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

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

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Engineering Materials
Carbon steel is

Extensively used for making cutting tools
Refined from cast iron
Made by adding carbon in steel
An alloy of iron and carbon with varying quantities of phosphorus and sulphur

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