1) Both the inner and outer walls of the hot-dip galvanized steel pipe are galvanized, while the cold-galvanized steel pipe is only galvanized on the outer wall.
2) The cold plating layer is uniform and the thickness is very thin; the hot plating layer is thick and the thickness is not uniform.
3) The appearance of cold plating is bright and the color of hot plating is dark.
4) Because the cold plating layer is thin, the corrosion resistance is poor; the hot plating layer is several times times thicker than the cold galvanizing, and the infiltrated layer is formed with the base metal, and the corrosion resistance is good.
5) The cold-galvanized steel pipe looks brighter and smoother; the hot-dip galvanized steel surface is not cold-plated and bright, and the surface of the hot-dip galvanized steel pipe looks like some uneven bumps, and the surface is not bright, not reflective.
Post time: May-27-2020