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Monel 400
Monel 400 is a Nickel-Copper alloy, resistant to sea water and steam at high temperatures as well as to salt and caustic solutions.
Monel 400 is a nickel-copper alloy with excellent corrosion resistance in a wide variety of media. Monel 400 is characterized by good general corrosion resistance, good weldability and moderate to high strength. The alloy has been used in a variety of applications. It has excellent resistance to rapidly flowing brackish water or seawater. It is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. The alloy is slightly magnetic at room temperature. Monel 400 is widely used in the chemical, oil and marine industries.
UNS N04400 Chemical Composition (% max or range).
| Chemical Requirements | |||||||
|---|---|---|---|---|---|---|---|
| Ni | C | Mn | S | Si | Cu | Fe | |
| Max | 0.3 | 2.00 | 0.024 | 0.5 | 34.0 | 2.50 | |
| Min | 63.0 | 28.0 | |||||
UNS N04400 Mechanical properties
| Mechanical Property Requirements | |||||
|---|---|---|---|---|---|
| Ultimate Tensile | Yield Strength (0.2% OS) | Elong. in 2 in. or 50mm (or 4D), min.,% | R/A | Hardness | |
| Cold Worked/SR | |||||
| Min | 87 KSi | 60 KSi | 20B | ||
| Max | |||||
| Min | 600 MPa | 415 MPa | |||
| Max | |||||
| Hot Worked/SR | |||||
| Min | 80 KSi | 40 KSi | 30D | ||
| Max | |||||
| Min | 552 MPa | 276 MPa | |||
| Max | |||||
Characteristics
- Corrosion resistance in an extensive range of marine and chemical environments. From pure water to nonoxidizing mineral acids, salts and alkalis.
- This alloy is more resistant to nickel under reducing conditions and more resistant than copper under oxidizing conditions, it does show however better resistance to reducing media than oxidizing.
- Good mechanical properties from subzero temperatures up to about 480C.
- Good resistance to sulfuric and hydrofluoric acids. Aeration however will result in increased corrosion rates. May be used to handle hydrochloric acid, but the presence of oxidizing salts will greatly accelerate corrosive attack.
- Resistance to neutral, alkaline and acid salts is shown, but poor resistance is found with oxidizing acid salts such as ferric chloride.
- Excellent resistance to chloride ion stress corrosion cracking.
Propeller and pump shafts.
Feed water and steam generator tubing.
Brine heaters, sea water scrubbers in tanker inert gas systems.
Sulfuric acid and hydrofluoric acid alkylation plants.
Pickling bat heating coils.
Heat exchangers in a variety of industries.
Transfer piping from oil refinery crude columns.
Plant for the refining of uranium and isotope separation in the production of nuclear fuel.
Pumps and valves used in the manufacture of perchlorethylene, chlorinated plastics.
Monoethanolamine (MEA) reboiling tube.
Cladding for the upper areas of oil refinery crude columns.
Heat Treatment
Solution annealing at 1100°C followed by water quenching
Monel Alloy 400 Stud Bolt Specification
Material: Monel Alloy 400 UNS N04400 DIN W.Nr.2.4360
Standard:DIN 975,Fully Threaded Stud Bolts, ASME B18.2.1, B18.2.3.5M
Size: 1/2 inch to 4in .M12-M100
Length: as per request