The invention relates to a spheroidal
graphite ausferrite
cast iron grinding ball suitable for being used in a semi-automatic
grinding machine and a preparation process. The spheroidal
graphite ausferrite
cast iron grinding ball is prepared from the following components in percentage by
mass: 3.2 to 3.9 percent of carbon, 2.30 to 2.93 percent of
silicon, 0.96 to 2.80 percent of
manganese, 0.21 to 0.90 percent of
chromium, 0.11 to 0.60 percent of
copper, 0.10 to 0.80 percent of
molybdenum, 0.10 to 0.68 percent of
vanadium, 0.10 to 0.78 percent of
titanium, 0.01 to 0.09 percent of
niobium, greater than or equal to 0 and less than 0.05 percent of
phosphorus, greater than or equal to 0 and less than 0.03 percent of
sulfur, 0.03 to 0.05 percent of
magnesium, 0.02 to 0.03 percent of
rare earth elements and the balance of iron. The preparation process comprises the following steps: firstly, performing
casting forming to prepare a cast grinding ball; secondly, performing
thermal treatment on the cast grinding ball to prepare the spheroidal
graphite ausferrite
cast iron grinding ball. The
hardness of the
heart part of the spheroidal graphite ausferrite cast iron grinding ball disclosed by the invention is 54 HRC, and the surface
hardness is 58 HRC; the
impact toughness is 17 to 20 J / cm2; furthermore, the spheroidal graphite ausferrite cast iron grinding ball is higher in
processing hardening capacity; in a wear process, a worn layer is processed to be hardened, so that the
hardness can be up to 62 to 64 HRC, and the wear amount is 70 percent of that of a general forged ball.