Mechanical Properties
Typical room temperature Tensile Properties of Annealed Material
Product Form |
Condition |
Tensile (ksi) |
.2% Yield (ksi) |
Elongation (%) |
Hardness (HRB) |
|---|---|---|---|---|---|
|
Rod & Bar
|
Annealed
|
75-90
|
25-50
|
60-35
|
60-80
|
|
Rod & Bar
|
Cold-Drawn Stress Relieved
|
84-120
|
55-100
|
40-22
|
85-20 HRC
|
|
Plate
|
Annealed
|
70-85
|
28-50
|
50-35
|
60-76
|
|
Sheet
|
Annealed
|
70-85
|
30-45
|
45-35
|
65-80
|
|
Tube & Pipe Seamless
|
Annealed
|
70-85
|
25-45
|
50-35
|
75 max* |
ASTM Specifications
Pipe Smls |
Pipe Welded |
Tube Smls |
Tube Welded |
Sheet / Plate |
Bar |
Forging |
Fitting |
Wire |
|---|---|---|---|---|---|---|---|---|
|
B165
|
B725
|
B163
|
B127
|
B164
|
B564
|
B366
|
|
Physical Properties of Monel 400
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ |
| Melting Point | 1,300 – 1,400 °C |
| Thermal Conductivity | 35 W/m·K |
| Electrical Resistivity | 0.49 x 10⁻⁶ Ω·m |
| Yield Strength (at 20°C) | 240 MPa |
| Tensile Strength (at 20°C) | 550 MPa |
| Elongation (in 50 mm) | 40% |
What are the characteristics of Monel 400?
- Resistant to seawater and steam at high temperatures
- Excellent resistance to rapidly flowing brackish water or seawater
- Excellent resistance to stress corrosion cracking in most freshwaters
- Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated
- Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom the material of choice for these acids
- Excellent resistance to neutral and alkaline salt
- Resistance to chloride induced stress corrosion cracking
- Good mechanical properties from sub-zero temperatures up to 1020° F
- High resistance to alkalis
Corrosion Resistant Monel 400
Alloy 400 is virtually immune to chloride ion stress corrosion cracking in typical environments. Generally, its corrosion resistance is very good in reducing environments, but poor in oxidizing conditions. It is not useful in oxidizing acids, such as nitric acid and nitrous. Nevertheless, it is resistant to most alkalis, salts, waters, food products, organic substances and atmospheric conditions at normal and elevated temperatures.
This nickel alloy is attacked in sulfur-bearing gases above approximately 700° F and molten sulfur attacks the alloy at temperatures over approximately 500° F.
Monel 400 offers about the same corrosion resistance as nickel but with higher maximum working pressures and temperatures and at a lower cost due to its superior ability to be machined.
In what applications is Monel 400 used?
- 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