C - Chemistry – Metallurgy – 23 – D
Patent
C - Chemistry, Metallurgy
23
D
117/91
C23D 3/00 (2006.01)
Patent
CA 1048871
ABSTRACT OF THE DISCLOSURE An improved surface on sheet steel having a carbon content below 0.01% preferably below 0.03%, for subsequent porcelain enameling or the deposition of a metal or organic, e.g. paint, coating thereon or in preparation of the sheet steel for a subsequent laminating operation, is provided by subjecting the sheet steel having a carbon content below about 0.1% by weight to oxidation in the presence of air under conditions to build up on the surface of the sheet steel undergoing oxidation an oxide layer having a thickness in the range 0.1-1.5 mils and such that the oxidized sheet steel exhibits again in weight of at least about 0.5 grams per square foot of oxidized surface, followed by subjecting the resulting oxidized sheet steel to reduction in an atmosphere consisting essentially of nitrogen and hydrogen, pre- ferably at a temperature isothermal with the aforesaid oxidation temperature, such as at a temperature in the range 1000-1500°F., to reduce substantially all of the oxide layer to metal and then subjecting the resulting oxidized-reduced sheet steel to decar- burization at a temperature in the range 1000-1500°F. in an atmos- phere consisting essentially of nitrogen, hydrogen and water vapor.
230968
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