Project Description

Monel 400 (UNS N04400)

Monel 400 (UNS N04400) 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

TrademarksGBJISKSASTMUNSDINW.NrGOSTBSNF
Monel 400MCu-28-1.5-1.8Monel 400N04400NiCu30Fe2.4360
2.4361
НМЖМц28-2.5-1.5Ni68Cu28Fe
NA12
Nu 30

Product Forms

Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings

Chemical Composition,%

CPSMnSiNiCuFe
≤0.30≤0.03≤0.024≤2.00≤0.50≥63.0028.00~34.00≤2.50

Typical Physical & Mechanical Properties (RT, Annealed)

Density, g/cm3Melting point, ℃Tensile strength, MPaYield strength, MPaElongation,%
8.801300-135055024040

Specifications

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

Features

  • 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 the     material 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

Applications

  • 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