General Properties
Alloy 400 (UNS N04400) is a nickel-copper alloy with excellent resistance to a wide range of corrosive environments. It is resistant to chloride stress corrosion cracking and has high strength and toughness over a wide range of temperatures.
The alloy is used extensively in many corrosive applications especially in the marine and chemical processing industries. Alloy 400 is readily fabricated by conventional processing operations.
Alloy 400AR is produced in the as-rolled condition to meet higher strength requirements.
Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
| Nickel (plus Cobalt) | 63.0 min.-70.0 max. | Iron | 2.50 |
| Copper | 28.0 min.-34.0 max. | Sulfur | 0.024 |
| Carbon | 0.3 | Silicon | 0.5 |
| Manganese | 2.0 |
Physical Properties
Density
0.318 lbs/in3
8.80 g/cm3
Specific Heat
0.102 BTU/lb-°F (68°F)
427 J/kg-°K (20°C)
Modulus of Elasticity
26.4 x 103 ksi (68°F)
182 GPa (20°C)
Thermal Conductivity 200°F (100°C)
150 BTU/hr/ft2/ft/°F (68°F)
22.0 W/m-°K (20°C)
Melting Range
2370 – 2460°F
1300 – 1350°C
Electrical Resistivity
307 Microhm-in at 70°C
0.511 Microhm-cm at 21°C
Mean Linear Expansion
| Temperature | Mean Linear Expansiona | ||
|---|---|---|---|
| °F | °C | in/in/°F x 10-6 | um/m•°C |
| -320 | -200 | — | — |
| -300 | -180 | 6.1 | 11.1 |
| -200 | -130 | 6.4 | 11.4 |
| -100 | -70 | 6.7 | 12.1 |
| 70 | 21 | — | — |
| 200 | 100 | 7.7 | 14.2 |
| 400 | 200 | 8.6 | 15.2 |
| 600 | 300 | 8.8 | 15.7 |
| 800 | 400 | 8.9 | 16.1 |
| 1000 | 500 | 9.1 | 16.3 |
| 1200 | 600 | 9.3 | 16.6 |
| 1400 | 700 | 9.6 | 17.0 |
| 1600 | 800 | 9.8 | 17.4 |
| 1800 | 900 | 10.0b | 17.7 |
| 2000 | 1000 | 10.3b | 18.1b |
(a) annealed material, (b) extrapolated
Mechanical Properties
Nominal Room-Temperature Mechanical Properties of Alloy 400 and 400AR
| FORM AND CONDITION | Yield Strength 0.2% Offset | Tensile Strength | Elongation, % | Hardness | |||
|---|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | Brinell (3000-kg) | Rockwell B | ||
| Plate | |||||||
| Hot-Rolled, As-Rolled | 40-75 | 276-517 | 75-95 | 517-655 | 45-30 | 125-215 | 70-96 |
| Hot-Rolled, Annealed | 28-50 | 193-345 | 70-85 | 482-586 | 50-35 | 110-140 | 60-76 |
