ASTM B466 C71000 Copper Nickel Alloy ( UNS C71000 )
ASTM B466 C71000 (UNS C71000) is a high-nickel copper alloy specified under ASTM B466 for seamless copper-nickel pipe and tube. Commonly known as Copper Nickel 80/20, this alloy contains approximately 80% copper and 20% nickel, delivering superior strength and excellent resistance to seawater corrosion, erosion, and biofouling compared to lower-nickel Cu-Ni grades. It is widely used in demanding marine, offshore, and heat transfer applications.
Key Features
- Excellent resistance to seawater and brackish water corrosion
- Higher strength than 90/10 copper-nickel alloys
- Superior resistance to erosion and biofouling
- Good thermal conductivity for heat exchangers
- Excellent weldability and fabrication properties
- Long service life in aggressive environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | C71000 |
| EN | CuNi20Fe |
| DIN | 2.0875 |
| ISO | CuNi20Fe |
| JIS | C7100 |
Sizes
- Outside Diameter: 6 mm to 273 mm
- Wall Thickness: 1.0 mm to 20 mm
- Length: Random, fixed, or cut-to-length
- Forms Available: Seamless pipes and tubes
ASTM B466 C71000 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 18.0 – 22.0 |
| Iron (Fe) | ≤ 2.0 |
| Manganese (Mn) | ≤ 1.0 |
| Zinc (Zn) | ≤ 0.5 |
| Others | Trace |
C71000 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 400 – 520 MPa |
| Yield Strength | 150 – 220 MPa |
| Elongation | ≥ 30 % |
| Hardness | ~100 – 130 HB |
UNS C71000 Physical Properties
| Property | Value |
|---|---|
| Density | ~8.9 g/cm³ |
| Melting Range | 1130 – 1180°C |
| Thermal Conductivity | ~40 W/m·K |
| Electrical Conductivity | ~5 % IACS |
Type of C71000 Pipe & Tubes
- Seamless Copper-Nickel Pipes
- Seamless Copper-Nickel Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Marine piping systems
- Shipbuilding
- Offshore platforms
- Seawater cooling systems
- Desalination plants
- Power Plant Condensers
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