Matrix-stiffened heat and corrosion resistant wrought products
AssigneeHuntington Alloys, Inc.
InventorsHerbert Louis Eiselstein, Edward Frederick Clatworthy, Darrell Franklin Smith, Jr.
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Abstract
Matrix-stiffened nickel-iron-chromium-columbium solid-solution alloy with excellent metallurgical stability has heat-resistant and corrosion resistant characteristics especially useful for articles needed to sustain stress in long-time service at elevated temperatures, particularly including superheater tubing in steam power plants. Alloy also has good workability and thermal response characteristics for commercial production of heat-treated wrought products.
Claims6
A wrought product consisting essentially of 17% to 22% chromium, nickel in an amount up to 44% and at least sufficient to satisfy the relationship % Ni equal at least 4/3 (% Cr) plus 8.8, 1.75% to 3.0% columbium, up to about 1% manganese, up to about 1% silicon, up to about 0.1% carbon, up to about 0.5% titanium provided the total of % Ti plus 0.216 (% Cb) does not exceed 0.85%, up to about 0.5% aluminum and balance iron with any presence of molybdenum and tungsten not exceeding 0.5% molybdenum and 0.5% tungsten and characterized by a hot-worked austenitic microstructure.
A coarse-grain annealed wrought product composed of the alloy set forth in claim and characterized by an average grain size of ASTM 4 or larger.
Dependencies are inferred from the claim text.