Heat-treatment method of high-chromium wear-resistant white cast iron Cr28

Abstract

The invention discloses a heat-treatment method of high-chromium wear-resistant white cast iron Cr28. According to the invention, high-chromium wear-resistant white cast iron Cr28 is heated to 1000-1050 DEG C; the white cast iron Cr28 is heated and the temperature is maintained for 1.5-3h; the white cast iron Cr28 is air-cooled to room temperature; the white cast iron Cr28 is heated to 710-730 DEG C; the white cast iron Cr28 is tempered at the temperature for 1.5-2h; and the white cast iron Cr28 is air-cooled to room temperature, such that the high-chromium wear-resistant white cast iron Cr28 with improved machining performance is obtained. According to the invention, the improved cast iron Cr28 has relatively low hardness, such that machining is convenient. Also, processed workpiece is subjected to quenching and low-temperature tempering, such that workpiece impact toughness can be improved, and wear-resistance can be improved.

Description

technical field [0001] The invention relates to a heat treatment method of high-chromium wear-resistant white cast iron Cr28, in particular to a heat treatment method for improving the machining performance of high-chromium wear-resistant white cast iron Cr28. Background technique [0002] At present, most of the workpieces requiring high wear resistance in the domestic market are high manganese steel castings. High manganese steel is widely used because of its good deformation strengthening ability and high toughness. However, the wear resistance of high manganese wear-resistant steel is not too high due to its low hardness of the matrix and few special carbide points of high hardness and wear resistance, so that it can be used in the production environment that requires extremely high performance and extremely harsh working conditions. Short life and frequent replacement. [0003] However, the high-chromium low-carbon wear-resistant white cast iron Cr28 that appeared...

AI Technical Summary

Problems solved by technology

However, the wear resistance of high manganese wear-resistant steel is not too high due to its low hardness of the matrix and few special carbide points for high hardness and wear resistance, so that it can be used in production environments that require extremely high performance and extremely harsh working conditions. Short life, frequent replacement

[0003] However, the high-chromium low-carbon wear-resistant white cast iron Cr28 that appeared in the 1960s has high hardness and good wear resistance, but the production and use of this material are limited due to the following reasons: too low toughness, high brittleness, and easy to wear during use. Fracture; the high hardness and high wear resistance points distributed in the matrix are thick strips and uneven distribution, resulting in uneven hardness, and the wear resistance has not reached the highest; at the same time, due to the high hardness of Cr28 as cast, The hardness is not lower than HRC50 and cannot be machined

Images