Monel es el nombre que se le da o se le asigna a las aleaciones comerciales con razones níquel-cobre de aproximadamente 2:1 de peso. El monel es más duro que el cobre y extremadamente resistente a la corrosión y posee una elevada resistencia al impacto (tal como es medida por el ensayo de Izod). Las aleaciones del monel resisten a la corrosión en un mayor rango de ambientes. Posee mayor resistencia que el níquel al ácido sulfúrico, salmuera y agua. La conductividad térmica del monel, aunque es menor que la del níquel, es significativamente mayor que la de las aleaciones de níquel que contiene cantidades de cromo o hierro. Debido a su buena conductividad térmica y resistencia a la corrosión se utiliza frecuentemente en intercambiadores de calor. En los anteojos se utiliza para varillas, puentes y partes delanteras, y con menor frecuencia para aros, permite soldaduras muy resistentes y un acabado que no se desgasta.

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Monel is a group of nickel alloys, primarily composed of nickel (up to 67%) and copper, with small amounts of iron, manganese, carbon, and silicon. Stronger than pure nickel, Monel alloys are resistant to corrosion by many agents, including rapidly flowing seawater. They can be fabricated readily by hot- and cold-working, machining, and welding. Monel was created by Robert Crooks Stanley, who worked for the International Nickel Company (INCO) in 1901. Monel alloy 400 is a binary alloy of the same proportions of nickel and copper as is found naturally in the nickel ore from the Sudbury (Ontario) mines and is therefore considered a puritan alloy. Monel was named after company president Ambrose Monell, and patented in 1906. One L was dropped, because family names were not allowed as trademarks at that time. The name is now atrademark of Special Metals Corporation. It is a very expensive alloy, with cost ranging from 5 to 10 times the cost of copper and nickel, hence its use is limited to those applications where it cannot be replaced with cheaper alternatives.Compared to carbon steel, piping in Monel is more than 3 times as expensive.

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