Abstract: A new wear-resistant ductile iron with a predominantly needle structures (bainite and martensite) and a certain amount of austenite, having impact toughness of up to 10J/cm2 and the hardness of over HRC 50, can be obtained by adding Mn and trace elements instead of Ni、 Mo and Cu, and using different cooling mode from isothermal heat treatment. The results of application of new ball material under grinding production condition indicate that the wear resistance of new ball material is twice as much as that of medium manganses ductile iron ball, the impact fatigue property has increased seven times as compared with that of medium manganses ductile iron ball to which the production cost is equivalent.