UNS N04400 / DIN 2.4360 / Monel 400 Alloy Round Bars & Rods

A few of the characteristics of Monel 400 round bars include their resistance to seawater and steam at high temperatures, their excellent resistance to rapidly flowing brackish water, and their excellent resistance to stress corrosion cracking in most freshwaters. Monel 400 alloy is also exceptionally resistant to de-aerated halogen-based acids like hydrogen chloride and hydrofluoric acid, as well as neutral and alkaline salts.

In fact, Alloy 400 is practically immune to chloride-related ion stress corrosion cracking in typical environments. Although its corrosion resistance is very good in reductive environments,  it is considered poor in oxidative conditions. The  Monel 400 round Bar is not useful in oxidative acid environments, such as nitric acid and nitrous. 

In addition, this nickel-based alloy is attacked in environments containing sulfur-bearing gases at a temperature of approximately 700°F  & above. As well, molten sulfur attacks alloy 400 at temperatures over 500°F.

Despite subzero temperatures, Monel 400 Rod has excellent mechanical properties. The material can withstand temperatures up to 1000°F. Due to its high melting point, Monel 400 melts between 2370°F and 2460°F. A variety of tempering techniques can be used to increase the tensile strength of alloy 400 since it has low strength when annealed.

Monel 400 Bar Stock has about the same corrosion resistance as plain nickel but can handle high working pressures and temperatures. Due to its superior ability to yield good results after being machined, the alloy is also considered cost-efficient. 

Monel 400 round bars are used in industrial heat exchangers, marine engineering, crude petroleum stills, crude oil distillation towers, boiler feed water heaters, other heat exchangers, de-aerating heaters, chlorine solvents, gasoline tanks, and chemical and hydrocarbon processing equipment. Monel 400 can easily be welded with a gas-tungsten, gas-metal, or shielded metal arc.

The alloy should also be processed using appropriate filler metals. Despite the fact that post-weld heat treatment is not required, the alloy must be cleaned thoroughly after welding to gain maximum corrosion resistance.  In a similar fashion to most nickel-based alloys, Monel 400 is hard to machine and tends to work hard. With the right machining and tooling techniques, the alloy can yield excellent results.

In the absence of cleaning post-welding, contamination and embrittlement are possible risks. The fabrication finished Monel 400 can have a wide range of enhanced mechanical properties by using an appropriate amount of control over hot or cold working and by selecting the appropriate thermal treatment.

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