Production manner null of the non directivity electromagnetic steel sheet where flux density in the magnetic field is superior

摘要

PURPOSE:To manufacture a silicon steel sheet excellent in magnetic properties by specifying the tension of a steel sheet at the time of passing the steel sheet and also using a furnace roll having a roll diameter and a crown in specific ranges, respectively, in the final continuous annealing in a vertical furnace to prevent the introduction of strain. CONSTITUTION:A cold rolled steel sheet is passed through a vertical continuous annealing furnace while regulating the tension of the steel sheet to =1.0kg/mm2. Further, a furnace roll satisfying the relations in 1200=D/t=2600 and 0.5= D=3.5 when D(mm), (t), and D represent the diameter of furnace roll, the thickness of the steel sheet, and the amount of roll crown, respectively, at a temp. in the region of 400-900 deg.. By this method, the introduction of strain at the time of winding the sheet round the roll is properly prevented and a non-oriented silicon steel sheet excellent in magnetic properties, particularly in low magnetic field properties, can be manufactured.