A surface hardening process used on ferrous metals by heating the metal in contact with ammonia gas or other nitrogenous material.
A thermochemical treatment in which nitrogen is diffused into the steel. The treatment is usually carried out at a temperature around 500C, in either a gas or salt bath atmosphere, or with the use of a plasma.
The process of adding nitrogen to the surface of a steel usually from dissociated ammonia as the source. Nitriding develops a very hard case after a long time at comparatively low temperature, without quenching.
Also known as Case Nitriding, it involves infusing nitrogen into the surface layer of the part at a specific temperature, changing the alloy at that layer.
The introduction of nitrogen into the surface of tool steel by holding at a suitable temperature in contact with a nitrogenous material, usually ammonia, to produce a hard wear resistant case.
Adding nitrogen to the solid iron-base alloys by heating at a temperature below the critical in contact with ammonia or some other nitrogeneous material.
Introducing nitrogen into the surface layer of a solid ferrous alloy by holding at a suitable temperature (below Ac, 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.
A case hardening process that depends on the absorption of nitrogen into the steel. All machining, stress relieving, as well as hardening and tempering are normally carried out before nitriding. The parts are heated in a special container through which ammonia gas is allowed to pass. The ammonia splits into hydrogen and nitrogen and the nitrogen reacts with the steel penetrating the surface to form nitrides. Nitriding steels offer many advantages: a much higher surface hardness is obtainable when compared with case-hardening steels; they are extremely resistant to abrasion and have a high fatigue strength.
The diffusion of nitrogen into alloy steel to form hard nitrides in the surface layer (typically 250ยต). Performed at between 500 and 750oC from a gas, salt bath or plasma glow discharge.
The surface hardening of certain alloy steels by heating the steel in an atmosphere of nitrogen (ammonia gas) at approximately 9500F. A very hard (70+Rc) case depth of .007" to .0 15" results which is wear-resistant. Process is commonly used for barrel inside diameters, screws and valve components.
The surface hardening of certain alloy steels by heating the steel (to approximately 600 OF) in an atmosphere of hydrogen gas, adding an electrical charge to the steel and nitrogen gas, allowing a bombardment of the positively charged steel by hydrogen and nitrogen gas ions. This creates a hard (70+Rc) wear resistant, case hardness to a slightly greater and more uniform depth than gas nitriding with less distortion or contamination of the work piece. Process is commonly used on screws and valve components.
A surface hardening process involving heating in a atmosphere of ammonia or in contact with a nitrogen-bearing material so as to promote the absorption of nitrogen.