METHOD OF MANUFACTURING GALVANIZED STEEL SHEET EXCELLENT IN SURFACE SKIN

PROBLEM TO BE SOLVED: To secure a uniform surface skin on which spangle pattern on a galvanized surface is fully eliminated in the manufacture of a galvanized steel sheet. SOLUTION: A skinpass rolling is executed after galvanizing by using dull- rolls having the following surface roughness composed...

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Bibliographische Detailangaben
Hauptverfasser:	YOKOI SUKEYUKI, KITAMURA KAZUMI
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:	PROBLEM TO BE SOLVED: To secure a uniform surface skin on which spangle pattern on a galvanized surface is fully eliminated in the manufacture of a galvanized steel sheet. SOLUTION: A skinpass rolling is executed after galvanizing by using dull- rolls having the following surface roughness composed of craters 11 and rims 12 formed with an electronic beam dull working. That is, the opening diameter (D) of the crater: 30-180 μm, the distance (L) between the adjacent craters: 1.5D-3D (wherein, L=2 μm. The above skinpass rolling is not necessary to excess rolling load. The general rolling reduction condition (the extending ratio of the steel sheet: about 0.5-1%) in the skinpass rolling is applied and the full elimination of the spangle pattern can be achieved with one time of the skinpass.