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It is known that nitro-oxide coatings were developed based on nitriding, which are obtained using a two-stage technology consisting of nitriding at the first stage of the process and vaporization at the second stage. Such processing provides high physical and mathematical characteristics of hardened parts. This technological process was improved by us due to preliminary oxidation, which made it possible to accelerate the production of nitride-oxide with the necessary physical and mechanical properties. This work makes a theoretical calculation of the oxidation processes and subsequent nitriding of steels and a comparison with experimental data on the example of 38X2MYA. The article presents an analysis of the formation of oxynitride diffusion protective layers obtained by a three-stage nitriding method at a temperature of 580° C, which consists of preliminary oxidation, nitriding, and subsequent steam oxidation. The article also describes the effect of the oxide film on the nitriding process during preliminary oxidation and nitriding under short-term conditions at a temperature of 580 S.

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