Iron-aluminum materials for magnetic applications

Claim 2

A RECRYSTALLIZED IRON-ALUMINUM STRIP FOR MAGNETIC APPLICATIONS WHICH CONSISTS ESSENTIALLY OF A DUCTILE IRONALUMINUM ALLOY CONSISTING ESSENTIALLY OF 3 TO 7 WEIGHT PERCENT TO ALUMINUM AND THE BALANCE IRON, SAID STRIP BEING ABOUT 1 TO 18 MILS THICK AND AND HAVING THE FOLLOWING PROPERTIES AS DETERMINED FROM A D. C. HYSTERESIS LOOP ON THE STRIP: REMANENCE NOT EXCEEDING 9,500 GAUSS, AN INDUCTION AT 10 OERSTEDS OF LEAST 12,000 GAUSS, AN INDUCTION FORCE NOT EXCEEDING 0.50 OERSTED.

Claim 3

THAT METHOD OF PRODUCING DOUBLY ORIENTED IRONALUMINUM TAPES WHICH COMPRISES COLD ROLLING A HOT ROLLED PLATE OF A THICKNESS OF ABOUT 0.4 TO 0.65 INCH AND WHICH CONSISTS ESSENTIALLY OF ABOUT 3 TO 7 PERCENT BY WEIGHT OF ALUMINUM AND THE BALANCE SUBSTANTIALLY ALL IRON, BY 70 TO 80 PERCENT OF ITS THICKNESS ANNEALING THE RESULTING STRIP AT A TEMPERATURE OF 850* TO 1100*C. TO STRESS RELIEVE SAID STRIP, COLD ROLLING THE ANNEALED STRIP TO REDUCE IT BY 85 TO 9K PERCENT OF ITS THICKNESS, ANNEALING THE STRIP AT 700* TO 850*C. COOLING THE STRIP, THEN HEATING IT AT A TEMPERATURE OF 1050*C. TO 1300*C. FOR ONE-HALF TO TWELVE HOURS TO CAUSE GRAIN GROWTH, COLD ROLLING THE STRIP TO REDUCE IT BY 60 TO 80 PERCENT OF ITS THICKNESS, AND THEN HEATING THE RESULTING TAPE AT A TEMPERATURE ABOVE ITS RECRYSTALLIZATION TEMPERATURE TO CAUSE A CUBE-ON-FACE ORIENTATION OF THE RESULTING GRAIN STRUCTURE.

Claim 4

THAT METHOD OF PRODUCING DOUBLY ORIENTED IRONALUMINUM TAPES WHICH COMPRISES COLD ROLLING A HOT ROLLED PLATE OF A THICKNESS OF ABOUT 0.4 TO 0.65 INCH AND WHICH CONSISTS ESSENTIALLY OF ABOUT 3 TO 7 PERCENT BY WEIGHT OF ALUMINUM AND THE BALANCE SUBSTANTIALLY ALL IRON, BY 70 TO 80 PERCENT OF ITS THICKNESS ANNEALING THE RESULTING STRIP AT A TEMPERATURE OF 850* TO 1100*C. TO STRESS RELIEVE SAID STRIP, COLD ROLLING THE ANNEALED STRIP TO REDUCE IT BY 85 TO 9K PERCENT OF ITS THICKNESS, ANNEALING THE STRIP AT 700* TO 850*C. COOLING THE STRIP, THEN HEATING IT AT A TEMPERATURE OF 1050*C. TO 1300*C. FOR ONE-HALF TO TWELVE HOURS TO CAUSE GRAIN GROWTH, COLD ROLLING THE STRIP TO REDUCE IT BY 60 TO 80 PERCENT OF ITS THICKNESS, AND THEN HEATING THE RESULTING TAPE AT A TEMPERATURE ABOVE ITS RECRYSTALLIZATION TEMPERATURE TO CAUSE A CUBE-ON-FACE ORIENTATION OF THE RESULTING GRAIN STRUCTURE.