| 摘要 |
An alloyed hot-dip galvanized steel sheet has a composition containing 0.05 to 0.25 wt% of C, 0.5 wt% or less of Si, 1 to 3 wt% of Mn, 0.1 wt% or less of P, 0.01 wt% or less of S, 0.1 to 2 wt% of Al, and less than 0.005 wt% of N, and satisfying the relations, Si + Al ‰¥ 0.6 wt%, (0.0006 × Al) wt% ‰ N ‰ (0.0058 - 0.0026 × Al) wt%, and Al ‰ (1.25 × C 0.5 - 0.57 × Si + 0.625 × Mn) wt%, the balance including Fe and inevitable impurities. The alloyed hot-dip galvanized steel sheet can be obtained without passing through a complicated process, has excellent surface appearance and anti-secondary work embrittlement and high strength, and is thus suitable for application to an automobile steel sheet. |
