PRODUCTION OF HOT-DIP GALVANIZED STEEL PLATE EXCELLENT IN R-VALUE

PURPOSE:To produce a hot-dip galvanized hot rolled steel plate excellent in surface characteristics of plating, adhesive strength of plating, and r-value by successively subjecting a steel with specific composition to casting, finish rolling, coiling, dry descaling, plate temp. regulation, and hot-d...

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Hauptverfasser:	YAMAZAKI JIRO, KAWASAKI KAORU, OGURA MASAMI, TANAKA KOICHIRO, WAKITA JUNICHI, KONO OSAMU, HIGUCHI TOSHIYUKI, HAJI JUNJI, HIWATARI SEIROU, EZAKA KAZUAKI, KATO HIDEO
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:	PURPOSE:To produce a hot-dip galvanized hot rolled steel plate excellent in surface characteristics of plating, adhesive strength of plating, and r-value by successively subjecting a steel with specific composition to casting, finish rolling, coiling, dry descaling, plate temp. regulation, and hot-dip galvanizing under respectively specified conditions. CONSTITUTION:A steel having a composition consisting of, by weight, 0.10-0.60% Mn, 0.001-0.012% S, and the balance Fe with inevitable components is cast and solidified at 1400-1200 deg.C at >=5.0 deg.C/min cooling rate and formed into a cast slab. The finish rolling of this cast slab is started within 60min from the initiation of solidification and finished at a temp. not lower than the Ar3 point, and the resulting plate is coiled at >=350 deg.C. Subsequently, the plate is subjected to dry descaling at >=350 deg.C, to plate temp. regulation prior to plating up to 400-600 deg.C, and to hot-dip galvanizing. At this time, the atmosphere is regulated to nonoxidizing or reducing atmosphere at least, from the completion of dry descaling an thereafter. By this method, the hot rolled steel plate having superior r-value, deep drawability, and workability can be produced with high productivity and workability.