Other factors effect grinding balls are as followings:
Molybdenum (Mo): Molybdenum’s role is matrix refinement. It can refine
carbide, improve the electrode potential of matrix and balls corrosion
resistance. In the metal casting conditions, adding a small amount can take
effect, it mainly used for special grinding ball.
Sulfur (S): Due to the high content of manganese in steel, large amount of
MnS generated and discharged from the slag. But because it is melted in basic
slag, the sulfur can be successfully reduced to 0.03%. Such a low sulfur content
will not significantly affected the steel strength, toughness and wear
resistance.
Phosphorus (P): Phosphorus rarely dissolved in the steel separately, it often
reduces the steel strength, toughness and wear resistance as Fe2p, Fe3P form on
grain boundaries. High content carbon increase phosphorus precipitation in form
of eutectic crystal. In order to guarantee grinding media balls performance, it
should follow the below relationship: C% = 11.27-2.761 × P%. Make sure the
phosphorus content ≤0.08% in production, and important, complex and thick
pieces≤0.07%.
Silicon(SI): Silicon is an important element for grinding ball, it is not
only effectively reduce the chilling tendency and increase the amount of
ferrite, but also refine eutectic and enhance ball roundness. However, silicon
also improve brittle transition temperature of cast iron, thus reduce the impact
toughness. Therefore, the silicon content should not be too high, especially for
situation that the cast iron manganese and phosphorus content is higher.
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