Monel Steel 400

Owing to the high performance and excellent corrosion resistance, our Monel Steel 400 is in hige demand in the market. We offer Monel Steel 400 in various forms of bar, sheet, forgings, coil, platye, etc., as per the demand of the clients. our Monel Steel 400 is used in chemical, oil and marine industries.

  • Corrosion resistance in an extensive range of marine and chemical environments. From pure water to nonoxidizing mineral acids, salts and alkalis.
  • This alloy is more resistant to nickel under reducing conditions and more resistant than copper under oxidizing conditions, it does show however better resistance to reducing media than oxidizing.
  • Good mechanical properties from subzero temperatures up to about 480C.
  • Good resistance to sulfuric and hydrofluoric acids. Aeration however will result in increased corrosion rates. May be used to handle hydrochloric acid, but the presence of oxidizing salts will greatly accelerate corrosive attack.
  • Resistance to neutral, alkaline and acid salts is shown, but poor resistance is found with oxidizing acid salts such as ferric chloride.
  • Excellent resistance to chloride ion stress corrosion cracking.

  • Feed water and steam generator tubing.
  • Brine heaters, sea water scrubbers in tanker inert gas systems.
  • Sulfuric acid and hydrofluoric acid alkylation plants.
  • Pickling bat heating coils.
  • Heat exchangers in a variety of industries.
  • Transfer piping from oil refinery crude columns.
  • Plant for the refining of uranium and isotope separation in the production of nuclear fuel.
  • Pumps and valves used in the manufacture of perchlorethylene, chlorinated plastics.
  • Monoethanolamine (MEA) reboiling tube.
  • Cladding for the upper areas of oil refinery crude columns.
  • Propeller and pump shafts.


Chemical Requirements

Tensile Data

Mechanical Property Requirements
Ultimate TensileYield Strength (0.2% OS)Elong. in 2 in. or 50mm (or 4D), min.,%R/AHardness
Cold Worked/SR
Min87 KSi60 KSi20B
Min600 MPa415 MPa
Hot Worked/SR
Min80 KSi40 KSi30D
Min552 MPa276 MPa

  • B- not applicable to diameters or cross sections under 3/32 in (2.4mm)
  • D-For hot-worked flats 5/16 in. (7.9mm) and under in thickness the elongation shall be 20% min.


Metal TypeUNS N04400
BarASTM B164 QQ-N-281 Din 17750
SheetASTM B127 QQ-N-281
PlateASTM B127 QQ-N-281
PipeASTM B165
TubeASTM B165
ForgingASTM B564
Weld WireFM 60/ ERNiCu-7/ 17753
Weld ElectrodeFM 190 ENiCu-7


Machining Data
Carbide tools are suggested for rates better than 50% of Type 304.
Machining TypeSuggested starting rates are:
Single Point turning :Roughing - 0.15" depth, 0.015"/rev feed -175 SFM
Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM
Drilling :1/4" Dia hole - 0.004"/rev feed - 60 SFM
1/2" Dia hole - 0.007"/rev feed - 60 SFM
3/4" Dia hole - 0.010"/rev feed - 60 SFM
Reaming :Feed - same as drilling - 100 SFM
Side and Slot Milling :Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM
Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM
These rates are for carbide tools
Type C-2 for roughing, drilling and reaming
Type C-3 for finishing