LINING BOARD FOR LARGE-SCALE BALL MILL AND METHOD FOR HEAT TREATMENT THEREOF

摘要

The present invention is a lining board for a large-scale ball mill and a method for heat treatment thereof； the chemical composition of the lining board in mass percent is: 0.26-0.35 C, 3.5-4.2 Cr, 2.8-3.2 Mn, 1.2-1.5 Si, 0.002-0.005 B, 0.05-0.10 Ti, 0.04-0.08 Zr, 0.15-0.25 V, 0.30-0.40 Nb, 0.05-0.10 Ba, 0.02-0.06 Ca, 0.08-0.12 Re, 0-0.03 S, 0-0.04 P, with the balance being Fe. The lining board of the present invention is smelted and cast, followed by being oil-hardened, and then treated by tempering at 200-230°C. The lining board of the present invention has high strength and hardness, excellent toughness and wear-resistance, and relatively low cost and good effect.