What is the difference between 90 10 and 70 30 copper-nickel?

In the field of metal materials, copper-nickel alloys are widely used in many industries due to their unique performance advantages. Copper nickel 70 30 (CuNi70-30) and copper nickel 90 10 (CuNi90-10) are two typical copper-nickel alloys, which have obvious differences in composition, performance, and application. These materials, often supplied by copper nickel manufacturers and copper nickel suppliers, are available in various forms such as copper nickel bar and copper nickel round bar, making them suitable for diverse industrial needs.

Chemical composition

• CuNi70-30
  Copper nickel 70 30 alloy contains 70% copper and 30% nickel, a fixed composition ratio that gives it specific physical and chemical properties. This higher nickel content influences its mechanical and corrosion-resistant characteristics.
• CuNi90-10
  Copper nickel 90 10 alloy is mainly composed of 90% copper and 10% nickel, with trace elements like iron, manganese, silicon, lead, sulfur, carbon, and phosphorus to meet specific performance requirements. The lower nickel content here enhances its conductivity and processability.

Physical properties

• Density and melting point
  The density of copper nickel 90 10 alloy is about 8.81g/cm³, with a high melting point range of 1300°C to 1350°C. Copper nickel 70 30 alloys, with higher nickel content, likely have a relatively higher density and different melting points, though specific data may vary by manufacturer.
• Thermal conductivity and resistivity
  Copper nickel 90 10 exhibits good thermal conductivity (79W/(m·K)) and low resistivity (0.011Ω·mm²/m) at room temperature. In contrast, the electrical conductivity of copper nickel 70 30 tubes is 7.6×10⁷/(Ω·m). The higher copper content in CuNi90-10 theoretically gives it better thermal and electrical conductivity.
• Thermal expansion coefficient
  The thermal expansion coefficient of copper nickel 70 30 tubes is 13.1×10⁻⁶/K. While data for copper nickel 90 10 is limited, different compositions in copper-nickel materials typically lead to varying expansion coefficients, affecting their use in different temperature environments.

Mechanical properties

• Strength and hardness
  Copper nickel 90 10 has a tensile strength of 480–620MPa, Brinell hardness (HB) ≤120, and elongation of 30–50%. Copper nickel 70 30, with higher nickel content, may have higher strength and hardness but lower elongation.
• Wear resistance and fatigue resistance
  Copper nickel 90 10 pipe fittings excel in wear and fatigue resistance, suitable for complex environments. Copper nickel 70 30 may differ in these properties, requiring evaluation based on specific usage scenarios.

Corrosion resistance

• Uniform corrosion
  Both alloys offer excellent resistance to uniform corrosion, with copper nickel 90 10 particularly effective in chlorinated seawater. Copper nickel 70 30 also performs well, but differences in media resistance may arise due to composition.
• Localized corrosion
  Copper nickel 90 10 resists pitting and crevice corrosion, while copper nickel 70 30 shows promise but requires further testing for specific resistance data.
• Erosion resistance
  Copper nickel 90 10 outperforms many copper alloys and steels in erosion resistance. Copper nickel 70 30 may also be robust, but comparative research is needed to clarify differences.

Processing performance

• Forming method
  Both copper nickel material types can be processed via conventional methods. Copper nickel 90 10 is suitable for forging, stamping, and welding, with easy cutting and bending. Copper nickel 70 30 likely shares processing viability, though parameters may differ.
• Heat treatment
  Copper nickel 90 10 can be solution-treated or age-hardened to improve properties. Copper nickel 70 30 may use similar methods, but process specifics vary by composition.

Application fields

• CuNi70-30
  Due to its strength, hardness, and corrosion resistance, copper nickel 70 30 is suited for high-end marine engineering equipment, special chemical pipelines, and other demanding applications.
• CuNi90-10
  Copper nickel 90 10 pipe fittings and materials are widely used in:
  • Marine engineering: Ship pipelines, equipment, and parts.
  • Electrical/electronic industries: Conductive materials.
  • Construction/decoration: After polishing/electroplating.
  • Other sectors: Seawater desalination, chemical equipment, deep-sea oil/gas extraction, nuclear power, and aircraft manufacturing.

Price considerations

When evaluating these alloys, factors like copper nickel 90 10 price, copper nickel price per kg, or copper nickel price per pound vary by supplier, material form (e.g., bar, round bar), and order volume. Manufacturers and suppliers typically provide quotes based on current market rates and product specifications.

Copper nickel 70 30 and copper nickel 90 10 each offer distinct advantages in composition, performance, and application. Selecting the right copper nickel material requires balancing use requirements, environmental factors, and cost—with guidance from reliable manufacturers and suppliers to ensure optimal performance.

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