C90500
Tin Bronze (Gun Metal)
Lead-free, good strength and corrosion resistance. Traditional 'gun metal' composition with excellent casting properties.
Tensile Strength
40–45 ksi
Yield Strength
18–22 ksi
Machinability
30 / 100
Density
0.312 lb/in³
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | 86 | 89 |
| Tin (Sn) | 9 | 11 |
| Zinc (Zn) | 1 | 3 |
| Lead (Pb) | — | 0.3 |
| Nickel (Ni) | — | 1 |
Physical Properties
| Density | 0.312 lb/cu in |
|---|---|
| Specific Gravity | 8.63 |
| Melting Point (Solidus) | 1570°F |
| Melting Point (Liquidus) | 1830°F |
| Electrical Conductivity | 11% IACS |
Mechanical Properties
| Tensile Strength | 40–45 ksi |
|---|---|
| Yield Strength | 18–22 ksi |
| Elongation | 20–25% |
| Hardness | 70–80 BHN |
| Machinability Rating | 30 |
Thermal Properties
| Thermal Conductivity | 43 Btu/ft·hr·°F |
|---|---|
| Coefficient of Expansion | 10 × 10⁻⁶ /°F |
| Specific Heat | 0.09 Btu/lb·°F |
Fabrication Properties
Soldering
Brazing
Oxyacetylene Welding
Gas Shielded Arc
Coated Metal Arc
Cold Working
Hot Forming
Typical Applications
- Pump impellers
- Valve bodies
- Gears
- Bearings for light loads
- Piston rings
- Steam fittings
Applicable Specifications
- ASTM B584
- ASTM B505
- ASTM B271
- SAE J461
- SAE J462
Frequently Asked Questions
Technical details about C90500 composition, properties, and applications.