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Casting Temperatures and Flask TemperaturesThe casting temperatures given in the casting grain table are suggested starting temperatures. This results in good casting for most people. You may have to increase or decrease these slightly (not more than 50°F) Flask temperatures vary, depending on the
size of the pieces being cast and how much fine detail they contain. Large
plain pieces require a lower flask temperature, 800°-950°F, while pieces
with fine detail or filigree require higher flask temperatures,
900°-1150°F. Another rule of thumb is flasks used in vacuum/vacuum assist
casting should be 75°-100°F hotter than when casting the same pieces in a
centrifugal machine. |
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Split spruing to reduce "hot spots" and porosity. On the right, the heavier head section calls for a change in sprue placement. |
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14
White Palladium Casting Grain
| Casting Temperatures: Add 100°-150°F to the liquidus temperature Flask Temperature: Large casting require a lower flask temperature of 800°-950°F. Small detailed pieces require a higher flask temperature of about 900°-1150°F. Porosity: Most porosity is caused by overheating the metal or by poorly designed or insufficient spruing. Melting and Casting Problems: G&S Metals is always available to assist you in resolving your casting problems. gs@gsgold.com . |
