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Die casting material:Zin Alloys

2022.04.20  Share Page +

The element zinc, with a specific gravity of 7.0, is among the heavier of the common structural metals. It is somewhat less dense than iron (7.7) and copper (9.0). When used as a base for die casting alloys, zinc is alloyed with aluminum, copper and magnesium as the Zamak (an acronym for zinc, aluminum, magnesium and copper) alloys. These alloys, with their ASTM designations, are:
• Zinc 2 ASTM AC43A
• Zinc 3 ASTM AG40A
• Zinc 5 ASTM AC41A
• Zinc 7 ASTM AG40B
The nominal aluminum content of each alloy is 4%. Aluminum improves the alloy’s  mechanical properties, particularly tensile and impact strengths. The relatively low
concentration gives the alloys very low melting points and makes them easy to cast.Copper, in small amounts, increases tensile strength and hardness, but reduces ductility,particularly in the aged condition. Zinc 2 and 5 have nominal copper contents of 3% and 1% respectively. Copper is restricted to a maximum of 0.25% in zinc 3 and 7. Magnesium,in very small amounts, also increases hardness and reduces ductility. Its main purpose is to offset the effects of metallic impurities, particularly cadmium, lead and tin. Iron, cadmium, lead and tin have been identified as undesirable elements and are restricted to low or extremely low levels. Higher iron contents form undesirable intermetallic particles. Cadmium, lead and tin, even in very low concentrations, can cause intergranular corrosion in the zinc-aluminum alloy system when magnesium is absent.

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