Bismuth Bronze is a copper alloy which typically contains 1-3% bismuth by weight. It is being marketed as a green alternative to leaded brass/bronze bearings and bushings as pressure for the substitution of hazardous metals has increased.
This alloy is very corrosion-resistant, a property which makes it suitable for use in environments such as the ocean. Bismuth Bronzees are more malleable, thermally conductive and polish better than regular brasses.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 64.00 |
| Bi | 0.50 | 4.00 |
| Sn | 0.10 | 3.00 |
| P | – | 0.20 |
| Pb | 0.01 | 0.10 |
| Fe | – | 0.70 |
| Cd | – | 0.0075 |
| Zn | Remainder |
Mechanical Properties: JIS H3250: 2015 (As Per Temper BD)
| Range (mm) | From | To | UTS Min (N/mm2) | PS Min | Elongation Min (%) | Hardness Min (HV) | Hardness Max |
| Round (Dia) | 1.5 | 75 | 315 | – | 5 | 75 | – |
| Hex (A/F) | 3 | 70 | 315 | – | 5 | 75 | – |
| Square (A/F) | 3 | 65 | 315 | – | 5 | 75 | – |
| Rectangle | 3 | 50 | 315 | – | 5 | 75 | – |
| Physical Properties |
| Melting Point – Liquidus | 1650º F |
| Solidus | 1630º F |
| Density | 0.304 lb/in3 at 68º F Specific |
| Gravity | 8.41Electrical |
| Conductivity | 26% IACS @68º F Thermal |
| Expansion | 11.8 -10 -6 per ºF (68-572º F) Modulus of Elasticity |
| Fabrication Properties |
| Machinability | Closest machinability to the traditional material with lead in all aspects including machining resistance, shape of chips and tool life etc. |
| Capability of being cold work | Good |
| Capability of being Hot work | Good |
TYPICAL USES
- Suitable for Environment Purpose of Brass with Excellent Machinability.
- Plumbing
- Computer
- Electronic Clock
- Rivet Nut Gear
- Medical Valve
- Camera Parts
- Hardware Parts
