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Basic characteristics and application examples of the mathematical simulator for reheating process in walking-beam\udtype furnaces, that has been developed and applied to Usiminas plate mill line at Ipatinga, are shown in this paper. This\udis a bi-dimensional mathematical model solved by the finite volume method, validated by temperature measurements\udinside the slab during heating and coded as a visual tool. Among these applications, the following can be highlighted:\ud(i) determination of suitable furnace zone temperatures and residence times for processing steels by accelerated cooling\udtechnology; (ii) determination of slab average temperature at discharging as well as at each zone exit, supplying data to\udbe fed to the automation system at the comissioning stage; (iii) analyses of slab thermal distribution through the reheating\udprocess, enabling operational optimizatio

MELHORIA DO PROCESSO DE REAQUECIMENTO DE PLACAS NA USIMINAS POR MEIO DE SIMULAÇÃO MATEMÁTICA