HIGH TENSION ALLOYED MOLTEN ZINC-PLATED STEEL PLATE HAVING EXCELLENT PLATING CHARACTERISTICS AND METHOD OFF MANUFACTURING THE SAME

摘要

A high tension alloyed molten zinc-plated steel plate having excellent press moldability and plating characteristics, wherein Si is utilized as a reinforcing component, the mutual relation between Si and Mn being specified, an alloying rate of a layer of plating of alloyed zinc being specified, characterized in that: the plated steel has a layer of plating of alloyed molten zinc containing 9-12 % of Fe on a surface of a steel plate containing 0.0005-0.0050 mass % of C, 0.1-2.5 mass % of Si, 0.1-2.5 mass % of Mn, 0.003-0.10 mass % of Ti, 0.0030-0.10 mass % of Nb, 0.0005-0.0080 mass % of B, 0.040-0.18 mass % of P, not more than 0.015 mass % of S, 0.005-0.10 mass % of Al, not more than 0.0060 mass % of N, Si and Mn in amounts satisfying the relation of the following expression, and the remainder substantially comprising an Fe composition.