High-strength and high-tenacity low-alloy wear-resistant steel excavator bucket tooth and preparing method thereof

Abstract

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.

Description

technical field [0001] The invention relates to excavator bucket teeth, in particular to a high-strength toughness bainite / martensite composite low-alloy wear-resistant steel excavator bucket tooth and a preparation method thereof. Background technique [0002] Excavator is a multi-purpose earth-rock construction machine, which is mainly used for earth-rock excavation and loading, and can also perform land leveling, slope repairing, hoisting and other operations. To complete the same earthwork workload, using excavators consumes less energy than using loaders and bulldozers, and some earthwork constructions cannot be completed by loaders and bulldozers, so excavators are used in road construction such as roads and railways, and mining. It has been widely used in bridge construction, urban construction, airport port and water conservancy construction. With the rapid development of my country's economic construction, excavators are increasingly playing a huge role in national...

AI Technical Summary

Problems solved by technology

Although high manganese steel has good toughness, under the working condition of low impact force, it cannot produce work hardening due to insufficient impact force, so that the wear resistance cannot be fully exerted and the service life is short.