CW720R
Manganese is arguably one of the most versatile elements that can be introduced into copper alloys. Even in small quantities, manganese serves several essential purposes, including deoxidizing the alloy, improving its mechanical strength, and enhancing its castability. Manganese plays a pivotal role in achieving a desirable equilibrium of properties, encompassing ductility, formability, strain hardening, as well as various strength-related characteristics.
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) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min (HB) | Hardness Max |
| 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 | Metric | English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
| FABRICATION PROPERTIES | |
| Machinability (CuZn39Pb3 = 100 %) | 80% |
| Capacity for being cold worked | Poor |
| Capacity for being hot worked | excellent |
