Shovel tooth and preparation method thereof

Abstract

The invention discloses a shovel tooth and a preparation method thereof. The method comprises the following steps: smelting raw materials to obtain molten iron, wherein the molten iron comprises the following components: C, Mn, Si, Cr, Al, Mo, Cu, Ni, Sb, V and iron; spheroidizing, inoculating and slagging off the molten iron, cooling the molten iron to 1350-1380 DEG C, then carrying out pouring, and performing heat treatment to obtain the shovel tooth, wherein the heat treatment comprises the following steps: carrying out heating to 950-1100 DEG C, keeping the temperature for 10-30 minutes, performing air cooling to room temperature, carrying out heating to T DEG C, keeping the temperature for t min, wherein T is equal to 870-910, and t is equal to 80-110; placing the unfinished product into a nitrate solution at 220-300 DEG C, keeping the temperature for 100-200 minutes, performing water quenching at room temperature for 30-45 minutes, cooling the unfinished product in liquid nitrogen at -200 DEG C to -190 DEG C for 100-150 minutes, and standing to room temperature. The method provided by the invention is simple in process, and the obtained shovel tooth is high in hardness, good in impact toughness, excellent in wear resistance and long in service life.

Description

technical field [0001] The invention relates to the technical field of wear-resistant materials, in particular to a shovel tooth and a preparation method thereof. Background technique [0002] Forklifts are common construction machinery vehicles, and the shovel teeth at the front end are important components and also vulnerable parts. At this stage, shovel teeth are generally cast from low-alloy steel, and low-alloy steel often has good toughness, but its strength and hardness are not enough, and it is not wear-resistant, and its service life has not been long. CADI is carbide-containing austempering nodular cast iron. It is a casting alloy with ausferrite as the main matrix obtained from nodular cast iron through austempering heat treatment. It has good casting performance, low density and low cost. At the same time, CADI castings Under the conditions of impact, the surface will be hardened layer by layer, showing excellent wear resistance. It has been used as a material f...

AI Technical Summary

Problems solved by technology

At this stage, shovel teeth are generally cast from low-alloy steel, and low-alloy steel often has good toughness, but its strength and hardness are not enough, and it is not wear-resistant, and its service life has not been long

CADI is carbide-containing austempering nodular cast iron. It is a casting alloy with ausferrite as the main matrix obtained from nodular cast iron through austempering heat treatment. It has good casting performance, low density and low cost. At the same time, CADI castings Under the conditions of impact, the surface will be hardened layer by layer, showing excellent wear resistance. It has been used as a material for shovel teeth, but the service conditions of shovel teeth are very harsh, and they are subject to strong abrasive wear during use. , but also bear a certain impact load, the force is complex and periodically changed, and the requirements for wear resistance are high. The shovel teeth made of it still have the defects of wear resistance and insufficient impact toughness, which limits its application.