Coating processes – With pretreatment of the base – Heating or drying pretreatment
Patent
1974-08-22
1976-02-03
Kendall, Ralph S.
Coating processes
With pretreatment of the base
Heating or drying pretreatment
427319, 427321, 427433, C23C 100
Patent
active
039365433
ABSTRACT:
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 combustibles 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% hydrogen by volume at a temperature sufficient to reduce the oxide film, viz., at least about 675.degree.C. The direct-fired furnace is preferably operated at stoichiometrically equivalent fuel:air ratios.
REFERENCES:
patent: 2197622 (1940-04-01), Sendzimir
patent: 3320085 (1967-05-01), Turner
patent: 3383250 (1968-05-01), Pierson et al.
Byrd Fred
Compton Thomas A.
Dunbar Frank C.
Pierson Marvin B.
Armco Steel Corporation
Kendall Ralph S.
Smith John Douglas
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