Zinc alloy features
Zinc die casting alloys have a low melting point and good fluidity, allowing thin walls and fine surface detail, which suits hardware and decorative parts. The table below gives international standard compositions for common zinc die casting grades, for material selection and specification reference.
| International Standard Compositions of Zinc Die-casting Alloys | ||||||||
| Designation |
No.2(%) |
No.3(%) |
No.4(%) |
No.5(%) |
No.7(%) |
ZA-8(%) |
ZA-12(%) |
ZA-27(%) |
|
Aluminum (Al) |
3.9-4.3 |
3.9-4.3 |
3.9-4.32 |
3.9-4.3 |
3.9-4.3 |
8.2-8.8 |
10.8-11.5 |
25.5-28.0 |
|
Magnesium(Mg) |
0.025-0.05 |
0.025-0.05 |
0.025-0.05 |
0.03-0.06 |
0.010-0.02 |
0.020-0.030 |
0.020-0.030 |
0.012-0.020 |
|
Copper (Cu) |
2.6-2.9 |
0.10max |
0.3-0.4max |
0.75-1.25 |
0.10max |
0.8-1.3 |
0.5-1.2 |
2.0-2.5 |
|
Lead (Pb) |
0.004max |
0.004max |
0.004max |
0.004max |
0.002max |
0.005max |
0.005max |
0.005max |
|
Cadmium (Cd) |
0.003max |
0.003max |
0.003max |
0.003max |
0.002max |
0.005max |
0.005max |
0.005max |
|
Tin (Sn) |
0.002max |
0.002max |
0.002max |
0.002max |
0.001max |
0.002max |
0.002max |
0.002max |
|
Iron (Fe) |
0.075max |
0.075max |
0.075max |
0.075max |
0.075max |
0.065max |
0.065max |
0.072max |
|
Nickel (Ni) |
- |
- |
- |
- |
0.005-0.020 |
- |
- |
- |
|
Zinc (Zn) |
Balance |
Balance |
Balance |
Balance |
Balance |
Balance |
Balance |
Balance |
| Physical Properties of Zinc Alloys | ||||||||
| Designation |
No.2(%) |
No.3(%) |
No.4(%) |
No.5(%) |
No.7(%) |
ZA-8(%) |
ZA-12(%) |
ZA-27(%) |
|
Density(g/cm) |
6.6 |
6.6 |
6.6 |
6.6 |
6.6 |
6.3 |
6.0 |
5.0 |
|
Melting Range(C) |
379-390 |
381-387 |
380-386 |
380-386 |
381-387 |
375-404 |
377-432 |
376-484 |
|
Electrical Conductivity(%IACS) |
25 |
27 |
26-27 |
26 |
27 |
27.7 |
28.3 |
29.7 |
|
Thermal Conductivity(100c,W/m.k) |
104.7 |
113 |
180.9-113.0 |
108.9 |
11.3 |
114.7 |
116.1 |
125.5 |
|
Coefficient of Thermal Expansion |
27.8 |
27.4 |
27.4 |
27.4 |
27.4 |
23.3 |
24.2 |
26.0 |
|
Specific Heat(J/kg.k) |
418.7 |
418.7 |
418.7 |
418.7 |
418.7 |
435.4 |
448.0 |
534.4 |
|
Die Shrinkage(mm/mm) |
0.006 |
0.006 |
0.007 |
0.006 |
0.006 |
0.007 |
0.0075 |
0.008 |
| Mechanical Properties of Zinc Alloys | |||||||||||
| Designation |
No.2(%) |
No.3(%) |
No.4(%) |
No.5(%) |
No.7(%) |
ZA-8(%) |
ZA-12(%) |
ZA-27(%) |
|||
|
Meehanical Properties |
Die Cast |
Die Cast |
Die Cast |
Die Cast |
Die Cast |
Die Cast |
Sand Cast |
Die Cast |
Sand Cast |
Die Cast |
Sand Cast |
|
Ultimate Tensile Strength(Mpa) |
359 |
283 |
317 |
331 |
283 |
372 |
248-276 |
400 |
276-317 |
421 |
400-440 |
|
Impact Strength(J) |
47 |
58 |
61 |
65 |
58 |
42 |
20 |
28 |
25 |
- |
47 |
|
Elongation(%) |
7 |
10 |
7 |
7 |
13 |
6-10 |
1-2 |
4-7 |
1-3 |
1-3 |
3-6 |
|
Hardness(HB) |
100 |
82 |
92 |
91 |
80 |
95-110 |
80-90 |
95-115 |
90-105 |
105-125 |
110-120 |
|
Shear Strength(MPa) |
317 |
214 |
214-262 |
262 |
262 |
275 |
- |
275 |
- |
296 |
255 |
|
Yield Strength(0.2%,MPa) |
- |
- |
221-269 |
- |
- |
290 |
200 |
317 |
207 |
365 |
365 |
|
Fatigue Strength Rotary Bend |
58.6 |
47.6 |
48-57 |
56.5 |
- |
- |
- |
- |
103.5 |
- |
172.5 |
|
Compressive Strength |
641 |
414 |
414-600 |
600 |
600 |
252 |
199 |
252 |
199 |
269 |
227 |
The advantages of zinc alloy die-casting mold
．Products available to higher dimensional accuracy
．Die life of up to more than 20 million times
．Can reduce the proportion of post-processing mechanism
．Suitable for mass production
Features and Benefits of zinc alloy die-casting products
．Excellent mechanical value
．Finished dimensions of high stability and accuracy good ( Up to 0.03 mm )
．With excellent surface quality, to avoid additional surface treatment program
．Thin sections of high tensile strength and excellent
．Low production costs
．Through the hot chamber casting with a high production rate
．Lower investment cost through simple production process
．Frame mode and low cost
．Flexible production speed: low speed, in general, or high-speed production rate is possible
．Excellent anti-corrosion characteristics
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