C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/12 (2006.01) H01L 39/24 (2006.01)
Patent
CA 2154143
Disclosed is a method for producing a grain-oriented electrical steel sheet having mirror surface containing 0.8 to 4.8% of Si in the form of a strip which has been subjected to a conventional series of operations including hot rolling with or without annealing, cold rolling once or at least twice with intermediate annealing to obtain a final thickness, decarburization annealing with or without nitriding treatment, coating the steel sheet with an annealing separator mainly containing non-hydrating oxide and final annealing, the improvement comprising: satisfying the relationship [A] > 0.2 x [O] where [A] is the total concentration of alkali metal impurity in the annealing separator (weight %), and [O] is the amount of oxygen contained in the steel sheet just prior to the final annealing (g/m2).
Fujii Hiroyasu
Murakami Kenichi
Ushigami Yoshiyuki
Yamazaki Shuichi
Goudreau Gage Dubuc
Nippon Steel Corporation
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