Medium carbon low alloy steel for light high speed train wheel

Abstract

This invention relates to a type of midst-carbon and low-alloy steel which used for wheel of light super-speed railroad train. Account for weight it includes : 0.40-0.50%C 0.20-0.70%Si 0.50-0.80%Mn 0.20-0.30%Cr 0.015-0.035%Als S<=0.02% P<=0.02%,the rest is Fe and impurity element. The invention lowers the carbon inside steel, increases the Si, and adds trace quantity Al and Cr. Compared with the background technology, this invention has better property but lower cost.

Description

technical field [0001] The invention belongs to low-alloy steel for railway train wheels, in particular to low-alloy steel for railway high-speed train wheels drawn by internal combustion locomotives or electric locomotives with operating speed ≥ 200 km, axle load of 14.5 tons, and non-tread braking. Background technique [0002] The wheel is an important moving component of the train. The wheels are always in contact with the rails during the running of the train, and play the roles of carrying, transmitting power and braking. Wheel wear, fatigue and mechanical damage directly affect the service life of the wheel and driving safety. The research results show that when the train speed exceeds 120km / h, the dynamic conditions and service conditions of the train will change significantly. As the running speed increases, the wear between the wheels and rails intensifies. During the operation of the train, especially during the braking process, a large amount of frictional heat...

AI Technical Summary

Problems solved by technology

Its performance is: the tensile strength of the rim at room temperature is 970-1077N / mm 2 , This kind of wheel has high strength, but poor toughness. The problem is that it has poor resistance to heat damage, and the probability of wheel tread peeling is high, which increases maintenance costs.

In Europe, medium-carbon non-alloyed steel is used, and its alloying elements and percentage content: C≤0.52% Si≤0.40% Mn≤0.80% S≤0.020% P≤0.020% Cr≤0.30% Cu≤0.30% Mo≤0.08% Ni≤0.30% V≤0.06% Its performance is: the tensile strength of the rim at room temperature is 820~940N / mm 2 , The strength and toughness of this kind of wheel steel are poorly matched. When the tensile strength of the rim reaches 880-940N / mm2, the impact energy at room temperature is less than 20J, the impact energy at -20°C is less than 10J, and the fracture toughness is approximately equal to The thermal damage resistance is poor, the probability of wheel tread peeling is high, and the fracture toughness is greater than When above, the tensile strength of the rim is less than 880N / mm 2 , the wheels are soft, fast wear, short service life, high operating costs

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