CW621N
DESCRIPTION
CW621N is a lead free material which is however quite suitable for machining Due to its structural constitution. CW621N can be therefore used as a cost-effective Replacement for conventional lead-containing machining brass provided that it must not meet high requirements as regards mechanical properties and corrosion Resistance.
CHEMICAL COMPOSITION
| Elements |
Min (%) |
Max (%) |
| Cu |
55.50 |
59.00 |
| Pb |
0.20 |
0.80 |
| Sn |
- |
0.30 |
| Fe |
- |
0.30 |
| Al |
0.05 |
0.50 |
| Ni |
0.30 |
0.30 |
| Total Others |
- |
0.20 |
| Zn |
Remainder |
MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
No Mechanical properties for this alloy. Mechanical properties as agreed between punchers and supplier.
| PHYSICAL PROPERTIES |
| Electrical conductivity %IACS |
31 |
| Thermal conductivity W/(m·K) |
139 |
| Thermal expansion coefficient (0–300 °C) |
10-6 /K 21.70 |
| Density |
8.41 g/cm3 |
| Modulus of elasticity |
107 Gpa |
| FABRICATION PROPERTIES |
| Machinability (CuZn39Pb3 = 100 %) |
60% |
| Capacity for being cold worked |
Poor |
| Capacity for being hot worked |
Excellent |
| Resistance welding (butt weld) |
Good |
| Inert gas shielded arc welding |
Fair |
| Gas welding |
Fair |
| Hard soldering |
Good |
| Soft soldering |
Excellent |
| Melting range |
870–900 °C |
| Hot working |
650–750 °C |
| Soft annealing (1–3 h) |
450–550 °C |
| Thermal stress relieving (1–3 h) |
250–350 °C |
TYPICAL USES
- Builders Hardware
- Consumer
