| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high strength galvanized steel sheet excellent in moldability and its manufacturing method.SOLUTION: There is provided a galvanized steel sheet having a structure having a component composition containing, by mass%, C: over 0.03% to 0.2, Si:0.3% or less (including 0%), Mn:0.5 to 2.5%, P:0.1% or less (including 0%), S:0.010% or less (including 0%), Al:0.001 to 0.1%, N:0.002% to 0.03% and balance iron with inevitable impurities, consisting of, by area ratio, ferrite (α):30 to 80%, bainite+tempered martensite (B+TM):20 to 70%, martensite:10% or less (including 0%), and retained austenite:3% or less (including 0%), and making an average particle diameter ofα, a number density of cementite (θ) having a circle-equivalent diameter of 200 nm or more present inα, the average particle diameter and the number density ofθpresent in lath in "BP+TM", and anαconnection rate defining existence form ofαinto predetermined values.</p> |
