Rim Toughened AISI-1070 Steel · Rim Toughening is the most popular form of heat treating for Crane Wheels, Industrial Wheels, and Sheaves · The process involves
Typical surface hardness range is 55-60 HRC in medium carbon steels. Flame hardening is used on parts such as crane wheels, cable sheaves, and rollers.
~ Xtek wheels have Higher Surface Hardness then Mckees Rocks. Why harden the wheel? Hardening the wheel surfaces improves the wear resistance of the wheel.