The seamless galvanized Square tube is a square cross-sectional shape that can be cold-rolled and hot-rolled with two different galvanized steel strips or galvanized coils as blanks, formed by cold bending, and then welded by high-frequency welding. The hollow square section steel tube. It can also be a galvanized rectangular tube made of cold-formed hollow steel pipe prepared in advance and then processed by hot-dip galvanizing.
So what is the difference between hot-dip galvanized square tube and cold-dip galvanized square tube?
Hot-dip galvanized square pipes include wet method, dry method, lead-zinc method, redox method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the surface of the pipe body to improve the quality of galvanizing after the acid immersion cleaning of the steel pipe. Dry method and redox method are mainly used in production.
Cold galvanizing, that is, the surface of the galvanized zinc layer is very smooth and dense, with uniform structure; it has good mechanical properties and corrosion resistance; the zinc consumption is 60% to 75% lower than that of hot galvanizing. Electro-galvanizing has certain technical complexity, but this method must be used for single-sided coating, double-sided coating with different inner and outer surface coating thicknesses, and thin-walled pipe galvanizing.
