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Zinc Die Casting Alloy
Most often, though casting design procedures, and alloy ZAMAK- 3 pressure die casting can be made to meet service or functional requirements. When this is not the case, especially where strength is concerned, ZAMAK- 5 is the logical choice. Except for a nominal 1% copper addition, the chemistry of ZAMAK- 5 is comparable to that of ZAMAK- 3. This composition modification results in higher tensile strength and increased hardness, with a sacrifice in elongation. ZAMAK- 5 also has significantly better creep resistance than the other alloys in the conventional group.
Zamak-5 is not as ductile as some of other alloys, a factor to consider when post casting operations are required, Because of the copper content, trim scrap should be segregated.
CHEMISTRY
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Alloying Elements (%)
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Al
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3.9 - 4.3
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Cu
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0.75 - 1.25
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Mg
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0.04 - 0.06
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Impurities
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Fe
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0.100 M
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Cd
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0.002 M
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Sn
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0.002 M
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Pb
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0.003 M
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PHYSICS
- Brinel Hardness : 91
- Compressive Strength (psi) : 87000
- Tensile Strength (psi) : 48000
- Melting Points oC : 405
- Density kg.m3 : 6700
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