C3712, Engraving brass, are 60/40 alpha-beta brasses with different levels of lead added to give free machining properties. They are widely used for engraved plates and plaques, builders hardware, gears. They should not be used for acid etched work, for which the single phase alpha brasses should be used.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 58.00 | 62.00 |
| Pb | 0.25 | 1.20 |
| Fe+Sn | – | 0.80 |
| Zn | Remainder |
MECHANICAL PROPERTIES ACCORDING TO EN12164 (AS PER TEMPER R410)
| Range (mm) | From | To | UTS Min (MPa) | PS Min | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 6 | 75 | 315 | – | 15 | – | – |
| Hex (A/F) | 6 | 70 | 70 | – | 15 | – | – |
| Square (A/F) | 6 | 60 | 315 | – | 15 | – | – |
| Rectangle (Thickness) | 6 | 50 | 315 | – | 15 | – | – |
| PHYSICAL PROPERTIES |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.304 |
| Specific Gravity | 8.41 |
| Electrical Conductivity % IACS at 68°F | 27 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 69 |
| 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 | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Not Recommended | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Excellent |
| Machinability Rating | 70 |
TYPICAL USES
