High temperature ferritic steel

Details High temperature ferritic steel High temperature ferritic steel

C - Chemistry, Metallurgy

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C22C 38/50 (2006.01) C22C 38/00 (2006.01) C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01)

Patent

CA 1245477

62804-940 HIGH TEMPERATURE FERRITIC STEEL ABSTRACT OF THE DISCLOSURE An alloy steel having good formability, cyclic oxidation resistance and creep strength at elevated temperatures above 1000°F and particularly above about 1500°F (816°C) after a final anneal at 1850° to 2050°F (1010° to 1120°C), comprising 0.05% maximum carbon, about 2% maximum manganese, 1.0% to 2.0% silicon, 6% to 25% chro- mium, up to about 5% molybdenum, with the sum of chromium and molyb- denum being at least 8.0%, 0.05% maximum nitrogen, at least one of titanium, zirconium, tantalum and columbium in an amount equal to the stoichiometric equivalent of the carbon plus nitrogen contents, and containing at least 0.1% uncombined columbium, less than 0.5% aluminum and balance essentially iron.

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