METHOD FOR MANUFACTURING STEEL SHEET

PROBLEM TO BE SOLVED: To manufacture a steel sheet containing 0.2 mass% or more Si and exhibiting excellent chemical conversion treatment properties throughout its length and width in an inexpensive manner.SOLUTION: When continuously annealing a steel sheet, three or more heating zones each equipped...

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Bibliographische Detailangaben
Hauptverfasser:	YONEZU KEITA, OTSUKA SHINJI, TSURUMARU HIDEYUKI, SASAKI SHIGETO, HIRASAWA JUNICHIRO, TAKAHASHI HIDEYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS 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 FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To manufacture a steel sheet containing 0.2 mass% or more Si and exhibiting excellent chemical conversion treatment properties throughout its length and width in an inexpensive manner.SOLUTION: When continuously annealing a steel sheet, three or more heating zones each equipped with a direct heating burner group are provided along a sheet passing direction in a direct heating furnace, wherein the steel sheet is heated to 400-600°C at an air ratio of the direct heating burner being 0.60-0.95 in one or more heating zones (A) on the most upstream side, the steel sheet is heated to 600-750°C at an air ratio of the direct heating burner being 1.05-1.25 in one or more heating zones (B) downstream therefrom, and the steel sheet is heated to 650-800°C at an air ratio of the direct heating burner being 0.60-0.95 in one ore more heating zones (C) on the most downstream side.