OXIDATION RESISTANCE OF HIGH ALUMINUM AUSTENITIC STAINLESS STEEL.

Abstract

A new type of austenitic stainless steel has been developed containing 5 pct Al and forming a protective Al//2O//3 film. This steel is free from oxide film spalling and exhibits a greater oxidation resistance than any other conventional austenitic stainless steel. Formation of the Al//2O//3 film requires removal of the internal oxidation zone caused by hot-working, prior to being subjected to high temperatures. The application of a special Al paint is also effective in eliminating the internal oxidation zone. Abnormal oxidation takes place in this steel but has less effect than in conventional ferritic Cr-Al steels.