Verfahren zur kontinuierlichen Heisstauchbeschichtung eines Stahlbandes mit Aluminium

Continuous hot dip aluminum coated fertitic chromium alloy steel strip. Strip is cleaned by heating to a temperature no greater than about 650 DEG C in a direct fired furnace. The cleaned strip is further heated in a protective atmosphere containing at least 95% by volume hydrogen, cooled in the pro...

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Bibliographische Detailangaben
Hauptverfasser:	LEE, DANNY E., MIDDLETOWN, OH 45042, COLEMAN, RICHARD A., WEST CHESTER, OH 45069, BOSTON, STEVEN L., MIDDLETOWN, OH 45042, KILBANE, FARRELL M., CENTERVILLE, OH 45459, SEAY, WILLIAM R., FRANKLIN, OH 45005
Format:	Patent
Sprache:	ger
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	Continuous hot dip aluminum coated fertitic chromium alloy steel strip. Strip is cleaned by heating to a temperature no greater than about 650 DEG C in a direct fired furnace. The cleaned strip is further heated in a protective atmosphere containing at least 95% by volume hydrogen, cooled in the protective hydrogen atmosphere to near or slightly above the melting point of an aluminum coating metal, and passed into a bath of the aluminum coating metal. The low direct fired furnace cleaning temperature and hydrogen protective atmosphere provides good wetting of a chromium alloy steel surface to prevent uncoated areas or pin holes in the aluminum coated layer.