ASTM B111 C71000 Tube – UNS C71000 (Copper Nickel 90/10 Tube)
ASTM B111 C71000 Tube, identified by UNS C71000, is a copper-nickel alloy tube developed for demanding heat transfer and marine service applications. Belonging to the copper-nickel family, ASTM B111 UNS C71000 tubes provide a reliable balance of corrosion resistance, mechanical strength, and thermal efficiency. These tubes are manufactured seamlessly under ASTM B111 standards and are widely used in condensers, heat exchangers, and seawater handling systems where resistance to corrosion and long service life are critical.
ASTM B111 C71000 tubes are particularly valued for their stability in seawater environments and their ability to withstand continuous exposure to harsh operating conditions with minimal maintenance.
Key Features
- Good resistance to seawater and marine atmospheric corrosion
- Reliable thermal conductivity for heat transfer applications
- Seamless construction for uniform strength and performance
- Good ductility and formability
- Resistance to biofouling and erosion in seawater systems
- Long operational life and reduced maintenance costs
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | C71000 |
| EN | CuNi Alloy |
| DIN | 2.0870 |
| ISO | Copper Nickel Alloy |
Sizes
- Outside Diameter: 6 mm to 114.3 mm
- Wall Thickness: 0.7 mm to 6 mm
- Length: Up to 6 meters, random and cut lengths available
- Form: Straight lengths and U-bend tubes
ASTM B111 C71000 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | Balance |
| Nickel (Ni) | 9.0 – 11.0 |
| Iron (Fe) | Max 1.0 |
| Manganese (Mn) | Max 1.0 |
| Zinc (Zn) | Max 0.5 |
| Lead (Pb) | Max 0.02 |
C71000 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 340 MPa |
| Yield Strength | ≥ 120 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 85 HRB |
UNS C71000 Physical Properties
| Property | Value |
|---|---|
| Density | 8.94 g/cm³ |
| Melting Point | ~1100°C |
| Thermal Conductivity | ~45 W/m·K |
| Electrical Conductivity | ~4% IACS |
Type of C71000 Pipe & Tubes
- C71000 Seamless Tubes
- C71000 U-Bend Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Marine condensers,
- Heat exchangers,
- Shipbuilding,
- Offshore structures,
- Desalination plants,
- Power generation units
- Seawater cooling systems
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