1. A low alloy white cast iron grinding slug in the size range up to 3 inches diameter, containing alloying elements consisting essentially in weight of about: 2.5 to 4.0% Carbon . 0.3 to 0.8% silicon . 0.3 to 0.8% manganese; 0.75 to 1.5% nickel . 0 to 0.75% chromium;
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