Abstract: Disclosed is a novel refractory metal alloy that retains the essential characteristics of pure tantalum and, additionally, has improved engineering characteristics and may be produced at a lower cost than pure tantalum. The alloy nominally contains, by weight, about 58% tantalum, about 2.0% molybdenum, about 2.5% tungsten and about 37.5% columbium.

Abstract: Disclosed is a nickel-base alloy which provides excellent corrosion resistance to a variety of severe environments, especially hot phosphoric acid. The alloy preferably contains, in weight percent: about 30 chromium, about 4 molybdenum, about 2 tungsten, about 1 Cb/Ta, about 1.5 copper, about 14 iron and the balance nickel plus the impurities and modifying elements usually found in alloy of this class. The alloy is eminently suited for use as articles in chemical processing apparatus in the manufacture and/or containment of phosphoric acid and sulfuric acid.