review the steel ball (adi) life is ordinary low chromium grinding balls with the operating conditions of 2-3 times is 1-1.5 times of high chrome casting balls and forging balls save grinding mechanical and electrical consumption of 10-15% increase the output capacity more than 5% reduce 5 db noise impact toughness ak = 12-21 j/cm2 is an ideal grinding balls for large ball mill and sag
heat treatment of high chromium grinding ball is the main method to obtain good wear resistance. the research on high chromium cast iron ball mainly focuses on chemical composition selection heat treatment process determination modifier selection good carbide type and wear mechanism.
the surface of the cast grinding steel ball is not allowed to have the casting defects such as the crack and the obvious gas porosity inclusion shrinking cavity cold shut elephant skin etc. it is not allowed to have the shrinkage cavity shrinking porosity gas porosity inclusion and other cavity defects on the section including plane pasting through the pouring gate and the ball centre.
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(5) simply speaking the cast ball is the heat-resisting ball (suitable for dry grinding such as the ball grinder in cement plant) and the forged ball is the corrosion-resisting ball (suitable for wet grinding large mines power plants etc); the cast ball is suitable for the 1. 3.8m grinder while the forged ball is suitable for 1. 11m grinder.