ASTM B725 Monel 400 (UNS N04400) Welded Pipe
ASTM B725 Monel 400 (UNS N04400) welded pipe is a premium nickel-copper alloy known for its outstanding corrosion resistance, especially in seawater and rapidly flowing brine. The alloy offers high strength, excellent toughness, and superior resistance to acids, alkalis, and chloride stress-corrosion cracking. Manufactured under ASTM B725 standards, Monel 400 welded pipes are widely used in marine engineering, chemical processing, offshore operations, and equipment handling corrosive fluids. Its durability, weldability, and capability to perform in sub-zero to high temperatures make it ideal for demanding industrial applications.
Key Features
- Exceptional corrosion resistance in seawater and chloride environments
- High strength and toughness across a wide temperature range
- Excellent resistance to acids, alkalis, and saline media
- Superior performance in marine and offshore conditions
- Good weldability and formability
- Suitable for high-pressure and high-temperature process systems
- Ideal for brine, crude oil, petrochemical, and marine handling equipment
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N04400 |
| WNR | 2.4360 / 2.4361 |
| BS | NA13 |
| JIS | NW4400 |
| Trade Name | Monel 400 |
Sizes
Outer Diameter (OD)
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From 6 mm (1/4″ NB) up to 914.4 mm (30″ NPS)
Wall Thickness (WT)
-
Available in 5S, 10S, 40S, 80S, 160, XXS and other schedules
-
Thickness range from 0.3 mm to 50 mm or more, depending on OD and schedule
Length Options
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Supplied in Single Random (SRL), Double Random (DRL)
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Custom lengths up to 13,500 mm (approx. 44 feet) available on request
ASTM B725 Monel 400 (UNS N04400) Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 – 34.0 |
| Iron (Fe) | ≤ 2.5 |
| Manganese (Mn) | ≤ 2.0 |
| Carbon (C) | ≤ 0.30 |
| Silicon (Si) | ≤ 0.50 |
| Sulfur (S) | ≤ 0.024 |
Monel 400 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength (0.2% Offset) | ≥ 170 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 80 HRB |
UNS N04400 Physical Properties
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ |
| Melting Point | 1300 – 1350°C |
| Electrical Resistivity | 0.054 μΩ·m |
| Thermal Conductivity | 21.8 W/m·K |
| Modulus of Elasticity | 179 GPa |
Types ASTM B725 Monel 400 (UNS N04400) Pipes
- ASTM B725 Monel 400 Welded Pipes
- Welded & Annealed Monel 400 Pipes
- Large Diameter Welded Pipes
- Custom Fabricated Monel 400 Pipes
Applications
- Marine and offshore piping systems
- Seawater desalination equipment
- Chemical processing and acid-handling systems
- Oil & gas refinery piping
- Heat exchangers and condensers
- Pump shafts and seawater service lines
- Petrochemical and brine transport pipelines
- Food processing and alkali handling systems
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