CW720R
Manganese is possibly the most flexible element that can be added to copper alloys. Small additions of manganese are used to deoxidize the alloy and enhance its mechanical strength and cast ability. Manganese provides a favourable combination and balance of properties like ductility, formability, strain hardening, and strength level parameters.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 57.00 | 59.00 |
| Pb | 1.00 | 2.00 |
| Al | - | 0.20 |
| Fe | - | 0.30 |
| Mn | 0.50 | 1.50 |
| Ni | - | 0.60 |
| Si | - | 0.10 |
| Sn | - | 0.30 |
| Total Others | - | 0.30 |
| Zn | Remainder | |
Mechanical Properties According To EN12164 CW720R (As Per Temper R440)
| Range (mm) | From | To | UTS Min (N/mm²) | UTS Max (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min (HB) | Hardness Max (HB) | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 6 | 50 | 440 | - | 250 | 18 | 120 | - | |
| Hex (A/F) | 5 | 40 | 440 | - | 250 | 18 | 120 | - | |
| Square (A/F) | 5 | 40 | 440 | - | 250 | 18 | 120 | - | |
| Rectangle | Thickness | 6 | 50 | 440 | - | 250 | 18 | 120 | - |
| PHYSICAL PROPERTIES | |
|---|---|
| Density | 0.303 lb/in3 |
| CTE, linear | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 1620 – 1650 ˚F |
| Solidus | 1620 ˚F |
| Liquidus | 1650˚F |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 80% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
TYPICAL USES
- Valves