CW707R
CW707R is a brass alloy designed to resist dezincification while maintaining superb cold working characteristics and a pure α-structure. It’s particularly well-suited for applications in warm, acidic waters. Additionally, CW707R can be effectively employed in processes like coining, riveting, crimping, flanging, cold extrusion, and other cold working operations.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 68.50 | 71.50 |
| Pb | – | 0.07 |
| Fe | – | 0.05 |
| As | 0.02 | 0.06 |
| Total Others | – | 0.20 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO EN12451 (AS PER TEMPER R340)
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 340 | 130 | 45 | – | – |
| Hex (A/F) | 3 | 70 | 340 | 130 | 45 | – | – |
| Square (A/F) | 3 | 60 | 340 | 130 | 45 | – | – |
| PHYSICAL PROPERTIES | |
| Electrical conductivity %IACS | 28% |
| Thermal conductivity W/(m·K) | 126 |
| Thermal expansion coefficient (0–300 °C) | 10-6/K 19.7 |
| Density | 8.55 g/cm3 |
| Modulus of elasticity | 114 Gpa |
| FABRICATION PROPERTIES | |
| Machinability (CuZn39Pb3 = 100 %) | 25% |
| Capacity for being cold worked | Excellent |
| 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 | 910-965 °C |
| Hot working | 750 – 870 °C |
| Soft annealing (1–3 h) | 450–680 °C |
| Thermal stress relieving (1–3 h) | 200–300 °C |
