High-carbon low-alloy wheel steel for locomotive of improving flexibility and wheel preparation method

Abstract

The invention discloses a high-carbon low-alloy wheel steel for a locomotive of improving flexibility and a wheel preparation method. The high-carbon low-alloy wheel steel comprises the following chemical components in percentage by weight: 0.56-0.66 percent of C, 0.95-1.20 percent of Si, 0.95-1.20 percent of Mn, 0.30-0.40 percent of Cr, 0.015-0.030 percent of Als, not more than 0.015 percent of P, not more than 0.015 percent of S and the balance of Fe and inevitable impurities. On the premise that the performance level of a wheel rim unchangeable is kept, the impact toughness of a wheel spoke can be effectively improved, the strength of the wheel spoke is reduced, and better matching of the comprehensive performance of the wheel spoke is obtained.

Description

technical field [0001] The invention belongs to steel for railway wheels and a heat treatment method thereof, in particular to a high-carbon low-alloy wheel steel for railway locomotives with improved toughness and a wheel preparation method with uniaxial power ≥ 1200KW, axle load ≤ 25t, and running speed ≤ 120km / h . Background technique [0002] my country's existing railway mileage accounts for 6% of the world's total railway mileage, but it has completed a quarter of the world's railway workload. The railway freight volume, passenger turnover, and transportation density all rank first in the world. With the continuous increase of my country's railway freight demand, the railway freight capacity is far from meeting the requirements, which has become one of the important bottlenecks restricting the rapid development of the national economy. [0003] The urgent task of solving freight capacity is heavy-duty transportation, which is also an inevitable trend of world railway ...

AI Technical Summary

Problems solved by technology

[0004] From the perspective of physical quality, it is easy to obtain high strength and high hardness for high-carbon and low-alloy railway locomotive wheel steels, but it is more difficult to obtain high toughness. The mounting holes meet the needs of assembly, and the high-carbon wheel steel has high strength and high crack sensitivity. Therefore, reducing the strength of the web and improving the toughness of the web are of great significance to ensure the safety of high-carbon low-alloy steel wheels.

[0005] From a production point of view, for locomotive wheels that adopt conventional heat treatment methods, the spoke plates are in a normalized state, and their strength and toughness indicators are greatly affected by changes in ambient temperature. Especially in winter, as the ambient temperature decreases (cooling rate increases) , the strength performance of the web plate is significantly increased, and the toughness index is significantly decreased, which will definitely affect the safety of use.

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