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
Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property
Improves cutting ability and reduce hardenability
Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
Improves wear resistance, cutting ability and toughness

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Engineering Materials
Inconel contains

65% nickel, 15% chromium and 20% iron
80% nickel and 20% chromium
68% nickel, 29% copper and 3% other constituents
80% nickel, 14% chromium and 6% iron

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