IS 4170 is a lead free material which is however quite suitable for machining due to its structural constitution. IS 4170 can be used as a cost-effective replacement for conventional lead-containing machining brass provided that it must not meet high requirements as regards mechanical properties and corrosion resistance
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 59.00 | 62.00 |
| Pb | – | 0.75 |
| Fe | – | 0.10 |
| Total Others | – | 0.30 |
| Zn | Remainder |
MECHANICAL PROPERTIES ACCORDING TO IS 4170 (AS PER TEMPER M)
| Range | From | To | UTS Min (Kg/mm²) | PS Min (Kg/mm²) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 35 | – | 25 | – | – |
| Hex (A/F) | 3 | 70 | 35 | – | 25 | – | – |
| Square (A/F) | 3 | 60 | 35 | – | 25 | – | – |
| Rectangle (Thickness) | 3 | 50 | 35 | – | 25 | – | – |
| PHYSICAL PROPERTIES |
| Melting Point – Liquidus°F | 1660 |
| Melting Point – Solidus°F | 1650 |
| Density lb/cu in. at 68°F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity % IACS at 68°F | 28 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| 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 | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 90 |
| Machinability Rating | 40 |
TYPICAL USES
- Architecture
- Builders Hardware
- Fasteners
- Industrial
