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Wrought stainless steel compositions having engineered microstructures for improved heat resistance

United States Patent

August 21, 2007
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A wrought stainless steel alloy composition includes 12% to 25% Cr, 8% to 25% Ni, 0.05% to 1% Nb, 0.05% to 10% Mn, 0.02% to 0.15% C, 0.02% to 0.5% N, with the balance iron, the composition having the capability of developing an engineered microstructure at a temperature above C. The engineered microstructure includes an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of 10.sup.10 to 10.sup.17 precipitates per cm.sup.3.
Maziasz; Philip J. (Oak Ridge, TN), Swindeman; Robert W. (Oak Ridge, TN), Pint; Bruce A. (Knoxville, TN), Santella; Michael L. (Knoxville, TN), More; Karren L. (Knoxville, TN)
UT-Battelle LLC (Oak Ridge, TN)
10/ 397,582
March 26, 2003
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.