Patent 7566372 was granted and assigned to Sumitomo Metal Industries on July, 2009 by the United States Patent and Trademark Office.
A railway car wheel comprises a rim having a flange and a tread portion. The tread portion contains 0.35-0.55% C and has a Vickers hardness of at least 360 and comprises a bainite structure, a tempered martensite structure, or a mixture of both.