Fortification of Ni-Cr-Fe alloys with molybdenum and copper has resulted in a series of alloys with improved resistance to corrosion by hot reducing acid such as sulfuric, phosphoric, and hydrofluoric acid and acids containing oxidizing species. By maintaining copper content to about 2% or less and chromium content from 20 to 33% and molybdenum levels from 1.5 to 7.0% and replacing some of the nickel with iron to reduce cost, a group of alloys are produced that have useful corrosion resistance in a wide variety of both oxidizing and reducing acids (except hydrochloric), organic compounds and to acid, neutral, and alkaline salt solutions.

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