C87900 hollow copper tubing is a high-performance silicon brass alloy that delivers exceptional strength, hardness, and wear resistance, far surpassing that of pure copper. Its robust mechanical properties make it ideally suited for demanding applications involving high pressure, heavy friction, and cyclic loading. Additionally, the material exhibits outstanding corrosion resistance in challenging environments, including seawater, humid atmospheres, and various weak acidic solutions, providing reliable protection against stress corrosion cracking, rusting, and pitting over extended service life.
Thanks to its lead-alloyed composition, C87900 hollow tubing offers superior machinability, enabling smooth and efficient cutting, turning, and drilling operations with excellent chip control, which significantly reduces tool wear and production costs in high-volume precision manufacturing. These combined attributes—strength, corrosion resistance, and processability—make C87900 hollow copper tubing a preferred choice for industries such as marine engineering, automotive components, hydraulic systems, and heavy-duty mechanical equipment where both performance and reliability are critical.
| Parameter | Value / Range |
|---|---|
| Alloy Type | Silicon Brass (Leaded) |
| UNS Number | C87900 |
| Cu (Copper) | 63.0 – 67.0% |
| Si (Silicon) | 2.5 – 4.0% |
| Mn (Manganese) | 0.8 – 2.5% |
| Pb (Lead) | 0.8 – 2.0% |
| Zn (Zinc) | Remainder |
| Fe (Iron) | ≤ 0.5% |
| Al (Aluminum) | ≤ 0.15% |
| Sn (Tin) | ≤ 0.20% |
| Tensile Strength | ≥ 450 MPa (typical) |
| Yield Strength (0.2% offset) | ≥ 200 MPa (typical) |
| Elongation (in 2″) | ≥ 15% |
| Hardness (HB) | Approx. 100 – 140 |
| Density | Approx. 8.3 g/cm³ |
| Electrical Conductivity | Approx. 10 – 15% IACS |
| Thermal Conductivity | Approx. 40 – 50 W/(m·K) |
| Machinability Rating | 80% (vs. free-cutting brass = 100%) |
| Available OD Range | 6 mm – 200 mm (customizable) |
| Available Wall Thickness | 1 mm – 20 mm (customizable) |
| Standard Length | 3 m, 6 m, or as required |
| Temper Options | Extruded, drawn, or annealed |
| Applications | Marine hardware, hydraulic fittings, valve components, automotive parts, mechanical bushings |
