C3712
C3712, classified as Engraving brass, are alpha-beta brasses with a 60/40 composition, incorporating varying quantities of lead to enhance free machining attributes. These alloys find extensive application in engraved plates and plaques, builders’ hardware, and gear manufacturing. It’s essential to note that they are not suitable for acid etched applications, where single phase alpha brasses are more appropriate.
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 |
