Heat treating method of high-hardness and wear-resistant cast-iron

Abstract

The invention discloses a method for treating abrasion-resistant cast iron, which comprises the following heat treatment technological processes: firstly, annealing, namely a casting is directly heated to a temperature of between 920 and 960 DEG C, maintained for 1 to 8 hours at the temperature, slowly cooled until the temperature is between 700 and 750 DEG C, maintained for 4 to 10 hours at the temperature, slowly cooled until the temperature is less than 550 DEG C, and discharged for air cooling, so as to prevent segregation of compositions and eliminate the casting stress; secondly, quenching, namely the annealed casting is directly heated to the temperature of 1,100 DEG C, maintained for 2 to 6 hours at the temperature, and discharged for air cooling; and thirdly, tempering, namely the casting is maintained for 2 to 8 hours at a temperature of between 200 and 300 DEG C, and discharged for air cooling. The service life of the abrasion-resistant cast iron subjected to heat treatment is 1.3 to 1.6 times of that of abrasion-resistant cast iron prepared by the prior treatment method, and the hardness and the abrasion resistance of the material after heat treatment are further improved.

Description

technical field [0001] The invention relates to the technical field of thermal processing of metal materials, in particular to a heat treatment method of wear-resistant cast iron. Background technique [0002] With the rapid development of paint, pigment, cosmetics and other industries, grinding equipment is used more widely and more frequently. The quality of the grinding equipment and the grinding effect often depends on the quality of the cylinder liners and grinding discs used. The quality of the cylinder liner and the grinding disc directly depends on the quality of the material and its heat treatment process. In order to improve the material's hardness, corrosion resistance, high temperature oxidation resistance and withstand large impact loads, the inventor made appropriate improvements to the common anti-wear white cast iron material components and invented a new wear-resistant cast iron material. Composition (percentage by weight) of the following components: C: 2...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a heat treatment method for wear-resistant cast iron. The castings produced by this method have good impact toughness and the hardness and wear resistance of high-chromium cast iron; The problem of damage and fracture and the problem that although the casting has the toughness that meets the requirements of the working conditions, it is not wear-resistant; the problem of the contradiction between toughness and hardness is solved