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
Cyaniding is the process of

Reacting steel surface with cyanide salts
Obtaining cyanide salts
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Dipping steel in cyanide bath

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