Hot dip galvanized and galvannealed steel sheet having excellent elongation properties

A method for manufacturing a hot-dip galvanized steel sheet having excellent elongation properties, the method comprising:

• preparing a steel slab having compositional components of claim 1, and thereafter reheating the steel slab;
• performing finish hot-rolling on the reheated steel slab in a temperature range of Ar3+50° C.-950° C., and thereafter coiling the finish hot-rolled steel sheet at 450-700° C.;
• performing cold-rolling on the coiled hot-rolled steel sheet with a reduction ratio of 40-80%, and thereafter performing continuous annealing on the cold-rolled steel sheet in a temperature range of 760-850° C.;
• performing a first cooling on the continuous annealed steel sheet to a temperature range of 630-670° C. at an average cooling rate of 2-8° C./s, and thereafter performing a second cooling on the first cooled steel sheet to a temperature range of Ms+20° C. to Ms+50° C. at an average cooling rate of 3-10° C./s;
• and
• performing hot-dip galvanizing on the second cooled steel sheet in a temperature range of 440-480° C., and thereafter cooling the hot-dip galvanized steel sheet to a temperature of Ms−100° C. or lower at an average cooling rate of 4° C./s or higher.