70/30 Copper Nickel

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:

  1. 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.

  2. 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.

  3. 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.

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