Method for manufacturing single-oriented electrical steel sheets comprising antimony and having a high magnetic induction

A method of manufacturing single-oriented electrical steel sheet comprising:

• a. hot rolling a silicon steel raw material consisting essentially of less than 0.06% of carbon, less than 4% of silicon, 0.012 to 0.045% of antimony aand 0.008 to 0.10% of at least one member of a group selected from selenium, sulphur and tellurium, and 0.02 to 0.2% of manganese, to an intermediate gauge of about 2-5mm;
• b. effecting at least one cold rolling at a reduction rate of 40-85% so as to form a cold rolled steel sheet having final gauge;
• c. decarburization annealing said sheet in a wet hydrogen atmosphere at 750.degree.-850.degree.C to minimize the amount of carbon in said sheet subsequently;
• d. subjecting the sheet to a secondary recrystallization annealing at a temperature of 800.degree.-920.degree.C for 10 to 120 hours selected so as to grow the crystal grains having (110) (001) orientation;
• and thereafter;
• e. subjecting the sheet to a purification annealing at a temperature greater than 1,000.degree.C and fluctuating in direct proportion to the silicon content so as to remove S and Se, whereby the iron loss of the final product is decreased.