Method of producing grain-oriented electrical steel sheets...

Details Method of producing grain-oriented electrical steel sheets... Method of producing grain-oriented electrical steel sheets...

C - Chemistry, Metallurgy

21

D

C21D 8/12 (2006.01) H01F 1/16 (2006.01) C21D 3/04 (2006.01)

Patent

CA 2068592

METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEETS OR STRIPS ABSTRACT OF THE DISCLOSURE 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°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.

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