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 |
