Engineering Materials
Combined carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure
Hard and gives a fine grained crystalline structure

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Engineering Materials
Tungsten in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability
Gives ductility, toughness, tensile strength and anti-corrosion properties

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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 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

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