Does Monel 400 rust?
Monel alloy's good corrosion resistance and high strength properties also make it a great option in marine engineering, piping, cabling, chemical processing, as well as a variety of other applications depending upon what form it is used in. Being a resistant alloy, Monel 400 stands up to high temperature steam atmospheres and rapidly flowing brackish/sea water, while also maintaining excellent resistance to stress corrosion cracking in most freshwaters. It is useful in temperatures up to 1000°F (538°C) so with its anti-corrosive properties and toughness, can be an ideal choice of alloy for very unique needs and applications.
What is Monel 400 made of?
As a Nickel-Copper alloy, Monel 400 is a binary alloy, also known as a "puritan alloy". What this means is that the proportions of nickel and copper are equal to that of the natural ore extracted from the Sudbury mines in Ontario, Canada. The alloy was created by the International Nickel Company in 1901 and it was named after their company president Ambrose Monell, but because trademarks are not allowed to carry a family name, they created their own loophole by simply removing the "L" at the end. Now, the Monel 400 trademark is owned by Special Metals Corporation and it is primarily composed of 52 – 67% nickel (Ni) and copper (Cu), with small amounts of iron, manganese, carbon, and silicon. In comparison to steels, it is extremely difficult to machine as it work hardens quickly.
Other chemical composition of Monel 400 includes:
| Element | Min | Max |
| Nickel | 63% | |
| Manganese | 2.0% | |
| Silicon | .50% | |
| Iron | 2.5% | |
| Sulfur | .024% | |
| Carbon | .30% | |
| Copper | 28% | 34% |
