Low cost lean production bainitic steel wheel for rail transit, and manufacturing method therefor

摘要

A low cost lean production bainitic steel wheel for rail transit, and a manufacturing method therefor. The wheel contains the following elements by weight percentage: carbon (C): 0.15-0.45%, silicon (Si): 1.00-2.50%, manganese (Mn): 1.20-3.00%, rare earth (RE): 0.001-0.04%, less than or equal to 0.020% of phosphorus (P), and less than or equal to 0.02% of sulphur (S), the remainder being iron and unavoidable residual elements, 3.00% ≤ Si+Mn ≤ 5.00%. Via alloy design and manufacturing processes, especially a heat treatment process and technique, the wheel rim has a carbide-free bainitic structure, the spokes and hub have a granular bainitic and saturated ferritic structure with a small amount of pearlite, and the wheel has high comprehensive mechanical properties and service usage properties. In addition, alloy elements such as Mo, Ni, V, Cr and B are not specially added, significantly reducing steel costs, and implementing lean production.