Overview of Zinc Casting Alloys
Comparison Table of Casting Characteristics of Major Zinc Casting Alloys
|
|
ZA3 |
ZA8 |
ZA12 |
ZA27 |
|
Tensile Strength (N/mm2) |
283 |
220-255 |
276-310 |
400-440 |
|
Elongation (%) |
15 |
1-2 |
3-4 |
3-6 |
|
Brinell Hardness |
83 |
85-90 |
105-125 |
110-120 |
|
Density (g/cm3) |
6.7 |
6.3 |
6.03 |
5.0 |
|
Freezing range (°C approx.) |
387-382 |
404-375 |
430-380 |
490-380 |
|
Thermal Con (cal/cm2/cm/°C @ 25°C) |
0.27 |
(115) |
0.21 |
(112.5) |
|
Electrical Con (% copper std. @ 20°C) |
26 |
27.7 |
25 |
28 |
|
Machinability |
E |
E |
E |
E |
|
Corrosion Resistance |
E |
E |
E |
E |
|
Electro Plating Suitability |
E |
G |
G |
F |
|
Non Spark |
Yes |
Yes |
Yes |
No |
|
Casting Characteristics - Sand |
G |
E |
E |
E |
|
Casting Characteristics - Gravity |
G |
E |
E |
G |
|
Casting Characteristics - High Pressure |
E |
F |
F |
F |
|
Material Cost (£/kg - Dec 2011) |
£1.84 |
£1.85 |
£1.93 |
£1.97 |
E = Excellent
G = Good
F = Fair
P = Poor
U = Unsuitable
Notes for Designers of Non-Ferrous Castings
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