| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength plated steel sheet excellent in corrosion resistance, molten metal embrittlement crack resistance and bendability at a weld zone.SOLUTION: There is provided a high strength molten Zn-Al-Mg-based plated steel sheet for weld structure member having a steel composition containing, by mass%, C:0.050 to 0.150%, Si:0.001 to 1.00%, Mn:1.00 to 2.50%, P:0.005 to 0.050%, S:0.001 to 0.020%, and Al:0.005 to 0.100%, having a steel base material having a metallographic structure consisting of a ferrite phase and a second phase mainly containing martensite having an average particle diameter of 8 μm or less, and a sheet thickness t (mm) and a chemical component are adjusted to have C/0.2+Si/5.0+Mn/1.3+Cr/1.0+Mo/1.2+0.4 t-0.7(Cr+Mo)of 2.9 or less. |
