Look up: Carbonitriding

1. 
   Carbonitriding
   Introducing carbon and nitrogen into a solid ferrous alloy by holding above the temperature at which austenite begins to form during heating, in an atmosphere that contains suitable gases such as hydrocarbons, carbon monoxide and ammonia The carbonitrided alloy is usually quench hardened. See also: Carbon, Nitrogen.
   Found on http://www.diracdelta.co.uk/science/sour
   
   
2. 
   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 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 d...
   Found on http://www.bacgroup.com/glossary/glossar
   
   
3. 
   Carbonitriding
   Similar to Carburising (see below). Diffusion of carbon and nitrogen at about 900oC (by pack, gas, salt bath or plasma process) into low carbon steel, followed by quenching and tempering to produce martensitic case (typically 1mm thick).
   Found on http://www.poeton.co.uk/w1/glossary.htm
   
   
4. 
   Carbonitriding
   `Carbonitriding` is a modification of gas carburizing, as opposed to a form of nitriding. This modification describes the addition of ammonia molecules into the gas carburizing atmosphere, and will therefore add nitrogen to the carburized case. Atomic Nitrogen is formed at the surface which thereafter diffuses into the steel with the carbon. Carbonitriding is carried out at lower temperatures and for shorter times than carburizing, which not only...
   Found on http://en.wikipedia.org/wiki/Carbonitrid
   
   
5. 
   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 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 d..
   Found on http://www.corrosionsource.com/handbook/