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Monel Alloy 400

Monel Alloy 400

Monel 400 is a nickel-copper alloy (about 23% Cu–67% Ni ) 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 weldability, good corrosion resistance 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 hydrofluoric and hydrochloric 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

Physical Properties

Density, g/cm3 ………………………………..8.80
Density, lb/in.3 ………………………………..0.318
Melting Range, °F …………………………….2370-2460
Melting Range, °C ………………………….   1300-1350
Modulus of Elasticity, 103 ksi
Tension ……………………………………………26.0
Compression …………………………………….26.0
Torsion………………………………………………9.5
Poisson’s Ratio……………………………………0.32
Curie Temperature, °F ………………………..70-120
Curie Temperature,°C ………………………….21-49

Chemical Composition

Nickel (plus Cobalt) ……………..63.0 min.
Carbon………………………………..0.3 max.
Manganese ………………………….2.0 max.
Iron……………………………………..2.5 max.
Sulfur ………………………………….0.024 max.
Silicon …………………………………0.5 max.
Copper ………………………………..28.0 – 34.0

Designation & Standards

Plate, Sheet, and Strip: BS3072NA13 (Sheet and Plate),BS3073NA13 (Strip), ASTM B 127, ASME SB 127 (Plate,
Sheet, and Strip), SAE AMS 4544 (Sheet, Strip, and Plate),DIN 17750 (Plate, Strip and Sheet), QQ-N-281 (Plate,
Sheet, Strip, Bar, Rod, Wire, and Forgings)

Bar, Rod, Wire, and Forgings: BS3075NA13 (Wire),BS3076NA13 (Bar), ASTM B 164 (Rod, Bar, and Wire),
ASTM B 564 (Forgings), ASME SB 164 (Rod, Bar, and Wire), ASME SB 564 (Forgings), AECMA PrEN 2305
(Wire for Rivets), SAE AMS 4675 (Bars and Forgings),SAE AMS 4730 (Wire), SAE AMS 4731 (Wire and
Ribbon), DIN 17752 (Rod and Bar), DIN 17753 (Wire),DIN 17754 (Forgings), VdTÜV 263 (Sheet, Plate, Bar, and
Tubing), QQ-N-281 (Plate, Sheet, Strip, Bar, Rod, Wire,and Forgings)

Pipe and Tube: BS3074NA13 (Tube), ASTM B 163(Condenser and Heat Exchanger Tube), ASTM B 165
(Seamless Pipe and Tube), ASTM B 725 (Welded Pipe),ASTM B 730 (Welded Tube), ASTM B 751 (Welded
Tube), ASTM B 775 (Welded Pipe), ASTM B 829(Seamless Pipe and Tube), ASME SB 163 (Condenser and
Heat Exchanger Tubes), ASME SB 165 (Seamless Pipe and Tube), ASME SB 725 (Welded Pipe), ASME SB 730
(Welded Tube), ASME SB 751 (Seamless and Welded Tube), ASME SB 775 (Seamless and Welded Pipe), ASME
SB 829 (Seamless Pipe and Tube), SAE AMS 4574(Seamless Tubing), DIN 17751 (Pipe and Tube), VdTÜV
263 (Sheet, Plate, Bar, and Tubing)

Welding Products– MONEL Filler Metal 60-AWS A5.14/ERNiCu-7; MONEL Welding Electrode 190-AWS
A5.11/ENiCu-7.

Other Products –ASTM B 366, ASME SB 366 (Welded Fittings), SAE AMS 7233 (Rivets), DIN 17743 (Chemical
Composition)

Applications

Common applications of  Alloy 400 are:

  • Feedwater and steam generator tubes in power plants
  • Brine heater and recompression evaporator in saltworks
  • Sulfuric and hydrofluoric acid alkylation
  • Heat exchangers in the chemical industry
  • Plating components for mineral oil distillation plants
  • Splash zone lining on offshore platforms
  • Impellers and pump shafts in marine technology
  • Refining plants for the production of nuclear fuel
  • Pumps and valves in production lines for tetrachlorethylene (perchlorethylene) and chlorinated plastics
  • Heating tubes for monoethanolamine (MEA)
  •  Sour-gas resistant components for oil and gas production