ASTM B165 UNS N04400 Monel 400 Seamless Pipes
Introduction
ASTM B165 UNS N04400 refers to the standard specification for cold-worked, seamless pipes and tubes manufactured from Monel 400, a high-strength and corrosion-resistant nickel-copper alloy. Known for its exceptional performance in seawater, steam, acidic, and caustic environments, Monel 400 offers excellent resistance to pitting, stress corrosion cracking, and general corrosion. Its durability and reliability make ASTM B165 UNS N04400 pipes ideal for demanding applications in marine engineering, chemical processing, oil & gas, power generation, and nuclear industries.
Key Features
- Excellent corrosion resistance in seawater & brackish environments
- High strength and toughness over a wide temperature range
- Superior resistance to hydrofluoric acid & caustic solutions
- Good weldability and formability
- Excellent thermal & electrical conductivity
- Suitable for high-temperature and high-pressure environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N04400 |
| W.Nr. | 2.4360 / 2.4361 |
| AFNOR | NU-30M |
| JIS | NW 4400 |
| BS | NA 13 |
Available Sizes
- Outside Diameter: 1/4″ to 8″ (6 mm to 219 mm)
- Wall Thickness: SCH 5S to SCH XXS
- Lengths: Up to 12 meters or custom cut
ASTM B165 UNS N04400 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 – 34.0 |
| Iron (Fe) | 2.50 max |
| Manganese (Mn) | 2.00 max |
| Carbon (C) | 0.30 max |
| Silicon (Si) | 0.50 max |
| Sulfur (S) | 0.024 max |
UNS N04400 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 517 MPa (75 ksi) min |
| Yield Strength (0.2%) | 172 MPa (25 ksi) min |
| Elongation | 40% min |
| Hardness | Rb 65 max |
Monel 400 Physical Properties
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ |
| Melting Range | 1300 – 1350°C |
| Thermal Conductivity | 21.8 W/m·K |
| Electrical Resistivity | 0.000513 ohm·cm |
| Specific Heat | 0.43 J/g·°C |
| Modulus of Elasticity | 179 GPa |
Type of UNS N04400 Pipes
- Monel 400 Seamless Pipe
- Monel 400 Seamless Tube
- Annealed Pipes
- Cold Worked Pipes
- Heat Exchanger Tubes
- Instrumentation Tubing
Applications
- Marine engineering & seawater systems
- Heat exchangers & condensers
- Chemical processing plants
- Oil & gas refining equipment
- Power generation units
- Pump & valve components
- Acid processing & alkali handling systems
- Offshore platforms and piping
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