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The chemical composition and corrosion resistance of Monel 400

Views:71     Author:Site Editor     Publish Time: 2021-04-24      Origin:Site

The structure of Monel 400 (UNS N04400, NCu30) 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 properties. 


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 resistant to corrosion from neutral solutions, water, sea water, air, organic compounds, etc. An important feature of this alloy is that it generally does not produce stress corrosion cracks and has good cutting performance.


Monel 400 Chemical Composition


Ni: margin; Cu: 28-34; Si: <0.5; Mn: <2.0; C: <0.30; Fe: <2.0


In addition to excellent mechanical properties such as high strength, corrosion resistance, and non-magnetic properties, Monel 400 alloy also has the same corrosion resistance as Monel 400. It can be used as a pump shaft material, suitable for the harsher geology of high sulfur and high wax oil layers

Work under mining conditions. Because the alloy has no plastic-brittle transition temperature, it is very suitable for various low-temperature equipment. This alloy is mainly used for pump shafts and valve stems, conveyor scrapers, oil well drilling rings, elastic parts, valve pads, etc. Suitable for stone

Oil, chemical, shipbuilding, pharmaceutical, and electronics sectors.

The chemical composition of this alloy is roughly the same as Monel 400. The biggest difference is that it contains 2.3-3.15% of Al and 0.30-1.00% of Ti. The structural characteristics of this alloy are except for the precipitation of dispersed Ni3 (A1, Ti) precipitates. ,other

Same as Monel 400 alloy.

Ni:>63; Cu:27/33; Mn<1.5; Fe<2;Si<0.5; A1 2.3/3.15;Ti0.35/0.85


Monel 400 Corrosion Resistance


The alloy has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it is more corrosion resistant than copper-based alloys in seawater.


▲ Acid medium: M400 is corrosion resistant in sulfuric acid with a concentration of less than 85%. M400 is one of the very few important materials in durable hydrofluoric acid.


▲ Water corrosion: Under most water corrosion conditions, M400 alloy not only has excellent corrosion resistance, but also pitting corrosion and stress corrosion are rarely found, and the corrosion rate is less than 0.25mm/a.


▲ High-temperature corrosion: The maximum temperature of M400 continuously working in air is generally around 600℃. In high-temperature steam, the corrosion rate is less than 0.026mm/a.

▲ Ammonia: Due to the high nickel content of Monel 400 alloy, it can withstand corrosion under anhydrous ammonia and ammoniating conditions below 585℃.


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