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ARGON is an inert gas used in gas quenching, thus it has certain inherent advantages over liquid quenching media. Namely:
There are other gas quenching media, however. One (popular) gas is nitrogen. Nitrogen is more often used because it is cheaper with a faster cooling rate .
However, nitrogen can decarburize  or nitride  sensitive steels, whereas argon does not. Furthermore, when compared directly to nitrogen over a handful of samples, in most cases, argon quenched steel had slightly or significantly better mechanical properties .