METHOD TO PRODUCE GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING HIGH MAGNETIC FLUX DENSITY

摘要

PURPOSE: Provided is a method to produce a grain-oriented electrical steel sheet having crystal grains whose orientations are aligned. The grain-oriented electrical steel sheet is used as a soft magnetic material for the cores of electrical equipment such as transformers. CONSTITUTION: The method to produce a grain-oriented electrical steel sheet, proposes conditions for stable production by clarifying the causes by which secondary recrystallization is rendered unstable when primary recrystallization is controlled by raising the heating rate of decarburization annealing. The primary recrystallization structure is controlled by changing the heating rate and the oxide layer of a steel sheet is controlled by changing the conditions of soaking annealing in the decarburization annealing. The composition of the (Al, Si)N inhibitor is also controlled in the nitriding treatment thereafter.