CW708R
This high copper alloy exhibits outstanding mechanical properties and exceptional wear resistance, even when exposed to elevated temperatures. However, its decreased workability, particularly during chip removal processes, limits its applications to the production of items such as bearings, bushings, and mechanical components that endure heavy loads.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 66.00 | 70.00 |
| Pb | – | 0.80 |
| Fe | – | 0.40 |
| Ni | – | 0.50 |
| 0.70 | 1.30 | |
| Total Others | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO EN12163 CUZN31SI1 CW708R (AS PER TEMPER R460)
| Range (Inch) | From | To | UTS Min N/mm2 | PS Min (ksi) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max(HRB) |
| Round (Dia) | 5.0 | 40.0 | 460 | 240 | 18 | – | – |
| Hex (A/F) | 5.0 | 40.0 | 460 | 240 | 18 | – | – |
| Square (A/F) | 5.0 | 40.0 | 460 | 240 | 18 | – | – |
| Octagon (A/F) | 5.0 | 40.0 | 460 | 240 | 18 | – | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°C | 880-915 |
| Density Kg/cm2. at 68°F | 8.40 |
| Specific Gravity | 8.5 |
| Electrical Conductivity% IACS at 68°F | 15 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 19.4 |
| Specific Heat Capacity J/ (Kg K) | 377 |
| Modulus of Elasticity in GPa | 108 |
| FABRICATION PROPERTIES | |
| Machinability | 40% |
| Capacity of being cold worked | good |
| Capacity of being hot worked | Fair |
| Resistance welding | Good |
| Arc welding good | Good |
| Gas welding | Good |
