CW708R
CW708R Spec SheetHigh copper alloy. It has excellent mechanical properties and resistance to wear even at high temperatures. However, the reduced workability due to chip removal allows it to be used for the production of bearings, bushings and mechanical parts subject to high loads.
Chemical Composition
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 66.00 | 70.00 |
| Pb | – | 0.80 |
| Fe | – | 0.40 |
| Ni | – | 0.50 |
| Si | 0.70 | 1.30 |
| Total Others | – | 0.50 |
| Zn | Remainder | |
Mechanical properties according to 6912 FHTB2 (as per temper HB)
| Range (mm) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 0.5 | 40 | 460 | – | 240 | 18 | – | – |
| Hex (A/F) | 0.5 | 40 | 460 | – | 240 | 18 | – | – |
| Square (A/F) | 0.5 | 40 | 460 | – | 240 | 18 | – | – |
| Octagon (A/F) | 0.5 | 40 | 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 Conductivity BTU/sq ft/ft hr/°F at 68°F | 71 |
| Coefficient of Thermal Expansion 68–572 × 10⁻⁶ per °F (68–572°F) | 19.4 |
| Specific Heat Capacity J/(Kg K) | 377 |
| Modulus of Elasticity in GPa | 108 |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Machinability | 40% |
| Capacity of Being Cold Worked | Good |
| Capacity of Being Hot Worked | Fair |
| Resistance Welding | Good |
| Arc Welding | Good |
| Gas Welding | Good |
Typical Uses
Mechanical parts
Bearing
