As a carburizing steel grade it is suitable for roller and ball bearings of extra light section, aero plane and motor crankshafts requiring hard surfaces for roller paths, connecting rods with case-hardened ends, as well as highly stressed gudgeon pins, gears and certain types of collets. Case hardening will give a hard wear resisting surface and tough core strength to the steel. Case hardening temperatures range from 860-960°C, followed by rapid quenching which will determine the resulting hardness.