Patent ID: 7566372

Claim:
A railway car wheel formed by forging and rolling and having a steel composition consisting of, in mass percent, C: 0.40-0.55%, Si: 0.20-0.40%, Mn: 0.40-0.80%, Cr: 0.50-1.50%, Mo: 0.30-0.60%, P: at most 0.03%, S: at most 0.03%, Sol. Al: 0.005-0.10%, N: at most 0.02%, and a remainder of iron and impurities, and comprising a hub, a rim, and a web, the rim having a flange and a tread portion, the tread portion having a Vickers hardness of at least 390 and comprising a bainitic structure, a tempered martensite structure, or a mixture of a bainite and tempered martensite structure.