Special high-chromium grinding ball for mining and secondary modification processing technique thereof

The invention discloses a special high-corrosion-resistance alloy cast ball for mining wet grinding, of which the diameter is 40-140mm. The ball is prepared from the following raw materials in percentage by weight: 1.60%-2.50% of C, 0.30%-1.00% of Si, 0.20%-1.00% of Mn, 12.00%-15.00% of Cr, 0-0.05% of S, 0-0.06% of P, 0.05%-0.2% of Ni, 0.2%-0.6% of Cu, 0-0.10% of Mo, 0-0.005% of B, 0-0.020% of Ti, 0-0.060% of V and the balance of Fe. The weight ratio of Ti to B is greater than 3, and the weight ratio of V to Ti is greater than 2.8. The ball is prepared by a special secondary modification technique. The high-chromium grinding ball prepared according to the formula and processing technique has the characteristics of favorable wear resistance, high hardness, high toughness and high impact resistance.