| 摘要 |
PURPOSE:To stably produce a grain-oriented silicon steel sheet excellent in magnetic properties, at the time of producing a grain-oriented silicon steel sheet having a specified compsn., by prescribing the carbon content and oxide content on the surface layer in the producing process. CONSTITUTION:A steel sheet is produced from steel contg., by weight, 2.0 to 4.5% Si, 0.01 to 0.12% C, 0.010 to 0.06% acid soluble Al, 0.0030 to 0.0120% N and 0.02 to 0.15% Mn and furthermore contg. 0.005 to 0.060% of one or two kinds of S and Se. At this time, the finishing temp. of hot rough rolling is regulated to >=1200 deg.C, the time required for movement of the steel sheet from the completion of the rough rolling to the rough finish rolling outlet side is regulated to <=150sec and the temp. of the finish rolling outlet side is regulated to <=1000 deg.C. Moreover, the steel sheet is annealed before its final cold rolling to reduce the carbon content on the surface layer by 0.01 to 0.04%, thereafter, oxides are removed by pickling to regulate the residual oxygen content on the surface of the sheet after being subjected to the final cold rolling into <=0.15g/m<2> and, the oxygen content in the oxides on the surface formed by decarburizing treatment is also regulated to 0.9 to 1.88g/m<2>. |
