CuZn30 as well as CuZn28 is combining excellent cold forming properties with good mechanical strength. CuZn30 has good hot forming properties and excellent soldering and brazing properties. Due to the outstanding deep drawing properties CuZn30 and the other two mentioned alloys are called “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 |
TYPICAL USES
- Architecture
- Automotive
- Builders Hardware
- Consumer
- Electrical
- Fasteners
- Industrial
- Ordnance
- Plumbing
