Heat Resistance of Low-Carbon Corrosion Resistant Chromium Steels with Superequilibrium Nitrogen Content

摘要

The process of oxidation in air of steels with varying content of chromium (from 15 to 24%) and nitrogen (from 0.42 to 1.22%) has been studied for temperatures within the range 500-1000 ℃ and duration of up to 10000 min. It is shown that chromium and nitrogen lower the oxidation rate of these steels. The ferrite layer under the surface oxidation film (scale) formed in the course of the oxidation process of the high nitrogen chromium steel specimens plays the role of a protective cover. The steels with 18-21% of chromium and 1.0-1.2% of nitrogen are recommended as perspective heat resistant material for elements working at temperatures of up to 800 ℃ under conditions of relatively short-term thermal impacts.