In a previous paper [1] we have studied the quantitative relationships of high-temperature oxidation of the new chromium (18–21%Cr) high nitrogen (0.4–1.2%N) nickel free alloys. The present work is dedicated to the qualitative relations using chemical analysis data, metallography, electron-diffraction pattern, layer X-ray analysis, etc. It is suggested that the oxidation processes of the alloy are generally governed by diffusion of chromium and iron ions in the surface layers and the diffusion

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... f these elements is hampered by the Cr 2 O 3 , which is especially strongly expressed at temperatures T ≤ 900 o C and times ≤ 1000 min.