Hot-rolled steel strip annealing method

Abstract

A method anneals a hot-rolled steel strip contains 1.6 to 5.0 mass % Si for an electrical steel sheet using annealing equipment including a heating zone, a soaking zone, and a cooling zone arranged in this order from the upstream side, a thickness meter and a rapid heating device are arranged on the upstream side of the soaking zone, and the heating temperature of the rapid heating device for the steel strip is determined based on the value of LSD defined by the thickness of the steel strip measured with the thickness meter and the threading speed of the steel strip during annealing as represented by the following Expression (1): LSD=t×LS . . . (1), where t is the thickness (mm) of the steel strip, and LS is the threading speed (m/min) of the steel strip.

Dependencies are inferred from the claim text.