Monel is a kind of corrosion resistant alloy with large dosage, wide use and excellent comprehensive performance. The alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance in hot concentrated alkaline solution. It is also resistant to corrosion of neutral solution, water, sea water, atmosphere and organic compounds. One of the most important characteristics of the alloy is that stress corrosion cracks do not occur in general, and the cutting performance is good. The structure of Monel alloy is single phase solid solution with high strength.