| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet plated with hot-dip zincing having metallurgical structure where martensite and retained austenite coexist in ferrite and good press-workability with 490-880 MPa tensile strength TS by the strengthening of the composite structure. SOLUTION: The high strength hot-dip zincing steel sheet having good corrosion resistance and press-workability is characterized in that on the high strength steel sheet containing by mass % 0.05-0.15% C, 0.3-2.00% Si, 1.5-2.8% Mn, <=0.03% P, <=0.02% S, 0.05-0.5% Al, <=0.006% N and if necessary, containing 0.0002-0.002% B and the balance Fe with inevitable impurities and further, when %C, %Si and %Mn show C, Si, and Mn contents, respectively, satisfying (%Mn)/(%C)>=15 and (%Si)/(%C)>=4, the hot-dip zincing layer containing 0.05-0.5 mass % Al, 5-15 mass % Fe and further, one or more kinds among 0.1-10 mass % Ni, 0.05-3 mass % Cu and 0.05-1 mass % Mg and the balance Zn with inevitable impurities, is provided.
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