High-toughness high-carbon wheel steel for heavy-load rail wagon and preparation method thereof

Abstract

The invention discloses high-toughness high-carbon wheel steel for a heavy-load rail wagon and a preparation method of the high-toughness high-carbon wheel steel for the heavy-load rail wagon. The high-toughness high-carbon wheel steel for the heavy-load rail wagon comprises, by weight percentage, 0.67%-0.77% of C, 0.15%-1.00% of Si, 0.60%-0.90% of Mn, smaller than or equal to 0.025% of Als, smaller than or equal to 0.025% of P, 0.006%-0.020% of S, 0.005%-0.015% of V, 0.10%-0.15% of Cr and the balance Fe and inevitable impurity elements. The high-toughness high-carbon wheel steel for the heavy-load rail wagon is formed by the electric furnace steel making working procedure, the LF refining working procedure, the RH vacuum treatment working procedure, the circular blank continuous casting working procedure, the cut ingot hot rolling working procedure, the heat treatment working procedure, the processing working procedure and the finished product detection working procedure. The high-toughness high-carbon wheel steel, obtained according to the preparation method, for the heavy-load rail wagon is of a ferrite and pearlite structure. Compared with AAR-C wheel steel, the high-toughnesshigh-carbon wheel steel for the heavy-load rail wagon has the advantages that on the premise that the levels of mechanical properties of rims are basically equivalent, the low temperature impact toughness of the rims of wheels can be remarkably improved, and therefore the breakage resistance capacity of the wheels at the low temperature is effectively enhanced.

Description

technical field [0001] The invention belongs to the field of manufacturing high-carbon steel wheels for heavy-duty railway freight cars, and in particular relates to a high-toughness high-carbon wheel steel for heavy-duty railway freight cars and a preparation method thereof. Background technique [0002] The heavy-loading of freight trains is an inevitable trend of the world's railway transportation and freight transportation, which is of great significance for improving the efficiency of train transportation and enhancing the competitiveness of railway transportation. At present, the maximum axle load of foreign railway heavy-duty freight trains has reached 35.7t, the axle load of railway heavy-duty trains in the United States, Canada, Australia and other countries has generally reached more than 32.5t, and the axle load of railway heavy-duty trains in Sweden, Brazil and other countries The weight has also been increased to 30t. Foreign practice has proved that increasing...

AI Technical Summary

Problems solved by technology

The research results show that, for trucks, due to the tread braking method, as the vehicle axle load increases and the speed increases, the braking force increases, and the wheels will bear a huge thermal load during braking. As the load increases, the sliding distance of the wheel increases, which intensifies the sliding friction trend between the wheel and rail, thus increasing the probability of thermal damage defects and even thermal cracking accidents

[0004] Foreign heavy-duty wheels mainly adopt the AAR standard, using high-carbon (0.67-0.77%) high-strength, high-hardness carbon steel wheel materials. The primary consideration is wear resistance and contact fatigue resistance, but the material resists thermal damage and internal Poor ability to grow fatigue cracks

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