PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET WITH LESS SIDE DISTORTION

PROBLEM TO BE SOLVED: To advantageously evade the generation of distortion in the lower end part of a coil feared in high temp. finish annealing executed in a state of being coiled round a coil in the method for producing a grain oriented silicon steel sheet composed of a series of process in which a silicon-contg. steel slab is subjected to hot rolling, is thereafter subjected to cold rolling for one time or >= two times including process annealing, is next subjected to decarburizing annealing, is subsequently coated with a separation agent for annealing essentially consisting of MgO and is then subjected to finish annealing in a box-type annealing furnace. SOLUTION: Prior to finish annealing, the end part of a coil on the side in contact with a coil receiving stand in a box-type annealing furnace is applied with local distortion, and the coil end part is subjected to secondary recrystallization by finish annealing at a simultaneous time for the center part in the width direction of the coil or at an earlier time than that. This distortion is effective even only for the region equivalent to the outer circumferential part of the coil.