Corrosion resistant nickel-copper alloy resistant to chloride induced stress corrosion cracking. No post-weld heat treatment required. Excellent resistance to steam, torrential sea water, neutral and alkaline salt solutions. Possesses very good resistance to acid reacted salt solutions like zinc-chloride, ammonium-sulphate or ammonium-chloride as well as non oxidising acids e.g. diluted sulphuric acid, hydrochloric acid, hydrofluoric acid, silicofluoric acid, clean phosphoric acid and organic acids.