Continuous annealing line, continuous annealing method, method of producing cold-rolled steel sheet, and method of producing coated or plated steel sheet

Abstract

Provided are a continuous annealing line, a continuous annealing method, a method of producing a cold-rolled steel sheet, and a method of producing a coated or plated steel sheet that precisely predict a phase fraction of a steel sheet under a high temperature condition and rapidly adjust an annealing condition to reflect a predicted phase fraction variation. The continuous annealing line is for a steel sheet and includes a heating zone (6), a soaking zone (7), and a cooling zone (8), in this order, at least one induction heating device (9) disposed between the soaking zone (7) and the cooling zone (8), and a control device that sets operating conditions of the induction heating device based on a phase fraction during annealing obtained by a phase fraction prediction model.

Dependencies are inferred from the claim text.