Method of coating carbon steel

Details Method of coating carbon steel Method of coating carbon steel

C - Chemistry, Metallurgy

21

D

148/42, 117/94

C21D 1/76 (2006.01) C23C 2/02 (2006.01) C23C 2/38 (2006.01)

Patent

CA 1067000

ABSTRACT OF THE DISCLOSURE A method of preparing carbon steel strip and sheet for hot dip metallic coating in a Selas-type direct-fired furnace, wherein the atmosphere in the furnace is controlled to contain from about 3% oxygen to about 2% excess combus- tibles by volume, thereby forming a thin iron oxide film on the carbon steel surfaces. The strip and sheet is then heated in a subsequent furnace containing at least 5% hydro- gen by volume at a temperature sufficient to reduce the oxide film, viz., at least about 675°C. The direct-fired furnace is preferably operated at stoichiometrically equivalent fuel:air ratios.

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