This specification covers the engineering requirements for producing a continuous thin epsilon iron carbonitride compound layer on parts by means of a gaseous, low-temperature process, and properties of the case.

This process has been used typically to increase wear resistance and fatigue and to improve corrosion resistance on ferrous metals, such as carbon, low-alloy, and tool steels, and cast irons, but usage is not limited to such applications. This process can be selectively applied to wear areas of the component.