PRODUCTION OF GALVANNEALED STEEL SHEET

PURPOSE:To improve the alloying rate in the method for producing a galvannealed steel sheet. CONSTITUTION:At the time of continuously applying galvanizing and successively executing alloying under heating, cooling is executed so as to regulate the sheet temp. into the range of 100 to 460 deg.C immed...

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Bibliographische Detailangaben
Hauptverfasser:	TAIRA TAKETOSHI, NAKAMURA FUMIAKI
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
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the alloying rate in the method for producing a galvannealed steel sheet. CONSTITUTION:At the time of continuously applying galvanizing and successively executing alloying under heating, cooling is executed so as to regulate the sheet temp. into the range of 100 to 460 deg.C immediately after plating, and again, heating is executed so as to regulate the sheet temp. into the range of 460 to 600 deg.C to produce a galvannealed steel sheet. As for the cooling method, the method using a gas wiping system using a gas cooled at the time of wiping after the plating and the method of setting a cooling zone after the plating and executing cooling treatment are adopted.