Doubly-oriented aluminum iron magnetic sheets

Claim 1

IN THE PROCES OF PRODUCING SHEETS OF ALUMINUMIRON ALLOY COMPRISING ESSENTIALLY FROM 1% TO 10% BY WEIGHT OF ALUMINUM AND THE BALANCE BEING IRON EXCEPT FOR INCIDENTAL IMPURITIES, THE GRAINS OF THE SHEET BEING PREFERENTIALLY ORIENTED SO THAT THE SHEET EXHIBITS OPTIMUM MAGNETIC PROPERTIES IN TWO DIRECTIONS IN THE PLANE OF THE SHEET, THE STEPS COMPRISING HOT WORKING A BODY OF THE ALUMINUM-IRON ALLOY AT A TEMPERATURE OF THE ORDER OF FROM 800*C. TO 1100*C. TO PRODUCE A PLATE OF A THICKNESS OF THE ORDER OF FROM 0.25 TO 0.6 INCH, COLD ROLLING THE PLATE TO EFFECT A REDUCTION IN THICKNESS OF FROM 60% TO 90%, ANNEALING THE RESULTING RELATIVELY THICK SHEET AT A TEMPERATURE OF FROM 700*C. TO 1050*C FOR AT LEAST 15 MINUTES TO REMOVE STRESSES AND TO RECRYSTALLIZE THE METAL, COLD ROLLING THE THICK SHEET TO EFFECT A SECOND AND FINAL REDUCTION IN THICKNESS OF THE ORDER OF FROM 60% TO 90% SO AS TO PRODUCE A THIN SHEET OF A THICKNESS OF THE ORDER OF 0.03 INCH AND LESS, AND ANNEALING THE THIN SHEET IN A REDUCTING ATMOSPHERE AT A TEMPERATURE OF FROM 900% C. TO 1050* C. FOR AT LEAST ONE HOUR TO RECRYSTALLIZE THE ALLOY TO CUBE ON FACE GRAINS, WHICH GRAINS HAVING AN AVERAGE DIAMETER NOT EXCEEDING ONE MILLIMETER.