Steel is an iron-based alloy with small additions of carbon and other
elements that impart improvements in various properties. Steel is among the
most useful of metals. It is the metal that has the highest strength per unit
cost. There are a wide range of steel compositions as well as a wide range of
micro structures that can be produced. These ranges allow a large choice of
properties to be achieved within the steel-alloy family. At low temperatures,
the micro structure of steel is often in the fer-rite plus iron-carbide phase
field, whereas at high temperatures, the micro structure of steel is in the
Austen phase field.
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