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Technical Assistance:
Semco has an extensive tehnical library to assist customers in solving technical problems in all facets of business...
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Price Risk Managment:
Semco realizes that to protect from price volatility, they need to protect their customers' risk exposure. This is why Semco uses real time pricing...
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Remelt:
Semco will take the zinc die cast parks and dross in an ingot form, remelt the material and cast it back into an ignot with proper chemical specifications...
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Die Cast Alloys
Semco Enterprises, Inc. manufacturers the range of ZAMAK and ZA alloys. The most common zinc alloy, ZAMAK 3, satisfies most die casting needs with it's high strength, hardness and low melting point. The other ZAMAK alloys: ZAMAK 2, ZAMAK 5, and ZAMAK 7; have a similar range of Aluminum but differ with their Magnesium and Copper ranges thus resulting in different mechanical and physical properties.
The majority of die cast alloys are produced by pressure die casting. There are two techniques for pressure die casting; hot and cold chamber. Hot chamber die casting is primarily used for ZAMAK and ZA8 alloys, because of the low melting points. It produces at a high production rate even with intrigue casts. Cold chamber casting is used for Zinc alloys that have higher melting points. The metal must be ladled into an injection cylinder thus the production rates are less.
Photo: ZA 3 Ingots on alloy feet.
| Chemical Specification (per ASTM B240-07) for ZAMAK Alloys |
| |
#3 |
#2 |
#5 |
#7 |
| Aluminum (Al) |
3.9 - 4.3 |
3.9 - 4.3 |
3.9 - 4.3 |
3.9 - 4.3 |
| Copper (Cu) |
0.10 Max |
2.67- 3.3 |
0.7 - 1.1 |
0.10 Max |
| Magnesium (Mg) |
0.03 - 0.06 |
0.025 - 0.050 |
0.030 - 0.060 |
0.010 - 0.020 |
| Lead (Pb) |
0.004 Max |
0.004 Max |
0.004 Max |
0.003 Max |
| Tin (Sn) |
0.0015 Max |
0.0015 Max |
0.0015 Max |
0.001 Max |
| Cadmium (Cd) |
0.003 Max |
0.003 Max |
0.003 Max |
0.002 Max |
| Iron (Fe) |
0.035 Max |
0.035 Max |
0.035 Max |
0.075 Max |
| Zinc (Zn) |
Balance |
Balance |
Balance |
Balance |
| Chemical Specification (per ASTM B240-07) for ZA Alloys |
| |
ZA-8 |
ZA-12 |
ZA-27 |
| Aluminum (Al) |
8.2 - 8.8 |
10.8 - 11.5 |
25.5 - 28.0 |
| Copper (Cu) |
0.90 - 1.3 |
0.5 - 1.2 |
2.0 - 2.5 |
| Magnesium (Mg) |
0.020 - 0.030 |
0.020 - 0.030 |
0.012 - 0.020 |
| Lead (Pb) |
0.005 Max |
0.005 Max |
0.005 Max |
| Tin (Sn) |
0.002 Max |
0.002 Max |
0.002 Max |
| Cadmium (Cd) |
0.005 Max |
0.005 Max |
0.005 Max |
| Iron (Fe) |
0.035 Max |
0.05 Max |
0.07 Max |
| Zinc (Zn) |
Balance |
Balance |
Balance |
| Mechanical Properties |
| Alloy Property |
|
#3 |
#2 |
#5 |
#7 |
ZA-8 |
ZA-12 |
ZA-27 |
| Ultimate Tensile Strength |
psi x 103
(Mpa) |
41
(283) |
52
(359) |
48
(331) |
41
(283) |
54
(372) |
59
(404) |
62
(426) |
| Yield Strendth 0.2% Offset |
psi x 103
(Mpa) |
32
(221) |
NA
|
33
(228) |
NA
|
42
(290) |
46
(320) |
54
(371) |
| Elongation (% in 2") |
|
10 |
7 |
7 |
13 |
8 |
5 |
2.5 |
| Shear Strength |
psi x 103
(Mpa) |
31
(214) |
46
(317) |
38
(262) |
31
(214) |
40
(275) |
43
(296) |
47
(325) |
| Hardness (Brinell) |
|
82 |
100 |
91 |
80 |
103 |
100 |
119 |
| Impact Strength |
ft-lb
(J) |
432
(58) |
352
(47) |
482
(65) |
432
(58) |
312
(42) |
212
(29) |
92
(13) |
| Fatigue Strength Rotory Bend (% x 108 cycles) |
psi x 103
(Mpa) |
6.9
(47.6) |
8.5
(58.6) |
8.2
(56.5) |
6.8
(46.9) |
15
(103) |
17
(117) |
21
(145) |
| Compressice Yield Strength 0.1% Offset |
psi x 103
(Mpa) |
606
(414) |
936
(641) |
876
(600) |
606
(414) |
37
(252) |
39
(269) |
52
(359) |
| Physical Properties |
| Alloy Property |
|
#3 |
#2 |
#5 |
#7 |
ZA-8 |
ZA-12 |
ZA-27 |
| Density |
lb/in3
(Kg/m3) |
0.24
(6600) |
0.24
(6600) |
0.24
(6700) |
0.24
(6600) |
0.227
(6300) |
0.218
(6030) |
0.181
(5000) |
| Melting Range |
Fo
Co |
718 - 728
381 - 387 |
715 - 734
379 - 390 |
717 - 727
380 - 386 |
718 - 728
381 - 387 |
707 - 759
375 - 404 |
710 - 810
377 - 432 |
708 - 903
376 - 484 |
| Electrical Conductivity |
% IACS |
27 |
25 |
26 |
27 |
27.7 |
28.3 |
29.7 |
| Thermal Conductivity |
Btu/ft-hr Fo
(W/m K) |
65.3
(113) |
60.5
(105) |
62.9
(109) |
65.3
(113) |
66.3
(115) |
67.1
(116) |
72.5
(126) |
| Pattern Shrinkage |
in/in or m/m |
0.006 |
0.006 |
0.006 |
0.006 |
0.007 |
0.0075 |
0.008 |
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