ASTM B466 C70400 Copper-Nickel Alloy ( UNS C70400 )
ASTM B466 C70400 (UNS C70400) is a copper-nickel alloy specified under ASTM B466 for seamless copper-nickel pipe and tube. Containing approximately 95% copper and 5% nickel, this alloy provides excellent resistance to seawater corrosion, biofouling, and erosion, making it a preferred material for marine, offshore, and heat exchanger applications.
Key Features
- Excellent resistance to seawater and marine corrosion
- High resistance to stress corrosion cracking
- Good thermal conductivity and heat transfer efficiency
- Strong resistance to biofouling and erosion
- Good weldability and formability
- Long service life in aggressive environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | C70400 |
| EN | CuNi5 |
| DIN | 2.0872 |
| ISO | CuNi5Fe1Mn |
| JIS | C7040 |
Sizes
- Outside Diameter (OD): 6 mm to 273 mm
- Wall Thickness: 0.8 mm to 15 mm
- Length: Random, fixed, or cut-to-length
- Form: Seamless pipes and tubes
ASTM B466 C70400 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 4.0 – 6.0 |
| Iron (Fe) | ≤ 0.5 |
| Manganese (Mn) | ≤ 0.5 |
| Others | Trace |
C70400 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 350 – 450 MPa |
| Yield Strength | 120 – 180 MPa |
| Elongation | 30 – 40 % |
| Hardness | ~90 – 110 HB |
UNS C70400 Physical Properties
| Property | Value |
|---|---|
| Density | ~8.9 g/cm³ |
| Melting Range | 1100 – 1150°C |
| Thermal Conductivity | ~50 W/m·K |
| Electrical Conductivity | ~8 % IACS |
Type of C70400 Tubes
- Seamless Copper-Nickel Pipes
- Seamless Copper-Nickel Tubes
- Heat Exchanger Tubes
- Condenser Tubes
Applications
- Marine piping and seawater systems
- Shipbuilding and offshore platforms
- Heat exchangers and condensers
- Desalination plants
- Power plants
- Oil & gas and chemical processing
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