Hot dip galvanized square pipe: it is a square pipe welded after crimping and forming with steel plate or steel strip, and on the basis of this square pipe, the square pipe is placed in the hot-dip galvanized pool and formed after a series of chemical reactions. Galvanized square pipe is divided into hot-dip galvanized square pipe and cold galvanized square pipe from the production process. It is precisely because of the different processing of the two galvanized square pipes that they have many different physical and chemical properties. Generally speaking, they have many differences in strength, toughness and mechanical properties.
The production process of hot-dip galvanized square pipe is relatively simple, the production efficiency is very high, and there are many varieties and specifications. This kind of square pipe requires little equipment and funds, which is suitable for the production of small galvanized square pipe manufacturers. The cold galvanized square pipe is used on the square pipe to make the square pipe have anti-corrosion performance by using the principle of cold galvanization. Different from hot-dip galvanizing, cold galvanizing coating mainly carries out anti-corrosion through electrochemical principle. Therefore, it is necessary to ensure full contact between zinc powder and steel, resulting in electrode potential difference, so steel surface treatment is very important. 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. 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.
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.