C2700
C2700, classified as engraving brass, belongs to the 60/40 alpha-beta brass family with varying levels of lead added to enhance free machining characteristics. These alloys find extensive use in crafting engraved plates, plaques, builders’ hardware, and gears. However, they are not recommended for acid etched work, which calls for the use of single phase alpha brasses.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 63.00 | 68.5 |
| Pb | – | 0.09 |
| Fe | – | 0.07 |
| Zn | Remainder | |
| (1) Cu + Sum of Named Elements 99.7% min. | ||
MECHANICAL PROPERTIES ACCORDING TO JIS C3712 (AS PER TEMPER BD)
| Range | From | To | UTS Min (Mpa) | PS Min | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 355 | – | 10 | – | – |
| 6 | 50 | 355 | – | 20 | – | – | |
| Hex (A/F) | 3 | 70 | 355 | – | 10 | – | – |
| 6 | 50 | 355 | – | 20 | – | – | |
| Square (A/F) | 3 | 60 | 355 | – | 10 | – | – |
| 6 | 50 | 355 | – | 20 | – | – | |
| Rectangle (Thickness) | 3 | 50 | 355 | – | 10 | – | – |
| 6 | 50 | 355 | – | 20 | – | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1710 |
| Melting Point – Solidus°F | 1660 |
| Densitylb/cu in. at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity% IACS at 68°F | 27 |
| Thermal ConductivityBtu/ 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 CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 15000 |
| Modulus of Rigidityksi | 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 | Excellent |
| Capacity for Being Hot Formed | Poor |
| Machinability Rating | 30 |
