C38500
Architectural Bronze
Standard alloy for architectural extrusions and forgings. Combines good appearance with excellent machinability.
Tensile Strength
55–70 ksi
Yield Strength
20–55 ksi
Machinability
90 / 100
Density
0.305 lb/in³
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Copper (Cu) | 55 | 59 |
| Lead (Pb) | 2.5 | 3.5 |
| Zinc (Zn) | — | Remainder |
| Iron (Fe) | — | 0.35 |
| Aluminum (Al) | — | 0.5 |
Physical Properties
| Density | 0.305 lb/cu in |
|---|---|
| Specific Gravity | 8.45 |
| Melting Point (Solidus) | 1600°F |
| Melting Point (Liquidus) | 1650°F |
| Electrical Conductivity | 26% IACS |
Mechanical Properties
| Tensile Strength | 55–70 ksi |
|---|---|
| Yield Strength | 20–55 ksi |
| Elongation | 15–30% |
| Hardness | 50–80 Rockwell B |
| Machinability Rating | 90 |
Thermal Properties
| Thermal Conductivity | 67 Btu/ft·hr·°F |
|---|---|
| Coefficient of Expansion | 11.4 × 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
- Architectural extrusions
- Decorative hardware
- Lock bodies and keys
- Door handles and hinges
- Trim and moldings
- Store front construction
Applicable Specifications
- ASTM B455
- ASTM B124
- SAE J461
- SAE J463