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Oxidation resistant high creep strength austenitic stainless steel

United States Patent

June 29, 2010
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An austenitic stainless steel displaying high temperature oxidation and creep resistance has a composition that includes in weight percent 15 to 21 Ni, 10 to 15 Cr, 2 to 3.5 Al, 0.1 to 1 Nb, and 0.05 to 0.15 C, and that is free of or has very low levels of N, Ti and V. The alloy forms an external continuous alumina protective scale to provide a high oxidation resistance at temperatures of 700 to C. and forms NbC nanocarbides and a stable essentially single phase fcc austenitic matrix microstructure to give high strength and high creep resistance at these temperatures.
Brady; Michael P. (Oak Ridge, TN), Pint; Bruce A. (Knoxville, TN), Liu; Chain-Tsuan (Oak Ridge, TN), Maziasz; Philip J. (Oak Ridge, TN), Yamamoto; Yukinori (Oak Ridge, TN), Lu; Zhao P. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
11/ 619,944
January 4, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to United States Department of Energy contract no. DE-AC05-000R22725 to UT-Battelle.