Patent ID: 8592049

Claim:
A hot dip galvanized steel sheet excellent in shapeability and plateability, comprising at least one high strength steel sheet portion containing, by mass %, C: 0.05 to 0.25%, Si: 0.3 to 2.5%, Mn: 1.5 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, N: 0.0060% or less, and the balance of Fe and unavoidable impurities; a galvanized layer containing Al: 0.05 to 10 mass % and Fe: 0.05 to 3 mass % and the balance of Zn and unavoidable impurities on the at least one high strength steel sheet portion; oxides containing Si selected from at least one of SiO 2 , FeSiO 3 , Fe 2 SiO 4 , MnSiO 3 , and Mn 2 SiO 4 , in an average content of 0.6 to 10 mass % at crystal grain boundaries and in crystal grains of the at least one high strength steel sheet portion of 5 μm or less from an interface between the at least one high strength steel sheet portion and the galvanized layer; and Fe—Zn alloy with an average grain size of 0.5 to 3 μm is created on the interface between the at least one high strength steel sheet portion and the galvanized layer and into the galvanized layer, wherein the oxides containing Si include at least one of FeSiO 3 , Fe 2 SiO 4 , MnSiO 3 , or Mn 2 SiO 4 provided on the interface between the at least one high strength steel sheet portion and the galvanized layer, and wherein the oxides containing Si further include SiO 2 provided in the at least one high strength steel sheet portion of 5 μm or less from an interface between the at least one high strength sheet portion and the galvanized layer.