C87800 is a high-silicon-manganese brass casting alloy, with a copper content of approximately 80% and strengthened by the addition of silicon and manganese elements. Compared to ordinary brass, it offers higher tensile strength and excellent wear resistance. The silicon content also imparts good anti-friction and self-lubricating properties, effectively reducing temperature rise and wear rate between mating surfaces. However, due to its low plasticity, this material is not suitable for cold working and is typically manufactured into tubes or custom-shaped components through casting processes.
Based on these characteristics, C87800 brass tubes are widely used in the production of sliding bearing bushings, worm gears, machine tool lead screw nuts, and various wear-resistant guide bushings under low-speed, heavy-load conditions. Its combination of high load-bearing capacity and low friction coefficient significantly extends the service life of mechanical assemblies, reduces maintenance frequency, and improves overall equipment reliability in industrial applications.
| Category | Parameter | Value / Range |
|---|---|---|
| General | UNS Designation | C87800 |
| ASTM Standard | ASTM B584 | |
| Material Type | High-silicon-manganese brass casting alloy | |
| Primary Form | Tube / Pipe / Hollow casting | |
| Manufacturing Process | Centrifugal casting, continuous casting, sand casting | |
| Chemical Composition (wt%) | Copper (Cu) | 79.0 – 81.0 |
| Zinc (Zn) | Remainder (approx. 13.0 – 16.0) | |
| Silicon (Si) | 3.5 – 4.5 | |
| Manganese (Mn) | 0.8 – 1.2 | |
| Lead (Pb) | ≤ 0.05 | |
| Iron (Fe) | ≤ 0.10 | |
| Tin (Sn) | ≤ 0.10 | |
| Aluminum (Al) | ≤ 0.05 | |
| Nickel (Ni) | ≤ 0.10 | |
| Antimony (Sb) | ≤ 0.05 | |
| Phosphorus (P) | ≤ 0.01 | |
| Sulfur (S) | ≤ 0.05 | |
| Other impurities (total) | ≤ 0.20 | |
| Physical Properties | Density | 8.6 g/cm³ (0.311 lb/in³) |
| Melting Point Range | 850 – 890 °C | |
| Electrical Conductivity | ~8% IACS | |
| Thermal Conductivity | ~35 W/m·K | |
| Coefficient of Thermal Expansion (20–200°C) | 18.5 × 10⁻⁶ /°C | |
| Mechanical Properties (as-cast) | Tensile Strength | 450 – 550 MPa |
| Yield Strength (0.5% extension) | 200 – 280 MPa | |
| Elongation | 10 – 18% | |
| Hardness | 140 – 190 HB | |
| Impact Strength (Charpy) | 15 – 25 J | |
| Modulus of Elasticity | 105 – 115 GPa | |
| Dimensions & Tolerances | Outside Diameter (OD) Range | 20 – 400 mm (customizable) |
| Wall Thickness Range | 3 – 80 mm (customizable) | |
| Length Range | Up to 6,000 mm (customizable) | |
| OD Tolerance | ±0.5 mm (or as agreed) | |
| Wall Thickness Tolerance | ±0.5 mm (or as agreed) | |
| Straightness | ≤ 1.0 mm/m | |
| Applicable Standards | Material Standard | ASTM B584 |
| Inspection Standard | ASTM E8 (tensile), ASTM E10 (hardness), ASTM E18 (Rockwell) | |
| Casting Quality | ASTM E165 (fluorescent penetrant inspection) | |
| Typical Applications | Sliding bearing bushings, worm gears, machine tool lead screw nuts, wear-resistant guide bushings, heavy-load low-speed mechanical components |
