Which type of furnace is commonly used for melting cast iron?
Analysis & Theory
Cupola furnaces are traditionally used for melting cast iron due to their continuous melting ability.
What is the typical melting temperature range of cast iron?
Analysis & Theory
Cast iron typically melts in the range of 1150°C to 1300°C.
In the cupola furnace, what fuel is primarily used to melt cast iron?
Analysis & Theory
Coke is the primary fuel in a cupola furnace, providing the heat for melting.
What role does flux (like limestone) play in cast iron melting?
C
Removes impurities as slag
Analysis & Theory
Flux binds with impurities to form slag, helping to purify the molten iron.
Which furnace type provides the **cleanest melting environment** for cast iron?
Analysis & Theory
Induction furnaces provide a clean, controlled environment and precise temperature control.
Why is temperature control critical during cast iron melting?
A
To avoid burning the furnace
C
To prevent oxidation and composition loss
Analysis & Theory
Incorrect temperature can cause oxidation, change in composition, and poor casting quality.
Which gas is a by-product during the melting of cast iron in cupola furnaces?
Analysis & Theory
Carbon monoxide is generated during coke combustion in the cupola.
What is the function of the slag hole in a cupola furnace?
Analysis & Theory
The slag hole is used to remove the molten slag (impurities) formed during melting.
Which of the following is a disadvantage of cupola furnaces?
B
Poor temperature control
Analysis & Theory
Cupola furnaces lack precise temperature control compared to electric furnaces.
During melting, what can be added to adjust the composition of cast iron?
Analysis & Theory
Alloying elements like silicon or manganese may be added to modify cast iron properties.