CuZn28
LAITON
Cu71-73 Zn reste Pb0.03 max
| Chemical composition |
|---|
Cu71-73
Ni0.3 max
ZnBAL
Pb0.03 max
Sn0.1 max
Fe0.05 max
Al0.02 max
| Alloy name | |
|---|---|
| RLSA no. | 300 |
| EN standard | CW504L |
| DIN standard | 2.0261 |
| UNS no.* | C25600 |
*Unified Numbering System (USA)
Characteristics and main uses
CuZn28 is a solid-solution strengthened copper alloy containing 28% zinc (brass). An alloy with less than 36% zinc is therefore a single-phase alloy. The alloy has very good cold-forming properties and can be brazed or welded. As zinc content increases, mechanical strength improves, but conductivity and ductility are reduced, and the alloy becomes more susceptible to stress corrosion cracking if exposed to an ammonia atmosphere, compared to pure copper. When exposed to an ammonia atmosphere, CuZn28 should be thermally relaxed. Particularly suitable for watch hands and indexes
| Physical properties | Units | |
|---|---|---|
| Density (20°C) | 8,55 | Kg/dm³ |
| Melting point | 915-965 | °C |
| Longitudinal elasticity modulus | 114 | GPa |
| Thermal conductivity | W/m·K | |
| Electrical conductivity | >16.5 | m/Ω·mm² |
| Electrical resistivity | <0.06 | µΩ·m |
| Linear expansion Coefficient | 19,7 | 10⁻⁶·K⁻¹ |
| IACS (International Annealed Copper Standard) | >29 | % |
| Poisson's ratio |
| Capabilities | |
|---|---|
| Corrosion resistance | 3 |
| Hot deformation | 3 |
| Cold deformation | 4 |
| Electrodepositing | 4 |
| Diamond cutting | 4 |
| Nitriding | |
| Mechanical polishing | 4 |
| Welding without filler | 3 |
| Brazing | 4 |
1 poor | 2 average | 3 good | 4 very good | - no info
