CZ124
CZ124, a free machining brass alloy resulting from the fusion of copper and zinc, exhibits the highest level of machinability among all copper alloys, serving as the benchmark for comparison. CZ124 Brass is renowned for its strength and corrosion resistance, closely resembling steel properties, making it a widely used copper alloy today. Achieving precision in machining with CZ124 Brass is a straightforward task. Although ductile when softened, CZ124 Brass remains robust and retains its strength even under demanding conditions. CZ124 Brass develops a thin protective “patina,” distinct from steel and iron, which prevents rust formation when exposed to the atmosphere. Due to its high density, CZ124 Brass is particularly suitable for fabricating heavy industrial components. The refined polished finish is also a valued trait of CZ124 Brass. This versatile material is available in various forms, including rounds, flats, squares, hexagons, shapes, and hollows.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 60.00 | 63.00 |
| Pb | 2.50 | 3.70 |
| Fe | – | 0.30 |
| Total Others Excl Fe | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M )
| Range | From | To | UTS Min (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min | Hardness Max | |
| Round (Dia) | 1.5 | 25 | 330 | 130 | 12 | – | – | |
| 25 | 50 | 300 | 115 | 18 | – | – | ||
| 50 | 75 | 280 | 95 | 22 | – | – | ||
| Hex (A/F) | 3 | 25 | 330 | 130 | 12 | – | – | |
| 25 | 50 | 300 | 115 | 18 | – | – | ||
| 50 | 70 | 280 | 95 | 22 | – | – | ||
| Square (A/F) | 3 | 12 | 300 | 115 | 18 | – | – | |
| 12 | 25 | 310 | 105 | 12 | – | – | ||
| 50 | 75 | 280 | 95 | 22 | – | – | ||
| Rectangle (Thickness) | 3 | 25 | 300 | 115 | 18 | – | – | |
| 25 | 50 | 280 | 95 | 22 | – | – | ||
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Densitylb/cu in. at 68°F | 0.307 |
| Specific Gravity | 8.5 |
| Electrical Conductivity% IACS at 68°F | 26 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.4 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 14000 |
| Modulus of Rigidityksi | 5300 |
| FABRICATION PROPERTIES | |
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 100 |
