Alloy cast steel used for high-speed train brake disc and high-speed train brake disc manufactured through alloy cast steel

Abstract

The invention discloses alloy cast steel used for a high-speed train brake disc and the high-speed train brake disc manufactured through the alloy cast steel. The alloy cast steel in the claim 1 comprises, by weight percent, 0.18%-0.26% of carbon, 0.30%-0.50% of silicon, 0.68%-1.40% of manganese, smaller than or equal to 0.025% of phosphorus, smaller than or equal to 0.013% of sulfur, 1.10%-1.82% of chromium, 0.90%-1.50% of nickel, 0.65%-1.02% of molybdenum, 0.22%-0.34% of vanadium, smaller than or equal to 0.30% of the sum of the content of other components and the balance iron, wherein tungsten is smaller than 0.1%. The alloy cast steel has the main beneficial effects that grains are refined through reasonable matching and heat treatment of alloy elements such as manganese, nickel, chromium, molybdenum and vanadium and main components such as carbon and silicon in a cast steel material, hardenability and the thermal strength performance of the alloy cast steel material are improved, the constant-temperature strength and the high-temperature strength are greatly improved, and the good comprehensive mechanical property is achieved. The brake disc manufactured through the alloy cast steel can completely meet the technical requirement for use of high-speed trains under the working condition.

Description

technical field [0001] The application date is 2012.6.28, the application number is 201210217930.3, and the name of the invention is alloy cast steel for high-speed train brake discs and its heat treatment method, and a divisional application for high-speed train brake discs made of the alloy cast steel . [0002] The invention relates to an alloy cast steel used for a high-speed train brake disc and a high-speed train brake disc manufactured from the alloy cast steel. Background technique [0003] The brake disc is an important part of the high-speed train braking system, especially for 250Km / h and higher-speed EMUs. The quality and performance of the brake disc directly affect the performance indicators of the EMU. When a high-speed train needs to be braked, the greatest impact on the quality and performance of the brake disc is the mechanical performance indicators and crack resistance of the alloy cast steel material used for the brake disc. [0004] Japanese patent do...

AI Technical Summary

Problems solved by technology

[0004] Japanese patent document JP 2005-36312 provides a kind of brake disc steel and disc brake device which are suitable for wear resistance and toughness when running at a high speed of 200 km / h. The composition ratio of disc steel materials is very wide, therefore, the overall performance of the obtained brake disc materials, especially in terms of crack resistance, often cannot meet the braking requirements of higher speed trains

At present, the cast steel brake discs of domestic high-speed trains mainly rely on imports, and the prices are expensive

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