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MONEL 400

MONEL 400

 

UNS N04400

Other common names: Alloy 400

 

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. Alloy 400 is a solid solution alloy that can only be hardened by cold working. 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.

 

 

Product Forms

  • Sheet
  • Plate
  • Bar
  • Pipe & Tube (welded & seamless)
  • Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
  • Wire

 

General Properties

Alloy 400 (UNS N04400) is a ductile nickel-copper alloy with resistance to a variety of corrosive conditions. The alloy is most frequently specified in environments ranging from mildly oxidizing through neutral and in moderately reducing conditions. An additional application area of the material is in marine environments and other nonoxidizing chloride solutions.

 

The alloy has a long history of use as a corrosion resistant material, dating back to the early 20th century when it was developed as an attempt to use a high copper content nickel ore. The nickel and copper contents of the ore were in the approximate ratio which is now formally specified for the alloy.

 

As with commercially pure nickel, Alloy 400 is low in strength in the annealed condition. For this reason, a variety of tempers are used which have the effect of increasing the strength level of the material.

 

 


Applications

Marine and chemical processing equipment
Valves, pumps, propeller shafts
Marine fixtures and fasteners
Gasoline and fresh water tanks
Process vessels and piping
Heat exchangers
 

 

Standards


ASTM Specifications


Pipe Smls     ASTM B165 
Pipe Welded ASTM B725 
Tube Smls    ASTM B163 

Sheet/Plate  ASTM B127 
Bar              ASTM  B164

 

 
 
Date:2011-1-10
Last:DUPLEX 2760
Next:HASTELLOY C276

 

 

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