Wear-resisting and corrosion-resisting alloy casting for mechanical arm and preparation method thereof

The invention provides a wear-resisting and corrosion-resisting alloy casting for a mechanical arm and a preparation method thereof. The wear-resisting and corrosion-resisting alloy casting is prepared from the following components in percentage by mass: 0.4 percent to 0.6 percent of C, 1.2 percent to 1.4 percent of Si, 0.9 percent to 1.2 percent of Mn, 0.3 percent to 0.35 percent of W, 18 percent to 20 percent of Cr, 3.5 percent to 5 percent of Ni, 0.025 percent to 0.03 percent of B, 0.3 percent to 0.5 percent of Mg, 0 to 1.5 percent of Cu, 0 to 0.4 percent of Zn, 0.05 percent to 0.2 percent of rare earth oxide, 0.005 percent to 0.01 percent of N, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S and the balance of Fe; the wear-resisting and corrosion-resisting alloy casting is prepared through the steps of hot melting, oxygen removing and degassing, inoculating, hot rolling, quenching, annealing and the like; the prepared alloy casting has excellent wear-resisting and corrosio