| abstract |
[PROBLEMS] To provide a tensile strength of 340 MPa or more having press formability applicable to the automotive field, particularly fuel tank use, excellent secondary work brittleness resistance, excellent seam weld low temperature toughness, and excellent corrosion resistance. An Sn-Zn plated high-strength steel sheet and a method for producing the same are provided. In mass%, C: 0.0005 to 0.0050%, Si: more than 0.3 to 1.0%, Mn: 0.70 to 2.0%, P: 0.05% or less, Ti: 0.010-0.050%, Nb: 0.010-0.040%, B: 0.0005-0.0030%, S: 0.010% or less, Al: 0.01-0.30 %, N: 0.0010 to 0.01%, and the remainder is pickled at the pickling time corresponding to the finishing rolling temperature at the time of pickling of the hot-rolled steel sheet containing Fe and inevitable impurities, and the Si surface After the concentration exceeds 0.3 to 1.5%, cold rolling, annealing, and Sn—Zn plating are performed. [Selection] Figure 2 |