Hot rolling is a mill process which involves rolling the steel at a high temperature (typically at a temperature over 1700° F), which is above the steel’s recrystallization temperature. When steel is above the recrystallization temperature, it can be shaped, formed and the steel can be made in much larger sizes. Hot rolled products like hot rolled steel bars are used in the welding and construction trades to make big steel structures with high endurance and  I-beams.