Zamak 27

zamak
Project Description

ZnAl27Cu2 / ZL27 / Zamak 27

Zamak 27

Zamak 27 contains 27% aluminum content and is the strongest of the Zamak series.

zamak
çinko
zamak

Zamak 27, or zinc aluminum alloy, contains significantly more aluminum than the Zamak group of alloys. The number 27 represents the approximate percentage of aluminum

It is extremely difficult to handle and has poor die filling characteristics, which can be offset by simplifying the casting design.

Zamak 27 is 40% stronger and harder than typical aluminum die cast alloys and also offers bearing properties not seen in other alloys

Zamak 27 has the highest aluminum content, highest strength, highest melting point, and lowest density of the zamak group
This zinc alloy exhibits excellent bearing properties, which allow bearings to be designed into the casting of some applications
Its relatively high casting temperature requires the cold-chamber process
Chemical, Physical and Mechanical Properties

Zamak 27 Chemical Analysis

Analysis  ( %) Zamak 27 / ZnAl27Cu2
Al 25.5 – 28.0
Cu 2.0 – 2.5
Mg 0.012 – 0.020
Pb ≤0.005
Fe ≤0.07
Cd ≤0.005
Sn ≤0.002
Si ≤0.04
Ni ≤0.001

Zamak 27 General Mechanical Properties

Mechanical Properties Metric Value
Ultimate Tensile Strength 421 MPa
Yield Strength 379 MPa
Impact Strength 5 J
Elongation % in 2 1 – 3
Shear Strength 325 MPa
Compressive Yield Strength 385 MPa
Fatigue Strength (reverse bending 5×108cycles) 145 MPa
Hardness 105 – 125 Brinell

Zamak 27 General Physical Properties

Physical Properties Metric Value
Solidification Range (melting range) 376 – 484 C
Density 5.0 kg/dm3
Coefficient of Thermal Expansion 26.0 μm/m-°C
Thermal Conductivity 125.5 W/mK
Specific Heat Capacity 534 J/kg-°C