ASTM B466 C71500 Copper Nickel Alloy ( UNS C71500 )
ASTM B466 C71500 (UNS C71500) is a high-performance copper-nickel alloy specified under ASTM B466 for seamless copper-nickel pipes and tubes. Commonly referred to as 70/30 Copper Nickel, this alloy contains approximately 70% copper and 30% nickel, offering superior strength and exceptional resistance to seawater corrosion, erosion, and biofouling. It is widely used in severe marine and industrial heat transfer environments.
Key Features
- Outstanding resistance to seawater and brackish water corrosion
- Superior strength compared to 90/10 and 80/20 Cu-Ni alloys
- Excellent resistance to erosion and biofouling
- Stable performance at elevated temperatures
- Excellent weldability and fabrication characteristics
- Long service life in aggressive environments
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | C71500 |
| EN | CuNi30Mn1Fe |
| DIN | 2.0882 |
| ISO | CuNi30Mn1Fe |
| JIS | C7150 |
Sizes
- Outside Diameter: 6 mm to 273 mm
- Wall Thickness: 1.0 mm to 25 mm
- Length: Random, fixed, or cut-to-size
- Forms Available: Seamless pipes and tubes
ASTM B466 C71500 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 29.0 – 33.0 |
| Iron (Fe) | ≤ 1.0 |
| Manganese (Mn) | ≤ 1.0 |
| Zinc (Zn) | ≤ 0.5 |
| Others | Trace |
C71500 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 450 – 550 MPa |
| Yield Strength | 170 – 260 MPa |
| Elongation | ≥ 30 % |
| Hardness | ~120 – 150 HB |
UNS C71500 Physical Properties
| Property | Value |
|---|---|
| Density | ~8.9 g/cm³ |
| Melting Range | 1170 – 1240°C |
| Thermal Conductivity | ~29 W/m·K |
| Electrical Conductivity | ~3 % IACS |
Types
- Seamless Copper-Nickel Pipes
- Seamless Copper-Nickel Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Seawater Cooling Systems
- Marine Piping
- Shipbuilding
- Offshore Platforms
- Desalination Plants
- Power Plant Condensers
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