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 |