Steel sheet for hot-dip galvanizing, hot-dip galvanized steel sheet, and alloyed hot-dip galvanized steel sheet

• Main Authors: YU HANG, MAEDA TAKAYUKI, KAWAKAMI AKIRA, IRIE HIROSHI, SHIGE HIROO
• Format: Patent
• Language: Chinese; English
• Published: 17.10.2023
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

According to the present invention, it is possible to provide a steel sheet for hot-dip galvanizing, whereby an alloyed hot-dip galvanized steel sheet having a high Si content and suppressed alloying irregularities can be produced. The steel sheet for hot-dip galvanizing according to the present invention comprises: an internal oxide layer which is located between the surface layer of the steel sheet and the steel sheet base material portion and contains an oxide containing Si, the Si content in the chemical composition of the steel sheet being 1.0 mass% or more, and the internal oxide layer being formed of an oxide containing Si at the rear end in the rolling direction of the steel sheet; the amount of solid-solution Si to a depth of 1 [mu] m from the surface of the steel sheet measured at four positions, i.e., 10 mm, 30 mm, and 50 mm away from the edge in the width direction of the coil, and the position in the center in the width direction of the coil is 1.4 wt% or less, each of the amounts of solid-soluti