IS 319 GR III
IS 319 Gr III is a ductile alloy renowned for its excellent machinability and its ability to be easily bent and cold-headed. These attributes make it a fitting choice, particularly for the production of 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) | From | To | UTS Min (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 | |
| Machinability (CuZn39Pb3 = 100 %) | 80% |
| Capacity for being cold worked | poor |
| Capacity for being hot worked | Fair |
| Suitability for soldering | Excellent |
| Suitability for Brazing | Good |
