HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH EXCELLENT FORMABILITY AND PROCESS FOR PRODUCING SAME

Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same. The high-strength hot-dip galvanized steel sheet comprises, in mass%: 0.005-0.009% of C; 0.05% or less of Si; 0.3-0.8% of Mn; 0.06-0.09% of P; 0.01% or less of S; 0.005% or less o...

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Bibliographische Detailangaben
Hauptverfasser:	HA, Yu-Mi, YEOM, Jun-Sung
Format:	Patent
Sprache:	eng ; fre ; ger
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:	Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same. The high-strength hot-dip galvanized steel sheet comprises, in mass%: 0.005-0.009% of C; 0.05% or less of Si; 0.3-0.8% of Mn; 0.06-0.09% of P; 0.01% or less of S; 0.005% or less of N; 0.1% or less of Al; 0.05-0.08% of Mo; 0.01-0.03% of Ti; 0.03-0.045% of Nb; 0.06-0.1% of Cu; 0.0015% or less of B; and a balance of Fe and inevitable impurities, wherein C, Ti, and Nb satisfy relation 1, and alloy microstructures include 95% or more of ferrite in terms of area fraction, wherein the ferrite has an average grain size of 15 µm or less, with ultrafine grains of 6 µm or less occupying 5-10% in a 1 mm × 1 mm area, and has a surface nanohardness value of 1-1.5 GPa.