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Through calculating the temperature field of billet in the process of reheating furnace, direct rolling and direct rolling with insulating cover, the temperature uniformity of billet obtained by different processes before starting rolling had been analysed. And then the mechanical properties and microstructure of hot rolled rebars in different positions of each process had been examined. The conclusions are as follows: The temperature uniformity of billet before rough rolling can be effectively increased by adding insulation covers in the conveying process of billet. With the decrease of temperature difference between the head and tail of billet, the fluctuation range of mechanical properties of production is narrowed. The process can obviously reduce the difference of grain size between the head and the tail of billet.

Influence of Temperature Uniformity of Billet before Rolling on Microstructure and Properties of Hot Rolled Rebar