ZN Section »
ZA2
ZL2 is a Zinc based alloy which can be used for hot chamber pressure diecast components or gravity casting.
Application Pressure diecasting
ZL 2 is used selectively for small castings where hardness and high tensile strength are essential properties. The high copper content of this alloy tends to reduce the dimensional stability and long term retention of mechanical properties is not as good as ZL 3 or 5 particularly when higher service conditions are expected. ZL 2 also suffers from a severe loss of ductility during ageing and should be avoided if post forming of the casting is envisaged. When designing a stressed component using ZL2 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.
| Alloy Designation |
ZnAL4Cu3 |
Colour code |
White + Green. |
| Short designation |
ZL 2 |
Alloy Number. |
ZL0430 |
MECHANICAL PROPERTIES
| Supplied in diecast form. |
As Cast |
Aged |
| Tensile strength |
404 MPa |
310 MPa |
| Yield strength |
320 MPa |
241 MPa |
| Impact strength |
29 Joules |
19 joules |
| Elongation 50mm |
4-7% |
10% |
| Shear strength |
296 MPa |
234 MPa |
| Compressive yield |
269 MPa |
183 MPa |
| strength |
| Fatigue Strength |
– |
– |
| Hardness BHN 500Kg |
105 max |
91 max |
PHYSICAL PROPERTIES
| Melting range |
374 - 404 deg C |
| Density |
6.0 g / cm 3 |
| Coefficient of Thermal expansion |
27.4 um/m deg C |
| Thermal Conductivity |
109 W/m deg C |
| Electrical Conductivity |
26 % IACS |
| Electrical Resistivity |
6.5359 u ohm-cm at 20 |
| deg C |
