MONEL® alloy R405


MONEL R405 (UNS N04405)

Ni 63.0 Cu 31.0 S 0.04 Fe 2.5 Mn 2.0 C 0.3 Si 0.5 S 0.043


MONEL R405 is a Nickel-Copper alloy, resistant to sea water and steam at high temperatures as well as to salt and caustic solutions.
MONEL R405 is a nickel-copper alloy with excellent corrosion resistance in a wide variety of media. MONEL R405 is characterized by good general corrosion resistance and moderate to high strength. MONEL R405 has been used in a variety of applications. It has excellent resistance to rapidly flowing brackish water or seawater. It is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. MONEL R405 is slightly magnetic at room temperature. MONEL R405 is widely used in the 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.
MONEL R405 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.

*Due to sulfur addition for free machining, welding is not possible for MONEL R405.


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
Min85 KSi50 KSi15
Min585 MPa345 KPa
Hot Worked/SR
Min75 KSi35 KSi30
Min517 MPa241 MPa


Metal TypeUNS N04405
BarASTM B164 QQ-N-281
SheetASTM B127 QQ-N-281
PlateASTM B127 QQ-N-281
ForgingASTM B564
Weld Wire 
Weld ElectrodeFM 190/ ENiCu-7
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.