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What is the composition of Cast Iron ?
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Answer Posted / nishanth
Carbon (up to 4%): The carbon content of the grey cast
iron later on gets converted to graphite after going through
a series of chemical reactions. This graphite content is
responsible for providing strength and easy machinability
feature to the Grey Cast Iron.
Silicon (up to 3%): Silicon is mainly added for the
de-oxidation process so that the carbon content added does
not get oxidized to the iron carbides. Silicon acts as the
stabilizing element for the graphite in the Grey Cast Iron.
Manganese (0.8%): Manganese acts as a stabilizing
element that ensures that the Grey Cast Iron delivers high
performance even at high temperatures. This property
increases the toughening of the overall structure.
Sulfur (0.07%): It acts as a stabilizing element for
manganese and improves the toughness of the Grey Cast Iron
at high temperatures.
Phosphorus (0.2%): Phosphorous has to be added in small
amounts to improve the fluidity, corrosion resistance and
the toughness of the Grey Cast Iron. Phosphorous, when added
in large amount, reduces the overall strength of the Grey
Cast Iron.
Molybdenum (up to 0.75%): Molybdenum improves the
strength and elasticity of the Grey Cast Iron when added in
small amounts.
Chromium (0.35%): Chromium improves the temperature
range and hardness of Grey Cast Iron.
Vanadium (0.15 %): Vanadium improves the wear and tear
resistance.
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