Inconel 718 Fitting (UNS N07718) is a chromium-nickel-molybdenum alloy considered resistant to a wide range of severe corrosive environments, crevice corrosion and pitting corrosion. Inconel 625 Fitting (UNS N06625) is an oxidation and corrosion resistant nickel alloy with excellent water corrosion resistance and high strength. Inconel 601 Fitting (UNS N06601) is a nickel-chromium alloy used for functions requiring heat and corrosion resistance.