Furnace temperature determination method of continuous heat treatment furnace

摘要

PROBLEM TO BE SOLVED: To determine furnace temperature that can reduce the variation in strength occurred in a steel plate and can increase the productivity of a heat treating furnace, in the heat treatment of a steel plate in which the steel plate is continuously drawn at a temperature lower than a preset furnace temperature.;SOLUTION: The method for determining the furnace temperature of the heat treating furnace in which a steel plate is continuously heat-treated includes the steps of: (i-1) determining the range of the heat treatment temperature which falls within the range of the variation in strength acceptable to the steel plate (the temperature difference which is acceptable in the heat treatment operation); (i-2) determining the maximum value of preset furnace temperature in which the temperature difference actually produced in the steel plate does not exceed the range of the heat treatment temperature; (ii-1) determining the maximum in-furnace time in which the steel plate can stay in the heat treating furnace from a target heat treatment capability; (ii-2) determining the minimum value of the preset furnace temperature which is set to a target drawing temperature of the steel plate from the determined maximum in-furnace time; and (iii) determining the furnace temperature of the heat treating furnace between the maximum value and the minimum value of the determined preset furnace temperature, from the viewpoint of reduction of the variation in strength occurred in the steel plate and improvement in the productivity of the heat treating furnace.;COPYRIGHT: (C)2012,JPO&INPIT