Description
CZ122 serves as the standard material for hot working operations. The average lead content contributes to favorable machinability of drop-forged components. Additionally, owing to its composition, the alloy is well-suited for fabricating intricate profiles and producing complex shapes through drawing processes.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 56.50 | 58.50 |
| Pb | 1.50 | 2.50 |
| Fe | – | 0.30 |
| Total Others | – | 0.70 |
| Zn | Remainder |
Mechanical Properties According To BS2874 (As Per Temper M)
| Range |
From |
To |
UTS Min (N/mm²) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) |
1.5 |
18 |
380 |
– |
25 |
– |
– |
| 18 |
40 |
380 |
– |
25 |
– |
– |
| 40 |
75 |
350 |
– |
28 |
– |
– |
| Hex (A/F) |
3 |
18 |
380 |
– |
25 |
– |
– |
| 18 |
40 |
380 |
– |
25 |
– |
– |
| 40 |
70 |
350 |
– |
28 |
– |
– |
| Square (A/F) |
3 |
18 |
380 |
– |
25 |
– |
– |
| 18 |
40 |
380 |
– |
25 |
– |
– |
| 40 |
60 |
350 |
– |
28 |
– |
– |
| Rectangle (Thickness) |
3 |
18 |
380 |
– |
25 |
– |
– |
| 18 |
40 |
380 |
– |
25 |
– |
– |
| 40 |
50 |
350 |
– |
28 |
– |
– |
| Physical Properties | Metric | English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
Fabrication Properties
| Forming | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 95.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
