Method of manufacturing magnetic sheets

Claim 1

IN THE PROCESS OF PRODUCING A MAGNETIC SHEET CHARACTERIZED BY A HIGH PROPORTION OF GANIS HAVING A CUBEON-FACE ORIENTATION, THE STEPS COMPRISING HOT ROLLING A MEMBER OF AN ALLOY COMPRISING FROM 2% TO 5% SILICON AND THE BALANCE BEING IRON EXCEPT FOR INCIDENTAL ADDITIONS AND IMPIRITIES, TO PRODUCE A THICK PLATE, SUBJECTING THE THICK PLATE TO A SERIES OF COLD ROLLING STEPS TO PRODUCE A SHEET OF THE DESIRED FINAL THICKNESS, EACH COLD ROLLING STEP EFFECTING A REDUCTION IN THICKNESS OF FROM 25% TO 90% AND THE FINAL COLD ROLLING STEP EFFECTING A REDUCTION IN THICKNESS OF FROM 50% TO 90%, THE SHEET BEING ANNEALED BETWEEN THE SUCCESSIVE COLD ROLLING STEPS AT A TEMPERTURE OF FROM 750% C. IN A REDUCING ATMOSPHERE, AND SUBJECTING THE SHEET TO A FINAL ANNEAL AFTER THE FINAL COLD ROLLING STEP AT A TEMPERATURE OF FROM 950* C. TO 1425* C. FOR A PERIOD OF TIME OF FROM 5 MINUTES TO ABOUT 20 HOURS UNTIL SUBSTANTIALLY COMPLETE SECONDARY RECRYSTALLIZATION HAS BEEN EFFECTED, THE ATMOSPHERE DURING FINAL ANNEAL BEING A DRY REDUCING ATMOSPHERE SUBSTANTIALLY COMPLETELY FREE FROM OXYGEN MOISTURE AND OXIDIZING COMPONENTS WHICH WILL REACT WITH THE SURFACE OF THE SHEET AND BEING CAPABLE OF CAUSING THE REDUCTION OF SILICA DURING THE FINAL ANNEAL, THE ATMOSPHERE, ANNEALING TEMPERATURE AND ANY MATERIALS REPRESENT ON THE SHEET SURFACE BEING SO CORRELATED THAT DURING THE INITIAL PERIOD OF ANNEALING PRIOR TO SECONDARY RECRYSTALLIZATION ANY SURFACE OXIDE FILMS ON THE SHEETS WILL DISAPPEAR AND THE SHEET WILL BECOME BRIGNT WHEREBY CUBE-ON-FACE GRAIN GROWTH WILL PREDOMINATE DURING THE ENSUING SECONDARY RECRYSTALLIZATION.