Monel Alloy 400: A Comprehensive Guide
Monel Alloy 400 is a nickel-copper alloy known for its excellent corrosion resistance, high strength, and versatility across a variety of industries. Whether you are an engineer, manufacturer, or just interested in advanced materials, this article will help you understand all about Monel Alloy 400, including its properties, applications, and why so many industries choose it.
What is Monel Alloy 400?
Monel 400 alloy is a solid solution binary alloy consisting primarily of nickel (63-70%) and copper (28-34%), with smaller amounts of iron, manganese, carbon and silicon. The alloy was developed by the International Nickel Company (INCO) in the early 20th century and is named after Ambrose Monell, the company's president at the time. Its unique composition gives it a combination of strength, ductility and corrosion resistance, making it the material of choice for challenging applications.
Monel Alloy 400 Data Sheet
Equivalent Standards
| Country/Standard | Equivalent Grade |
|---|---|
| USA (ASTM) | UNS N04400 |
| Germany (DIN) | 2.4360 |
| Japan (JIS) | NW 4400 |
| UK (BS) | NA 13 |
| France (AFNOR) | NU 30 |
| China (GB) | NS 111 |
Chemical Composition (%)
| Element | Composition (%) |
|---|---|
| Ni | 63-70 |
| Cu | 28-34 |
| Fe | ≤ 2.5 |
| Mn | ≤ 2.0 |
| C | ≤ 0.3 |
| Si |
≤ 0.5 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 550-750 MPa (80-110 ksi) |
| Yield Strength (0.2% offset) | 240-450 MPa (35-65 ksi) |
| Elongation (% in 50 mm) | 20-40% |
| Hardness (Rockwell B) | 65-95 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ (0.318 lb/in³) |
| Melting Range | 1300-1350°C (2370-2460°F) |
| Thermal Conductivity | 21.8 W/m·K (12.6 BTU·in/hr·ft²·°F) |
| Electrical Resistivity | 0.486 µΩ·m |
| Magnetic Permeability | ≤ 1.001 |
Key Properties of Monel Alloy 400
Corrosion Resistance
Monel Alloy 400 has excellent corrosion resistance in both freshwater and saltwater environments. It is particularly resistant to sulfuric acid, hydrofluoric acid, and alkaline solutions, making it commonly used in marine and chemical processing applications.
High Strength
The alloy maintains its strength over a wide temperature range, from cryogenic conditions to 1000°F (538°C). This makes it suitable for high-stress environments.
Thermal Conductivity
Monel Alloy 400 has excellent thermal conductivity, which benefits heat exchangers and other thermal management systems.
Ductility and Toughness
Despite its high strength, the alloy is highly ductile, so it can be easily formed into a variety of shapes.
Magnetism
Monel Alloy 400 is non-magnetic, making it an option for applications in the electronics and aerospace industries.
