Those nickel-chromium materials with very high chromium contents, such as N06072 (filler metal 72 with 44 wt% Cr), N06035 (G-35 alloy with 33.2 wt% Cr), and N06690 (alloy 690 with 29 wt% Cr), possess outstanding resistance to oxidizing aqueous environments, such as nitric acid and nitric-hydrofluoric acid mixtures.