Description
CZ128 constitutes a machining brass that adeptly harmonizes the divergent material characteristics of machining and cold working. As a result, this material has firmly established itself as the prevailing standard alloy for machining and cold working applications across a multitude of industries.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 58.50 | 61.00 |
| Pb | 1.50 | 2.50 |
| Fe | – | 0.20 |
| Total Others | – | 0.50 |
| Zn | Remainder |
Mechanical Properties According To BS2874 (As Per Temper M)
| Range (mm) |
From |
To |
UTS Min (N/mm²) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) |
6 |
18 |
380 |
– |
22 |
– |
– |
| 18 |
40 |
380 |
– |
22 |
– |
– |
| 40 |
75 |
350 |
– |
25 |
– |
– |
| Hex (A/F) |
6 |
18 |
380 |
– |
22 |
– |
– |
| 18 |
40 |
380 |
– |
22 |
– |
– |
| 40 |
70 |
350 |
– |
25 |
– |
– |
| Square (A/F) |
6 |
18 |
380 |
– |
22 |
– |
– |
| 18 |
40 |
380 |
– |
22 |
– |
– |
| 40 |
60 |
350 |
– |
25 |
– |
– |
| Rectangle (Thickness) |
6 |
18 |
380 |
– |
22 |
– |
– |
| 18 |
40 |
380 |
– |
22 |
– |
– |
| 40 |
50 |
350 |
– |
25 |
– |
– |
| PHYSICAL PROPERTIES |
| Density | 8.44 g/cm³ |
| Electrical Conductivity % IACS at 68°F | 24 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 109 W/m.K |
| Thermal expansion coefficient | 20.4 10-6/K |
| Modulus of Elasticity | 102 Gpa |
Fabrication Properties
| FABRICATION PROPERTIES |
| Machinability (CuZn39Pb3 = 100 %) | 90% |
| Capacity for being cold worked | fair |
| Capacity for being hot worked | excellent |
| Resistance welding (butt weld) | good |
| Inert gas shielded arc welding | poor |
| Gas welding | Poor |
| Hard soldering | fair |
| Soft soldering | excellent |
| Melting range | 895-900 °C |
| Hot working | 650-750 °C |
| Soft annealing | 450-650 °C (1–3 hr) |
| Thermal stress relieving | 200-300 °C (1-3 hr) |
