Designation
- Grade
- C87300
- UNS
- C87300
- Standard
- ASTM B584
- Family
- Copper-based alloys
- Density
- ≈ 8.36 g/cm³
- Usual delivery condition
- As cast
Chemical composition
| Element | Mass fraction, % |
|---|---|
| Cu | ≥ 94.0 |
| Si | 3.5–4.5 |
| Mn | 0.8–1.5 |
| Zn | ≤ 0.25 |
| Fe | ≤ 0.20 |
Main elements only. Phosphorus, sulphur and residual-element limits are specified in the standard and are not reproduced here.
Mechanical properties
| Condition | Tensile strength Rm, min. (MPa) | Yield strength Rp0.2, min. (MPa) | Elongation, min. (%) |
|---|---|---|---|
| As cast | 310 | 124 | 20 |
Minimum values (or ranges) for separately cast test bars as specified in ASTM B584.
Characteristics
- Corrosion and oxidation behaviour
- Very good resistance in seawater and chloride-bearing media
- Weldability
- Good with matching filler and standard procedures
- Machinability
- Moderate; work hardening or built-up edge to be considered
- Typical applications
- Marine Valves Architectural hardware Electrical
International cross-reference
Casting and processing considerations
Aluminium bronzes form tenacious oxide films, so turbulence-free filling is essential to avoid oxide inclusions. Leaded alloys are restricted in drinking-water and some regional applications; the applicable regulations should be checked before an alloy is specified. Listed strength values originate from sand-casting specifications and are indicative for investment castings.
Reference data compiled from the cited standards for orientation. Always work from the current edition of the governing specification; values are not a guaranteed LOSTWAX delivery specification.