IS 319 Gr III: A ductile alloy with good machinability as well as bending and cold heading properties. Suitable for bicycle spoke nipples.
Chemical Composition
| Elements |
Min (%) |
Max (%) |
| Cu |
62.00 |
63.00 |
| Pb |
0.50 |
1.50 |
| Fe |
– |
0.20 |
| Total Others |
– |
0.50 |
| Zn |
Remainder |
Mechanical properties according To IS 319 Gr III (as per temper HB)
| Range (mm) |
UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) |
6 |
12 |
355 |
– |
– |
8 |
– |
– |
| 12 |
25 |
345 |
– |
– |
12 |
– |
– |
| 25 |
50 |
305 |
– |
– |
22 |
– |
– |
| 50 |
75 |
285 |
– |
– |
27 |
– |
– |
| Hex (A/F) |
6 |
12 |
355 |
– |
– |
8 |
– |
– |
| 12 |
25 |
345 |
– |
– |
12 |
– |
– |
| 25 |
50 |
305 |
– |
– |
22 |
– |
– |
| 50 |
75 |
285 |
– |
– |
27 |
– |
– |
| Square (A/F) |
6 |
12 |
355 |
– |
– |
8 |
– |
– |
| 12 |
25 |
345 |
– |
– |
12 |
– |
– |
| 25 |
50 |
305 |
– |
– |
22 |
– |
– |
| 50 |
75 |
285 |
– |
– |
27 |
– |
– |
| PHYSICAL PROPERTIES |
| Density |
8.46 g/cm3 |
| Melting Point |
910°C |
| Specific heat cap at 20°C |
0.377 (kj/kgK) |
| Electrical conductivity |
14.7 (MS/m) |
| Mod of elasticity |
105 (GPa) |
| Coef of therm exp at 20°C |
20.4 (10-6 /K) |
| Thermal Conductivity |
116 W/m.K |
| FABRICATION PROPERTIES |
| Technique |
Suitability |
| Machinability (CuZn39Pb3 = 100 %) |
80% |
| Capacity for Being Cold Worked |
Poor |
| Capacity for Being Hot Worked |
Fair |
| Suitability for Soldering |
Excellent |
| Suitability for Brazing |
Good |
