| 摘要 |
<p>The present invention provides a high strength thin excellent workability and galvanizability, having a composition comprising from 0.01 to 0.20 wt.% C, up to 1.0 wt.% Si, from 1.0 to 3.0 wt.% Mn, up to 0.10 wt.% P, up to 0.05 wt.% S, up to 0.10 wt.% Al, up to 0.010 wt.% N, up to 1.0 wt.% Cr, from 0.001 to 1.00 wt.% Mo, and the balance Fe and incidental impurities, wherein a band structure comprising a secondary phase has a thickness satisfying the relation Tb / T </= 0.005 (where, Tb: average thickness of the band structure in the thickness direction of steel sheet; T: steel sheet thickness), and a manufacturing method thereof, and a manufacturing method of a high strength hot-dip galvanized steel sheet or a high strength galvannealed steel sheet applying hot-dip galvanizing or further galvannealing, and giving an excellent workability, a high tensile strength, and excellent galvanizability, coating adhesion and corrosion resistance. <IMAGE></p> |
