CW706R is a dezincification resistant brass with excellent cold working properties and a pure α-structure. This alloy is used for applications in warm, acidic waters. CW707R is also suitable for coining, riveting, crimping, flanging, cold extrusion or other cold working 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 |
TYPICAL USES
- Architecture
- Automotive
- Builders Hardware
- Consumer
- Electrical
- Fasteners
- Industrial
- Ordnance
- Plumbing
