70/30 COPPER NICKEL
Cupro Nickel 70/30, also known as Copper-Nickel 70/30, is a highly reliable alloy used for condenser tubes due to its excellent properties.
Composition
- Copper (Cu):70%
- Nickel (Ni):30%
- Iron (Fe):Typically around 0.4-1.0%
- Manganese (Mn): Small amounts, usually around 0.5-1.0%
- Trace amounts of other elements to enhance specific properties.
GRADES
ASTM B 111 C 71500 / ASME SB 111 C 71500:
- Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock.
- C71500 Designation for Copper-Nickel 70/30 in these standards.
BS 2871 Part 3 CN 107:
- Specification for copper and copper alloy tubes suitable for refrigeration and air conditioning.
- CN 107: British Standard designation for Copper-Nickel 70/30.
EN 12451 CuNi 30 Fe 1 Mn - CW 354H, CW 353H:
- European standard for copper and copper alloys – Seamless, round tubes for heat exchangers.
- CW 354H / CW 353H: European designations for Copper-Nickel 70/30.
NFA 51 102 CuNi 30 Fe 1 Mn:
- French standard for copper and copper alloys.
- CuNi 30 Fe 1 Mn: French designation for Copper-Nickel 70/30.
JIS H 3300 C 7150:
- Japanese Industrial Standard for copper and copper alloy seamless tubes.
- C7150: Japanese designation for Copper-Nickel 70/30.
Properties:
- Corrosion Resistance:
- Exceptional resistance to seawater corrosion, making it ideal for marine applications.
- Resistance to stress corrosion cracking and erosion.
- Superior resistance to biofouling compared to other copper alloys.
- Mechanical Properties:
- Tensile Strength: Good tensile strength, suitable for various industrial applications.
- Yield Strength: Adequate yield strength, providing durability.
- Hardness: Moderate hardness, offering wear resistance.
- Thermal Conductivity:
- High thermal conductivity, enabling efficient heat transfer, though lower than pure copper.
Applications:
- Marine Industry: Widely used in shipbuilding for seawater systems, heat exchangers, and condensers due to its resistance to seawater corrosion.
- Power Plants: Utilized in power plants for condensers and heat exchangers where seawater is used for cooling.
- Desalination Plants: Essential in desalination plants for evaporators and heat exchangers due to its resistance to saline environments.
- Chemical Industry: Used in applications involving corrosive chemicals and requiring high thermal conductivity.
