Introduction to relevant knowledge of Monel 400 alloy

 　　Monel 400

　　Monel 400 is a corrosion-resistant alloy with the largest usage, widest range of applications, and excellent comprehensive performance. This alloy exhibits excellent corrosion resistance in hydrofluoric acid and fluorine gas media, as well as excellent corrosion resistance to hot concentrated alkaline solution. At the same time, it is also resistant to corrosion from neutral solutions, water, seawater, 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.

　　chemical composition

　　%Nickel copper iron carbon manganese silicon sulfur

　　maximum

　　34.0 2.5 0.3 2.0 0.5 0.024

　　Min 63 28.0

　　physical property

　　Density 8.83 g/cm3

　　Melting point 1300-1390 ° C

　　Mechanical properties

　　Tensile strength (MPA)

　　Rm N/mm2 yield strength (MPA)

　　Elongation rate of RP0.2N/mm2

　　A5 %

　　480 170 35

　　Alloys have 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 based alloys. Acid medium: It is corrosion-resistant in sulfuric acid with a concentration less than 85%. Monel400 is one of the few important materials that can withstand hydrofluoric acid. Water corrosion: Monel400 alloy not only has excellent corrosion resistance in most water corrosion cases, but also rarely finds pitting corrosion, stress corrosion, etc., with a corrosion rate of less than 0.025mm/a. High temperature corrosion: The maximum temperature for continuous operation in air is generally around 600 ℃, and in high-temperature steam, the corrosion rate is less than 0.026mm/a. Ammonia: Due to the high nickel content of the alloy, it can withstand corrosion under anhydrous ammonia and ammoniation conditions below 585 ℃.



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