High-strength hot-dip galvanized steel sheet having excellent ductility and moldability, and method for producing same

• Main Authors: AHN YEON-SANG, CHOI KANG-HYUN, RYU JOO-HYUN
• Format: Patent
• Language: Chinese; English
• Published: 22.08.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Provided is a high-strength hot-dip galvanized steel sheet having excellent ductility and moldability. The hot-dip galvanized steel sheet according to the present invention contains, in wt%, 0.06-0.16% of carbon (C), 0.8% or less (excluding 0%) of silicon (Si), 2.1-2.7% of manganese (Mn), 0.4% or less (excluding 0%) of molybdenum (Mo), 1% or less (excluding 0%) of chromium (Cr), 0.1% or less (excluding 0%) of phosphorus (P), 0.02% or less of sulfur (S), 1% or less (excluding 0%) of aluminum (sol.Al), 0.001-0.04% of titanium (Ti), 0.001-0.04% of niobium (Nb), 0.01% or less (excluding 0%) of nitrogen (N), 0.01% or less of boron (B), 0.05% or less of antimony (Sb), and the balance of Fe and other unavoidable impurities. C, Si, Al, Mn, Cr, Mo, and B in the steel components in the matrix structure at a position 1/4 t of the thickness of the base steel sheet satisfy relational expression 1, and the microstructure of the base steel sheet is composed of, in area%, at least 70% of bainite and tempered martensite in to