The process called sulfinuzing was developed many years ago to increase the resistance to scuffing and frictional wear, together with increasing fatigue resistance and fretting of many ferrous metal components. Sulfinuz is a low temperature salt bath treatment generally operated in the region of 570oC to 600oC, depending on material used. Treatment times at these temperatures vary from five minutes to three hours, components may be air cooled or quenched into hot water, depending on material and geometry of the component, and also the distortion factor.

Basically the treatment is a salt bath nitriding process, which over 50 years has proven to increase the life and performance of many components, such as extrusion dies, pistons, valves and crank shafts.