This paper deals with optimization of roll cooling during hot rolling of tubes in stretch reducing mill (SRW) in Železiarne Podbrezová. Temperature of the tube after rolling in SRW should be higher than Ar3 as much as 30 - 50 °C. Current practice in SRW cooling system in Železiarne Podbrezová utilizes nozzles A with nominal flow rate of 10 l/min. These nozzles cannot maintain stable spray cone for lower flow rates that are necessary to pass the Ar3 rolling temperature limits. Prospective nozzles B with nominal flow rate of 5 l/min were tested and evaluated. Although the highest possible rolling temperature is of primary importance here, overheating of the rolls should be avoided at all costs. All our experiments were carried out with single temperature of the furnace in which hollows are preheated prior to rolling. Surface temperature of the rolls was measured by means of K-thermocouple contact measurement system.Keywords: Seamless steel tubes, stretch reducing mill, roll temperature, roll cooling
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