To provide a high strength hot-dip galvanized steel sheet sufficiently securing both of the strength and the corrosion resistance of the steel sheet and having good press-workability obtaining 530-880 MPa tensile strength TS.
The high strength hot-dip galvanized steel sheet having good corrosion resistance and press-workability after coating, has the peculiarity, in which the hot-dip galvanized layer of Zn-Al alloy plating, Zn-Al-Si alloy plating, Zn-Al-Mg alloy plating or Zn-Al-Mg-Si alloy plating, containing Ni and/or Cu, is coated on the high strength steel sheet composed by mass% of 0.05-0.15% C, 0.3-2.0% Si, 1.5-2.8% Mn, ≤0.03% P, ≤0.02% S, 0.005-0.5% Al, ≤0.006% N and the balance Fe with unavoidable impurities and further, satisfying (%Mn)/(%C)≥15 and (%Si)/(%C)≥4, in the case of using %C, %Si, %Mn for C, Si, Mn content, respectively.
TAKAHASHI AKIRA
SAKUMA KOJI
Next Patent: METHOD FOR PRODUCING HOT-DIP GALVANIZED STEEL SHEET