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
Air is burning out silicon and manganese
The converter must be titled to remove the contents of the converter
Silicon and manganese has burnt and carbon has started oxidizing

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Engineering Materials
Carbon steel is

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

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