Engineering Materials
The hardness of steel primarily depends on

Shape of carbides and their distribution in iron
Heat treatment employed
Percentage of alloying elements
Percentage of carbon

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

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
Silicon and manganese has burnt and carbon has started oxidizing

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