that under the action of large impact and contact stress, The surface layer will rapidly produce work hardening, and its work hardening index is 5-7 times higher than other materials, and the wear resistance is greatly improved.

 

The grinding ball for copper mineral processing is a kind of wear-resistant material with excellent anti-wear performance. The toughness of the whole product is low, brittle fracture is easy to occur and the price is high. The high-carbon high-manganese alloy steel is mainly composed of chromium, molybdenum and the like. The alloy structural steel of the element has high hardness and good toughness, and its matrix structure has martensite, bainite or bainite + martensite composite structure. The hardness of the steel ball is about HRC60, and the impact toughness is ≥15J/CM2. Under the same working conditions, its service life is at least doubled than that of the high manganese steel ball.

 

The quenching and tempering heat treatment of the grinding ball for copper mineral processing is the key. After the straightening heat treatment, not only the overall toughness is required to reach 12 joules/cm2, but also the plasticity and wear resistance are required, but the general casting process can only reach 3- 5 joules, resulting in a high rate of breakage, even for high-chromium cast balls, so forgings are recommended when the working conditions are strong. The manufacturing process of the steel ball is also a key factor in determining its service life.

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