C87800 is a wrought copper-silicon-zinc alloy, commonly classified as a silicon bronze, that offers an excellent combination of mechanical strength and corrosion resistance. With a silicon content typically around 3.5–4.0% and zinc additions, this alloy achieves tensile strengths comparable to mild steel while maintaining good ductility. It performs exceptionally well in marine, chemical, and industrial environments where exposure to moisture, saltwater, or mild acids is a concern.
In addition to its physical robustness, C87800 copper plate exhibits favorable fabrication characteristics. It can be readily formed, machined, and joined through soldering, brazing, or welding, making it a versatile choice for structural components, fasteners, and electrical connectors. The alloy also demonstrates good resistance to stress relaxation at elevated temperatures, ensuring reliable performance in demanding applications such as power generation, automotive parts, and architectural hardware.
| Specification Category | Details / Range |
|---|---|
| Alloy Type | Wrought copper-silicon-zinc alloy (Silicon Bronze) |
| UNS Number | C87800 |
| Standard Compliance | ASTM B96 / B96M, SAE J461, ASME SB-96 |
| Thickness Range | 0.125 in – 2.0 in (3.2 mm – 50.8 mm) |
| Width Range | 12 in – 96 in (305 mm – 2440 mm) |
| Length Range | 24 in – 240 in (610 mm – 6100 mm) |
| Temper Options | Annealed (O), Half-Hard (H02), Full-Hard (H04) |
| Tensile Strength (Typical) | 65 – 85 ksi (450 – 585 MPa) |
| Yield Strength (0.2% Offset) | 30 – 55 ksi (205 – 380 MPa) |
| Elongation (in 2 in / 50 mm) | 15% – 35% (depending on temper) |
| Hardness (Rockwell B) | 55 – 85 HRB |
| Electrical Conductivity | ~10% – 12% IACS |
| Thermal Conductivity | ~30 – 35 Btu/(hr·ft·°F) (52 – 60 W/m·K) |
| Density | 0.313 lb/in³ (8.66 g/cm³) |
| Melting Range | 1780°F – 1860°F (970°C – 1015°C) |
| Corrosion Resistance | Excellent in marine, atmospheric, and mild acidic environments |
| Fabrication Suitability | Good for forming, machining, soldering, brazing, and welding |
| Typical Applications | Pump and valve components, marine hardware, electrical connectors, fasteners, architectural trim |
