EN 12844: GD-ZnAl4 Alloy – Optimal for High-Precision Diecastings
The material GD-ZnAl4, material NR. 2.4140, characteristic Z 400, one uses for diecastings. If there are high requirements to the accuracy to size of the products produced by diecasting, this alloy should be preferred. The material is substantially more ductile than the other high quality casting alloys. These characteristics however bought by somewhat worse physical properties and a somewhat smaller corrosion resistance in relation to intergranular corrosion in the comparison to Z 410. The casting temperature is about 425 °C (max. 450 °C) amounted to, the form temperature (pressure pouring) is on approximately 180 to max. to adjust 250 °C.
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 20.0 °C | 6.6 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 20.0 °C | 130 GPa | |
Elongation | 20.0 °C | 3 - 6 % | |
Hardness, Brinell | 20.0 °C | 70 - 90 [-] | |
Poisson's ratio | 23.0 °C | 0.3 [-] | Typical for Zinc Aluminium |
Tensile strength | 20.0 °C | 250 - 300 MPa | |
Yield strength Rp0.2 | 20.0 °C | 200 - 230 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 2.2E-5 - 2.8E-5 1/K | Typical for Zinc Aluminium |
Melting point | 375 - 485 °C | Typical for Zinc Aluminium | |
Specific heat capacity | 20.0 °C | 427 J/(kg·K) | |
Thermal conductivity | 20.0 °C | 92 - 100 W/(m·K) |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical conductivity | 20.0 °C | 1.50E+7 - 1.60E+7 S/m |
Chemical properties
| Property | Value |
|---|---|
Aluminium | 3.5 - 4.3 % |
Copper | 0.1 % |
Iron | 0.05 % |
Magnesium | 0.02 - 0.06 % |
Nickel | 0.02 % |
Tin | 2E-3 % |
Zinc | 95.4 % |
Technological properties
| Property | ||
|---|---|---|
| Processing methods | pressure die casting, separately cast test sample | |
Metal
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