| abstract |
A welded H-section steel having both corrosion resistance and appearance is provided. Each of a web 12 and a flange 14 is laminated with a base material 12a, 14a and a base material, Zn-Al-Mg-Si based alloy plating, Zn-Al-Mg based alloy plating, and Any one type 12b and 14b of Zn-Al type alloy plating, and the chemical conversion treatment film 12c and 14c which are laminated | stacked on plating and contain organic substance are included. The thickness of the chemical conversion coating determined as the distance from the surface of the chemical conversion coating to the position where the amount of carbon in the depth direction measured by glow discharge optical emission spectrometry becomes 1/10 of the maximum value is 0.1-0. 7 μm. [Selection] Figure 3 |