C26000
Both CuZn30 and CuZn28 alloys exhibit a combination of outstanding cold forming capabilities and solid mechanical strength. CuZn30 stands out for its good hot forming characteristics and exceptional soldering and brazing properties. These attributes, particularly the exceptional deep drawing capabilities of CuZn30 and the other two alloys mentioned, have earned them the monikers “deep-draw” or “cartridge” brass.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 68.50 | 71.50 |
| Pb | – | 0.07 |
| Fe | – | 0.05 |
| Total Others | – | 0.30 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO ASTM B927 (AS PER TEMPER HO2)
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 12 | 345 | 170 | 10 | – | – |
| 12 | 25 | 310 | 115 | 20 | – | – | |
| 25 | 50 | 275 | 105 | 20 | – | – | |
| Hex (A/F) | 3 | 12 | 345 | 170 | 10 | – | – |
| 12 | 25 | 310 | 115 | 20 | – | – | |
| 25 | 50 | 275 | 105 | 20 | – | – | |
| Square (A/F) | 3 | 12 | 345 | 170 | 10 | – | – |
| 12 | 25 | 310 | 115 | 20 | – | – | |
| 25 | 50 | 275 | 105 | 20 | – | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1750 |
| Melting Point – Solidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.308 |
| Specific Gravity | 8.53 |
| Electrical Conductivity % IACS at 68°F | 28 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 70 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.1 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 16000 |
| Modulus of Rigidity ksi | 6000 |
| FABRICATION PROPERTIES | |
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Good |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Fair |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 30 |
