How is steel improved by cold working?

Steel improved by cold working:

Cold working is a process in which grains of steel are extended in the elongation direction of steel which is responsible for increasing hardness and strength and the ductility is decreased. More accurate finished products are obtained from this cold working process. No shrinkage occurs because of this cooling. Smooth surface is formed as scale of oxide is not formed which forms in hot working. Overcooling should not be done as it is responsible for causing brittleness.