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Wednesday, 13 November 2013

Case Hardening Process - Nitriding

Nitriding
Points : Nitriding, Definition Definition Nitriding uses the nitrogen in ammonia gas as a hardening agent. The part to be nitrided is placed in a special furnace, heated to a temperature between 900 and 1000°F, and held there for a period of time varying form 10 to 72 h. A nitride case that averages a thickness between 0.012 and 0.018 in. usually requires between 35 and 72 h in the furnace. The furnace has a special atmosphere of ammonia gas, and the nitrogen from the ammonia combines with the steel to form an extremely hard case between 0.005 and 0.02 in. thick. Nitriding, unlike carburizing, does not require quenching to obtain hardness. Nitriding also does not require as high as temperature as carburizing. Because of these two factors, it does not distort, crack, or change any condition of the metal and because of the relatively low temperatures used, there is little or no loss in core toughness.

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