The invention provides a high-strength and high-tenacity low-
alloy wear-resistant steel
excavator bucket tooth and a preparing method thereof. The preparing material of the
excavator bucket tooth, namely
austenite /
martensite multi-phase low-
alloy wear-resistant steel, consists of the following components in a percent by
mass: 0.40-0.60 of C, 0.6-1.2 of Si, 0.8-1.2 of Mn, 0.25-0.35 of Cr, 0.30-0.50 of Mo, 0.40-0.60 of Cu, 0.2-0.3 of Re, 0-0.01 of P, 0-0.01 of S and the balance of Fe and unavoidable impurities. The preparing method comprises the following steps: 1),
smelting; 2), adopting
evaporative pattern casting molding; 3), after finishing pouring, when a
casting is cooled to 800-900DEG C, air-cooling the
casting to a
room temperature; 4), heating the obtained
casting to 820-860DEG C and carrying out austenization; 5), carrying out
quenching; 6), taking out the casting after the surface of the casting is cooled to 200-320DEG C; and 7), immediately transferring the hot casting into a 260-330DEG C heat holding furnace, carrying out
bainite isothermal transformation, and then taking out and air-cooling the casting. The surface of the obtained
excavator bucket tooth has high
hardness and great
wear resistance, and the inner structure can ensure great tenacity, so that the excavator bucket tooth, when is shocked, can absorb more shock energy, and the
shock resistance is improved.