ANNEALING SEPARATING AGENT COMPOSITION FOR GRAIN ORIENTED ELECTRICAL STEEL SHEET METHOD FOR MANUFACTURING MAGNESIUM OXIDE FOR ANNEALING SEPARATING AGENT AND METHOD FOR MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET

摘要

The annealing separator composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention includes magnesium oxide, and the hydration water slope of magnesium oxide represented by the following Formula 1 is 0.28 to 0.50. [Equation 1] [Hydration Moisture Gradient] = ([Ig.loss2]-[Ig.loss1]) / ([T2]-[T1]) (In Formula 1, [Ig.loss1] and [Ig.loss2] are the weight loss rate (% by weight) of magnesium oxide when the hydrated magnesium oxide is raised to the temperature of [T1] and [T2], respectively, [T1] and [T2] is the temperature (° C.) selected at 550 to 1000 ° C. respectively. [T1] and [T2] are different from each other.)