Alloy 400
Monel Alloy 400 is a nickel-copper alloy used for offshore, marine and chemical processing. As a solution strengthened material, Monel Alloy 400 displays good strength, toughness and corrosion resistance at temperatures up to 538°C.
It's corrosion resistance is particular strong in flowing brackish water or seawater. Monel 400 exhibits good resistance to hydrofluoric and dilute non-oxidising acids, alkalis and salts. It resists corrosion by dry chlorine and hydrogen chloride and is not susceptible to stress corrosion cracking. Monel Alloy 400 is readily cold formable and weldable.
Quken offers Monel 400 in following forms:
| Product form | Standard | Size available mm |
|---|---|---|
| Strip | ASME SB127 | 0.05~2*3~540*C |
| Plate | ASME SB127 | 6~25*1000~1500*2000~6000 |
| Flanges | ASME SB564 | Custom |
| Seamless pipe/tube | ASME SB165 SB163 SB829 | φ5~120*0.5~16*9000 Max |
| Welded pipe/tube | ASME SB725 SB730 SB751 SB775 | φ40~630*2~16*13000 Max |
| Bar | ASME SB164 AMS 4675 | φ3.5~300*100~6000 |
| Wire | ASME SB164 AMS 4675 | φ1~3*C |
| Pipe fittings | ASME B366 | Custom |
| Forgings | ASME SB564 | Custom |
Designations and standards:
| Standard | Material designation |
|---|---|
| EN | 2.4360 - NiCu30Fe |
| ISO | NiCu30 |
| UNS | N04400 |
| AFNOR | NU 30 |
Chemical composition %:
| Ni | Cu | Fe | C | Mn | S | Si | |
|---|---|---|---|---|---|---|---|
| MIN. | 63.0 | 28.0 | |||||
| MAX. | 70.0 | 34.0 | 2.5 | 0.3 | 2.0 | 0.024 | 0.5 |
Corrosion resistence
The alloy is exceptionally resistant to chloride stress corrosion cracking. Application in waters, including sea and brackish water is a major use of the material. Alloy 400 is also resistant to stress corrosion cracking and pitting in most fresh and industrial waters.
Alloy 400 offers exceptional resistance to hydrofluoric acid in all concentrations up to the boiling point. It is perhaps the most resistant of all commonly used engineering alloys. Alloy 400 is also resistant to many forms of sulfuric and hydrochloric acids under reducing conditions.
Mechanical Properties:
| Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation In 2inches | Hardness | |||
|---|---|---|---|---|---|---|
| KSI | MPa | KSI | MPa | % | Brinell (3000-kg) | Rockwell HRC |
| 25.0-28.0 Min | 170-195 Min | 70 Min | 480 Min | 35 Max | - | 35 Max- |
Physical Constants:
| Density | 0.319 lb/in3, 8.8g/cm3 |
| Melting Point (Approx.) | 2460°F/1350°C |
| Electrical Resistivity | 51 Microhm·cm |
| Thermal Expansion Coefficient (25° to 100°C) | 13.9 × 10-6/°C |
| Thermal Conductivity | 21.8 W/m·K |
| Magnetic Attraction | None |
Applications
- Packed columns
- Heat exchangers
- Pressure vessels and reactors
- Pump and valve components
- Pipe work and pipe spools
- Brine heaters