**1. Microstructural evolution during themomechanical processing of steel**

#### **1.1 Thermomechanical processing in hot rolling mill**

Thermomechanical processing in hot rolling mill in general involves rolling of slabs or blooms to thinner sections which are classified as plate or coils by inducing reduction in thickness by rolling at controlled elevated temperatures to achieve desired mechanical properties.

As shown in **Figure 1**, typical thermomechanical hot rolling process can be divided into five basic processes.

**Figure 1.** *Typical setup of hot strip rolling mill.*
