Alloy vermicular graphite iron material

Abstract

The invention discloses an alloy vermicular graphite iron material, which is characterized by comprising the following components in percentage by weight: 3.1 to 3.6 percent of carbon, 2.1 to 2.85 percent of silicon, 0.91 to 1.25 percent of manganese, 1.05 to 1.45 percent of nickel, 0.10 to 0.25 percent of molybdenum, 0.10 to 0.20 percent of titanium, 0.01 to 0.04 percent of magnesium, less than 0.05 percent of phosphorus, less than 0.07 percent of sulfur and the balance of iron. The alloy vermicular graphite iron provided by the invention has excellent heat-conducting property as well as excellent comprehensive performance including heat crack resistance, wear resistance, corrosion resistance, low-temperature resistance, high strength and the like. 1:1 brake power bench full-scale tests show that the coefficient of the friction between a brake disc and a matched friction pair is stable and that the surface of the brake disc is free from hot marks, heat cracks and wear; and therefore, the material can ensure that the brake disc has a long service life. The material is suitable for manufacturing railway locomotive car brake discs.

Description

technical field [0001] The invention belongs to the field of metal material metallurgy, and relates to an alloy vermicular graphite cast iron material used for brake discs of railway locomotives. Background technique [0002] Due to the advantages of good casting performance, good wear resistance and low cost of use, gray cast iron materials have been widely used in friction braking materials, especially in railway locomotive brake disc materials; but ordinary gray cast iron brake discs The physical and mechanical properties, mechanical strength, low temperature resistance and thermal fatigue resistance are unsatisfactory in the context of train heavy load and speed increase, and thermal cracks and rapid wear are prone to occur during use, resulting in certain Security risks. Therefore, from the perspective of operating cost and safety, develop new alloy vermicular graphite cast iron materials with high mechanical strength, good thermal conductivity, excellent thermal fatig...

AI Technical Summary

Problems solved by technology

Although the disclosed material has a certain thermal cracking resistance and a high pearlite content, it reduces the plasticity of the material due to the addition of more manganese elements, and the size of the pearlite structure in the material is relatively large. Strength and plasticity, etc. have adverse effects