What Material Is CuNi44 Copper-nickel Alloy Plate?

Unveiling the secret of 44% nickel content: CuNi44 copper-nickel alloy plate has become the hidden champion of marine engineering and petrochemical industry with its hard-core performance of 320MPa tensile strength and resistance to medium salt spray corrosion. Beware of the work hardening trap when selecting, and the 44% nickel ratio has balanced the cost and corrosion resistance. The reason behind the rise of domestic prices to US$26./KG is the leap in processing performance brought about by the breakthrough of heat treatment process.

CuNi44 copper-nickel alloy plate is a high-performance copper-based alloy. It is widely used in marine engineering, petrochemical industry, architectural decoration and other fields due to its excellent corrosion resistance, good processing performance and medium strength. This article will comprehensively analyze the CuNi44 copper-nickel alloy plate from the aspects of technical parameters, industry standards, material selection misunderstandings, technical disputes, etc.

1. Technical parameters of CuNi44 copper-nickel alloy plate

CuNi44 is a typical copper-nickel alloy, which is mainly composed of copper (Cu) and nickel (Ni), of which the nickel content is about 44%. This ratio gives CuNi44 alloy unique physical and chemical properties. The following are its main technical parameters:

Chemical composition:

Copper (Cu): balance

Nickel (Ni): 44%

Impurity elements: ≤1.5% (including iron, manganese, silicon, etc.)

Physical properties:

Density: 8.8g/cm³

Thermal conductivity: about 330W/m·K

Electrical conductivity: about 70%IACS (International Annealed Copper Standard)

Mechanical properties:

Tensile strength (σb): about 320MPa

Yield strength (σ0.2): about 180MPa

Elongation (δ5): about 40%

Corrosion resistance:

Excellent corrosion resistance in moderate salt spray environment.

Good resistance to moisture, acidic gases and organic compounds.

Processing performance:

It has good cold and hot processing performance and can be processed by stamping, stretching, bending and other forming processes.

2. Industry standards and specifications

The production and application of CuNi44 copper-nickel alloy plates must comply with relevant industry standards. The following are two commonly used industry standards:

ASTMB137: American Society for Testing and Materials standard, which specifies the chemical composition, mechanical properties and corrosion resistance requirements of copper-nickel alloy plates.

AMS4667: Aerospace material specification, suitable for the manufacture and testing of high-performance copper-nickel alloy plates.

3. Material selection misunderstandings

When selecting CuNi44 copper-nickel alloy plates, the following three misunderstandings are prone to occur:

Excessive pursuit of high nickel content: Although the increase in nickel content can improve the corrosion resistance of the alloy, excessive nickel content will lead to increased material costs and decreased processing performance. The 44% nickel content of CuNi44 has reached the best balance between performance and cost.

Ignoring the work hardening effect: CuNi44 will produce work hardening during cold working, causing the material to become hard and brittle. If this is not considered during design and processing, it may cause material deformation or performance degradation.

Ignore environmental factors: When selecting CuNi44, the corrosiveness of the use environment must be fully considered. If used in a highly corrosive environment, it may be necessary to select a higher performance alloy (such as CuNi95 or CuAl10Ni5).

IV. Technical controversy: The balance between corrosion resistance and processing performance of CuNi44

One of the technical controversy points of CuNi44 copper-nickel alloy sheet is the balance between its corrosion resistance and processing performance. On the one hand, the higher nickel content gives CuNi44 excellent corrosion resistance, making it perform well in moderately corrosive environments. On the other hand, too high a nickel content may lead to a decrease in processing performance, especially work hardening during cold working.

Some studies have shown that the problem of work hardening can be effectively alleviated by optimizing the heat treatment process (such as appropriate annealing treatment), thereby improving processing performance while maintaining corrosion resistance. The complexity and cost issues of this process still need further research and optimization.

V. Summary and Outlook

CuNi44 copper-nickel alloy sheet, as a copper-based alloy with excellent performance, is widely used in many fields. Its chemical composition, mechanical properties and corrosion resistance have reached a high level. In the process of selection and use, it is necessary to fully consider the processing performance and use environment of the material to avoid common misunderstandings.

In the future, with the advancement of technology and changes in market demand, the application field of CuNi44 copper-nickel alloy sheet will be further expanded, and its production process and performance optimization will also become the focus of research. Contact us to get the latest copper nickel price.

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