ORIGINAL SHEET FOR HOT-DIP GALVANIZATION OR ALLOYED HOT-DIP GALVANIZATION, PRODUCTION METHOD THEREOF, AND HOT-DIP GALVANIZED STEEL SHEET OR ALLOYED HOT-DIP GALVANIZED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a technology capable of producing efficiently by a reduction annealing method, an original sheet for high-strength hot-dip galvanization or high-strength alloyed hot-dip galvanization as a raw material for producing high-strength plated steel sheet in which generation of an unplated part is suppressed.SOLUTION: An original sheet for hot-dip galvanization or alloyed hot-dip galvanization satisfies a following condition: in a measurement visual field of 33.6 μm×41.4 μm on the surface after reduction annealing, when mapping strength by an electron beam microanalyzer is divided into 16 parts with 15 intervals from 0 to 240, a region occupied by the mapping strength of 195 or higher is 70% or more.SELECTED DRAWING: None