Abstract
The availability of grinding balls of superior quality than those produced at a Harare company in Zimbabwe, resulted in loss
of business. In order to retain business, a new ball that has a similar chemical composition to that of imported grinding balls was
developed. Proper thermo-mechanical treatment has to be done after casting, in order for the ball to be of satisfactory quality. In this
research, heat treatment tests were done on the developed ball to determine a suitable quenching medium for the heat treatment cycle.
Using the results of the heat treatment tests obtained, a suitable heat treatment cycle which utilises optimum quenching medium and has
effective agitation for minimal defects was designed.