Monel400 is a kind of corrosion resistant alloy with the largest amount, the widest 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. Corrosion resistance of Monel400: Monel400 alloy has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it has better corrosion resistance in seawater than copper base alloy.
Acid medium: Monel400 is corrosion resistant in sulfuric acid concentration less than 85%. Monel400 is one of the few important materials that can resist hydrofluoric acid.
Water corrosion: In most cases of water corrosion, Monel400 alloy has excellent corrosion resistance, pore corrosion and stress corrosion are rarely found, and the corrosion speed is less than 0.025mm/a.
High temperature corrosion: The highest temperature of Monel400 continuous work in the air is generally about 600℃, in high temperature steam, corrosion speed is less than 0.026mm/a ammonia: Monel400 alloy nickel content is high, so it can resist the corrosion of anhydrous ammonia and ammoniation conditions below 585℃.

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When alloying elements are added to steel, iron and carbon, the basic components of steel, interact with alloying elements. The purpose of steel alloying is to improve the microstructure and properties of steel by the interaction of alloying elements with iron and carbon and the influence on the phase diagram of iron and carbon and the heat treatment of steel.