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

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A high toughness bainitic steel wheel for rail transit, and a manufacturing method therefor. The wheel includes the following elements by weight percentage : carbon (C) : 0.10-0.40%, silicon (Si) : 1.00-2.00%, manganese (Mn) : 1.00-2.50%, nickel (Ni) : 0.20-1.00%, rare earth (RE) : 0.001-0.040%, less than or equal to 0.020% of phosphorus (P), and less than or equal to 0.020% of sulphur (S), the remainder being iron and unavoidable residual elements, 1.50% ≤ Si+Ni ≤ 2.50%, 2.00% ≤ Si+Mn ≤ 4.00%. Via steel chemical composition design and manufacturing processes, the wheel rim has a carbide-free bainitic structure, the spokes and hub have a mainly granular bainitic and saturated ferritic microstructure, and the wheel has comprehensive mechanical properties such as high yield strength, toughness and low-temperature toughness, and good service usage properties. In addition, costs are reduced, and the service life and comprehensive benefits of the wheel are improved.