Structure and properties of low-carbon nitrogen-containing augstenite-ferrite corrosion-resistant steels

The concentration of elements in existing austenite-ferrite steels varies in a rather narrow range. This is associated with the necessity of ensuring an optimum austenite/ferrite proportion in the structure (∼ 40–60%), which is attained by adding ferrite- and austenite-forming elements in specified amounts. The article concerns the structure, mechanical properties, and corrosion resistance of low-carbon austenite-ferrite steels with 18–25% Cr, 2–6% Mo at −7% Ni and 0.15% N and the choice of the most suitable limiting concentrations of chromium and molybdenum.