Patent ID: 6491769
Filing Date: 2002-12-10
Classification: C22C

Abstract:
A high strength, corrosion resistant alloy which forms a protective layer of &agr;-chromia scale at elevated service temperatures of about 530Â° C. to 820Â° C. to improve corrosion resistance in oxidizing and sulfidizing environments, comprising, in % by weight, about: 23.5-25.5%Cr, 15.0-22.0%Co, 0.2-2.0%Al, 0.5-2.5%Ti, 0.5-2.5%Nb, 0.08% C, 0.01-0.3%Zr, 0.001-0.01%B, up to 0.05%rare earth as misch metal, 0.005-0.025%Mg plus Ca, balance Ni plus trace additions and impurities.