CW706R
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) |
UTS Max (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
| PHYSICAL PROPERTIES |
| Electrical conductivity %IACS |
25% |
| Thermal conductivity But ft/ft² hºF |
63 |
| Thermal expansion coefficient (0–300 °C) |
10?? /K 19.7 |
| Density |
8.55 g/cm3 |
| Modulus of elasticity (68 ºF) |
4100 (Kg/mm²) |
Fabrication Properties
| FABRICATION PROPERTIES |
| Technique |
Suitability |
| 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 |
