Low-alloy cast steel for high-speed train brake disc, heat treatment method of low-alloy cast steel and brake disc

Abstract

The invention belongs to the technical field of metal materials for rail traffic, and particularly relates to low-alloy cast steel for a high-speed train brake disc, a heat treatment method of the low-alloy cast steel and the brake disc. The low-alloy cast steel comprises components in percentage by weight as follows: 0.12%-0.20% of carbon, 0.001%-0.003% of boron, 0.01%-0.05% of aluminum, 0.02%-0.07% of titanium, 0.35%-0.55% of silicon, 1.0%-1.8% of manganese, 0.10%-0.30% of chromium, 0.20%-0.40% of molybdenum, 0.15%-0.35% of nickel, smaller than or equal to 0.01% of phosphorus, smaller than or equal to 0.01% of sulfur, smaller than or equal to 0.1% of other components and the balance iron. The low-alloy cast steel has reasonable chemical composition and proportion, excellent comprehensivemechanical properties and high cost performance, and the prepared brake disc has better performance when compared with a brake disc in the prior art and can meet the use requirement of the high-speedtrain brake disc.

Description

technical field [0001] The invention belongs to the technical field of metal materials for rail transit, and in particular relates to a low-alloy cast steel for high-speed train brake discs and a heat treatment method thereof. Background technique [0002] The brake disc is a key component of the braking system of a high-speed train, and the speed regulation and parking of the train are realized through the friction with the brake pad. During the braking process, the friction between the brake disc and the brake pad will generate huge heat, most of the heat is absorbed by the brake disc, and then the heat is dissipated into the air through the heat dissipation ribs of the brake disc. In the process of repeated heat absorption and heat dissipation, the friction surface of the brake disc is prone to thermal cracks. Therefore, the reliability of the brake disc is directly related to the running safety of the train. [0003] At present, domestic high-speed train cast steel bra...

AI Technical Summary

Problems solved by technology

However, the disclosed alloy steel needs to add too many alloy elements, niobium, tungsten, copper, titanium, zirconium and aluminum elements all need to be added, and the content of expensive nickel element is required to reach 1.95-1.99%, although the addition of the above alloy elements can Improve the mechanical properties of alloy steel, but lead to expensive brake disc products, it is difficult to compete with imported mature products, and it is also difficult to meet the requirements of high-speed trains to reduce operating costs

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