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Advanced Fe-5Cr-X Alloy

United States Patent Application

20160281197
A1
View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A tubular article can be formed from high temperature steam oxidation resistant and high temperature creep resistant alloy steel. The steel can include a chemical composition that include Fe, C, Si, Mn, Ni, Cr, Cu, Ti, Nb, Mo, and N, and optionally other elements. The steel alloy can include 0.06 to 0.15 wt % C, 0.1 to 0.5 wt % Si, 0.2 to 0.6 wt %, 0.05 to 0.4 wt % Ni, 4.5 to 6.0 wt % Cr, 1.0 to 2.0 wt % Cu, 0.04 to 0.08 wt % Ti, 0.01 to 0.06 wt % Nb, 0.45 to 1.2 wt % Mo, and 0.008 to 0.05 wt % N, up to 0.01 wt % of optional element Al, up to 0.01 wt % of optional element Zr, up to 3.0 wt % of optional element Co, up to 0.07 wt % of optional element V, up to 3.0 wt % of optional element W, up to 0.015 wt % of optional element P, up to 0.003 wt % of optional element S, up to 0.1 wt % of optional element Ca, up to 0.1 wt % of optional element Ta, up to 0.1 wt % of optional element Mg, up to 0.1 wt % of optional element Se, up to 0.1 wt % of optional element Te, up to 0.1 wt % of optional element B, up to 0.1 wt % of optional element Bi, and Fe. The steel can include copper precipitates and fine carbides, nitrides, or both. The steel can have a final microstructure comprising tempered martensite, tempered bainite, or a combination thereof. The steel can contain less than 2 vol % residual austenite.
Ortolani, Matteo (Dalmine (BG), , IT), Anelli, Ettore (Dalmine (BG), , IT), Santella, Michael L. (Mesquite, NV), Muralidharan, Govindarajan (Knoxville, TN)
14/ 668,766
March 25, 2015
STATEMENT OF GOVERNMENT INTEREST [0001] This invention was made with government support under Agreement No. NFE-07-01188 and U.S. Department of Energy Prime Contract No. DE-ACO5-00OR22725. The government has certain rights in the invention.