Monel Alloy is a nickel-based corrosion-resistant alloy with copper as the main alloying element. Such as Monel 400 (Ni66 Cu30), Monel K500 (Ni70Cu28AlTi), etc. Monel Alloy 400 is a kind of copper-nickel alloy with excellent corrosion resistance, good corrosion resistance in various media, good welding performance, high strength, the alloy has been widely used in a variety of occasions. Excellent resistance to pitting and stress corrosion in salt water or seawater. Especially resistant to hydrofluoric acid and hydrochloric acid. Widely used in chemical, petroleum, Marine industry. Monel 400 (UNS N04400, NCu30) The structure of Monel 400 alloy is a high-strength single-phase solid solution. It is a corrosion-resistant alloy with the largest amount, the widest application and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance to hot concentrated lye. At the same time, it is also resistant to corrosion by neutral solutions, water, sea water, atmosphere, organic compounds, etc. An important feature of this alloy is that it generally does not produce stress corrosion cracks and has good cutting performance.