Monel 400 (UNS N04400) Seamless Pipes & Tubes
Monel 400 (UNS N04400) is a nickel-copper alloy with excellent resistance to seawater, hydrofluoric acid, and many reducing acids. The combination of nickel and copper creates a material that is virtually immune to chloride stress corrosion cracking, making it the industry standard for marine and seawater applications.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
4 specs
Chemical Composition (% by weight)
| Ni | Cu | Fe | C | Mn | Si | S |
|---|---|---|---|---|---|---|
| 63.0 min | 28.0-34.0 | 2.5 max | 0.30 max | 2.00 max | 0.50 max | 0.024 max |
Mechanical Properties (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 517 MPa min | 172 MPa min | 35% min | N/A |
Physical Properties - Monel 400
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 8.80 g/cm3 | 1300-1350 C | 21.8 W/m-K | 510 nOhm-m | 427 J/kg-K | 13.9 um/m-C |
Corrosion Resistance - Monel 400
| Property | Value |
|---|---|
| Pitting Resistance (PREN) | N/A (Ni-Cu alloy) |
| Max Service Temp (Oxidizing) | 480 C |
| Intergranular Corrosion | Resistant |
| Stress Corrosion Cracking | Excellent in most environments |
| General Corrosion Rate | Excellent in reducing acids and seawater |
| Seawater Resistance | Outstanding - industry standard |
Equivalent International Grades
| ASTM | Trade | DIN |
|---|---|---|
| N04400 | Monel 400 | 2.4360 |
Monel 400 vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| Alloy 825Nickel-Iron-Chromium-Molybdenum Alloy | N08825 | 586 MPa min | 241 MPa min | ~31 | 540 C |
| Alloy 625Nickel-Chromium-Molybdenum Alloy | N06625 | 827 MPa min | 414 MPa min | >50 (exceptional) | 980 C |
| Alloy C-276Nickel-Molybdenum-Chromium Alloy | N10276 | 690 MPa min | 283 MPa min | >70 (highest available) | 1093 C |
Applicable Standards
Applications
Key Advantages of Monel 400
Monel 400 Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Standard for seawater systems, desalination equipment, and marine hardware in UAE, Saudi Arabia, Qatar, and Oman.
Europe (Germany, UK, Norway, Netherlands, Italy)
Widely used in marine, chemical, and offshore applications in Norway, UK, Netherlands, and Germany.
United States
Industry standard for marine, naval, and chemical processing applications.
Frequently Asked Questions about Monel 400 Seamless Pipes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Related Content
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