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AssigneeNippon Steel Corporation
InventorsShuichi Yamazaki, Yoshiyuki Ushigami, Hiroyasu Fujii, Kenichi Murakami
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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.times. 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/m.sup.2).
In a method for producing a grain-oriented electrical steel sheet having a 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 with an annealing separator mainly containing non-hydrating oxide, and final annealing, the improvement comprising:
In a process for producing a grain-oriented electrical steel sheet having a mirror surface containing 0.8 to 4.8% of Si, 0.012 to 0.05% of soluble Al, and less than 0.01% of N, 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 nitriding treatment, coating with an annealing separator mainly containing non-hydrating oxide and final annealing, the improvement comprising:
In a process for producing a grain-oriented electrical steel sheet having a mirror surface containing 0.8 to 4.8% of Si, 0.012 to 0.05% of soluble Al, less than 0.01% of N, 0.02 to 0.3% of Mn, and 0.005 to 0.040% of S, 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, coating with an annealing separator mainly containing non-hydrating oxide and final annealing, the improvement comprising:
In a process for producing a grain-oriented electrical steel sheet having a mirror surface containing 0.8 to 4.8% of Si, 0.02 to 0.3% of Mn, and 0.005 to 0.040% of S, 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, coating with an annealing separator mainly containing non-hydrorating oxide and final annealing, the improvement comprising:
Dependencies are inferred from the claim text.