Leaded gunmetal — bearings, bushes, valve bodies, pump parts. Good bearing + corrosion, castable.
| Property | Typical value |
|---|---|
| Density | 8800 kg/m³ |
| Yield | ~120 MPa |
| Tensile | 200–310 MPa |
| Elongation | ~13 % |
| Young's E | ~90–100 GPa (typical — published values vary) |
| Hardness | ~65–85 HB |
| CTE | ~18 µm/m·K |
| Thermal cond. | ~72 W/m·K |
| Max service | ~230 °C (bearing duty) |
| Poisson ν | ~0.34 |
| Shear modulus G | ~34–37 GPa (derived) |
| Shear strength | — |
| Specific heat | ~380 J/kg·K |
| Elec. conductivity | ~15 %IACS |
| Melting range | ~855–1010 °C |
~80%. Lead gives free chip; easy turning/boring for bushes.
Braze/solder; castings repaired by brazing.
| System | Designation |
|---|---|
| EN | CC491K [CuSn5Zn5Pb5-C] |
| DIN | G-CuSn5ZnPb / 2.1096 (Rg5) |
| ASTM | B584 C83600 |
| JIS | CAC406 (BC6) |
| BS | BS 1400 LG2 |
| UNS | C83600 |
Equivalents & alternatives: LG2 (CC491K, SAE 660 near); UNS C83600 (85-5-5-5). Alt: PB102 (higher strength wear), aluminium bronze AB2 (high load).
