CZ128
CZ128 Spec SheetCZ128 is a machining brass which combines the contrasting material Properties of machining and cold working exceptionally well. This material is therefore well established in various industries as the standard alloy for machining and cold Working.
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) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| 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 | |
|---|---|
| Technique | Suitability |
| 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) |
Typical Uses
Furniture
Window fittings
Valve
Valve parts
Decorative metalwork
Clock and instrument
Casings
Gears
Cams
