Incoloy 825 UNS N08825 Seamless Nickel Alloy Pipe W.Nr 2.4858: Properties, Applications, and Market Insights Incoloy 825 (UNS N08825, W.Nr 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, designed for exceptional corrosion resistance in both oxidizing and reducing environments. Seamless Incoloy 825 pipes, compliant with ASTM B423, are widely used in