OXIDATION AND CORROSION BEHAVIOR OF MODIFIED-COMPOSITION, LOW-CHROMIUM 304 STAINLESS STEEL ALLOYS

摘要

The effects of substituting less strategic elements than Cr on the oxidation and corrosion resist¬ance of AISI 304 stainless steel were investigated. Cyclic oxidation resistance was evalutated at 870°C. Corrosion resistance was determined by exposure of specimens to a boiling copper-rich solution of copper sulfate and sulfuric acid. Alloy substitutes for Cr included Al, Mn, Mo, Si, Ti, V, Y, and misch metal. A level of about 12% Cr was the minimum amount of Cr re¬quired for adequate oxidation and corrosion resistance in the modified composition 304 stain-less steels. This represents a Cr saving of at least 33 percent. Two alloys containing 12% Cr and 2% Al plus 2% Mo and 12% Cr plus 2. 65% Si were identified as most promising for more detailed evaluation.