Low-alloyed steel used for brake discs of rail vehicles and heat treatment method of low-alloyed steel used for brake discs of rail vehicles

Abstract

The invention relates to low-alloyed steel used for brake discs of rail vehicles and a heat treatment method of the low-alloyed steel used for the brake discs of the rail vehicles. The low-alloyed steel used for the brake discs of the rail vehicles comprises the following chemical components in percentage by weight: 0.15-0.30% of C, 0.4-1.0% of Si, 0.4-1.0% of Mn, 0.6-1.4% of Cr, 0.4-1.2% of Ni, 0.2-0.6% of Mo, 0.15-0.4% of V, 0.15-0.35% of Cu, 0.1-0.3% of W, 0.025-0.045% of Nb, 0.025-0.045% of Zr, and the balance Fe, Re and Al which remains after purification and inevitable impurities. According to the low-alloyed steel used for the brake discs of the rail vehicles and the heat treatment method of the low-alloyed steel used for the brake discs of the rail vehicles, on the basis of the characters of steel brake discs of rail vehicles in service conditions, environments and shaping processes, material component design is conducted from the aspects of improving the high-temperature strength of the material (low-alloyed steel used for the brake discs of the rail vehicles), improving the weather resistance, refining grains, improving the plasticity and the like, and proper forging ratios and a quenched-tempered heat treatment technology are selected, so that the material performance requirements of forged steel brake discs or cast steel brake discs are met separately by the mechanical performance of the material (low-alloyed steel used for the brake discs of the rail vehicles) at a room temperature. For different scales of smelting conditions, different methods for controllingthe material purity are proposed, so that the purity of the alloyed steel is improved.

Description

technical field [0001] The present invention is a divisional application of CN201711380824.6, a low-alloy steel for rail vehicle brake discs and a heat treatment method thereof, filed on December 20, 2017. [0002] The invention relates to a low-alloy steel for rail vehicle brake discs and a heat treatment method thereof, in particular to a low-alloy steel for railway rolling stock such as ordinary-speed passenger cars, EMU trains, high-speed trains, freight cars, urban rail transit vehicles, etc. A steel brake disc material belongs to the technical field of metal materials for rail transit. Background technique [0003] As the basic braking element of rail vehicles, the brake disc realizes speed regulation and parking braking of the train through strong friction with the brake pads during the braking process. During the braking process, the friction surface of the brake disc is subjected to strong friction, causing the surface temperature of the brake disc to rise sharply,...

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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.