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The process of adding nitrogen to the surface of steel parts, using dissociated ammonia as the source. Gas Nitriding develops a very hard case after long time at comparatively low temperature, without quenching. The process is carried out below the transformation temperature of alloy steels, so that there is no distortion caused by the transformation of the metal. Parts to be nitrided are pre-hardened to the proper strength level, then nitrided at a temperature where the base metal properties are not affected. As a result, a very high strength product with extremely good wear resistance can be produced, with little to no dimensional change.
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