CW706R
CW706R is a dezincification-resistant brass known for its excellent cold working properties and a pure α-structure. This alloy is ideally suited for use in applications where exposure to warm, acidic waters is common. Furthermore, CW706R exhibits remarkable performance in various cold working processes, including coining, riveting, crimping, flanging, cold extrusion, and other similar operations.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 68.50 | 72.50 |
| Pb | – | 0.05 |
| Fe | – | 0.07 |
| Sn | 0.90 | 1.30 |
| Ni | – | 0.10 |
| P | – | 0.01 |
| Mn | – | 0.10 |
| As | 0.06 | 0.06 |
| Total Others | – | 0.30 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO EN12451 (AS PER TEMPER R360)
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 360 | 140 | 45 | – | – |
| Hex (A/F) | 3 | 70 | 360 | 140 | 45 | – | – |
| Square (A/F) | 3 | 60 | 360 | 140 | 45 | – | – |
| PHYSICAL PROPERTIES | |
| Electrical conductivity %IACS | 25% |
| Thermal conductivity But ft/ft² hºF | 63 |
| Thermal expansion coefficient (0–300 °C) | 10-6/K 19.7 |
| Density | 8.55 g/cm3 |
| Modulus of elasticity (68 ºF) | 4100 (Kg/mm²) |
| FABRICATION PROPERTIES | |
| Machinability (CuZn39Pb3 = 100 %) | 30% |
| Capacity for being cold worked | Good |
| Capacity for being hot worked | Fair |
| Resistance welding (butt weld) | Good |
| Inert gas shielded arc welding | Fair |
| Gas welding | Good |
| Hard soldering | Excellent |
| Soft soldering | Excellent |
| Melting range | 890 – 970 °C |
| Hot working | 680-780 °C |
| Soft annealing (1–3 h) | 450–650 °C |
| Thermal stress relieving (1–3 h) | 250–350 °C |
