Issue 37

U. Muhin et alii, Frattura ed Integrità Strutturale, 37 (2016) 305-311; DOI: 10.3221/IGF-ESIS.37.40 305 Focused on Fracture Mechanics in Central and East Europe Simulation of accelerated strip cooling on the hot rolling mill run-out roller table U. Muhin, S. Belskij, E.Makarov Lipetsk State Technical University, Lipetsk, Russia T. Koynov University of Chemical Technology and Metallurgy, Sofia, Bulgaria A BSTRACT . A mathematical model of the thermal state of the metal in the run-out roller table continuous wide hot strip mill. The mathematical model takes into account heat generation due to the polymorphic γ → α transformation of supercooled austenite phase state and the influence of the chemical composition of the steel on the physical properties of the metal. The model allows calculation of modes of accelerated cooling strips on run-out roller table continuous wide hot strip mill. Winding temperature calculation error does not exceed 20°C for 98.5 % of strips of low-carbon and low-alloy steels K EYWORDS . Hot Rolled; Wide-strip; Accelerated Cooling; Run-out Roller Table; Polymorphic Transformation; Mathematical Modeling. I NTRODUCTION n a highly competitive market, each steel group strives to improve product quality. The most important factor affecting the quality of products, ensuring accuracy is a necessary process parameter throughout the production cycle. When thermomechanical processing of metals in the hot rolling mill main controllable parameters are the temperature of the end of the rolling and winding, the thickness, width, profile and flatness of the strip. At the present time to provide the necessary parameters in a narrow permitted range is not possible without automation of the production process. In this regard, the development of mathematical models, based on which is more precise control of process parameters is an urgent task. M ATEMATICAL MODEL OF THE THERMAL STATE OF THE METAL IN THE COLLECTING ROLLER TABLE urrently, broadband hot rolling mills for rapid cooling strips on collecting roller table used as a rule, the collector jet (laminar) cooling. When you turn on the system of forced cooling of the heat exchange with the band by exhausting heat out of the jets of water coming from the upper and lower reservoirs, the layer of water flowing I C