Grain oriented electrical steel sheet and manufacturing method of same

Abstract

A method for manufacturing a grain oriented electrical steel sheet according to an exemplary embodiment of the present invention includes manufacturing a hot-rolled steel sheet by hot rolling a slab; subjecting the hot-rolled steel sheet to hot-rolled steel sheet annealing; subjecting the hot-rolled steel sheet annealed hot-rolled steel sheet to primary cold rolling; subjecting the primarily cold-rolled steel sheet to primary decarburization annealing; subjecting the decarburization-annealed steel sheet to secondary cold rolling; subjecting the secondarily cold-rolled steel sheet to secondary decarburization annealing; subjecting the secondarily decarburization-annealed steel sheet to primary non-oxidizing annealing of annealing the steel sheet at a temperature ranging from 1000° C. to 1200° C. and a dew point temperature of −20° C. or lower; subjecting the primarily non-oxidizing annealed steel sheet to tertiary cold rolling; and subjecting the tertiarily cold-rolled steel sheet to secondary non-oxidizing annealing of annealing the steel sheet at a soaking temperature ranging from 800° C. to 1000° C. for 30 seconds to 5 minutes.

Dependencies are inferred from the claim text.