CZ137
CZ137, Engraving brass, are 60/40 alpha-beta brasses with lead added to give free machining properties. They should not be used for acid etched work, for which the single-phase alpha brasses should be used.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 58.50 | 61.00 |
| Pb | 0.30 | 0.80 |
| 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) | UTS Max (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min | Hardness Max | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 6 | 40 | 380 | - | - | 25 | - | - | |
| 40 | 75 | 350 | - | - | 28 | - | - | ||
| Hex (A/F) | 6 | 40 | 380 | - | - | 25 | - | - | |
| 40 | 75 | 350 | - | - | 28 | - | - | ||
| Square (A/F) | 6 | 40 | 380 | - | - | 25 | - | - | |
| 40 | 75 | 350 | - | - | 28 | - | - | ||
| PHYSICAL PROPERTIES | |
|---|---|
| Electrical conductivity %IACS | 31 |
| Thermal conductivity W/(m·K) | 139 |
| Thermal expansion coefficient (0–300 °C) | 10⁻⁶ /K 21.70 |
| Density | 8.36 g/cm3 |
| Modulus of elasticity | 107 Gpa |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 50% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
| Resistance welding (butt weld) | Fair |
| Inert gas shielded arc welding | Fair |
| Gas welding | Fair |
| Hard soldering | Excellent |
| 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
- Automatic Screw Machine Parts
- Blanking
- Riveting
- Brazing
- Upsetting