Material of high speed train brake disc for low temperature environment

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...

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

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