METHOD FOR CONTROL OF COOLING OF STEEL PLATE

摘要

A method for controlling cooling of a steel sheet characterized by controlling the end-of-cooling temperature in a cooling process from the Ae 3 or above temperature of the steel sheet, during which; preliminarily obtaining enthalpies (H³ and H±) of an austenite phase and ferrite phase respectively at some temperatures, obtaining a dynamic enthalpy (Hsys) defined by formula (1) with an untransformed fraction (X³) of austenite in accordance with a target temperature pattern, predicting the temperature by using a gradient of this dynamic enthalpy with respect to temperature as a dynamic specific heat and controlling the cooling of the steel sheet: Hsys = H³ X³ + H± �¢ 1 - X³