MONEL 400 (nickel-copper alloy, UNS N04400 / W. Nr. 2.4360 and 2.4361) is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments. Monel 400 is widely used in many fields, especially marine and chemical processing. Typical applications are valves and pumps, pump and propeller shafts, marine fixtures and fasteners, electrical and electronic components, springs, chemical processing equipment, gasoline and fresh water tanks, crude petroleum stills, process vessels and piping, boiler feedwater heaters and other heat exchangers, and deaerating heaters.

Limiting Chemical Composition, %

Nickel (plus Cobalt): 63.0 min.

Carbon: 0.3 max.

Manganese: 2.0 max.

Iron: 2.5 max.

Sulfur: 0.024 max.

Silicon: 0.5 max.

Copper: 28.0 - 34.0