Engineering Materials
Delta iron occurs at temperature of

Between 910°C and 1400°C
Room temperature
Between 1400°C and 1539°C
Above melting point

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

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

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