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Alloy structural steel material for brake discs of high-speed motor train unit vehicles

A technology of alloy structural steel and high-speed EMUs, which is applied in the field of alloy structural steel materials, can solve problems such as poor thermal conductivity and thermal cracking of heat capacity, and achieve good wear resistance and thermal crack resistance, stable friction coefficient, and high friction coefficient Effect

Inactive Publication Date: 2012-07-11
北京建筑工程学院
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Problems solved by technology

However, due to the poor thermal conductivity of the brake disc materials currently used in our country, it is easy to generate thermal cracks and be scrapped due to insufficient heat capacity under high braking power, which can no longer meet the requirements of the current high-speed EMUs.

Method used

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  • Alloy structural steel material for brake discs of high-speed motor train unit vehicles

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with embodiment:

[0017] According to the composition range of the alloy structural steel material used for the brake disc of the high-speed EMU vehicle of the present invention, we determined the content of each metal element to melt the alloy steel required for the production of the brake disc according to the preparation method of the alloy structural steel material, The mechanical strength of the obtained alloy was tested, and the composition and properties of the alloy are shown in Table 1.

[0018] Table 1 Composition and properties of the alloy

[0019]

[0020] In the above embodiment, in the laboratory assessment and actual operation assessment, the measured temperature of the brake disc reaches above 600° C., and the brake disc has no cracks and obvious wear and tear.

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Abstract

The invention discloses an alloy structural steel material for brake discs of high-speed motor train unit vehicles, which belongs to the technical field of materials for brake discs. The alloy structural steel material comprises the following chemical components in percentage by weight: 0.26 to 0.30 percent of carbon, 0.8 to 1.0 percent of silicon, 0.7 to 0.9 percent of manganese, 0.9 to 1.0 percent of chromium, 0.6 to 0.8 percent of nickel, 0.2 to 0.4 percent of molybdenum, 0.01 to 0.02 percent of tungsten, 0.09 to 1.0 percent of vanadium, 0.07 to 0.08 percent of niobium, less than 0.2 percent of phosphorus, less than 0.1 percent of sulfur, and the balance of iron. The alloy structural steel material solves the problem of thermal crack damage of the conventional brake disc friction surface due to poor heat conductivity, and meanwhile, the brake disc material has enough thermal fatigue performance, high and stable friction coefficient, good abrasion resistance and thermal cracking resistance and light weight.

Description

technical field [0001] The invention belongs to the technical field of materials for brake discs, in particular to an alloy structural steel material used for brake discs of high-speed EMUs. Background technique [0002] High-speed trains have become the development direction of my country's railway transportation industry, and disc brakes are currently the main braking method for high-speed trains. With the continuous increase in the speed of high-speed EMUs, higher requirements are put forward for the material, fatigue life, safety and reliability of brake discs. However, due to the poor thermal conductivity of the brake disc materials currently used in our country, it is easy to generate thermal cracks and be scrapped due to insufficient heat capacity under high braking power, which can no longer meet the requirements of the current high-speed EMUs. Therefore, it is imperative to develop a brake disc material suitable for high-speed EMUs with excellent performance as soo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48
Inventor 杨建伟李树林杜艳平石启龙
Owner 北京建筑工程学院
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