Copper Alloy PB2 (PHOSPHOR BRONZE)
This alloy conforms to BS 1400 PB2
Chemical Composition
| % | % | % | |||
|---|---|---|---|---|---|
| Tin | 11.0-13.0 | Phosphorous | 0.15 min | Lead | 0.012-0.02 |
| Nickel | 0.5 max | Zinc | 0.3m | Copper | Remainder |
| Impurities | 0.15 max |
Mechanical Properties
| Tensile Strength (N/mm2) | 220-310 |
| Elongation (%) | 7 |
| Brinell Hardness | 69 |
| Modulus of Elasticity (lbf/m2 x 106) | 12 |
Strength at elevated temperatures
Service at elevated temperatures is limited by resistance to gradual deformation over prolonged periods of time and to oxidation. It is not suitable for sustaining loads at temperatures exceeding 300°C. The mechanical properties shown above cannot be used as an indication of performance at elevated temperatures.
Physical Properties
| Coefficient of Thermal Expansion (per °C @ 0-250°C) | 0.000018.3 |
| Thermal conductivity (W/M°C) | 45 |
| Electrical conductivity (% copper standard @ 20°C) | 9 |
| Density (g/cm3) | 8.8 |
| Freezing range (°C) approx. | 1000-831 |
Machinability
Machinability is good, being a medium hardness alloy. This material gives short turnings.
Corrosion Resistance
This alloy finds wide application where good corrosion resistance is required.
Application and General notes
General uses include unlined bearings for heavy compressive loads and shock, piston rings, axle boxes, gear wheels, centrifugal castings, and castings which require good wear resistance.
Notes for Designers of Non-Ferrous Castings
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