CZ115 is a duplex high tensile brass with a restricted aluminium content to facilitate soldering and brazing. Sometimes referred to as a manganese bronze, CZ115 has additions of iron, tin and manganese that benefit the physical and mechanical attributes of the alloy.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 56.50 | 58.50 |
| Pb | 0.50 | 1.50 |
| Sn | 0.20 | 0.80 |
| Fe | 0.30 | 1.00 |
| Al | – | 0.10 |
| Mn | 0.50 | 2.00 |
| Total Others | – | 0.50 |
| Zn | Remainder |
Mechanical Properties According To BS2874 CZ115 (As Per Temper M)
| Range (mm) | From | To | UTS Min (N/mm²) | PS Min (N/mm²) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 18 | 460 | 250 | 12 | – | – |
| 18 | 75 | 440 | 210 | 15 | – | – |
| Hex (A/F) | 3 | 18 | 460 | 250 | 12 | – | – |
| 18 | 70 | 440 | 210 | 15 | – | – |
| Square (A/F) | 3 | 18 | 460 | 250 | 12 | – | – |
| 18 | 60 | 440 | 210 | 15 | – | – |
| Rectangle (Thickness) | 6 | 18 | 460 | 250 | 12 | – | – |
| 18 | 50 | 440 | 210 | 15 | – | – |
| PHYSICAL PROPERTIES |
| Melting Point | 940°C |
| Density | 8.42 g/cm³ |
| Specific Heat | 380 J/Kg°K |
| Thermal conductivity (RT) | 88 W/m°K |
| Thermal expansion coefficient (20-200°C) | 20 x 10-6 |
| Electrical conductivity | 18% IACS |
| Electrical Resistivity | 0.082 ohm mm²/m |
| FABRICATION PROPERTIES |
| Capacity for being Cold formed | Poor |
| Capacity for being Hot worked | Good |
| Machinability Ration | 30% |
| Resistance to Corrosion | Excellent |
| Suitability for soldering | Excellent |
TYPICAL USES
- Gas valves and fittings
- Fasteners
- Pump trim
- Gears
- Locks
- Heavy-duty electrical connectors
- Transmission components
- Marine hardware
- Safety tools and decorative metalwork
