There are many kinds of steel in the steel market. If you want to say which kind of steel is more commonly used, it must be galvanized square tube.
Galvanized square pipe is a kind of hollow square cross-section steel pipe with square cross-section shape and size made by cold bending and high-frequency welding with hot-rolled or cold-rolled galvanized steel strip or galvanized coil plate as blank, or galvanized square pipe made in advance by hot-dip galvanizing. Jinan galvanized square tube below talk about the hot galvanized square tube and cold galvanized square tube distinguish way.
Jinan galvanized square pipe
Hot dip galvanized square tube has wet method, dry method, lead-zinc method, oxidation-reduction method and so on.
The main difference of different hot dip galvanizing methods is how to activate the surface of pipe body to improve the quality of galvanizing after pickling. Dry process and redox method are mainly used in production, and their characteristics are shown in the table.
The results show that the surface of zinc coating is very smooth and compact, the structure is uniform, the mechanical properties and corrosion resistance are good, and the zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing.
The technology of electro galvanizing is complex, but it is necessary to use this method for single side coating, double-sided coating with different thickness of inner and outer surface, and thin-walled tube galvanizing.