Engineering Materials
Dow metal contains

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% aluminium and 90% copper
90% magnesium and 9% aluminium with some copper

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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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