Beijing Weihong Xinglong Steel Co., Ltd. for illustrative galvanized square tube products, cold and hot processing performance and corrosion resistance are good, with a good low-temperature toughness, galvanized square tube is a kind of a hot-rolled or cold-rolled galvanized ingot steel or galvanized coil through cold bending by high frequency welded after forming a square cross-sectional shape and size of the hollow square-section steel pipe; or well in advance of the cold-formed hollow steel pipe and then by hot dip type galvanizing the processing of galvanized Rectangular Pipe. Galvanized square tube galvanized square tube: in the use of steel sheet or strip coiled square tube welded after forming and will be the basis of this square tube square tube in the pool after a hot-dip galvanizing A series of chemical reactions party after the formation of the tube. Galvanized square tube production process is relatively simple, and the production efficiency is very high, also many different specifications, equipment and funds needed for this little square tube, galvanized square tube manufacturers for small production. But the strength is the strength of this is far below the seamless steel pipe square tube. Cold galvanized square tube and cold galvanized square tube is on the side of the tube used in principle to the use of cold galvanized square pipes with anti-corrosion properties. And hot-dip galvanizing cold galvanizing paint a different principle primarily through electrochemical corrosion protection, it is necessary to ensure full access to zinc and steel, generating electrode potential difference, so the steel surface treatment is very important. The difference between hot and cold galvanized galvanized square tube with hot galvanized square pipe and galvanized square tube into two categories. Galvanized square tubes have wet, dry, lead and zinc method, redox method. The main difference between the different methods of hot-dip galvanized steel pickling after cleaning, the method used to improve the activation of galvanized pipe surface quality. Production is now mainly dry method and redox method, which features table. Galvanized zinc coating surface is very smooth and dense, uniform organization; has good mechanical properties and corrosion resistance; zinc consumption 60% to 75% lower than the hot-dip galvanizing. Galvanized technically some complexity, but the single-sided coating, different coating thickness of the inner and outer surfaces of the double-sided coating, and thin-walled tube galvanized mused shall use this method.