Monel 400 is a nickel-copper super alloy that is resistant to steam at high temperatures and sea water as well as to caustic and salt solutions. A solid solution alloy (Monel 400) that can only hardened by cold working. Monel 400 exhibits characteristics like high strength , toughness , good weldability and good corrosion resistance . Chemical Composition Monel 400 Ni63.0 min Fe1.0 – 2.5 C0.3 max Mn2.0 max Si0.5 max Cu28.0 – 34.0 Al0.50 max S0.02 max