Microalloyed or HSLA (high strength low-alloy) steels have high mechanical characteristics; this means an advantage over common alloy steels, as high strength parts can be obtained by forging, without having to resort to further processing.
The precipitates that form and the temperature control (cooling process) are the two phenomena that confer the high mechanical characteristics to these steels.
Elements such as Niobium, Vanadium, Aluminium or Titanium are most commonly used for microalloy.