Alloy vermicular graphite cast iron for brake disc of rail transit vehicle

Abstract

The invention relates to an alloy vermicular graphite cast iron for brake disc of rail transit vehicle, which comprises the following components in percentage by weight: 3.4%-3.9% of carbon, 1.9%-3.0% of silicon, 0.4%-1.0% of manganese, 0.4%-1.0% of copper, 0.20%-0.60% of molybdenum, 0.10%-0.20% of titanium, 0.02%-0.028% of rare earth and the balance of inevitable impurities and ferrum. The invention also provides a brake disc made of the alloy vermicular graphite cast iron. The alloy vermicular graphite cast iron has the characteristics of high tensile strength, stable high-temperature mechanical properties, good thermal fatigue resistance, excellent heat conductivity and difficulty in generation of heat cracking. The brake disc for the rail transit vehicle, which is made of the alloy vermicular graphite cast iron, can ensure high reliability of the brake device and train operation safety, and simultaneously reduces high maintenance cost caused by faults of the brake disc.

Description

technical field [0001] The present invention relates to a vermicular graphite cast iron for brake discs, in particular to an alloy vermicular graphite cast iron used for manufacturing brake discs of rail transit vehicles, and the present invention also relates to a vermicular graphite cast iron for rail transit vehicles made of the alloy vermicular graphite cast iron brake disc. Background technique [0002] The braking system is one of the key technologies of rail transit vehicles (especially urban rail transit vehicles), which is directly related to the safety of train operation. At present, the braking system of most rail transit vehicles adopts the tread braking method. In this braking method, more than 90% of the heat is absorbed by the wheels during the braking process. Therefore, when the speed is relatively high, it is easy to cause high temperature on the wheel tread. Peeling or thermal cracks, the noise of tread braking is also relatively large, so this braking me...

AI Technical Summary

Problems solved by technology

However, the mechanical strength, high-temperature mechanical properties and therm

Images