Low alloy steel for railway vehicle brake disc and heat treatment method of low alloy steel

Abstract

The invention relates to low alloy steel for a railway vehicle brake disc and a heat treatment method of the low alloy steel. The low alloy steel for the railway vehicle brake disc comprises chemicalcomponents including, by weight percent, 0.15%-0.30% of carbon, 0.4%-1.0% of silicon, 0.4%-1.0% of manganese, 0.6%-1.4% of chrome, 0.4%-1.2% of nickel, 0.2%-0.6% of molybdenum, 0.15%-0.4% of vanadium,0.15%-0.35% of copper, 0.1%-0.3% of tungsten, 0.025%-0.045% of niobium, 0.025%-0.045% of zirconium, and the balance ferrum and Re, Al and unavoidable impurities, wherein the Re, the Al and the unavoidable impurities are left in purification. According to the low alloy steel, based on the characteristics of the railway vehicle steel brake disc in the service working condition, the environment andthe forming process, material component design is carried out on the aspects of improving the high-temperature strength of the material, enhancing weather ability, refining grains, improving plasticity and the like, a proper forging ratio and a proper quenched-tempered heat treatment process are selected, and the mechanical performance of the material at the room temperature can meet the materialperformance requirement of a forged steel brake disc or a cast steel brake disc. For the condition of different scales of smelting, different control methods for the material purity degree are put forward to improve the purity degree of alloy steel.

Description

Technical field [0001] The invention relates to a low-alloy steel for rail vehicle brake discs and a heat treatment method thereof, in particular to a type suitable for railway rolling stock such as general-speed passenger cars, EMU trains, high-speed trains, freight cars, urban rail transit vehicles, etc. Steel brake disc materials belong to the technical field of metal materials for rail transit. Background technique [0002] As the basic braking element of rail vehicles, the brake disc realizes the speed regulation and parking brake of the train through strong friction with the brake pads during the braking process. The friction surface of the brake disc is subjected to strong friction during the braking process, which causes the surface temperature of the brake disc to rise sharply, and the subsequent train operation causes the brake disc to cool down rapidly, which causes the surface of the brake disc to undergo thermal cycle and thermal-mechanical coupling The effect of th...

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Problems solved by technology

Similarly, in this patent, the inventor did not comprehensively design the brake disc in service conditions, service environment and forming process, and did not provide a corresponding purification treatment plan for the smelting conditions.