Oxidation resistant alloys, method for producing oxidation resistant alloys
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsJohn S. Dunning, David E. Alman
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Abstract
A method for producing oxidation-resistant austenitic alloys for use at temperatures below 800° 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° 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° C. at a low cost
Claims9
A method for producing oxidation-resistant alloys for use at temperatures below 800° C., the method comprising:
- a) providing an alloy comprising, by weight %:
- 14-18% chromium, 15-18% nickel, 1-3% manganese, 1-2% molybdenum, and 2-4% silicon, the balance being iron;
- and
- b) heating the alloy to 800° C. for between 175-250 hours prior to use,
- c) forming a continuous silicon oxide film on a surface of said alloy that protects against oxidation
- d) forming another oxide over the silicon oxide film.
A method for producing oxidation-resistant alloy for use at temperatures below 800° C., the method comprising:
- a) providing an alloy comprising, by weight %:
- 14-18% chromium, 15-18% nickel, 1-3% manganese, 1-2% molybdenum, and 2-4% silicon, the balance being iron;
- and
- b) heating the alloy at a temperature and for a time sufficient to form a continuous silicon oxide film on a surface of said alloy that protects against oxidation,
- c) forming another oxide over the silicon oxide film.
Dependencies are inferred from the claim text.