ZINC-COMPRISING-PLATED HIGH TENSION STEEL SHEET

摘要

The high tension steel sheet includes 0.1 wt% or more of silicon and has a zinc-plating layer thereon. When sputtering analysis is performed in the depth direction from the surface of the high tension steel sheet after the zinc-comprising-plating layer is removed by dissolution, a surface-concentrated Si index X defined by the formula, X = (the maximum intensity A of Si on the surface of the high tension steel sheet/the average intensity B of Si in the steel) x the content of Si in the steel sheet on a wt% basis, is 12 or less.