Gas Nitriding
A surface-hardening process where nitrogen is added to the surface of steel parts using dissociated ammonia. The parts being nitrided are heat treated to the proper strength level, and final machined. The nitriding exposes the parts to active nitrogen at a carefully controlled temperature, typically in the range of 925°F to 985°F. This produces a very hard case in a low temperature, without the need for quenching.
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