METHOD FOR CONTROLLING COILING TEMPERATURE OF HOT ROLLED STEEL STRIP

摘要

PURPOSE:To fix the cooling speed of a hot rolled strip. CONSTITUTION:To a finish-rolled steel strip, as the finishing outlet temperature 2 is measured at every fixed length from a time when the finishing outlet temperature is detected, regarding a coil piece of every fixed length which already has passed a thermometer 2 at the finishing outlet, the fall of temperature is obtained based on actual results 16 on-off of a water injection valve of a bank through which this coil piece passes to calculate the present temperature of the coil piece. The target temperature at the outlet of each bank is determined 14 so that the cooling speed of this coil piece becomes constant to a certain bank from that passing time as far as the strip advances the next fixed length and a number of valves satisfying this target temperature is determined to every bank and set for cooling.