CW505L
Both CuZn30 and CuZn28 alloys exhibit an impressive combination of cold forming capabilities and solid mechanical strength. CuZn30, in particular, boasts excellent hot forming characteristics and excels in soldering and brazing applications. These alloys, including CuZn30, are commonly referred to as “deep-draw” or “cartridge” brass due to their exceptional deep drawing properties.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 69.00 | 71.00 |
| Pb | – | 0.05 |
| Fe | – | 0.05 |
| Sn | – | 0.10 |
| Ni | – | 0.30 |
| Al | – | 0.02 |
| Total Others | – | 0.10 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO ASTM B927 (AS PER TEMPER HO2)
| Range (mm) | From | To | UTS Min (N/mm²) | UTS Max (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 75 | 350 | 430 | – | 21 | – | |
| Hex (A/F) | 3 | 70 | 350 | 430 | – | 21 | – | – |
| Square (A/F) | 3 | 60 | 350 | 430 | – | 21 | – | – |
| 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 |
