| 摘要 |
<p>Disclosed are a high-strength hot-dip galvanized steel plate with tensile strength (TS) of 590 MPa or greater and excellent workability (ductility and flaring properties) and method for manufacturing the same. A high-strength hot-dip galvanized steel plate of excellent workability is characterized by containing a constituent composition, in percent by mass, of C: 0.04% or greater and 0.15% or less, Si: 0.7% or greater and 2.3% or less, Mn: 0.8% or greater and 2.2% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.1% or less, and N: 0.008% or less, and the remainder comprising iron and inevitable impurities, the structure of which comprises, in percent by area, 70% or greater ferrite phase, 2% or greater and 10% or less bainite phase, and 0% or greater and 12% or less pearlite phase, and, in percent by volume, 1% or greater and 8% or less residual austenite phase, the average crystal grain size of the ferrite is 18 µm or less, and the average crystal grain size of the residual austenite is 2 µm or less.</p> |
