C64200 Aluminum Bronze

UNS C64200 is a silicon aluminum bronze, classified as a wrought (deformation‑processed) copper alloy. By adding silicon (Si) to the aluminum bronze system, this alloy significantly improves machinability and anti‑galling (anti‑seizing) properties, while maintaining excellent corrosion resistance.

 

Aluminum Bronze C64200 is a high‑quality copper alloy composed primarily of copper, aluminum, and a minor addition of manganese. It offers excellent corrosion resistance, good oxidation resistance, and outstanding mechanical properties. This material is widely employed in the manufacture of high‑strength and wear‑resistant components. Compared with traditional bronzes, the advanced C64200 aluminum bronze provides a lighter weight and enhanced overall performance.

 

In addition, C64200 exhibits superior weldability and machinability relative to many other copper alloys, which greatly facilitates fabrication and streamlines production operations for manufacturers.

 

 

 

American standard: UNS C64200 (ASTM B150/B249/B283, AMS 4631/4634)
European standard: CuAl7Si2 (CW301G, EN 12163)
National standard: approximate QAl7Si2 (GB/T 5231)
Alternative names: CDA 642, Silicon Aluminum Bronze, Free Cutting Aluminum Bronze

 

 

Aluminum Bronze C64200 has a robust and well‑balanced chemical composition, consisting primarily of:

• Copper (Cu): accounts for 67% – 90% of the alloy and serves as the base element.
• Aluminum (Al): typically present at 8% – 11%, which imparts excellent strength and corrosion resistance.
• Manganese (Mn): generally in the range of 0.5% – 1%, which enhances wear resistance.

This carefully formulated composition gives C64200 superior durability and strength, making it well suited for demanding applications under extreme service conditions.

 

 

Aluminum Bronze C64200 exhibits the following physical characteristics:

• Density: approximately 8.7 g/cm³, which makes it suitable for lightweight design considerations.
• Melting range: typically between 950 °C and 1050 °C, accommodating a wide variety of processing and forming requirements.
• Electrical conductivity: although lower than that of pure copper, it still offers good conductivity performance, making it viable for various electrical applications.

In terms of mechanical properties, C64200 demonstrates outstanding performance:

• Tensile strength: generally in the range of 570 – 720 MPa, enabling the alloy to withstand substantial loads.
• Yield strength: ranging from 310 to 460 MPa, indicating that the material resists significant deformation under high‑pressure conditions.
• Ductility: the alloy possesses good ductility, which facilitates forming into complex shapes and intricate components.

 

 

Aluminum Bronze C64200 exhibits excellent processing versatility, offering the following advantages:

Good machinability: The alloy can be readily processed using conventional mechanical machining and forming techniques, including milling, turning, and other standard operations. One of the distinguishing features of C64200 is its favorable machinability, which allows for efficient fabrication with common machine tools.

Good weldability: It is compatible with a variety of welding processes, including arc welding, TIG (tungsten inert gas) welding, and other suitable methods. While C64200 may not be as readily weldable as some other copper alloys, sound and reliable welds can be achieved when appropriate techniques and procedures are employed.

Heat treatment: The alloy generally does not require heat treatment to attain its baseline mechanical properties. However, when specific application demands call for enhanced performance, carefully controlled heat treatment can be applied to further improve its mechanical strength and increase its wear resistance.

 

 

C64200 aluminum bronze is a high-performance copper alloy that combines high strength, wear resistance, and corrosion resistance, suitable for harsh industrial environments. By appropriate processing and heat treatment, its performance can be further optimized to meet diverse engineering needs.

• Excellent machinability: C64200 aluminum bronze is particularly valued for its rare and superior machinability among aluminium bronzes. It can be readily processed using conventional mechanical machining methods, making it highly efficient for production.
• High strength and hardness: The addition of aluminium significantly enhances the alloy's strength and hardness, making it suitable for applications that endure heavy loads and high stress.
• Good corrosion resistance: This alloy exhibits strong corrosion resistance in a wide range of environments, with particularly outstanding performance in marine and seawater conditions.
• Fair electrical conductivity: Although the aluminium content slightly reduces the electrical conductivity compared to pure copper, C64200 still retains a useful level of conductivity, making it suitable for certain electrical and electronic applications.

 

 

Aluminum Bronze C64200 offers excellent processing flexibility and can be manufactured using a variety of methods, including both cold working and hot working. Whether in casting, extrusion, or forging processes, C64200 demonstrates outstanding adaptability and formability.

• In terms of welding, C64200 also performs exceptionally well. With the appropriate welding procedures, sound joint quality can be achieved reliably. Moreover, its relatively low coefficient of thermal expansion contributes to improved dimensional stability and performance retention at elevated temperatures.
• From an application perspective, C64200 not only delivers high strength and good wear resistance but also exhibits favorable electrical conductivity, securing its place in electrical engineering and equipment applications. Its excellent oxidation resistance further ensures long‑term service reliability, particularly in high‑humidity and marine environments.

 

 

C64200 aluminum bronze alloy finds extensive applications across a broad range of industries, including:

• Aerospace: Used in the manufacture of aerospace components that demand high strength and excellent corrosion resistance.
• Marine Engineering: Employed in marine fittings, offshore platform structural parts, and other components that are in direct contact with seawater.
• Electrical Sector: Suitable for electrical connectors and other electrical components, thanks to its good electrical conductivity and corrosion resistance.
• General Engineering: Utilized in high‑performance shafts, bolts, nuts, valves, and other parts, leveraging its excellent machinability and high strength.

 

 

Q1: What is UNS C64200 Silicon Aluminum Bronze?

A: UNS C64200 is a wrought silicon aluminum bronze. By adding silicon to the aluminum bronze system, it significantly improves machinability and anti‑galling properties while maintaining excellent corrosion resistance. It is often described as an engineering alloy that combines the conductivity and corrosion resistance of copper with the mechanical toughness of steel.

 

Q2: Is C64200 a casting alloy or a wrought alloy?

A: C64200 is a wrought (deformation‑processed) alloy. It is typically supplied as semi‑finished products such as round, hexagonal, and octagonal rods, suitable for hot forging and machining.

 

Q3: How machinable is C64200?

A: Excellent. C64200 has a machinability rating of 60% (with UNS C36000 free‑cutting brass as 100% baseline), which gives it the highest machinability of all bronzes and brasses. The silicon addition significantly improves machining, making it a free‑machining alloy suitable for fast production of complex components.

 

Q4: How does C64200 perform at elevated temperatures?

A: C64200 offers good stability at elevated temperatures with a low coefficient of thermal expansion, making it suitable for environments with temperature fluctuations. For prolonged exposure to extreme temperatures, consult the material supplier for specific service temperature limits.

 

Q5: Is C64200 magnetic?

A: C64200 has low magnetic permeability and is considered non‑magnetic or weakly magnetic for most engineering applications. It is suitable for use in magnetic‑sensitive equipment such as sonar, compasses, and mine hunters.

 

Q6: What is the difference between C64200 and ordinary aluminum bronze (e.g., C62400)?

A: The main differences are: C64200 contains 1.5–2.2% silicon and has a machinability rating of 60% – the highest among all bronzes.

C62400 contains no silicon and has a machinability rating of only 20–50%, making it much more difficult to machine.

If your application requires extensive machining (e.g., valve stems, fasteners), C64200 is the better choice. If only high strength and wear resistance are needed with minimal machining, C62400 may be more suitable.

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