HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND HIGH-STRENGTH ALLOYED HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT BENDABILITY AND MINIMAL STRENGTH DIFFERENCE BETWEEN CENTER PART AND END PART IN SHEET WIDTH DIRECTION, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide: a high-strength hot-dip galvanized steel sheet in which bendability of the high-strength hot-dip galvanized steel sheet is improved, and in which strength difference between a center part and end parts in the sheet width direction is reduced; and a method for producing the high-strength hot-dip galvanized steel sheet.SOLUTION: A high-strength hot-dip galvanized steel sheet is a hot-dip galvanized steel sheet having a hot-dip galvanized layer on a surface of a base steel sheet containing, C, Mn, P, S, and Al, Ti and B in amounts satisfying the following expression (1), and N, and Si as needed, with the remainder comprising iron and unavoidable impurities. The metallographic structure of the base steel sheet includes martensite, bainite, and ferrite, and the ratios of each with respect to the overall metallographic structure are 50 area% or more of the martensite, 15-50 area% of the bainite, and 5 area% or less (including 0 area%) of the ferrite. 0.005×[Mn]+0.02×[B]+0.025≤[Ti]≤0.15 (1).