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Zamak

Zamak die casting is, in the case of metals, the shortest path between raw material and the desired part, and its applications encompass virtually all sectors.

Its main advantages respect to other alloys are:

• - Greater dimensional accuracy and achievement of stricter tolerances: Less secondary machinings.
• - Greater lasting moulds (more than six times more than aluminium and twice that of magnesium); lesser cost of maintenance and replacement of moulds.
• - Ideal disposition for galvanic coatings (cromium, brass etc), wider possibilities for finishing and presentation of parts.

Main characteristics of commercial alloy ZAMAK-5 (EN 1774)

ZAMAK CHEMICAL COMPOSITION

In accordance with the norm UNE-EN 12844
Denomination: ZP5

Parts Chemical Composition (%)

Aluminium	Al	3,7   -   4,3
Magnesium	Mg	0,025 - 0,06
Copper	Cu	0,7   -   1,2
Iron	Fe	máx.  0,050
Lead	Pb	máx.  0,005
Cadmium	Cd	máx.  0,005
Tin	Sn	máx.  0,002
Nickel	Ni	máx.  0,02
Silicium	Si	máx.  0,03

In accordance with the norm: UNE-EN 1774

Ingots Chemical Composition (%)

Aluminium	Al	3,8  -   4,2
Magnesium	Mg	0,035 - 0,06
Copper	Cu	0,7   -   1,1
Iron	Fe	máx.  0,020
Lead	Pb	máx.  0,003
Cadmium	Cd	máx.  0,003
Tin	Sn	máx.  0,001
Níckel	Ni	máx.  0,001
Silicium	Si	máx.  0,02

Denomination: ZnAl4Cu1 - ZL5

Physical Properties

Density at 20ºC	g/cm³	6,7
Fusion Interval	ºC	380-386
Casting temperature	ºC	410-430
Contraction at solidification	mm/m	5
Expansion coefficient	x 10-6 K-1	27,4
Fusion heat	KJ/kg	105
Specific heat	J/kg x K	419
Thermal conductivity	W/m x K	108
Electrical conductivity	%IACS	26

Mechanical Properties for hot chamber cast parts

Tensile Strength	N/mm²	280-350
Elongation	%	3 - 8
Brinell hardness		85 - 105
Impact resistance	J	65

(Charpy 6,35 x 6,35 unnotched)

* These properties given are for information purposes only and differ depending on the sape of the part and casting parameters.

Salt Spray resistence

The required resistence can be obtained with a corresponding thickness of the coating, and its cost would be proportional.
BICHROMATE	Usually from 120 to 200 hours
CROMIUM	From 400 to 1000 hours

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