MANUFACTURING – CATING & FOUNDRY CALCULATOR
Metal Pour Temperature
A precise tool.
What is the Metal Pour Temperature & How does it work?
In casting, the metal must be poured at a temperature above its liquidus point to compensate for heat loss during transfer and to ensure complete mold filling. This excess temperature is called superheat and is typically expressed in degrees Celsius above the alloy’s melting temperature.
The required superheat varies with alloy composition, mold material, and casting geometry. Too little superheat can cause premature solidification, leading to defects such as cold shuts or misruns. Excessive superheat, however, can increase oxidation, promote gas entrapment, and waste energy.
Accurately calculating the pour temperature helps foundries balance these factors. By adding the desired superheat to the known melting point of the selected alloy, engineers can set the furnace temperature to achieve optimal flow and solidification characteristics.
T_{pour}=T_{melt}+\Delta T_{superheat}
\Delta T_{superheat} = desired temperature increase above the alloy’s melting point (°C)
Parameters
Result
—
Frequently Asked Questions
What is superheat in metal pouring?
Superheat is the extra temperature added to molten metal above its liquidus point to compensate for heat loss and ensure complete mold filling.
How does superheat affect casting quality?
Proper superheat prevents premature solidification, reducing defects like cold shuts or misruns in castings.
What factors determine the required superheat?
Superheat depends on alloy composition, mold material, and casting geometry to ensure optimal filling and cooling.
Can too much superheat be harmful?
Excessive superheat can lead to porosity or other defects in the final casting due to rapid cooling.
How do I calculate the metal pour temperature?
Add the required superheat to the alloy’s liquidus temperature to determine the pouring temperature.
What are some common alloys used in casting?
Common casting alloys include aluminum, bronze, brass, and steel, each with specific melting points and superheat requirements.
Why is mold material important for superheat calculation?
Different molds conduct heat at varying rates, affecting how much superheat is needed to maintain the metal’s liquid state during pouring.
Results are for informational purposes only and do not constitute professional advice.