Hot dip galvanized square tube: steel plate orSteel beltA square tube formed by welding a square tube after crimping and placing the square tube in a hot-dip galvanizing bath after a series of chemical reactions. Hot dip galvanized square tube production process is relatively simple, and the production efficiency is very high, the variety specifications are also many, this kind of square tube needs little equipment and capital, suitable for the production of small galvanized square tube manufacturers. But in terms of strength, the strength of this kind of steel pipe is far lower than thatSeamless square tube.

And cold galvanized square pipe is in useSquare tubeThe principle of cold galvanizing is used to make the square pipe anti-corrosion. Different from hot galvanizing cold galvanizing coating mainly through the principle of electrochemistry to anticorrosive, so it must ensure the zinc powder and steel enough contact, the potential difference of the electrode, so the steel surface treatment is very important.

galvanizedSquare tubeHot dip galvanized square tube and galvanized square tube two categories. Hot - dip galvanized square pipe wet, dry, lead - zinc method, such as oxidation - reduction method. The main difference of different hot dip galvanizing methods is in what method to activate the surface of the pipe body to improve the quality of galvanizing after the acid dip cleaning of the steel pipe. The main production methods are dry method and REDOX method, the characteristics of which are shown in the table. The surface of the zinc layer of electroplating is very smooth and dense with uniform structure. Good mechanical properties and corrosion resistance; Zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing. Electroplating has certain technical complexity, but it is necessary to use this method for single coating, double-sided coating with different coating thickness on inner and outer surfaces, and thin-walled tube galvanizing.