Process involving cooling in a static atmosphere for high permeability silicon steel comprising copper

Claim 1

IN A PROCESS FOR PRODUCING ELECTROMAGNETIC SILICON STEEL HAVING A CUBE-ON-EDGE ORIENTATION AND A PEREMEABILITY OF AT LEAST 1850 (G OE) AT 10 OERSTEDS, WHICH PROCESS INCLUDES THE STEPS OF: PREPARING A MELT OF SILICON STEEL; CASTING SAID STEEL; HOT ROLLING SAID STEEL INTO A HOT ROLLED BAND; SUBJECTING SAID STEEL TO AT LEAST ONE COLD ROLLING; SUBJECTING SAID STEEL TO A FINAL ANNEALING PRIOR TO THE FINAL COLD ROLLING; DECARBURIZING SAID STEEL; AND FINAL TEXTURE ANNEALING SAID STEEL; THE IMPROVEMENT COMPRISING THE STEPS OF CARRYING OUT SAID FINAL ANNEAL PRIOR TO THE FINAL COLD ROLLING AT A TEMPERATURE OF FROM 1400 TO 2150*F FOR A PERIOD OF FROM 15 SECONDS TO 2 HOURS; COOLING SAID STEEL FROM A TEMPERATURE BELOW 1700*F AND ABOVE 750*F TO A TEMPERATURE AT LEAST AS LOW AS 500*F WITH A LIQUID QUENCHING MEDIUM OR GASEOUS STREAM AND FROM ITS MAXIMUM ANNEALING TEMPERATURE TO SAID TEMPERATURE BELOW 1700*F AND ABOVE 750*F AT A RATE WHICH IS NO FASTER THAN ONE WHEREIN THE STEEL IS COOLED IN A STATIC ATMOSPHERE OR IN A CONTINUOUS PROCESSING LINE WHERE THERE IS SOME RELATIVE MOTION BETWEEN THE ATMOSPHERE AND THE STEEL, ALTHOUGH THE ONLY DELIBERATEMOTION IS THAT IMPARTED TO THE STEEL, AND SAID COOLING THE COOLED STEEL AT A REDUCTION OF ATLEAST 80%; SAID MELT CONSISTING ESSENTIALLY OF, BY WEIGHT, UP TO 0.07% CARBON, FROM 2.60 RO4.0% SILICON, FROM 0.03 TO 0.24% MANGANESE, FROM 0.01 TO 0.09% OF MATERIAL FROMTHE GROUP CONSISTING OFSULFUR ANDSELENIUM, FROM 0.015 TO0.04% ALUMINUM, UP TO 0.02% NITROGEN, FROM 0.1 TO 0.5% COPPER, FROM 0...45 TO 0.00035% BORON, BALANCE IRON.