| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength hot-dip galvanized steel sheet superior in plating adhesion and formability, and a method for manufacturing the same.SOLUTION: The high-strength hot-dip galvanized steel sheet with tensile strength of ≥980 MPa and superior plating adhesion and formability has a hot-dip galvanized layer, which includes <7 mass% Fe and the balance Zn and Al with inevitable impurities, on the surface of a steel plate, which includes, by mass%, 0.10-0.40% C, 0.01-3.0% Si, 1.7-3.0% Mn, ≤0.04% P, ≤0.01% S, 0.005-2.0% Al, 0.001-0.01% N, and the balance Fe with inevitable impurities while satisfying a total content of Si and Al (Si+Al) of >0.5%, and has a microstructure including, by volume fraction, ≥40% bainite and one or more among three kinds of martensites [1], [2], and [3] in total as the main phase, not less than 0.1% and less than 8% of retained austenite, and the balance structure ferrite. |
