Alloy steel for braking discs

Abstract

The invention relates to alloy steel for braking discs. Chemical compositions of the alloy steel comprise in percentage by weight: 0.21 to 0.26 percent of carbon, 0.8 to 1.0 percent of silicon, 0.5 to 1.0 percent of manganese, 1.2 to 1.55 percent of chromium, 1.95 to 1.99 percent of nickel, 0.34 to 0.41 percent of molybdenum, 0.1 to 0.2 percent of vanadium, 0.05 to 0.06 percent of niobium, less than 0.01 percent of tungsten, less than 0.02 percent of titanium, less than 0.02 percent of aluminum, 0.05 to 0.09 percent of copper, 0.02 to 0.03 percent of zirconium, and the balance of Fe and unavoidable impurities. The alloy steel provided by the invention is steel for casting, has higher mechanical strength and thermal fatigue resistance, also has better thermal cracking resistance, stable friction property and good thermal conductivity at the same time, and is particularly suitable for producing the braking discs used for rail transit vehicles such as city rail transit vehicles, railway locomotive vehicles, motor vehicles, high-speed trains, and the like.

Description

technical field [0001] The invention relates to an alloy steel for a brake disc and a brake disc made of the alloy steel, belonging to the field of metal material metallurgy. Background technique [0002] Brake discs of vehicles, especially those of high-speed trains, work under complex working conditions such as strong friction, high thermal load, large braking force and centrifugal force, and the reliability of the brake disc almost determines the entire basic system. The reliability level of the moving device directly affects the driving safety of the train. [0003] At present, the brake disc materials of railway locomotives in the world are basically cast iron, which has the advantages of low cost and good wear resistance, and plays an important role in railway locomotives. [0004] With the rapid development of high-speed railways, the mechanical strength and friction performance of cast iron brake discs commonly used are difficult to meet the braking energy consumed ...

AI Technical Summary

Problems solved by technology

The alloy structural steel mentioned above is a kind of forged steel material. The heat dissipation rate of the forged steel brake disc made of this material is relatively slow. When braking at high speed, the friction surface temperature is high, hot spots are easy to form, and the thermal fatigue resistance is low.