High-hardness wear-resistant wheel steel and wheel preparation method

Abstract

The invention relates to wheel steel for a wheel and a preparation method therefor. The wheel steel comprises the chemical components in percentages by weight: 0.70-0.80% of C, 0.70-1.80% of Si, 0.40-1.00% of Mn, 0.15-0.30% of Cr, 0.05-0.13% of V, less than or equal to 0.012% of P, less than or equal to 0.012% of S and the balance of Fe and inevitable impurity elements. A C-Cr-V high-hardness wear-resistant wheel is prepared through the steps of electric furnace smelting continuous casting, ingot-slicing rolling, thermal treatment and the like. Compared with an AAR-C wheel steel, the prepared wheel can obviously improve the strength and hardness of the wheel, and a good comprehensive performance is obtained. Meanwhile, the high-temperature mechanical property and the friction-resistant and abrasion-resistant properties of the wheel are improved. At the same time, the wheel prepared from the wheel steel provided by the invention can maintain the texture of the original wheel, and the difficulty of preparing the wheel is not increased.

Description

technical field [0001] The invention relates to the field of manufacturing railway wheels, in particular to a high-hardness wear-resistant wheel steel with an axle load of more than 25t and a preparation method thereof. Background technique [0002] Under the current railway resource conditions, railway freight is developing in the direction of heavy load, which is also an inevitable trend of world railway transportation. The development of truck axle load is not only closely related to the development of freight volume, but also has a certain relationship with the transportation distance of goods. The average transportation distance of goods depends on the vastness of the country to a large extent. After entering the 1990s, the standard axle load of railway wagons has reached 33t; in recent years, the Russian Railways is increasing the axle load of wagons to 27t; Canada, Brazil and Australia have average Large trucks with an axle load of 30t and a load of about 90t have be...

AI Technical Summary

Problems solved by technology

According to AAR statistics, from 1999 to 2003, abrasion and peeling were the main reasons for wheel replacement in North American railways. In fact, most of the peeling was a thermal damage defect, which was mainly due to the relative sliding of the wheel-rail contact and the huge friction caused by tread braking. Heat input leads to the formation of a thin layer of martensite on the surface of the tread, which eventually forms peeling under the action of residual stress and wheel-rail contact load. It can be seen that the prominent problems caused by heavy-duty transportation in North America are wheel thermal damage and wear

[0005] my country's existing rolled steel truck wheel material is CL60 wheel steel. In recent years, traditional wheel steel has been operating under heavy load and speed-up conditions, and has exposed a large number of problems, including serious wear and edge rolling, wheel peeling, increased block loss, wheel The life of the machine is shortened sharply, resulting in frequent abnormal shutdown and maintenance

[0006] It can be seen that under the condition of heavy freight, the use conditions of the wheels have changed significantly, and the existing traditional freight train wheels are difficult to meet the new working condition requirements under heavy load and speed-up conditions. In order to ensure the safety and reliability of heavy-load transportation, It is necessary to conduct in-depth research on wheel material, metallurgical quality control, wheel rolling process, heat treatment process, etc., to develop new truck wheels suitable for my country's heavy-duty lines

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