Engineering Materials
Sulphur in cast iron

Aids fusibility and fluidity
Makes the iron soft and easily machinable
Make the iron white and hard
Increases hardness and brittleness

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Engineering Materials
Recrystallization temperature is one

At which crystals first start forming from molten metal when it is cooled
At which change of allotropic form takes place
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which crystals grow bigger in size

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Silicon and manganese has burnt and carbon has started oxidizing
Air is burning out silicon and manganese
The brown smoke does not occur during the operation of a Bessemer converter
The converter must be titled to remove the contents of the converter

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