Metal treatment – Compositions – Heat treating
148 635, 148 16, C21D 800
A ferritic stainless steel alloy is provided which is hot workable and is resistant to thermal cyclic oxidation and scaling at elevated temperatures. The iron-chromium-aluminum alloy contains cerium, lanthanum and other rare earths and is suitable for forming thereon an adherent textured aluminum oxide surface. Also provided are an oxidation resistant catalytic substrate made from the alloy and a method of making the steel article and products having a textured aluminum oxide surface. The method includes steps of heat treating the cold worked steel article to form the adherent textured oxide surface and, optionally, pretreatment heating of the cold worked article before the texture heat treatment.
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Borneman Paul R.
Washko Stephen D.
Allegheny Ludlum Corporation
Rutledge L. Dewayne
Viccaro Patrick J.
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