METHOD FOR MANUFACTURING GRAIN-ORIENTED SILICON STEEL SHEET

摘要

A method for obtaining grain-oriented silicon steel sheet with a very high magnetic flux density and a very low core loss by setting specific conditions for the decarburization and primary recrystallization annealing step within the series of steps performed for the manufacture of the grain-oriented silicon steel sheet. This method consists of setting the rate of temperature rise in the decarburization and primary recrystallization annealing step at no less than 10 DEG C./sec, dividing the decarburization and primary recrystallization annealing step into a first half and a second half, and restricting the temperature, time, and ratio PH2O/PH2 of the partial pressure of H2O to the partial pressure of H2 of the atmosphere for each of these two halves within certain predefined ranges.