Products Description
Product Specifications
| Standards | ASTM B111 / ASME SB111 |
| Steel Grades | C71500 ,or C10100 C10200 C10300 C10800 C12000 C12200 C14200 C19200 C23000 C28000 C44300 C44400 C44500 C60800 C61300 C61400 C68700 C70400 C70600 C70620 C71000 C71520 C71640 C72200 |
| Equivalent Standards | UNS C71500, BS 2871 CN107, EN CuNi30Mn1Fe |
| Outer Diameter (OD) | 3 mm – 120 mm |
| Wall Thickness (WT) | 0.5 mm – 20 mm |
| Length | Up to 12m, customized |
| Surface Treatment | Bright annealed |
| Production Process | Cold Drawing / Cold Rolling |
| Condition | Annealed (soft) |
C71500 copper-nickel alloy is composed of 70% copper and 30% nickel, with minor additions of elements such as iron and manganese. Consequently, it exhibits exceptional resistance to seawater corrosion and possesses moderate electrical conductivity-approximately 10–15% that of standard copper.
ASTM B111 C71500 copper nickel alloy tubes demonstrate outstanding corrosion resistance; compared to other metallic materials-such as aluminum and carbon steel-C71500 undergoes virtually no corrosion, even after prolonged exposure to seawater.
Customized Services
- TORICH offers precision cut-to-length services, cutting materials to the exact lengths specified by the customer with a length tolerance controlled within ±3 mm.
- Tube ends can be finished as plain ends, 30° bevels, or 37.5° welding bevels; we also support secondary processing services such as flaring, swaging, bending, and U-bending.
- We provide customized heat treatment services, offering options for stress relieving or full annealing.
Chemical Composition
| Element | Copper (Cu) | Nickel (Ni) | Iron (Fe) | Manganese (Mn) | Lead (Pb) | Zinc (Zn) | Others |
| Composition (%) | 70.0-73.0 | 24.0-26.0 | 1.0 max | 1.0 max | 0.05 max | 1.0 max | 0.5 max |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness (HV) |
| Value | 520 MPa (min) | 205 MPa (min) | 30% (min) | 140 (min) |
Physical Properties
| Property | Density | Melting Pointgle | Thermal Conductivity | Electrical Conductivity |
| Value | 0.323 lb/in^3 | 2260°F | 32 Btu/ft/hr/°F | 5.5% IACS at 68°F |
Possible Alternative Grades
While ASTM B111 C71500 offers excellent corrosion resistance and mechanical properties, there are alternative grades available for specific applications. Some alternatives include:
- ASTM B111 C70600 (90/10 copper-nickel alloy) for applications requiring higher thermal conductivity
- ASTM B111 C70620 (90/10 copper-nickel alloy with reduced iron content) for improved corrosion resistance
- ASTM B111 C68700 (Aluminum Brass) for applications requiring enhanced resistance to biofouling and erosion
Application areas
ASTM B111 C71500 copper-nickel alloy tubes are widely utilized in the following fields involving seawater heat exchangers and condensers:
- Power Industry: Seawater condensers for steam turbines at coastal thermal and nuclear power plants; circulating water heat exchangers; condenser tube bundles.
- Marine & Shipbuilding Industry: Central seawater cooling systems for ocean-going cargo vessels, cruise ships, and offshore drilling platforms; onboard condensers.
- Seawater Desalination Industry: Pre-treatment seawater heat exchangers for reverse osmosis systems; condenser tubing for evaporative desalination units.
- Marine Renewable Energy: Cooling systems for offshore wind turbine towers; seawater heat exchange equipment for offshore photovoltaic power stations.
- Chemical Industry: Seawater cooling units for coastal chemical plants; heat-exchange piping for salt-based chemical processes.
- HVAC & Refrigeration: Seawater-source heat pump exchangers for large-scale commercial central air conditioning systems in coastal regions.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
TORICH offers a wide range of packaging options, including plastic end caps, woven bags, wooden crates, and iron frames. Custom packaging solutions, logo branding, and other personalized requirements are also available to meet specific customer needs.
FAQ
Q: At what seawater flow velocities can C71500 tubing be utilized?
A: C71500 can withstand seawater flow velocities of up to 3–4 m/s without experiencing severe erosion corrosion.
Q: What is the primary difference between C71500 and C70600 copper-nickel tubing?
A: The core difference lies in their nickel content and resistance to erosion. C71500 contains 30% nickel, making it suitable for seawater condensers operating at high flow velocities; C70600 contains 10% nickel, making it suitable for heat exchangers operating at lower flow velocities. C71500 is the preferred choice for heavy-duty applications involving high pressure and high flow rates, whereas C70600 is selected for milder operating conditions to achieve cost savings.
Q: Is an anti-corrosion coating required?
A: When exposed to seawater, the surface of C71500 alloy tubing spontaneously forms a dense, stable nickel oxide passivation film, thereby providing inherent, long-lasting corrosion resistance. Furthermore, the gradual release of copper ions inhibits biofouling; consequently, applying an additional coating would reduce heat-transfer efficiency.
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