Monel 400 (UNS N04400 / W.Nr. 2.4360, 2.4361)

Monel 400 (UNS N04400 / W.Nr. 2.4360, 2.4361) is a single phase, solid-solution nickel-copper alloy that offers superior resistance to many corrosive environments over temperatures ranging from sub-zero to 800°F. This alloy is only hardenable through cold working, rather than heat treatment. The Curie Temperature of this alloy lies in the ambient temperature range and is affected by variations in the alloy’s chemical composition. Caution is advised in applications where strong nonmagnetic characteristics are desired. The ratio of copper to nickel in Monel 400 is almost identical to that found in the ore the metal is derived from. This alloy was first patented over 100 years ago, and it continues to be one of the most commonly used corrosion resistant alloys commercially produced.

Equivalent Grades

Monel 400MCu-28-1.5-1.8НМЖМц28-2.5-1.5Monel 400N04400NiCu302.4360

Chemical Composition, %

Monel 400≤0.30≤0.50≤2.00≤0.030≤0.024≥63.028.0-34.0≤2.50

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B164/ASME SB164, DIN 17752-17754
Plate, Sheet and StripASTM B127/ASME SB127, DIN 17750
Pipe and TubeASTM B163/ASME SB163, ASTM B725/ASME SB725, ASTM B775/ASME SB775, ASTM B751/ASME SB751, DIN17751
Welding ProductAWS A5.14/ERNiCu-7, AWS A5.14/ENiCu-7
OthersASTM B366/ASME SB366(Fittings), DIN 17743


  • Resistant to seawater and steam at high temperatures
  • Excellent resistance to rapidly flowing brackish water or seawater
  • Excellent resistance to stress corrosion cracking in most freshwaters
  • Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated
  • Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom thematerial of choice for these acids
  • Excellent resistance to neutral and alkaline salt
  • Resistance to chloride induced stress corrosion cracking
  • Good mechanical properties from sub-zero temperatures up to 1020°F
  • High resistance to alkalis


  • Marine engineering
  • Chemical and hydrocarbon processing equipment
  • Gasoline and freshwater tanks
  • Crude petroleum stills
  • De-aerating heaters
  • Boiler feed water heaters and other heat exchangers
  • Valves, pumps, shafts, fittings, and fasteners
  • Industrial heat exchangers
  • Chlorinated solvents
  • Crude oil distillation towers