Look up: nitriding

1. Nitriding
   Nitriding is a heat treating process that diffuses nitrogen into the surface of a metal to create a case hardened surface. It is predominantly used on steel, but also titanium, aluminum and molybdenum. Typical applications include gears, crankshafts, camshafts, cam followers, valve parts, extruder ...
   Found on http://en.wikipedia.org/wiki/Nitriding
   
   
2. nitriding
   Introducing nitrogen into the surface layer of a solid ferrous alloy by holding at a suitable temperature (below Ac1 for ferritic steels) in contact with a nitrogenous material, usually ammonia or molten cyanide of appropriate composition. Quenching is not required to produce a hard case.
   Found on http://www.encyclo.co.uk/local/20742
   
   
3. Nitriding
   The diffusion of nitrogen into alloy steel to form hard nitrides in the surface layer (typically 250µ). Performed at between 500 and 750oC from a gas, salt bath or plasma glow discharge.
   Found on http://www.poeton.co.uk/w1/glossary.htm
   
   
4. nitriding
   nitriding steels are pearlitic-martensitic steels which are particularly suitable for nitriding because of their content of nitriding agents Category: Iron and steel industries
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. nitriding
   (from the article `nitride`) ...vanadium, silicon, titanium, and tantalum are very refractory, resistant to chemical attack, and hard—and thus are useful as abrasives and in ... Another method of surface hardening, called nitriding, utilizes nitrogen and heat. Cam shafts, fuel injection pumps, and valve stems are typically ... N...
   Found on http://www.britannica.com/eb/a-z/n/44
   
   
6. Nitriding
   A process of case-hardening steels of appropriate composition with nitrogen to give superior results to case hardening with heat alone.
   Found on http://www.metalbulletin.com/Glossary.ht