Bronze ingots are delivered to the foundry in the shape of brick which weigh upwards of 20 lbs. each. When a job is ready to run the ingots are placed in one of our electric furnaces and melted for pouring.
Most bronze alloys that Keystone pours melt at a temperature of around 2350° F. Once melted, the metal is poured at a temperature of between 2000°F and 2200°F depending on the wall thickness of the casting. Low lead alloys are a little different. Their melting temperature is slightly less, around 2250° F and then they are poured between 2100° F and 2175° F. Pouring temperature is critical for insuring a pressure tight casting.
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