Engineering Materials
Carbon steel is

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

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Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which crystals grow bigger in size
At which crystals first start forming from molten metal when it is cooled
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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