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Material of high speed train brake disc for low temperature environment

A technology for high-speed trains and low-temperature environments. It is applied in the field of brake disc materials. It can solve the problems of reduced impact absorption energy of alloy steel, failure to meet the performance requirements of low-temperature environments, and affect the safety of brake discs, so as to improve the impact absorption energy. Effect

Active Publication Date: 2018-10-26
WENSHANG HAIWEI MOTORCYCLE ACCESSORIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the severe cold climate in Northeast my country and other regions, the service temperature of brake discs in winter is often as low as -30°C to -60°C. Brake discs are generally made of alloy steel. Alloy steel has the characteristics of low temperature brittleness. When the temperature is lower than a certain When the temperature value (ductile-brittle critical transition temperature Tk), the impact energy absorbed by the alloy steel is significantly reduced, and the alloy steel changes from a tough state to a brittle state, which seriously affects the safety of the brake disc.
At present, although the tensile strength and yield strength of brake discs used in normal ambient temperature are relatively large, the low-temperature impact absorption energy kv2 is required to be greater than 27J (indicator of room temperature 20°C), and the impact absorption energy will decrease accordingly in low-temperature environments, and cannot reach low temperature. Performance requirements for use in the environment

Method used

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  • Material of high speed train brake disc for low temperature environment

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific examples.

[0027] According to the composition range of the material of the high-speed train brake disc used in the low temperature environment of the present invention, we have 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 steel material, and the composition of the alloy As shown in Table 1.

[0028] C%

Si%

Mn%

P%

S%

Cr%

Mo%

Ni%

0.21

0.53

0.75

0.003

0.006

0.74

0.63

1.81

Al%

Cu%

Sb%

Fe%

0.02

0.06

0.05

margin

[0029] Brake disc blank castings will be obtained for treatment process:

[0030] 1. Preheating: put the casting vertically into the auxiliary furnace (CN778-31), raise the temperature to 400°C with full power, and keep it warm for 10 m...

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Abstract

The invention discloses a material of a high speed train brake disc for low temperature environment. The material of the high speed train brake disc is characterized by comprising the composition of,by mass, 0.15-0.27% of carbon, 0.3-0.6% of silicon, 0.6-1.0% of manganese, 0.5-0.9% of chromium, 0.3-0.7% of molybdenum, 1.5-2.0% of nickel, 0.01-0.03% of aluminum, 0.05-0.09% of copper, 0.03-0.06% ofstibium, less than 0.005% of phosphorus, less than 0.01% of sulfur and the balance iron. The material combines the influence of different elements on the toughness of alloy steel, reasonably adjuststhe proportion of the alloy elements and produces the material of the brake disc. The impact absorbing energy of a brake disc at low temperature is obviously improved casting through the combination of reasonable heat treatment and cold treatment process, and the operation requirements of the brake disc under low temperature conditions are met.

Description

technical field [0001] The invention relates to the technical field of materials for brake discs, in particular to a material for high-speed train brake discs used in low-temperature environments. Background technique [0002] The brake disc is an important part of the EMU braking system. The quality of the brake disc directly affects the safety, comfort and economy of the EMU. With the rapid development of high-speed trains across the country, environmental conditions in different regions Different, the requirements for the brake disc are also different. Due to the severe cold climate in Northeast my country and other regions, the service temperature of brake discs in winter is often as low as -30°C to -60°C. Brake discs are generally made of alloy steel. Alloy steel has the characteristics of low temperature brittleness. When the temperature is lower than a certain When the temperature value (ductile-brittle critical transition temperature Tk), the impact energy absorbed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C22C38/42C22C38/60C21D1/18C21D6/00
CPCC21D1/18C21D6/004C21D6/005C21D6/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/60
Inventor 张恒岩张金刚
Owner WENSHANG HAIWEI MOTORCYCLE ACCESSORIES CO LTD
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