C90300
Tin Bronze
Lead-free tin bronze with excellent corrosion resistance and pressure tightness. Also known as '88-8-0-4' for its nominal composition of 88% copper, 8% tin, and 4% zinc.
Tensile Strength
40-45 ksi
Yield Strength
18-22 ksi
Machinability
30 / 100
Density
0.318 lb/in³
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | 86 | 89 |
| Tin (Sn) | 7.5 | 9 |
| Zinc (Zn) | 3 | 5 |
| Lead (Pb) | — | 0.3 |
| Nickel (Ni) | — | 1 |
| Iron (Fe) | — | 0.2 |
Physical Properties
| Density | 0.318 lb/cu in |
|---|---|
| Specific Gravity | 8.8 |
| Melting Point (Solidus) | 1570°F |
| Melting Point (Liquidus) | 1832°F |
| Electrical Conductivity | 12% IACS |
Mechanical Properties
| Tensile Strength | 40-45 ksi |
|---|---|
| Yield Strength | 18-22 ksi |
| Elongation | 18-30% |
| Hardness | 65-75 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 and bodies
- Valve bodies and components
- Bearings and bushings
- Gears
- Piston rings
- Steam fittings
- Pressure-tight castings
Applicable Specifications
- ASTM B584
- ASTM B505
- ASTM B271
- SAE J461
- SAE J462
Frequently Asked Questions
Technical details about C90300 composition, properties, and applications.