Engineering Materials
A material is known as allotropic or polymorphic if it

Exists in several crystal forms at different temperatures
Has a fixed structure under all conditions
Responds to heat treatment
Has its atoms distributed in a random pattern

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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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