Development of Wear-resistant Ductile Iron Mill Ball with Bainite and Martensite
A kind of new type wear resistant ductile iron mill ball has been developed.Composition and the production processes of the mill ball have been determined, and thereafter excellent properties have been obtained. The rockwell hardness and the impact toughness of the mill ball are HRC48～55 and 9～12 J/cm 2 ( α K) respectively. The dropping times of dropping ball experiment exceed 20000 times. The application of the mill ball in electric power plant expresses that the amount of abrasion is less than 120 g per ton coal and the breaking ratio is less than 0.5%.