HOT-ROLLED STEEL SHEET MANUFACTURING METHOD CAPABLE OF IMPROVING ACCURACY IN PREDICTING TEMPERATURE IN A HOT-FINISH ROLLING SECTION

摘要

PURPOSE: A hot-rolled steel sheet manufacturing method capable of improving accuracy in predicting temperature in a hot finish rolling section is provided to calibrate the heat transfer learning coefficient of a corresponding material with reflecting the heat transfer learning coefficients of a previous material and an existing material.;CONSTITUTION: A hot-rolled steel sheet manufacturing method capable of improving accuracy in predicting temperature in a hot-finish rolling section includes: a first temperature measuring step (S10) of measuring temperature at the outlet of a rough rolling section; a first temperature calculating step (S20) of calculating temperature at the inlet of a finish rolling section using the measured temperature at the outlet of the rough rolling section and a prepared model equation; a second temperature calculating step (S30) of calculating temperature at the inlet of each stand in the finish rolling section and temperature at the outlet of the finish rolling section using the calculated temperature at the inlet of the finish rolling section and a previously calculated and stored heat transfer coefficient; a second temperature measuring step (S40) of measuring the temperature at the inlet and the outlet of the finish rolling section; a previous material heat transfer learning coefficient deriving step (S50) of searching the previously stored heat transfer learning coefficient of a previous material which is a material identical with a corresponding material and is rolled in a condition identical with a rolling condition for the corresponding material; and an existing material heat transfer learning coefficient deriving step (S60) of searching the previously stored heat transfer learning coefficient of an existing material which is the material identical with the corresponding material or is rolled in the condition identical with the rolling condition for the corresponding material.;COPYRIGHT KIPO 2013;[Reference numerals] (S10) First temperature measuring step; (S20) First temperature calculating step; (S30) Second temperature calculating step; (S40) Second temperature measuring step; (S50) Previous material heat transfer learning coefficient deriving step; (S60) Existing material heat transfer learning coefficient deriving step; (S70) Heat transfer learning coefficient calibration step; α_i_+_1 =α_i ×ø+α _i_-_1× (1-ø); (S80) Heat transfer coefficient calibration step; The calibration Heat transfer coefficient of a material = the calculated calibration Heat transfer coefficient of a material × (1+α_i_+_1); (S90) Roll gap setting step