Heat treatment technology of wear-resistant alloy cast steel

Abstract

The invention relates to a heat treatment technology of wear-resistant alloy cast steel, wherein the cast steel comprises the following chemical components and mass percentages: 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 heat treatment technology comprises the following steps: preserving temperature in an annealing furnace for 3-5 hours at 850-9000 DEG C and then air cooling after getting out of the furnace; preserving temperature in a quenching furnace for 150 minutes at 900+ / -10 DEG C and then getting out; cooling the wear-resistant alloy cast steel to about 300 DEG C with quenching liquid; and finally preserving temperature in a tempering furnace for 3-4 hours at 200-230 DEG C and getting out for air cooling. The processed wear-resistant alloy cast steel can be used for manufacturing engineering mechanical apparatus contacted with frozen rock and frozen soil layer.

Description

technical field [0001] The invention relates to a heat treatment process of wear-resistant alloy cast steel, in particular to the heat treatment process of wear-resistant alloy cast steel with ultra-high hardness and toughness, which can be used in field mining equipment, can be adapted to harsh environmental requirements such as high strength and low temperature . 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 serious. [0003] The current technical status is: one is to emphasize the high toughness of the material, and the other is ...

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.