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Specifications for Architectural Metal Castings
Use of existing castings to create patterns for new castings and new patternwork:
1. Shrinkage: If using existing castings to use as a pattern the shrinkage rate will be 1/8" per linear foot; therefore, the new castings will be smaller than the original.
2. To create new castings, a detailed drawing will need to be forwarded showing draft, section view, dimensions, scale preferred as 1" = 1 foot, quantities required and the preferred alloy.
3. AAM can generate the drawing from a sketch or photo of the original component to be produced.
Cast Alloys:
1. Cast Iron, class 30 gray iron, ASTM A48
2. Ductile Iron, 65-45-12 A-536
3. Cast Aluminum alloy #319, 356, A-356 (virgin alloy)
4. Cast Bronze: Silicone Bronze, Everdur– color can
be altered with alternate alloys
5. Stainless Steel: Alloy #316
Painted Finishes:
1. Aluminum: Primer two component epoxy, followed
by polyurethane enamel.
2. Iron/Steel: Zinc chromate primer, two component
epoxy primer, with top coating of acrylic
polyurethane (color to be determined, or color
match # and mfg.)
3. Antique finish/custom finish, hand rubbed and
wiped dry.
Ferrous Metals Data:
Properties of Cast Iron:
| |
Minimum |
Typical |
Maximum |
| Ultimate Tensile Strength PSI |
20,000 |
25,000 |
30,000 |
| Yield Tensile Strength PSI |
usually not specified, 0.5% |
| Traverse Test Deflection, inch |
.14 |
.17 |
.20 |
| Hardness, Brinell BHN |
170 |
187 |
229 |
Properties of Ductile Iron (as cast):
| |
Minimum |
Typical |
Maximum |
| Ultimate Tensile Strength PSI |
80,000 |
85,000 |
100,000 |
| Yield Tensile Strength PSI |
55,000 |
65,000 |
75,000 |
| Elongation % in 2 |
6.0 |
8.0 |
12.0 |
| Hardness, Brinell BHN |
187 |
217 |
255 |
Properties of Steel Fabrications Cast Products:
| |
Minimum |
Typical |
Maximum |
| Ultimate Tensile Strength PSI |
60,000 |
65,000 |
70,000 |
| Yield Tensile Strength PSI |
30,000 |
35,000 |
38,000 |
| Elongation % in 2 |
28.0 |
33.0 |
36.0 |
| Hardness, Brinell BHN |
120 |
130 |
140 |
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