Monel 400

Category: .
Tag: .

Product Description

Monel 400

Monel 400

Monel 400 Alloy is a single-phase solid-solution Ni-Cu alloy with excellent corrosion resistance to a wide range of media.
• corrosion resistance in a wide range of marine and chemical environments
• freedom from chloride induced stress-corrosion cracking
• good mechanical properties from sub-zero temperatures up to about 550℃
• approved for pressure vessels with wall temperatures from -10 to 425 ℃ according to VdTUV-Wbl. 263 and up to 900℃             according to ASME Boiler and Pressure Vessel Code.
• good workability and weldability


Density: 8.83
Corrosion resistance

Monel 400 Alloy has outstanding resistance to neutral and alkaline salt solutions. It has been a standard material for salt plants for many years. This alloy is one of the few metallic materials which can be used in contact with fluorine, hydrofluoric acid, hydrogen fluoride or their derivatives. Monel 400 Alloy shows very high resistance to caustic alkalies. Behaviour in seawater is also excellent, with improved resistance to cavitation corrosion compared with copper-base alloys. It can be used in contact with dilute solutions of mineral acids such as sulphuric and hydrochloric acids, particularly if they are air-free. However, as the alloy contains no chromium, corrosion rates may increase significantly under oxidizing conditions. Whilst Monel 400 Alloy can be considered immune to chlorideion stress cracking, it can stress crack in the presence of mercury or in moist aerated HF vapours. A stressrelieving heat treatment is applied in such cases.


Applications of Monel 400:

Typical applications are:
•feed-water and steam generator tubing in power plants
•brine heaters and evaporator bodies in seawater desalination plants
•sulphuric and hydrofluoric acid alkylation plants
•sulphuric and hydrofluoric acid alkylation plants
•cladding for crude oil distillation columns
•splash-zone sheathing in offshore structures
•propeller and pump shafts for seawater service
•plants for uranium refining and isotope separation in the production of nuclear fuel
•pumps and valves used in the manufacture of chlorinated hydrocarbons
•monoethanolamine (MEA) reboiler tubes
•valves and heat exchangers exposed to oxygen at higher temperatures, pressure and concentration of oxygen to avoid combustion and ignition through oxygen
•sour gas environment: Nicorros is listed in NACE Standard MR0175 (“Sulfide Stress Cracking Resistant Metallic


Materials for Oilfield Equipment”) as acceptable up to a maximum hardness value of 35 HRC

Chemical composition

 Ni  Fe  C  Mn  Si  Cu  Al  S
 min(%)  bla  28.0
 max(%)  2.5  0.3  2.00  0.50  34.0  0.024

Mechanical properties

 Condition  Yield Strength(Mpa)  Tensile Strength(Mpa)  Elongation(%)  Hardness(HB)
 ASTM Min Value  Soft Annealed  170  480  35
 Typical Values at RT  Hot worked  490  637  45  190
 Typical Values at RT  Cold worked Stress Relieved  539  686  30  110
 Typical Values at RT  Soft Annealed  255  135  48  135

International Specification Comparison chart

 Material  Round Bar  Plate  Pipe
 Seamless  Welded
 B164  B127  B163/165
 ASME  SB164  SB127  SB163/165
 JIS  NW4400  H4553  H4551  H4552
 DIN  2.4360  17752  17750  17751

Product: Sheet, Coil, Pipe, Bar, Wire and Forgings