HIGH TOUGHNESS BAINITIC STEEL WHEEL FOR RAIL TRANSIT, AND MANUFACTURING METHOD THEREFOR

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The present invention provides a high-toughness bainitic steel wheel for rail transit and a manufacturing method therefor. The steel wheel includes elements with the following weight percents : carbon C : 0.10-0.40%, silicon Si : 1.00-2.00%, manganeseMn : 1.00-2.50%, nickel Ni : 0.20-1.00%, rare earth RE : 0.001-0.040%, phosphorus P ≤ 0.020%, and sulphur S≤0.020%, where the remaining is iron and unavoidable residual elements, and 2.00%≤Si+Mn ≤4.00%. Compared with the prior technology, in the present invention, by using design of chemical compositions of steel and production and manufacturing processes, especially a heat treatment process and technology, a rim of the wheel obtains a carbide-free bainitic structure, and a web and a wheel hub obtain a metallographic structure based on granular bainitic and supersaturated ferritic. The wheel has comprehensive mechanical properties such as high yield strength, toughness, and low-temperature toughness, and good service performance. In addition, costs are reduced, thereby improving a service life and comprehensive efficiency of the wheel, bringing specific economic and social benefits.