High temperature ferritic steel

Details High temperature ferritic steel High temperature ferritic steel

1985-02-25

1987-02-03

Andrews, Melvyn J.

Metal treatment

Stock

Ferrous

148333, 148334, 420 34, 420 67, 420 68, 420 69, 420104, 420105, 420110, 420111, C22C 3826, C22C 3828

Patent

active

046407227

ABSTRACT:
A ferritic alloy steel having good formability, cyclic oxidation resistance and creep strength at elevated temperatures above 1000.degree. F. and particularly above about 1500.degree. F. (816.degree. C.) after a final anneal at 1850.degree. to 2050.degree. F. (1010.degree. to 1120.degree. C.), comprising 0.05% maximum carbon, about 2% maximum manganese, greater than 1.0% to 2.25% silicon, less than 0.5% aluminum, with silicon being at least 3 times the aluminum content, about 6% to about 25% chromium, up to about 5% molybdenum, with the sum of chromium and molybdenum being at least 8%, 0.05% maximum nitrogen, at least one of titanium, zirconium and tantalum, with said titanium, zirconium and tantalum being present in an amount at least equal to the stoichiometric equivalent of the present carbon plus the percent nitrogen, at least 0.1% uncombined columbium, and balance essentially iron.

REFERENCES:
patent: 3967935 (1976-07-01), Frehn
patent: 4261739 (1981-04-01), Douthett et al.
patent: 4286986 (1981-09-01), Borneman

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