Monel 400

Monel 400 (UNS N04400)

Monel 400, also known as alloy 400 is nickel-copper alloy that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress-corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in off shore & marine applications and other non-oxidizing chloride solutions. This nickel alloy is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. As would be expected from its high copper content, alloy 400 is rapidly attacked by nitric acid and ammonia systems. Monel 400 is approved for construction of pressure vessels and components under ASME Boiler and Pressure Vessel Code Section VIII, Division 1 (ASME VIII Div 1) for service up to 900° F and Section VIII, Division 2 (ASME VIII Div 2) for service up to 800°. Nano-Mag Technologies offer various products made from Monel 400 material including Autoclave, Reactor, Hydrogenator, Pressure vessels, Magnetic Drives, Catalyst Filters, Mini Magnetic Couplings etc. as per the requirement.
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Characteristics of Monel 400

  • 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

Chemical Composition:

Nickel:63 min.
Sulphur3.15 – 4.15
Iron:2.5 max.
Manganese:2 max.
Silicon:0.5 max.
Carbon:0.3 max.

Indicative Corrosion Data

ChemicalCorrosion Resistance
Alkaline & SaltsGood
Hydrochloric AcidFair
Hydrofluric AcidGood
Nitric AcidNot Suitable
Organic AcidGood
Phosphoric AcidGood
Sulfuric AcidGood

Corrosion rates may vary at different concentrations and temperatures . Each user is advised to carry out their own corrosion test with sample coupon

Material Specification

Plate, Sheet & StripSB-127B-12717750
Rod & BarSB-164B-16417752
Seamless Pipe & TubeSB-163B-16317551
Welded PipeSB-725B-725-
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Monel 400 High Pressure Autoclave50 ml-100 litres, Upto 350 bar, 500°C
Monel 400 High Pressure Reactors Monel 400 Hydrogenators50 ml -50000 litres, Upto 150 bar, 500°C
Monel 400 Continuous Stirred Tank Reactor50 ml-100 litres, Upto 350 bar, 500°C
Monel 400 Non-Stirred Pressure Vessels50 ml-100 litres, Upto 350 bar, 500°C
Monel 400 Catalyst Filters for Precious MetalsAs per requirement
Monel 400 Magnetic DriveAs per requirement
Monel 400 Mini Magnetic CouplingNano-20, Nano-40, Nano-80

All Products, Product Specifications and Data are subject to change.

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