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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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Mold Base Alloys
Semco manufactures Kirksite Alloy. The alloy has moderate strength and good abrasion resistance due to it's self-lubricating properties, but limited life. Kirksite is for gravity casting of tools and tool applications, plastic injection and molding inserts.
| Chemical Specification (per ASTM B240-07) |
| |
Kirksite |
| Aluminum (Al) |
3.9 - 4.3 |
| Copper (Cu) |
2.67- 3.3 |
| Magnesium (Mg) |
0.025 - 0.050 |
| Lead (Pb) |
0.004 Max |
| Tin (Sn) |
0.0015 Max |
| Cadmium (Cd) |
0.003 Max |
| Iron (Fe) |
0.035 Max |
| Zinc (Zn) |
Balance |
| Mechanical Properties |
| Alloy Property |
|
Kirksite |
| Ultimate Tensile Strength |
psi x 103
(Mpa) |
52
(359) |
| Yield Strendth 0.2% Offset |
psi x 103
(Mpa) |
NA
|
| Elongation (% in 2") |
|
7 |
| Shear Strength |
psi x 103
(Mpa) |
46
(317) |
| Hardness (Brinell) |
|
100 |
| Impact Strength |
ft-lb
(J) |
352
(47) |
| Fatigue Strength Rotory Bend (% x 108 cycles) |
psi x 103
(Mpa) |
8.5
(58.6) |
| Compressice Yield Strength 0.1% Offset |
psi x 103
(Mpa) |
936
(641) |
| Physical Properties |
| Alloy Property |
|
Kirksite |
| Density |
lb/in3
(Kg/m3) |
0.24
(6600) |
| Melting Range |
Fo
Co |
715 - 734
379 - 390 |
| Electrical Conductivity |
% IACS |
25 |
| Thermal Conductivity |
Btu/ft-hr Fo
(W/m K) |
60.5
(105) |
| Pattern Shrinkage |
in/in or m/m |
0.006 |
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