A kind of medium carbon railway wagon wheel steel and preparation method thereof

Abstract

The invention discloses wheel steel for a medium-carbon railway wagon and a preparation method of the wheel steel. The wheel steel is prepared from the following chemical components in percentage by weight: 0.62 to 0.68 percent of C, 0.70 to 1.10 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.15 percent of Cr, 0.7 to 0.15 percent of V, less than or equal to 0.012 percent of P, less than or equal to 0.012 percent of S, 0.006 to 0.009 percent of N and the balance of Fe and unavoidable impurity elements. The preparation method comprises a steelmaking procedure with an electric furnace, a refining procedure with an LF furnace, an RH vacuum treatment procedure, a round billet continuous casting procedure, a cut ingot rolling procedure, a thermal treatment procedure, a machining procedure and a finished product detection procedure. According to the method, the fracture mechanical property of the wheel steel with an axle load of 23 to 30 t and the running speed less than or equal to 160 km / h can be effectively improved.

Description

technical field [0001] The invention relates to a wheel steel for a medium-carbon railway freight car and a preparation method thereof, in particular to a wheel steel for a medium-carbon railway freight car with an axle load of 23t-30t and a running speed of ≤160km / h and a preparation method thereof. Background technique [0002] As early as the 1920s of the 20th century, Griffith proposed the famous theory of brittle fracture strength of cracked bodies. However, due to the low strength, good shape and toughness of the metal structural materials used in industry at that time, brittle fracture of components was rare. After the Second World War, high-strength materials were widely used in quite a few industrial sectors, especially in the aerospace industry, which caused a series of brittle fracture accidents. [0003] Therefore, the ability to prevent component crack initiation and resist crack instability growth is an important performance index that fracture mechanics belie...

AI Technical Summary

Problems solved by technology

However, the development of fast and heavy freight transport has put forward challenging requirements for the existing conventional CL60 wheel materials, because the increase in speed and axle load will inevitably lead to deterioration of the service conditions of the wheels, increased impact force, and wheel-rail contact stress state Not only will mechanical damage such as wear and contact fatigue become prominent problems during the use of the wheel, but also the anti-crack initiation and anti-crack propagation capabilities of the wheel material are also put forward higher and higher requirements.

[0005] In order to adapt to the development of fast and heavy-duty freight, conventional CL65 material truck wheels have been basically successfully developed in China, and their service performance is obviously better than that of the existing CL60 material truck wheels. Therefore, to prepare for future fast freight transportation, it is extremely necessary to develop wheel materials that can effectively improve the fracture mechanical properties. On the basis of stabilizing the strength and hardness of the wheels, further improve the wheel's resistance to crack initiation and crack resistance Expansion capacity to better adapt to the needs of fast and heavy freight in the future

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