Monel is typically much more expensive than stainless steel. Small additions of aluminium and titanium form an alloy (K-500) with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. It is commonly used in applications with highly corrosive conditions. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen. It needs to be turned and worked at slow speeds and low feed rates. As nickel and copper are mutually soluble in all proportions, it is a single-phase alloy.Ĭompared to steel, Monel is very difficult to machine as it work-hardens very quickly. For example, in 2015 Monel piping was three times more expensive than the equivalent piping made from carbon steel. The trademark was registered in May 1921, and the name is now a trademark of Special Metals Corporation.Īs an expensive alloy, its use is limited to those applications where it cannot be replaced with cheaper alternatives. One L was dropped, because family names were not allowed as trademarks at that time. Monel was named after company president Ambrose Monell, and patented in 1906. Monel alloy 400 is a binary alloy of the same proportions of nickel and copper as is found naturally in the meteoritic nickel ore from the Sudbury (Ontario) mines and is therefore considered a puritan alloy. Monel was created in 1905 by Robert Crooks Stanley, who at the time worked at the International Nickel Company (Inco). They can be fabricated readily by hot- and cold-working, machining, and welding. Stronger than pure nickel, Monel alloys are resistant to corrosion by many aggressive agents, including rapidly flowing seawater. Monel is not a cupronickel alloy because it has less than 60% copper. Monel is a group of alloys of nickel (from 52 to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. The Art Deco gate in the entrance hall of the Guardian Building is made from Monel metal.
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