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nitriding
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nitriding

industrial process
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surface hardening
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nitriding, process for hardening the surface of steel objects by introducing nitrogen (N) into it, where it combines with iron and other alloying elements to form hard metallic nitrides. Nitriding is usually done by heating steel objects in gaseous ammonia (NH3) at temperatures between 500 and 550 °C (950 and 1,050 °F) for periods of 5 to 100 hours, depending upon the desired depth of diffusion of the nitrogen. An alternative or supplement to gas nitriding is ion nitriding, or plasma nitriding, in which the steel objects are bombarded with nitrogen ions in a vacuum under an electric charge. See surface hardening.

This article was most recently revised and updated by Amy Tikkanen.