About Alloy
Monel 400 (UNS N04400/. W.Nr. 2.4360 and 2.4361) 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. 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 fresh waters, 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, monel 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, monel 400 is low in strength in the annealed condition so, a variety of tempers may be used to increase the strength.
Product Form
Sheet/Plate/Strip:ASTM B127, AMS 4544
Forging: ASTM B564, DIN 17752, AMS 4675
Bar: ASTM B164, DIN 17752, AMS 4675
Tube: ASTM B165, AMS 4574, AMS 4575
Pipe: ASTM B 185
Chemical Composition
| C | Mn | S | Si | Ni | Cu | Fe |
| 0.3 max | 2.0 max | 0.24 max | 0.5 max | 63 min | 28-34 | 2.5 max |
Property
| Form | Condition | Tensile (Ksi) | 0.2% Yield (Ksi) | Elongation % | Hardness (HRB) |
| Bar | Annealed | 75-90 | 25-50 | 60-35 | 60-80 |
| Bar | Cold drawn | 84-120 | 55-100 | 40-22 | 20-85 |
| Plate | Annealed | 70-85 | 28-50 | 50-35 | 60-76 |
| Sheet | Annealed | 70-85 | 30-45 | 45-35 | 65-80 |
| Pipe | Annealed | 70-85 | 25-45 | 50-35 | 75 max |
Application
Marine engineering
Chemical and hydrocarbon processing equipment
Gasoline and freshwater tanks
Crude petroleum stills
De-aerating heaters
Boiler feed water heaters and other heat exchangers
Valves, pumps, shafts, fittings, and fasteners
Industrial heat exchangers
Chlorinated solvents
Crude oil distillation towers
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