C87800 is a high-performance wrought copper alloy renowned for its exceptional combination of mechanical strength and corrosion resistance. Its carefully balanced composition delivers superior tensile properties, enabling it to withstand significant stress and wear in demanding industrial environments. This makes it an ideal material choice for heavy-duty components such as valve stems, pump shafts, marine hardware, and precision-engineered fittings, where both reliability and longevity are critical.
In addition to its robust physical properties, C87800 copper bar offers excellent machinability, allowing for efficient manufacturing with tight dimensional tolerances and smooth surface finishes. It also maintains good electrical and thermal conductivity, broadening its applicability across various sectors, including automotive, aerospace, and chemical processing. Overall, C87800 strikes a versatile balance between performance, workability, and durability, making it a preferred material for engineers seeking a dependable copper alloy solution.
| Category | Details |
|---|---|
| General Description | High-strength wrought silicon bronze alloy with excellent corrosion resistance, good machinability, and high durability; widely used in marine, automotive, aerospace, and precision engineering applications. |
| UNS Designation | C87800 |
| Chemical Composition | Copper (Cu): 79.0 – 82.0% Silicon (Si): 3.5 – 4.3% Zinc (Zn): Remainder Lead (Pb): ≤ 0.09% Iron (Fe): ≤ 0.15% Manganese (Mn): ≤ 0.10% Tin (Sn): ≤ 0.10% Aluminum (Al): ≤ 0.05% Nickel (Ni): ≤ 0.10% Other impurities (total): ≤ 0.20% |
| Density | 8.53 g/cm³ (0.308 lb/in³) |
| Melting Point Range | 970 – 1010 °C (1780 – 1850 °F) |
| Electrical Conductivity | ~15 – 18% IACS |
| Thermal Conductivity | ~45 W/m·K (at 20°C) |
| Coefficient of Thermal Expansion | 18.5 × 10⁻⁶ /°C (20–300°C) |
| Tensile Strength (Ultimate) | 550 – 620 MPa (80 – 90 ksi) |
| Yield Strength (0.2% offset) | 310 – 380 MPa (45 – 55 ksi) |
| Elongation (in 50 mm / 2 in) | 15 – 20% |
| Hardness (Brinell, HB) | 140 – 180 |
| Modulus of Elasticity | 110 GPa (16,000 ksi) |
| Machinability Rating | 60% (compared to C36000 free-cutting brass = 100%) |
| Available Forms | Round bars, square bars, hex bars, flat bars, and custom profiles |
| Diameter Range (Round Bars) | 6 mm – 300 mm (0.25 in – 12 in) |
| Length Range | 1,000 mm – 6,000 mm (3 ft – 20 ft), or custom lengths |
| Temper Conditions | As-extruded, cold-drawn, annealed, or heat-treated as required |
| Surface Finish | Bright, smooth, or oxide-free; optional pickled or polished |
| Corrosion Resistance | Excellent resistance to seawater, industrial atmospheres, and many chemicals; resistant to stress-corrosion cracking |
| Typical Applications | Valve stems, pump shafts, marine propellers, bearings, gears, electrical connectors, fasteners, and precision-machined components |
| Standards Compliance | ASTM B98, ASTM B124, SAE J463, UNS C87800 |
