Heat treatment technology and device of wear-resistant alloy cast steel

Abstract

The invention relates to a heat treatment technology and device of wear-resistant alloy cast steel. The device comprises a heat treatment system composed of an annealing furnace, a quenching furnace, a quenching groove and a tempering furnace, and a transport system used for transporting and connecting cast steel between the above devices. The technology comprises the following steps: keeping temperature in the annealing furnace with the temperature of 850-900 DEG C for 3-5 hours, then discharging, performing air cooling; keeping temperature in the quenching furnace with the temperature of 890-910 DEG C for 150 minutes, discharging, cooling cast steel to about 300 DEG C with the quenching liquid, and finally keeping temperature in the tempering furnace with the temperature of 200-230 DEG C for 3-4 hours, discharging, and performing air cooling. The treated cast steel comprises the following ingredients by weight percent: 0.27-0.32% of C, 0.70-0.90% of Mn, 0.90-1.30% of Si, 1.40-1.80% of Cr, 0.10-0.20% of Mo, 0.10-0.20% of Ni and 0.02-0.03% of Ti. The treated cast steel can be used to prepare the engineering mechanical devices which contact with frozen rocks and the freezing zone.

Description

technical field [0001] The invention relates to a heat treatment process and equipment for wear-resistant alloy cast steel, especially for wear-resistant alloy cast steel with ultra-high hardness and toughness, which can be used in field mining equipment and can be adapted to harsh environmental requirements such as high strength and low temperature. The heat treatment process and its equipment. 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 t...

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.