Engineering Materials
Points of arrest for iron correspond to

Stages at which further heating does not increase temperature for some time
There is nothing like points of arrest
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature

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Engineering Materials
Carbon steel is

Extensively used for making cutting tools
An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Refined from cast iron
Made by adding carbon in steel

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