C70600, also known as 90/10 copper-nickel alloy, consists of 90% copper and 10% nickel. This alloy is renowned for its exceptional corrosion resistance and mechanical properties, making it ideal for applications in marine engineering, chemical processing, and the oil and gas industries.
Chemical Composition
The chemical composition of C70600 alloy is as follows:
- Copper (Cu): 88.7 – 91.2%
- Nickel (Ni): 9 – 11%
- Iron (Fe): 1 – 1.8%
- Manganese (Mn): Maximum 1%
- Other elements: Present in trace amounts, typically not exceeding 0.05%
Physical Properties
The physical properties of C70600 copper-nickel alloy include:
- Density: 8.94 g/cm³
- Melting Point: 1100-1145°C
- Thermal Conductivity: 50 W/m·K
- Electrical Conductivity: 12% IACS
- Thermal Expansion Coefficient: 16.2 µm/m·°C (20-300°C)
Mechanical Properties
The mechanical properties of C70600 are as follows:
- Tensile Strength: 310 – 380 MPa
- Yield Strength: 105 – 130 MPa
- Elongation: 30 – 40%
- Hardness: 70 – 90 HRB
Superior Corrosion Resistance
C70600 copper-nickel alloy is highly regarded for its excellent corrosion resistance, particularly in marine environments. The addition of nickel enhances its ability to resist corrosion from seawater, chlorides, sulfides, and other aggressive agents. Moreover, C70600 effectively inhibits biofouling and microbial growth, which reduces maintenance costs and downtime.
Applications
Marine Engineering
C70600 copper tubes are extensively used in marine engineering for applications such as shipboard cooling systems, seawater desalination plants, heat exchangers, and condensers. Their outstanding corrosion resistance and biofouling resistance ensure long-term performance and reduced maintenance in harsh marine environments.
Chemical and Oil & Gas Industries
In the chemical processing and oil & gas industries, C70600 copper tubes are utilized for manufacturing corrosion-resistant equipment and piping systems. They are particularly suitable for handling corrosive media and operating in high-temperature and high-pressure conditions, ensuring durability and reliability.
HVAC and Refrigeration
C70600 copper tubes are also widely used in HVAC and refrigeration systems due to their good thermal conductivity and corrosion resistance. They are especially suitable for applications involving seawater or other corrosive environments.
Fabrication and Manufacturing
C70600 copper-nickel tubes offer excellent workability and can be processed through various methods such as cold rolling, cold drawing, bending, and welding. They exhibit good weldability with common techniques including Gas Tungsten Arc Welding (GTAW/TIG) and Gas Metal Arc Welding (GMAW/MIG).
Conclusion
C70600 copper-nickel alloy, with its superior corrosion resistance, mechanical properties, and thermal conductivity, is an ideal material for various industrial applications. It is widely used in marine engineering, chemical processing, oil & gas, and HVAC systems. Given the growing demand in these industries, the application prospects for C70600 copper tubes are promising.