Heat-treatment process for low-temperature abrasion-resistant alloy cast steel

Abstract

The invention relates to a heat-treatment process for a low-temperature abrasion-resistant alloy cast steel with ultra-high hardness and toughness and wear resistance. The cast steel comprises the following chemical components in mass percentage: 0.27 0.32 percent of C, 0.70 to 0.90 percent of Mn, 0.90 to 1.30 percent of Si, 1.40 to 1.80 percent of Cr, 0.10 to 0.20 percent of Mo, 0.10 to 0.20 percent of Ni, 0.02 to 0.03 percent of Ti and 0.10 to 0.15 percent of Cu, and the rest of the components is Fe and inevitable impurities. The heat-treatment process comprises the following steps: the abrasion -resistant alloy cast steel is put into an annealing furnace at the temperature of 850 DEG C to 900 DEG C to keep the temperature for 3 to 5 hours and then is air-cooled after being discharged from the annealing furnace; the abrasion-resistant alloy cast steel is put into a quenching furnace at the temperature of 900 DEG C minus / plus 10 DEG C to keep the temperature for 150 minutes and then taken out, and then the abrasion-resistant alloy cast steel is cooled to about 300 DEG C through quenching liquid; and finally, the abrasion-resistant alloy cast steel is put into a tempering furnace at the temperature of 200 DEG C to 230 DEG C to keep the temperature for 3 to 4 hours and then taken out for air cooling. The abrasion-resistant alloy cast steel can be used for manufacturing the engineering mechanical equipment in contact with the frozen rock and the frozen soil layer.

Description

technical field [0001] The invention relates to a heat treatment process of low-temperature wear-resistant alloy cast steel, especially for low-temperature wear-resistant alloy cast steel with ultra-high hardness and toughness, which can be used in field mining equipment, can be adapted to high-strength, low-temperature and other harsh environment requirements heat treatment process. Background technique [0002] Wear and tear is ubiquitous in many industrial sectors and has become an important cause of equipment failure or material damage, while it also consumes a lot of energy and materials. Various engineering excavator and loader bucket teeth, various wear-resistant conveying pipes, various crusher hammers and jaw plates, and various track shoes made of wear-resistant alloy cast steel, due to high-strength, severe weather and other work conditions, the wear is more severe. [0003] The current technical status is: one is to emphasize the high toughness of the material,...

AI Technical Summary

Problems solved by technology

However, it is impossible to achieve an effective unification, especially in the application of outdoor mining, excavation and other construction machinery.

The wear resistance of high manganese steel is conditional, and its yield strength is low and easy to deform; low and medium alloy wear resistant steel has better strength and toughness, and its wear resistance under low and medium impact loads is better than that of high manganese steel , but there are problems of low hardenability and hardenability, and poor wear resistance; the structure of high-chromium cast iron contains more than 20% of high-hardness eutectic carbides, which has excellent wear resistance, but there are high content of alloying elements, High production cost and high temperature heat treatment are prone to deformation and cracking; ordinary white cast iron and low alloy white cast iron have low hardness, carbides are distributed continuously, and are brittle. They are easy to peel off or even crack during use.