Zamak 7

Project Description

ZL-7 / Zamak 7

Zamak 7

Zamak 7 has less magnesium than zamak 3 to increase fluidity and ductility, which is especially useful when casting thin wall components.

Zamak 7 proved casting fluidity, ductility and surface finish.
Higher fluidity is sometimes desirable especially on components with intricate detail, however it does present special casting considerations

Zamak 7 is mostly used for special hardware applications, or when castings require extra formability during subsequent assembly operations such as crimping or staking. Its higher fluidity also allows thinner walls to be cast

Zamak 7 exhibits excellent damping capacity and vibration attenuation in comparison with aluminum die casting alloys.
The high ductility exhibited by this alloy also has an impact on processing, but mainly in secondary operations for flash removal and trimming
Its higher fluidity also allows thinner walls to be cast

Zamak 7 Chemical Analysis

Analysis  ( %) Zamak 7 / ZL-7
Al 3.9 – 4.3
Cu ≤ 0.1
Mg 0.01 – 0.02
Pb ≤0.003
Fe ≤0.075
Cd ≤0.002
Sn ≤0.001
Si ≤0.001
Ni ≤0.001

Zamak 7 General Mechanical Properties

Mechanical Properties Metric Value
Ultimate Tensile Strength 285 MPa
Yield Strength (0.2% offset) 285 MPa
Impact Strength 58.0 J
Elongation 14%
Shear Strength 214 MPa
Compressive Yield Strength 414 MPa
Fatigue Strength (reverse bending 5×108cycles) 47.0 MPa
Hardness 80 Brinell

Zamak 7 General Physical Properties

Physical Properties Metric Value
Solidification Range (melting range) 381—387 °C
Density 6.6 g/cm3
Coefficient of Thermal Expansion 27.4 μm/m-°C
Thermal Conductivity 113 W/m-K
Electrical Resistivity 6.4 μΩ-cm
Specific Heat Capacity 419 J/kg-°C