Design and research of heat recovery shield at hot rolling mill in steel industry

Abstract

This paper presents the heat transfer analysis of hot rolling bar (HRB), exactly between roughing mill and steckel mill. The bar is heated up to 1250°C in the furnace for three hours. The hot bar stock enters the roughing mill. Here, the bar stocks are fed for seven passes and the thickness is reduced to 25 mm. The elongate hot bar then travels approximately 126m in the open air surrounding over roller before entering the steckel mill. Transfer bar is rolled in steckel mill in 3 to 7 passes to achieve required thickness. It is adopted with the most sophisticated rolling technology of level-2 automation to achieve the target thickness, profile and flatness. There is a considerable loss of heat during this travel due to convection and radiation. This has been identified as the place, where the objective is to minimize heat loss taking place. Catia V5 is used for modeling and Ansys Workbench is used for thermal analysis.