It is shown that, to develop optimum surface carbon requirements for different materials, it is necessary to modify the composition of the carburizing atmosphere to compensate for both the non-equilibrium conditions that exist during carburizing, and the alloying elements present in the material to be carburized. In addition, techniques capable of operating in accordance with these requirements, and producing the required case depth in the minimum treatment time are defined. Finally a brief analysis of possible future developments is presented.
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