Alloy 31 is a nickel, chromium, and molybdenum stainless steel with nitrogen and copper additions. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media and has a strong resistance to corrosion and erosion-corrosion in the phosphoric environment.
Typically the alloy has PREN of ≥ 48, which ensures that the resistance to pitting corrosion is high.
Applications for Alloy 31:-
Used in f.ex pulp and paper industry, flue gas desulphurization – FGD – systems, seawater heat exchangers, petroleum production and refining industry, mining industry, ore processing, etc.
Solution annealing at min 1150°C followed by water quenching.