Monel belongs to the group of alloys based on nickel. The composition of Monel consists of nickel and copper with smaller amounts of carbon and silicon. These alloys are fabricated using hot-cold-working, machining and welding, as well. Monel is also known for its resistance many corrosive agents, which includes rapidly flowing sea-water.
Monel is a costly alloy and is used only for limited applications. Monel is also difficult to machine and work-hardens quickly making it difficult to use. K-500 Monel is a type of Monel alloy with aluminium and titanium additions, which give it greater strength. Whereas, Monel 400 alloy executes amazing mechanical properties at sub-zero temperatures. Monel is used in aerospace industry for aircraft construction as it can resist the heat generated due to friction during extremely high speed flights. Monel alloy also has good resistance to hydrofluoric acid. It is used in many chemical industries to contain concentrated amounts of hydrofluoric acid. The alloy is also resistant to sulphuric acid and hydrochloric acids in many forms under reducing conditions.