Grain-oriented electrical steel sheet having stable magnetic...

C - Chemistry – Metallurgy – 21 – D

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38/22, 148/8

C21D 8/12 (2006.01) B23P 15/00 (2006.01) C23C 22/74 (2006.01) H01F 1/16 (2006.01)

Patent

CA 1246968

- 32 - GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING STABLE MAGNETIC PROPERTIES RESISTANT TO STRESS-RELIEF ANNEALING, AND METHOD AND APPARATUS FOR PRODUCING THE SAME ABSTRACT OF THE DISCLOSURE A grain-oriented electrical steel sheet having a low watt loss after stress relief annealing is proposed. The steel sheet, which is final texture annealed, and to which tension is imparted, has a number of recessed parts on the surface thereof forming indentations into the steel sheet body having a depth in the range of from 0.01 to 0.1 mm. The recessed parts are filled with a composition having a coefficient of thermal expansion smaller than that of the steel sheet body. From the recessed parts and the composition the magnetic domains are subdivided.

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