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C21000, also known as Gilding Metal, is a 90/10 copper-zinc alloy that offers a unique balance of strength, corrosion resistance, and formability. Due to its attractive golden color and excellent workability, it is widely used in architectural, decorative, and industrial applications.
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Chemical Composition
Copper (Cu): 89.0% – 91.0%
Zinc (Zn): 9.0% – 11.0%
Lead (Pb): ≤ 0.05%
Iron (Fe): ≤ 0.05%
Other Impurities: ≤ 0.30%
Key Properties of C21000 Copper Tube
Excellent Corrosion Resistance: Performs well in various environments, including marine and industrial conditions.
Good Formability & Ductility: Can be easily drawn, bent, or formed into complex shapes.
High Electrical & Thermal Conductivity: Suitable for heat exchangers and electrical applications.
Attractive Aesthetic Appeal: The golden color makes it a preferred choice for decorative and architectural elements.
Good Strength-to-Weight Ratio: Stronger than pure copper while maintaining lightweight properties.
Excellent Weldability & Brazing Performance: Can be joined using standard welding and brazing techniques.
Applications of C21000 Copper Tube
Architecture & Interior Design: Used in decorative fittings, handrails, and ornamental components.
Heat Exchangers & Condensers: Utilized in HVAC, refrigeration, and power plant applications.
Ammunition Casing: Commonly used in bullet jackets due to its durability and malleability.
Electrical Components: Applied in electrical connectors and conductive components.
Plumbing Systems: Used in water distribution systems due to corrosion resistance.
Automotive Industry: Employed in radiator tubes and fuel lines.
Comparison with Other Copper Alloys
|
Property |
C21000 (Gilding Metal) |
C22000 (Commercial Bronze) |
C26000 (Cartridge Brass) |
|
Copper Content |
89-91% |
90% |
70% |
|
Zinc Content |
9-11% |
10% |
30% |
|
Color |
Golden |
Reddish-Gold |
Yellowish |
|
Strength |
Moderate |
Moderate-High |
High |
|
Formability |
Excellent |
Good |
Good |
|
Corrosion Resistance |
Excellent |
Good |
Moderate |
Manufacturing and Processing
C21000 copper tubes are manufactured using various techniques to enhance their properties:
Cold Drawing: Improves mechanical strength and dimensional precision.
Extrusion: Produces seamless tubes with uniform wall thickness.
Annealing: Enhances flexibility and workability for specific applications.
Welding & Brazing: Commonly used joining methods to ensure leak-proof connections.
Conclusion
C21000 copper tube is a versatile, corrosion-resistant, and aesthetically appealing alloy suitable for a wide range of industrial, decorative, and engineering applications. Its combination of strength, workability, and conductivity makes it a preferred choice for industries requiring both performance and appearance. Understanding its properties and applications ensures the best material selection for specific needs.
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