Medium-carbon wheel steel suitable for freight trains in alpine regions and method for producing wheels by using medium-carbon wheel steel

Abstract

The invention provides medium-carbon wheel steel suitable for freight trains in alpine regions and a method for producing wheels by using the medium-carbon wheel steel. The medium-carbon wheel steel comprises the following components of 0.55% - 0.63% of C, 0.25% - 0.45% of Si, 0.65% - 0.90% of Mn, less than or equal to 0.030% of P, less than or equal to 0.025% of S, less than or equal to 0.10% ofV, less than or equal to 0.30% of Cr, less than or equal to 0.30% of Ni and 0.0050% - 0.0100% of N, and the balance Fe and inevitable impurity elements. Compared with the prior art, according to the medium-carbon wheel steel suitable for the freight trains in the alpine regions and the method for producing the wheels by using the medium-carbon wheel steel, the N is used for generating precipitatessuch as MX nitride or carbonitride, so that the supersaturation degree of ferrite is improved, V(CN) particles are promoted to nucleate quickly, the particle spacing is reduced, and the precipitationcondition effect is improved; and according to the medium-carbon wheel steel suitable for the freight trains in the alpine regions and the method for producing the wheels by using the medium-carbon wheel steel, an ideal fine pearlite and ferrite (less than 4%) structure is obtained by adopting a circulating quenching and tempering process, so that the mechanical property level of rims is higher,and the fracture resistance of the wheels under a low-temperature service condition is enhanced.

Description

technical field [0001] The invention belongs to the field of alloy manufacturing, and in particular relates to a medium-carbon wheel steel suitable for trucks in alpine regions and a method for producing wheels using the same. Background technique [0002] At present, the total length of the railway network system in the world has reached more than 1.4 million kilometers, of which the length of the railway system with a commercial nature has exceeded 1.3 million kilometers. The railway system covers as many as 109 countries around the world. The most widely used railway transportation in the world is railway freight. Railway transportation is hardly affected by the climate, and it can operate regularly, regularly and accurately throughout the year, day and night. Railway freight is most suitable for long-distance transportation of large quantities of goods, generally capable of transporting 3000-5000t of goods, which is much higher than that of automobile transportation an...

AI Technical Summary

Problems solved by technology

[0004] At present, the standard for truck wheels is mainly the domestic TB / T 2817, including CL60, CL65, and CL70, but there is no requirement for low-temperature performance. Foreign countries mainly use American standard AAR M-107 / M-208 and European standard EN13262 , the American standard AARM-107 / M-208 does not make requirements on the low temperature performance of wheels, while the European standard EN13262 clearly requires the impact performance of ER7, ER8, ER9 wheels at minus 20°C, but does not specify the low temperature toughness and wear resistance at minus 60°C make a request

In the Russian GOST 10791 standard, there are clear requirements for the impact performance of the No. 2 wheel steel at minus 60 °C, but there is also no requirement for the wear resistance of the wheel under low temperature conditions.

Images