CW718 is a special brass with medium strength, high resistance to atmospheric corrosion as well as good sliding properties due to the alloying constituent’s manganese and aluminium. CW718R is used as standard bearing alloy for medium load applications in machine construction.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 59.00 |
| Pb | 0.20 | 0.80 |
| Al | 0.30 | 1.30 |
| Fe | – | 0.50 |
| Mn | 0.80 | 1.80 |
| Ni | – | 0.50 |
| Sn | – | 0.50 |
| Si | – | 0.50 |
| Total others | – | 0.30 |
| Zn | Remainder |
Mechanical Properties According To EN12165 CW718 (As Per Temper H130)
| Range (mm) | From | To | UTS Min (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min (HB) | Hardness Max |
| Round (Dia) | 6 | 75 | – | – | – | 130 | – |
| Hex (A/F) | 6 | 70 | – | – | – | 130 | – |
| Square (A/F) | 6 | 60 | – | – | – | 130 | – |
| Rectangle (Thickness) | 6 | 50 | – | – | – | 130 | – |
| PHYSICAL PROPERTIES |
| Electrical conductivity | 7.8 %IACS |
| Thermal conductivity | 63 W/(m•K) |
| Thermal expansion coefficient (0–300 °C) | 21.1 10-6/K |
| Density | 8.24 g/cm³ |
| Modulus of elasticity | 93 Gpa |
| FABRICATION PROPERTIES |
| Machinability (CuZn39Pb3 = 100 %) | 40% |
| 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 | Poor |
| Hard soldering | fair |
| Soft soldering | Poor |
| Melting range | 860-910 °C |
| Hot working | 600–700 °C |
| Soft annealing | 500–650 °C (1–3 hr) |
| Thermal stress relieving | 300–430 °C (1-3 hr) |
Typical Uses
