We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Copper-Nickel 70/30 tubes—composed of 70% copper and 30% nickel—are known for their outstanding corrosion resistance, particularly in seawater environments. The addition of small amounts of iron (Fe) and manganese (Mn) further enhances the alloy’s strength, durability, and resistance to erosion and biofouling. These tubes are widely used in critical applications such as marine systems, desalination plants, heat exchangers, and power plant condensers, where high performance under corrosive and high-velocity conditions is essential.
Super Steel Manufacturing Co.,Ltd is professional copper nickel tubes manufacturer, for more details, please contact:sales@super-steels.com
Chemical Composition of CuNi 70/30 Tubes (Typical Values)
|
Element |
Content (% by weight) |
|
Copper (Cu) |
65.0–70.0% |
|
Nickel (Ni) |
29.0–33.0% |
|
Iron (Fe) |
0.4–1.0% |
|
Manganese (Mn) |
0.5–1.0% |
|
Zinc (Zn) |
≤1.0% |
|
Others (Pb, C, S, etc.) |
≤0.1% total |
Note: Exact composition may vary slightly depending on the manufacturing standard (e.g., ASTM B466, B111).
Mechanical Properties of CuNi 70/30 Tubes (Typical, Annealed Condition)
|
Property |
Value |
|
Tensile Strength |
320–500 MPa |
|
Yield Strength (0.2% offset) |
≥130 MPa |
|
Elongation |
≥30% |
|
Hardness (Rockwell B) |
60–75 HRB |
|
Density |
8.9 g/cm³ |
|
Melting Range |
1170–1240°C |
|
Thermal Conductivity |
~29 W/m·K (at 20°C) |
|
Electrical Conductivity |
~7% IACS |
|
Modulus of Elasticity |
~140 GPa |
Key Features of Copper-Nickel 70/30 Tubes
Superior resistance to seawater corrosion and marine biofouling
Excellent mechanical strength and stress corrosion resistance
High resistance to erosion, cavitation, and impingement attack
Good weldability and formability
Stable performance at elevated temperatures
Common Applications of Copper-Nickel 70/30 Tubes
Seawater piping and cooling systems
Shipbuilding and naval systems
Offshore platforms and oil rigs
Condenser and heat exchanger tubing
Desalination plant tubing
Power generation and petrochemical industries
English
Español
Français
بالعربية
