Axle shaft steel for railway vehicle and production method of axle shaft steel

Abstract

The invention discloses axle shaft steel for a railway vehicle and a production method of the axle shaft steel. The axle shaft steel comprises, by weight percentage, 0.33-0.38% of C, 0.15-0.40% of Si,0.90-1.05% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.030-0.050% of V, 0.015-0.035% of Als, 0.0040-0.0090% of N and the balance iron and inevitable impurity elements, wherein the adding amount of RE in molten steel ranges from 0.020% to 0.050%. A production process of the axle shaft steel comprises the steps of smelting, LF and RH refining, protected pouring, pressure machining, rough machining, heat treatment, finish machining and inspection and warehousing. By means of the method, the defects that the surface magnetic mark rejection rate of existing axleshafts is high, and the lateral impact energy is low can be overcome; surface magnetic mark rejects of the railway vehicle axle shafts can be obviously reduced; comprehensive mechanical performance ofthe axle shaft steels is improved, in particular, the lateral impact energy is increased, and the lateral impact energy guarantee value is greater than or equal to 40 J; and thus, use safety of the axle shafts can be improved.

Description

technical field [0001] The invention relates to a structural steel for machinery manufacturing and a production method thereof, in particular to an axle steel for railway vehicles and a production method thereof. Background technique [0002] The railway vehicle axle is an important part to ensure the safety of railway vehicles, and its quality status is closely related to the safety of railway transportation. With the rapid development of China's railway transportation, the quality requirements for railway vehicle axles are also getting higher and higher. During the operation of railway vehicles, the vehicle bearings are subjected to bending force, torsion force and impact force, and are used under alternating stress conditions for a long time, so the stress situation is very complicated. The stress on the surface of the axle is the worst when it is in use. Therefore, it is particularly important to improve its surface quality on the premise of ensuring its comprehensive p...

AI Technical Summary

Problems solved by technology

[0006] However, at present, most of the axle steels produced according to the above standards have surface magnetic defects, and the transverse impact energy is low and unstable.

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