Monel 400 Alloy Steel Bar


Monel 400 is a nickel-copper alloy (about 67% Ni – 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Monel 400 is a solid solution alloy that can only be hardened by cold working. Monel 400 alloy (UNS N04400 or MCu-28-1.5-1.8 or Ni68Cu28Fe) is a kind of in sea water, chemical solvents, ammonia sulfur chloride, hydrogen chloride, various acidic media such as sulfuric acid, hydrofluoric acid, hydrochloric acid, phosphoric acid, organic acid , Nickel-based alloy materials with good corrosion resistance in alkaline media, salt and molten salt .


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 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 has great mechanical properties at subzero temperatures, can be used in temperatures up to 1000° F, and its melting point is 2370-2460° F. However, alloy 400 is low in strength in the annealed condition so, a variety of tempers may be used to increase the strength.


Chemical Composition:


Physical properties:

Density0.318 lb / in3 or 8.80g/cm3
Elastic Modulus26 000 ksi
Heating energy0.427 J/g-°C
Coefficient of thermal expansion, in./in./ F x 106 
70-400 F8.6
70-800 F8.9
70-1000 F9.1

Mechanical Properties:

ShapeTensile strengthYield Strength (0.2% Offset)Elongation, %Hardness   
 ksiMPa Brinell (3000-kg)Rockwell B  
sheet70-120482-82730-110207-75845-2 65min
belt70-140482-96525-130172-89650-2 68min
Seamless pipe70-130482-89625-110172-75850-3 100max
Cold drawn wire70-180482-124130-170207-117245-2 

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