Die Casting Alloys
High pressure die casting casts
non-ferrous alloys only. Although
brass and copper can be die cast,
by far the most commonly cast
alloys world wide are zinc
and magnesium. Del Mar Industries
offers all of the commonly cast
zinc, ZA, and magnesium die casting alloys.
Magnesium
By far the most commonly die cast
magnesium alloy is AZ91D. It is
a high purity alloy that offers
excellent corrosion resistance,
castability and strength. Strict
enforcement of limits on three
metallic impurities; iron, copper
and nickel gives it superior corrosion
resistance. In automotive applications,
AZ91D is used in underbody components
such as transmission, clutch and
transfer case housings without
any special coatings or protection,
testimony to its corrosion resistance
properties. Although special precautions
must be taken while machining,
magnesium alloys exhibit the best
machinability of any commercially
used metal alloys.
Zinc
Zinc alloy die castings offer
outstanding physical and mechanical
properties with excellent castability
and finishing characteristics.
Thinner wall sections can be cast
in zinc alloy than in any other
commonly used die casting alloys.
Zinc alloys are often referred
to as Zamak, an acronym for zinc,
aluminum, magnesium and copper.
This group of alloys include Nos.
2, 3, 5, and 7. The other group
of zinc alloys is referred to
as the ZA group. These alloys
contain higher aluminum content
for improved strength and creep
resistance. ZA-8, ZA-12 and ZA-27
comprise this group, with the
numeric designation indicating
the approximate percentage content
of aluminum.
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