IS2704 are the standard materials for machining. These alloys are also particularly suitable for hot stamping when the forged parts are subsequently machined extensively. Is recommended for applications where cold working with little reduction such as knurling is used. The ductility of this material makes it particularly suitable for the manufacture of wires as well as 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 |
TYPICAL USES
- Automotive
- Builders Hardware
- Consumer
- Electrical
- Fasteners
- Industrial
- Ordnance
- Plumbing
