Monel 400 alloy (UNS N04400 or MCu-28-1.5-1.8 or Ni68Cu28Fe) is a nickel-based alloy material with good corrosion resistance in seawater, chemical solvents, ammonia, sulfur, chlorine, hydrogen chloride, various acidic media such as sulfuric acid, hydrofluoric acid, hydrochloric acid, phosphoric acid, organic acids, alkaline media, salts and molten salts.
 MONEL nickel alloy is a solid solution alloy that can be hardened by the process of cold working.
MONEL is a trademark of Special Metals Corporation under which a series of nickel-copper alloys are grouped. Commercially there are many types of MONEL available, such as alloy 400, alloy 401, alloy R-405, Alloy K-500 and Monel 404.
The Monel 400 alloy is also known as super alloy monel. This alloy is available in some standard shapes such as hexagon, round, tube, pipe, plate, strip, sheet and wire.
The proportions of copper and nickel used to make monel are the same as that found in the nickel ore found in Ontario mines. This alloy exhibits good corrosion resistance. This datasheet will look into the chemical composition, properties and applications of MONEL 400 alloy.
The chemical composition of MONEL 400 alloy is given in the following table.
| Element | Content (%) |
|---|---|
| Nickel, Ni | Remainder |
| Copper, Cu | 28-34 |
| Iron, Fe | 2.5 max |
| Manganese, Mn | 2 max |
| Silicon, Si | 0.5 max |
| Carbon, C | 0.3 max |
| Sulphur, S | 0.024 |
The mechanical properties of MONEL 400 alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength(annealed) | 517-620 MPa | 75-90 ksi |
| Yield strength | 172-345 MPa | 25-50 ksi |
| Modulus of elasticity | 179 GPa | 26000 ksi |
| Poisson’s ratio | 0.32 | 0.32 |
Some of the other designations that are usedto denote MONEL 400 alloy are as below:
AMS 4574
AMS 4675
AMS 4731
ASTM B163
ASTM B165
ASTM F96
UNS NO4400
The machinability of MONEL 400 is difficult as it work-hardens during machining. The conventional machining techniques used on iron alloys may be used for this alloy.
Welding methods including gas-arc welding, metal-arc welding, gas-metal-arc welding and submerged-arc welding are recommended on this alloy.
Forging of this alloy is to be done by controlled procedures.
Hot working on this alloy needs to be done by choosing proper temperatures. Typical temperatures for hot working range between 648-1176°C (1200-2150°F).
Cold working may be done using soft die materials for better finishing.
MONEL 400 alloy may be annealed at 926°C (1700°F).
The MONEL 400 alloy is used in the following applications:-
 MONEL nickel alloy is a solid solution alloy that can be hardened by the process of cold working.
MONEL is a trademark of Special Metals Corporation under which a series of nickel-copper alloys are grouped. Commercially there are many types of MONEL available, such as alloy 400, alloy 401, alloy R-405, Alloy K-500 and Monel 404.
The Monel 400 alloy is also known as super alloy monel. This alloy is available in some standard shapes such as hexagon, round, tube, pipe, plate, strip, sheet and wire.
The proportions of copper and nickel used to make monel are the same as that found in the nickel ore found in Ontario mines. This alloy exhibits good corrosion resistance. This datasheet will look into the chemical composition, properties and applications of MONEL 400 alloy.
The chemical composition of MONEL 400 alloy is given in the following table.
| Element | Content (%) |
|---|---|
| Nickel, Ni | Remainder |
| Copper, Cu | 28-34 |
| Iron, Fe | 2.5 max |
| Manganese, Mn | 2 max |
| Silicon, Si | 0.5 max |
| Carbon, C | 0.3 max |
| Sulphur, S | 0.024 |
The mechanical properties of MONEL 400 alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength(annealed) | 517-620 MPa | 75-90 ksi |
| Yield strength | 172-345 MPa | 25-50 ksi |
| Modulus of elasticity | 179 GPa | 26000 ksi |
| Poisson’s ratio | 0.32 | 0.32 |
Some of the other designations that are usedto denote MONEL 400 alloy are as below:
AMS 4574
AMS 4675
AMS 4731
ASTM B163
ASTM B165
ASTM F96
UNS NO4400
The machinability of MONEL 400 is difficult as it work-hardens during machining. The conventional machining techniques used on iron alloys may be used for this alloy.
Welding methods including gas-arc welding, metal-arc welding, gas-metal-arc welding and submerged-arc welding are recommended on this alloy.
Forging of this alloy is to be done by controlled procedures.
Hot working on this alloy needs to be done by choosing proper temperatures. Typical temperatures for hot working range between 648-1176°C (1200-2150°F).
Cold working may be done using soft die materials for better finishing.
MONEL 400 alloy may be annealed at 926°C (1700°F).
The MONEL 400 alloy is used in the following applications:-
