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Cast alumina forming austenitic stainless steels

United States Patent

8,431,072
April 30, 2013
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An austenitic stainless steel alloy consisting essentially of, in terms of weight percent ranges 0.15-0.5C; 8-37Ni; 10-25Cr; 2.5-5Al; greater than 0.6, up to 2.5 total of at least one element selected from the group consisting of Nb and Ta; up to 3Mo; up to 3Co; up to 1W; up to 3Cu; up to 15Mn; up to 2Si; up to 0.15B; up to 0.05P; up to 1 total of at least one element selected from the group consisting of Y, La, Ce, Hf, and Zr; <0.3Ti+V; <0.03N; and, balance Fe, where the weight percent Fe is greater than the weight percent Ni, and wherein the alloy forms an external continuous scale comprising alumina, and a stable essentially single phase FCC austenitic matrix microstructure, the austenitic matrix being essentially delta-ferrite free and essentially BCC-phase-free. A method of making austenitic stainless steel alloys is also disclosed.
Muralidharan; Govindarajan (Knoxville, TN), Yamamoto; Yukinori (Oak Ridge, TN), Brady; Michael P. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
13/ 114,745
20120301347
May 24, 2011
STATEMENT AS TO FEDERALLY SPONSORED RESEARCH This invention was made with government support under DE-AC05-00OR22725 awarded by the United States Department of Energy. The government has certain rights in the invention.