High-strength and high-tenacity excavator bucket tooth and production method thereof

Abstract

The invention provides a high-strength and high-tenacity excavator bucket tooth. The preparing material of the excavator bucket tooth, namely martensite/austenite multi-phase low-alloy wear-resistant steel, comprises the following components in a percent by mass: 0.25-0.35 of C, 0.4-0.6 of Si, 0.9-1.1 of Mn, 0.85-0.95 of Cr, 0.3-0.4 of Mo, 0.05-0.10 of Cu, 0.10-0.20 of Ni, 0-0.01 of P, 0-0.01 of S and the balance of Fe and unavoidable impurities. The production method comprises the following steps: 1), smelting; 2), adopting evaporative pattern casting molding; 3), after finishing pouring, when a casting is cooled to 840-900DEG C, air-cooling the casting to a room temperature; 4), heating the obtained casting to 840-900DEG C and carrying out austenization; 5), then, placing the casting in a salt bath furnace at a temperature of 230-350DEG C and carrying out quenching; 6), then, rapidly transferring the hot casting into a salt bath furnace at a temperature of 350-450DEG C, and carrying out carbon distribution; and 7), finally quenching the casting to a room temperature by water and obtaining the excavator bucket tooth. The obtained excavator bucket tooth is a martensite/austenite multi-phase low-alloy wear-resistant steel bucket tooth. The surface of the 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 and toughness excavator bucket tooth and a production 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 economic construction. [0003] In earthwork operations...

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.