Tin-phosphor bronze — bearings, bushes, springs, wear parts. Excellent wear + corrosion.
| Property | Typical value |
|---|---|
| Density | 8800 kg/m³ |
| Yield | ~150–500 MPa |
| Tensile | 340–700 MPa (temper) |
| Elongation | ~10–55 % |
| Young's E | 110 GPa |
| Hardness | ~90–200 HV |
| CTE | ~18 µm/m·K |
| Thermal cond. | ~70 W/m·K |
| Max service | ~200 °C |
| Poisson ν | ~0.34 |
| Shear modulus G | ~41 GPa (derived) |
| Shear strength | — |
| Specific heat | ~380 J/kg·K |
| Elec. conductivity | ~15 %IACS |
| Melting range | ~975–1060 °C |
~30–40% (hard tempers lower). Sharp carbide, light finishing cuts.
Braze/solder; not generally fusion-welded.
| System | Designation |
|---|---|
| EN | CW451K [CuSn5] |
| DIN | ≈CuSn6 / 2.1020 (CuSn4 / 2.1016) |
| ASTM | B139 / B103 C51000 |
| JIS | ≈C5102 (C5111) |
| BS | BS 2874 PB102 |
| UNS | C51000 |
Equivalents & alternatives: CW451K (PB102, CuSn5); UNS C51000. Alt: PB1 (CuSn11, cast, higher wear), gunmetal LG2 (bearings).
