MONEL ALLOY 400
 
 
Compared to steel, Monel is very difficult to machine as it work-hardens very quickly. It needs to be turned and worked at slow speeds and low feed rates. It is resistant to corrosion and acids, and some alloys can withstand a fire in pure oxygen. It is commonly used in applications with highly corrosive conditions. Small additions of aluminium and titanium form an alloy (K-500) with the same corrosion resistance but with much greater strength due to gamma prime formation on aging. Monel is typically much more expensive than stainless steel.
 
Monel alloy 400 has a specific gravity of 8.83, an electrical conductivity of approximately 3.4% IACS, and (in the annealed state) a hardness of 65 Rockwell B.
 

In what applications is Monel 400 used?

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

UNS N04400 Chemical Composition in %

 

C

Mn

S

Si

Ni

Cu

Fe

.30 max

2.00 max

.024 max

.50 max

63.0 min

28.0-34.0

2.50 max