Main characteristics and application scenarios of C70600 tube sheet
C70600 is a commonly used copper-nickel alloy, often referred to as 90/10 copper-nickel alloy because it is mainly composed of approximately 90% copper and 10% nickel, with small amounts of iron and manganese to improve its corrosion resistance. As a tube sheet material, it plays an important role in various industrial applications.
1.Chemical composition
- Copper (Cu): about 88.5% - 91.5%
- Nickel (Ni): 9.0% - 11.0%
- Iron (Fe): 1.0% - 1.8%
- Manganese (Mn): 1.0% (maximum)
- Other impurities: very small amounts
2.Key Features
①Corrosion resistance
- It has strong resistance to strong corrosive media such as seawater, acid and alkali, and its service life far exceeds that of ordinary metal materials (such as stainless steel).
- In the marine environment, it has significant resistance to marine biological attachment, reducing maintenance costs caused by biological corrosion.
②Excellent mechanical properties
- High strength (tensile strength ≥ 380 MPa) and good ductility, can withstand mechanical stress under complex working conditions.
- Low temperature resistance (-196℃) and high temperature resistance (400℃) performance, adapt to extreme temperature environments.
③Processing and welding performance
- Easy to process into complex shapes through smelting, casting, extrusion and other processes to meet customized needs.
- Good welding performance and high weld strength, suitable for large-scale industrial production.
④Versatility
- It has both electrical conductivity and thermal conductivity, suitable for power and heat exchange systems.
- Low hydrogen embrittlement sensitivity, avoids material embrittlement caused by hydrogen penetration, and improves safety.
⑤Environmental protection and economy
- Long life reduces replacement frequency and reduces resource consumption.
- In the shipbuilding and chemical industries, its high cost-effectiveness can replace precious metals (such as titanium alloys) and reduce initial investment costs.
3.Application Scenario
Marine and offshore engineering: used in the manufacture of ship condensers, heat exchangers, seawater cooling systems and related equipment on offshore platforms.
Desalination plants: as a key component of heat exchangers in processes such as multi-stage flash (MSF) and multiple effect distillation (MED).
Coastal power plants: used in condenser tube sheets for power plants using seawater cooling.
Certain chemical and petrochemical applications: where corrosive salt water or other specific chemical media need to be handled.
4.Other applications
In addition to tube sheets, copper-nickel alloys are also widely used in other key components of heat exchangers due to their excellent corrosion resistance, good thermal conductivity and weldability.
①Heat Exchanger Tubes:
This is one of the most important applications of copper-nickel alloy in heat exchangers. Since heat exchange with fluids needs to be carried out directly and corrosive media (such as seawater and salt water) are often encountered, copper-nickel alloys (such as C70600 and the stronger C71500, i.e. 70/30 copper-nickel alloy) are ideal materials for manufacturing heat exchanger tubes.
Advantages: Excellent resistance to various types of corrosion, good thermal conductivity, easy to manufacture and connect.
C70600 Tube
② End Covers / Water Boxes:
The end covers are the parts that close the ends of the heat exchanger tube bundle and guide the fluid in and out of the heat exchanger tube. In order to ensure long-term reliable operation, the end cover part that contacts the cooling medium (especially seawater) is usually made of copper-nickel alloy.
Advantages: Excellent resistance to seawater corrosion, able to withstand fluid pressure, and good connection with copper-nickel tubes.
③ Flanges:
Flanges are used to connect different parts of the heat exchanger (such as tube bundles and end covers) and to connect external piping systems. Where high corrosion resistance is required, especially when connecting to copper-nickel tubes and end caps, flanges may also be made of copper-nickel alloy to ensure consistent corrosion resistance throughout the system.
Advantages: Good corrosion resistance and can provide a reliable sealing connection.