Description
CW710R is a type of brass that is easily extrudable. It falls under the category of leaded alpha/beta brass with an added element of aluminum, which imparts a vibrant golden hue to its appearance. The inclusion of a small amount of lead enhances its free-cutting characteristics, making it conducive for machining and other applications where ease of cutting is important.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 58.00 | 60.00 |
| Pb | 0.20 | 0.80 |
| Al | 0.30 | 1.30 |
| Fe | – | 0.50 |
| Mn | 1.50 | 2.50 |
| Ni | 2.00 | 3.00 |
| Sn | – | 0.50 |
| Si | – | 0.10 |
| Total Others | – | 0.30 |
| Zn | Remainder |
Mechanical Properties According To EN12165 CW710R (As Per Temper H120)
| Range (mm) |
From |
To |
UTS Min (N/mm²) |
PS Min (N/mm²) |
Elongation Min (%) |
Hardness Min (HB) |
Hardness Max (HB) |
| Round (Dia) | 8 | 75 | – | – | – | 120 | 200 |
| Hex (a/F) | 8 | 60 | – | – | – | 120 | 200 |
| Square (A/F) | 8 | 60 | – | – | – | 120 | 200 |
| Rectangle (Thickness) | 8 | 50 | – | – | – | 120 | 200 |
Physcial Properties
| Electrical conductivity | 7.8 %IACS |
| Thermal conductivity | 63 W/(m•K) |
| Thermal expansion coefficient (0–300 °C) | 20.6 10-6/K |
| Density | 8.12 g/cm³ |
| Modulus of elasticity | 93 Gpa |
Fabrication Properties
| Machinability (CuZn39Pb3 = 100 %) | 50% |
| Capacity for being cold worked | Poor |
| Capacity for being hot worked | good |
| Resistance welding (butt weld) | good |
| Inert gas shielded arc welding | fair |
| Gas welding | fair |
| Hard soldering | fair |
| Soft soldering | fair |
| Melting range | 870 – 900 °C |
| Hot working | 600–700 °C |
| Soft annealing | 500–650 °C (1–3 hr) |
| Thermal stress relieving | 350–450 °C (1-3 hr) |
