High-strength toughness low-alloy wear-resistant steel excavator bucket tooth and preparation method thereof

Abstract

The invention provides a high-strength toughness low-alloy wear-resistant steel excavator bucket tooth and a preparation method thereof. The preparation material is bainite / martensite multi-phase low-alloy wear-resistant steel, and the mass percentage of the composition is: C:0.40 ‑0.60, Si: 0.60‑1.2, Mn: 0.8‑1.2, Cr: 0.25‑0.35, Mo: 0.30‑0.50, Cu: 0.40‑0.60, Re: 0.2‑0.3, P: 0‑0.01, S: 0‑0.01 , and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: 1) melting; 2) forming by lost foam casting; 3) air cooling to room temperature when the casting is cooled to 800-900°C after pouring; 4) heating the obtained casting to 820-860°C ℃ for austenitization; 5) Quenching; 6) Take it out when the surface of the casting is cooled to 200-320℃; 7) Immediately transfer the casting to a holding furnace at 260-330℃ for isothermal transformation of bainite, and then take it out air cooled. The obtained excavator bucket tooth has high surface hardness and good wear resistance, and the internal structure can ensure good toughness, and can absorb more impact energy when impacted, thereby improving impact resistance.

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.