Carbonitriding
A case hardening process in which a suitable ferrous material is heated above the lower transformation temperature in a gaseous atmosphere of such composition (including hydrocarbons, carbon monoxide, and ammonia) as to cause simultaneous, absorption of carbon and nitrogen by the surface and, by diffusion, create a concentration gradient. The process is completed by cooling at a rate that produces the desired properties in the workplace.
cycle
operation
hours per year
available space
operating temperature range
heat source