A PROCESS FOR GALVANNEALED COATINGS IN STEEL SHEETS/STRIPS WITHOUT GALVANNEALING OPERATION

The present invention relates to a process for galvannealed coatings in steel sheets/strips without galvannealing operation comprises the steps of cleaning the steel sheets/strips by passing the uncoiled sheets/strips through an Electrolytic cleaning chamber wherein brushing the steel sheets with al...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	MONOJIT DUTTA, RAJIV MISHRA, NIKHILES BANDYOPADHYAY, DEBASHISH BHATTACHARJEE
Format:	Patent
Sprache:	eng
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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The present invention relates to a process for galvannealed coatings in steel sheets/strips without galvannealing operation comprises the steps of cleaning the steel sheets/strips by passing the uncoiled sheets/strips through an Electrolytic cleaning chamber wherein brushing the steel sheets with alkaline liquid, rinsing and drying takes place and annealing the cleaned steel sheets/strips by passing the uncoiled hard sheets/strips through a heating chamber at 500-650°C under a hydrogen or nitrogen controlled atmosphere to impart strength and formability property and dipping the heated sheets/strips in a coating bath containing a molten mixture of Zn-(0.14-0.16% Al) for full wetting for 3-4 seconds and skin passing the coated strips for uniform lamination of coated material and coating the Zn-coated strips with organic compound in an organic coating chamber and finally recoiling the sheets/strips in a recoiler.