The United States of America As Represented by the Secretary of

The United States of America As Represented by the Department of Energy

John S Dunning

Laurance L Oden

David E Alman

Mark I Copeland

John S Howe

A method for producing oxidation-resistant austenitic alloys for use at temperatures below 800&deg; C. comprising of: providing an alloy comprising, by weight %: 14-18% chromium, 15-18% nickel, 1-3% manganese, 1-2% molybdenum, 2-4% silicon, 0% aluminum and the balance being iron; heating the alloy to 800&deg; C. for between 175-250 hours prior to use in order to form a continuous silicon oxide film and another oxide film. The method provides a means of producing stainless steels with superior oxidation resistance at temperatures above 700&deg; C. at a low cost

Oxidation resistant alloys, method for producing oxidation resistant alloys

A two-phase ductile iron-based alloy which is resistant to oxidation and fidation at high temperatures is disclosed. The alloy contains from about 8 to 20 wt % of Cr; about 6 to 30 wt % of Ni; about 3 to 11.5 wt % of Al; and 0 to 2 wt % of Mo; about 0 to 1 wt % of Si; about 0 to 2 wt % of Mn; about to 0 to 0.1 wt % of C; about 0 to 0.02 wt % of S; about 0 to 0.02 wt % of P; about 0 to 1 wt % of Ti; about 0 to 2 wt % of Nb and Ta; and the balance of Fe. The atomic ratio of nickel to aluminum is between 0.8 and 1.2.

Ductile duplex iron-based alloy containing aluminum

A strengthened creep resistant ferritic iron alloy is provided by alloying the iron with two or more alloying metals of the type that form an intermediate Laves phase in the alloy having the composition Fe.sub.2 X, where X is the alloying metal. One of the alloying metals comprises one to five weight percent of tantalum and/or columbium while the other metal comprises one to eight weight percent of molybdenum and/or tungsten. The total of the Laves phase forming alloying metals is no more than ten weight percent in excess of that necessary to react with interstitial elements that may be added to the alloy.

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Corvallis, OR, United States of America

John S Dunning