Galvanized square pipe

Galvanized square pipe is a kind of hollow square section steel pipe with square section shape and size made of hot-rolled or cold-rolled galvanized steel strip or galvanized coil after cold bending and forming, and then high-frequency welding, or galvanized square pipe made of cold-formed hollow steel pipe in advance and hot-dip galvanizing.

Use

Because the galvanized square pipe is galvanized on the square pipe, the application scope of galvanized square pipe has been greatly expanded compared with square pipe. It is mainly used for curtain wall, construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation support, steel structure engineering, power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, etc.

Characteristics

Galvanizing has stronger protective effect and strong corrosion resistance. The whole structure is made of zinc to form a dense quaternary crystal, which forms a barrier on the steel plate, so it can effectively prevent the penetration of corrosion factors. Corrosion resistance comes from the barrier layer of zinc, with strong protection function. When zinc makes sacrificial protection on the cutting edge, scratch and coating scratch, zinc forms an insoluble oxide layer to play the role of barrier protection.

Galvanized square tubes include hot-dip galvanized square tubes and electro galvanized square tubes. Hot dip galvanized square tubes include wet method, dry method, lead-zinc method, oxidation-reduction method, etc. The main difference between different hot-dip galvanizing methods is what method is used to activate the pipe surface and improve the galvanizing quality after acid leaching cleaning of steel pipe. At present, dry process and redox process are mainly used in production, and their characteristics are shown in the table. The surface of the zinc layer is very smooth, dense and uniform; Good mechanical properties and corrosion resistance; The zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing. Electro galvanizing has certain technical complexity, but this method must be used for single-sided coating, double-sided coating with different thickness of internal and external surface coating, and thin-wall pipe galvanizing.