High strength galvanized steel sheet having excellent formability, weldability, and fatigue properties and method for manufacturing the same

A high strength galvanized steel sheet having excellent formability, weldability, and fatigue properties, comprising:

• a composition of C:
• 0.05% to <0.12%, Si:
• 0.35% to <0.80%, Mn:
• 2.0 to 3.5%, P:
• 0.001 to 0.040%, S:
• 0.0001 to 0.0050%, Al:
• 0.005 to 0.1%, N:
• 0.0001 to 0.0060%, Cr:
• 0.01% to 0.41%, Ti:
• 0.010 to 0.080%, Nb:
• 0.010 to 0.080%, B:
• 0.0001 to 0.0030%, Ni:
• <0.04% and Mo:
• <0.05% all in mass %, and Fe and an unavoidable impurity as the balance;
• a microstructure comprising a recrystallized ferrite phase with a volume fraction of 20 to 70% having an average grain diameter equal to or smaller than 5 μm, retained austenite and pearlite at a total of 5% or less, and bainite and/or martensite having an average grain diameter equal to or smaller than 5 μm;
• a tensile strength equal to or higher than 980 MPa;
• an endurance ratio of 0.42 or more;
• and a galvanized layer on a surface thereof at a coating weight (per side):
• 20 to 150 g/m2.