Alloy steels have properties due to elements other than carbon.
An Alloy Steel is a steel with properties due to elements other than carbon like nickel, copper, chromium, and/or aluminum. These additional elements are used to influence the metal’s strength, ductility, corrosion resistance, and machinability.
The content of alloying elements exceeds one or more of the limits:
manganese > 1.65%
silicon > 0.60%
copper > 0.60%
In addition a definite range or a minimum quantity of