Weldable oxidation resistant nickel-iron-chromium-aluminum alloy
AssigneeHaynes International, Inc.
InventorsDwaine L. Klarstrom, Steven J. Matthews, Venkat R. Ishwar
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Abstract
A weldable, high temperature oxidation resistant alloy with low solidification crack sensitivity and good resistance to strain age cracking. The alloy contains by weight percent, 25% to 32% iron, 18% to 25% chromium, 3.0% to 4.5% aluminum, 0.2% to 0.6% titanium, 0.2% to 0.4% silicon, 0.2% to 0.5% manganese and the balance nickel plus impurities. The Al+Ti content should be between 3.4 and 4.2 and the Cr/Al ratio should be from about 4.5 to 8.
Claims8
A weldable, high temperature, oxidation resistant alloy consisting essentially of, by weight percent, 25% to 32% iron, 18 to 25% chromium, 3.0 to 4.5% aluminum, 0.2 to 0.6% titanium, 0.2 to 0.4% silicon, 0.2 to 0.5% manganese, up to 2.0-% cobalt, up to 0.5% molybdenum, up to 0.5% tungsten, up to 0.01% magnesium, up to 0.25% carbon, up to 0.025% zirconium, up to 0.01% yttrium, up to 0.01% cerium, up to 0.01% lanthanum, and the balance nickel plus impurities, Al+Ti content is from 3.4% to 4.2% and chromium and aluminum are present in amounts so that a Cr/Al ratio is from 4.5 to 8.
A weldable, high temperature oxidation resistant alloy comprising in weight percent 27.5% iron, 20% chromium. 3.75% aluminum, 0.25% titanium, 0.05% carbon, 0.3% silicon, 0.25% manganese and the balance nickel plus impurities.
Dependencies are inferred from the claim text.