Deformation schedule (temperature, strain and strain rate) is designed as per the  tensile properties of steel. For example, high strength steel requires fine structure, whereas soft steel or low yield strength steel requires coarse structure. Keeping this in view, entire deformation is dived i to two phases, i.e. roughing phase and finishing phase which is divided based on the no-recrystallization temperature. Primary objective of roughing phase is to impart maximum reduction taking advantage of  high temperature and low flow stress and carry out austenite conditioning through static/ dynamic recrystallization before it undergoes finishing reduction. During finishing passes below no-recrystallization, strain accumulation takes places helping in ferrite grain refinement.

Following should be taken into account for deciding deformation temperature of microalloyed steel:

- Chemical composition (C, Mn, Si, Nb, Ti, V)

Alloying changes the transformation temperature and no-recrystallization temperature

- Mill condition

This is related to mill load. Older mill, generally, have lower load capacity as compared to newer high load capacity. This restricts the amount of reduction or rolling at lower temperature.

Availability and capacity of accelerated cooling also plays an important role.

- Final mechanical properties

As stated above, mechanical properties of the final product always plays a major role in deciding the deformation schedule.

- Possibility and nature of softening mechanism like static/ dynamic recrystallization or recovery

It is note that the entire reduction has to be judiciously divided into roughing and finishing passes as per above. 

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