CZ131 is a material which has been successfully used in automotive industries. It has both good machining and good cold working properties.
Chemical Composition
| Elements |
Min (%) |
Max (%) |
| Cu |
61.00 |
63.00 |
| 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) |
UTS Max (N/mm²) |
PS Min (N/mm²) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) |
1.5 |
18 |
350 |
– |
– |
22 |
– |
– |
| 18 |
40 |
350 |
– |
– |
25 |
– |
– |
| 40 |
75 |
350 |
– |
– |
28 |
– |
– |
| Hex (A/F) |
3 |
18 |
350 |
– |
– |
22 |
– |
– |
| 18 |
40 |
350 |
– |
– |
25 |
– |
– |
| 40 |
70 |
350 |
– |
– |
28 |
– |
– |
| Square (A/F) |
3 |
18 |
350 |
– |
– |
22 |
– |
– |
| 18 |
40 |
350 |
– |
– |
25 |
– |
– |
| 40 |
60 |
350 |
– |
– |
28 |
– |
– |
| Rectangle |
Thickness 3 |
18 |
350 |
– |
– |
22 |
– |
– |
| Thickness 18 |
40 |
350 |
– |
– |
25 |
– |
– |
| Thickness 40 |
50 |
350 |
– |
– |
28 |
– |
– |
| PHYSICAL PROPERTIES |
| Melting Point |
885° |
| Density |
8.50g/cm3 |
| Electrical Resistivity |
0.066 × 10-6Ωm |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F |
115 W/m.K |
| Modulus of Elasticity |
105 (GPa) |
| FABRICATION PROPERTIES |
| Technique |
Suitability |
| Hot Formability |
Good |
| Cold Formability |
Good |
| Cold Reduction Between anneals |
50% |
| Machinability rating (free cutting brass = 100) |
75% |
| Soldering |
Excellent |
| Brazing |
Good |
| Oxyacetylene Welding |
Not Recommended |
| Gas Shielded Arc Welding |
Not Recommended |
| Resistance welding : Spot and Seam |
Not Recommended |
| Butt Welding |
Fair |
