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High Nb, Ta, and Al creep- and oxidation-resistant austenitic stainless steel

United States Patent

July 13, 2010
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An austenitic stainless steel HTUPS alloy includes, in weight percent: 15 to 30 Ni; 10 to 15 Cr; 2 to 5 Al; 0.6 to 5 total of at least one of Nb and Ta; no more than 0.3 of combined Ti+V; up to 3 Mo; up to 3 Co; up to 1 W; up to 0.5 Cu; up to 4 Mn; up to 1 Si; 0.05 to 0.15 C; up to 0.15 B; up to 0.05 P; up to 1 total of at least one of Y, La, Ce, Hf, and Zr; less than 0.05 N; and base Fe, wherein the weight percent Fe is greater than the weight percent Ni wherein said alloy forms an external continuous scale comprising alumina, nanometer scale sized particles distributed throughout the microstructure, said particles comprising at least one composition selected from the group consisting of NbC and TaC, and a stable essentially single phase fcc austenitic matrix microstructure, said austenitic matrix being essentially delta-ferrite-free and essentially BCC-phase-free.
Brady; Michael P (Oak Ridge, TN), Santella; Michael L (Knoxville, TN), Yamamoto; Yukinori (Oak Ridge, TN), Liu; Chain-tsuan (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN), University of Tennessee Research Foundation (Knoxville, TN)
12/ 103,837
April 16, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH The United States Government has rights in this invention pursuant to contract no. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.