ASTM B111 C71520 Tube – UNS C71520 (70/30 Copper Nickel Tube)
ASTM B111 C71520 Tube, designated as UNS C71520, is a high-strength copper-nickel 70/30 alloy tube specifically engineered for severe marine and industrial service. Compared to standard C71500, ASTM B111 UNS C71520 tubes contain optimized iron and manganese levels to further enhance resistance to erosion-corrosion, cavitation, and biofouling in high-velocity seawater systems. ASTM B111 C71520 seamless tubes are widely used in condensers, heat exchangers, offshore platforms, and power generation units where long-term performance and reliability are critical.
Key Features
- Excellent resistance to seawater, polluted water, and marine atmospheres
- Higher strength than CuNi 90/10 grades
- Improved erosion and cavitation resistance
- Good thermal conductivity for efficient heat transfer
- Superior resistance to biofouling and stress corrosion cracking
- Good weldability, formability, and long service life
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | C71520 |
| EN | CuNi30Mn1Fe |
| DIN | 2.0882 |
| ISO | CuNi30Mn1Fe |
Sizes
- Outside Diameter: 6 mm to 114.3 mm
- Wall Thickness: 0.9 mm to 7 mm
- Length: Up to 6 meters, random or cut lengths
- Form: Straight tubes and U-bend tubes
ASTM B111 C71520 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 29.0 – 33.0 |
| Iron (Fe) | 0.5 – 1.0 |
| Manganese (Mn) | 0.5 – 1.0 |
| Zinc (Zn) | Max 0.5 |
| Lead (Pb) | Max 0.02 |
C71520 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 380 MPa |
| Yield Strength | ≥ 140 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 100 HRB |
UNS C71520 Physical Properties
| Property | Value |
|---|---|
| Density | 8.95 g/cm³ |
| Melting Point | ~1170°C |
| Thermal Conductivity | ~29 W/m·K |
| Electrical Conductivity | ~3% IACS |
Type of C71520 Pipe & Tubes
- C71520 Seamless Tubes
- C71520 U-Bend Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Marine Condensers,
- Offshore oil and gas platforms
- Heat Exchangers,
- Power Plants,
- Desalination units,
- Shipbuilding
- Seawater cooling systems
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