Flat rolled ferrous metal for vitreous enameling

Claim 1

THE METHOD OF PREVENTING REBOILING OF ENAMELING STOCK DURING FIRING OF ENAMEL COATINGS THEREON, COMPRISING FORMING ENAMELING STOCK OF LOW-CARBON UNDEOXIDIZED STEEL, IMPARTING A CRITICAL STRAIN THERETO BY COLD REDUCING IT BETWEEN 5 AND 8% TO INSURE MAXIMUM GRAIN GROWTH WHEN ANNEALED, ANNEALING SAID STOCK AT A TEMPERATURE BELOW ITS A1 AND BETWEEN 1225 AND 1400* F. POINT TO CAUSE GRAIN GROWTH THEREIN AND TO COAGULATE THE CARBON IN SAID STOCK INTO LARGE MASSES OF CEMENTITE ALONG THE LARGE GRAIN BOUNDARIES, NORMALIZING SAID STOCK AT A TEMPERATURE BETWEEN 1600 AND 1850* F. TO TRANSFORM SAID CEMENTITE INTO AUSTENITE GRAINS HAVING A EUTECTOID CARBON CONCENTRATION THAT COMBINES WITH OXYGEN, SAID COMBINED OXYGEN BEING THEN DISPERSED FROM THE STOCK TO PREVENT REBOILING DURING FIRING, PLACING A COAT OF ENAMEL FRIT THEREON AND THEN FIRING IT.