METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEETS OR STRIPS

摘要

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEETS OR STRIPS The invention relates to a method of producing grain-oriented electrical steel sheets or strips having a final thickness in the range of 0.1 to 0.5 mm. A slab of a steel having the composition set forth in Claim 1 is hot rolled, then possibly annealed and then cold rolled In at least two stages with an intermediate annealing of the strip prior to the final cold rolling stage at a temperature in the range of 800 to 1100.degree.C for 30 to 600 seconds and with an accelerated cooling from the intermediate annealing temperature at a speed higher than 50 K/sec. After a tempering annealing treatment prior to the final cold rolling stage, in which a thickness reduction of 40 to 80% is performed, a recrystallization annealing is carried out in a moist atmosphere, accompanied by the decarbonization of the strip cold rolled to the final thickness. After a separating agent has been applied to the strip surfaces, high temperature annealing is performed.