IS2704
IS2704 takes the lead as the standard material for machining. These alloys also shine in hot stamping, especially when the forged parts undergo extensive post-forging machining. They are the ideal choice for applications that involve minimal cold working with minimal reduction, such as knurling. Thanks to their remarkable ductility, these materials are exceptionally well-suited for crafting wires, rods, and sections.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 62.00 | 65.00 |
| Pb | 0.75 | 1.50 |
| Fe | – | 0.10 |
| Total Others | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO IS 2704(AS PER TEMPER HB)
| Range (Imm) | From | To | UTS Min (MPa) | UTS Max (MPa) | PS Min | Elongation Min (%) | Hardness Min (HV) | Hardness Max (HV) |
| Round (A/F) | 1.5 | 6 | 400 | 490 | – | 20 | 131 | 150 |
| Hex (A/F) | 3 | 6 | 400 | 490 | – | 20 | 131 | 150 |
| Square (A/F) | 3 | 6 | 400 | 490 | – | 20 | 131 | 150 |
| Rectangle (Thickness) | 6 | 12 | 400 | 490 | – | 20 | 131 | 150 |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1700 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity % IACS at 68°F | 26 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.3 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
| FABRICATION PROPERTIES | |
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Poor |
| Machinability Rating | 70 |
