Grade Zamak 7 Alloy UNS Z33522 (Ingot), UNS Z33523 (Castings)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

Introduction

Zamak 7 alloy is a high-purity alloy with lower magnesium content and slightly better ductility than zamak 3 alloys. The alloy is added with a small amount of nickel in order to reduce inter-granular corrosion and control impurities. The high ductility exhibited by this alloy also has an impact on processing, particularly in secondary operations for flash removal and trimming.

The alloy also exhibits excellent damping capacity and vibration when compared to aluminum die casting alloys.

The following datasheet will provide an overview of zamak 7 alloy.

Chemical Composition

The chemical composition of zamak 7 alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 3.5-4.3
Copper, Cu 0.25
Iron, Fe 0.075
Nickel, Ni 0.005-0.02
Magnesium, Mg 0.005-0.02
Lead, Pbsss 0.003
Cadmium, Cd 0.002
Tin, Sn 0.001
Zinc, Zn Remainder

Physical Properties

The following table shows the physical properties of zamak 7 alloy.

Properties Metric Imperial
Density 6.6 g/cm3 0.24 lb/in3
Melting point 381-387°C 718-728°F

Mechanical Properties

The mechanical properties of zamak 7 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 283 MPa 441 psi
Yield strength 221 MPa 32 psi
Elongation at break 13% 13%
Brinell hardness 80 80

Thermal Properties

The thermal properties of zamak 7 alloy are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient 27.4 µm/m°C 15.2 µin/in°F
Thermal conductivity 113 W/mK 784 BTU.in/hrft².°F

Applications

Zamak 7 alloy is used in special cases where the die caster is employed for making thin walled components that requires a good surface finish.

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