C5440 is a Japanese JIS-standard copper-tin-lead-zinc alloy belonging to the phosphor bronze family. It is engineered for high machinability, superior wear resistance, and excellent dimensional stability. With its unique composition, C5440 is the preferred choice for automotive, marine, and industrial engineering components that demand long service life and reliable performance.
Overview of C5440 (Leaded Phosphor Bronze)
C5440 offers an ideal combination of strength, toughness, and corrosion resistance, making it suitable for both machined parts and cast components. The addition of lead significantly improves free-cutting properties, reducing tool wear and enabling cost-effective production of high-precision parts.
Chemical Composition (Typical Range)
| Element | % Composition |
|---|---|
| Copper (Cu) | Balance |
| Tin (Sn) | 3.5 – 4.5 |
| Lead (Pb) | 3.5 – 4.5 |
| Zinc (Zn) | 3.5 – 4.5 |
| Phosphorus (P) | 0.01 – 0.4 |
| Nickel (Ni) | ≤ 0.2 |
| Iron (Fe) | ≤ 0.1 |
| Others | ≤ 0.2 |
This alloy composition provides:
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Excellent anti-friction properties
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Good wear resistance even in high-load applications
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Enhanced machinability due to lead content
Mechanical Properties (Typical Values)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 430 – 460 MPa |
| Yield Strength (Rp0.2) | 330 – 360 MPa |
| Elongation at Fracture (%) | 8 – 12 |
| Brinell Hardness (HB) | 140 – 160 |
The mechanical profile ensures that C5440 bronze can withstand dynamic loads and maintain performance under continuous service conditions.
Physical Properties
| Property | Value |
|---|---|
| Density | 8.9 g/cm³ |
| Thermal Conductivity | 58 – 65 W/m·K |
| Electrical Conductivity | ~15% IACS |
| Melting Range | 900 – 1000 °C |
These physical properties make it well-suited for electrical connectors, current-carrying components, and heat-resistant applications.
Recommended Casting & Processing Techniques
| Process | Benefit |
|---|---|
| Sand Casting | Flexible for complex shapes and prototypes |
| Centrifugal Casting | High integrity, low porosity for cylindrical parts |
| Continuous Casting | Superior surface finish, consistent dimensions |
| Permanent Mould Casting | Better accuracy and repeatability |
| Pressure Die Casting | High-volume production with fast cycle times |
Advantages of C5440 Alloy
| Advantage | Benefit |
|---|---|
| High Machinability | Faster cutting speeds, lower tool wear |
| Excellent Corrosion Resistance | Long-term durability in marine & industrial environments |
| Good Load-Bearing Capacity | Suitable for bushings, bearings, and gears |
| Electrical Conductivity | Ideal for connectors & switchgear |
| Versatile Casting Options | Adaptable to multiple manufacturing processes |
Typical Applications
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Bearings, bushings, and thrust washers
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Automotive valve seats and gear components
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Marine fittings and hydraulic parts
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Electrical connectors, switchgear contacts, and terminals
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Pump components and wear plates
Why Choose Conex Casting for C5440?
At Conex Casting, we supply JIS-standard C5440 bronze alloys that meet strict quality specifications.
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Grade-certified materials for guaranteed performance
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Custom casting & machining services available
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Fast lead times for OEM and industrial buyers
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Global shipping support to meet project timelines