| 摘要 |
PURPOSE:To produce the unidirectionally oriented electrical steel sheet having a high magnetic flux density and does not require the annealing of a hot rolled sheet by using AlN and MnS as an inhibitor and limiting the contents thereof in the secondary recrystallization process of a steel which does not contain Si. CONSTITUTION:The steel slab contg., by weight %, <=0.06% C, 0.005 to 2.0% Mn, 0.001 to 0.02% S, 0.01 to 0.036% solAl, and 0.002 to 0.014% N is heated and hot rolled and is then subjected to >=1 passes of cold rolling including the final cold rolling at 50 to 75 draft to the final sheet thickness. The heat treatment of this cold rolling is executed in at least the temp. range where gammatransformation arises in a part of the steel sheet. The steel sheet is in succession subjected to decarburization annealing in the temp. region where the alpha-gamma transformation does not arise to limit the contents of the AlN and MnS as the inhibitor for secondary recrystallization in not-excessive amt., by which the unidirectionally oriented electrical steel sheet having the high magnetic flux density is produced. |
