Axle steel of cold zone high-speed train and preparation method of axle steel

Abstract

The invention discloses a heat treatment and a preparation method of steel for axle steel of a cold zone high-speed train. The steel grade is EA4T, and the axle steel comprises the following components of, in percentage by weight, 0.23%-0.28% of carbon, 0.17%-0.37% of silicon, 0.60%-0.77% of manganese, 0.95%-1.20% of chromium, 0.20%-0.30% of molybdenum, 0.02%-0.04% of vanadium, less than or equal to 0.20% of copper, 0.10%-0.25% of nickel, 0.010%-0.040% of aluminum, less than or equal to 0.015% of phosphorus, less than or equal to 0.010% of sulfur and 0.01%-0.05% of RE. According to the method, the phase-change transformation temperature AC1, AC3 and Ms point of the steel are calculated according to the chemical components of the steel, the heat treatment process of nine group axle steel is designed according to the phase-change transformation temperature of the steel, and the optimal heat treatment process is finally optimized, so that the technical problem that the transverse and longitudinal impact toughness, with 5 mm notch depth and at the low temperature of zero below 40 DEG C, of the axle steel of the cold zone high-speed train is greater than or equal to 30J is solved.

Description

technical field [0001] The invention relates to the field of steel preparation, in particular to a method for preparing axle steel for high-speed trains in cold zones, heat treatment of steel grade EA4T and a method for preparing the same. Background technique [0002] The train axle is a very important key component in the operation of the train, which directly determines the running speed and transportation safety of the train. During high-speed running, the bearings of train cars are subject to huge torsion while bearing the body's own weight. In recent years, with the rapid increase in the speed of high-speed trains in my country, higher requirements have been put forward for the comprehensive performance of train axles, which poses severe challenges to the production of train axles, especially in cold regions where the temperature is ≤ -40 °C. Insufficient toughness increases the risk of train operation in cold regions. Contents of the invention [0003] The purpose ...

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Problems solved by technology

In recent years, with the rapid increase in the speed of high-speed trains in my country, higher requirements have been put forward for the comprehensive performance of train axles, which poses severe challenges to the production of train axles, especially in cold regions where the temperature is ≤ -40 °C. Insufficient toughness increases the risk of train operation in cold regions

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