In brief, the centralized classification of galvanized square tubes can be divided into hot galvanized square tubes and cold galvanized square tubes. It is precisely because of the different addition of these two galvanized square tubes that many different physical and chemical properties of them are created. Generally speaking, they differ in strength, endurance and mechanical function. Hot-dip galvanized square pipe: a square pipe which is welded by bending of steel plate or strip and placed in a hot-dip galvanizing bath at the root of the square pipe after a series of chemical reactions. The production process of hot-dip galvanized square tubes is relatively simple, and the output power is very high, and there are many kinds of standards. The square tubes require little equipment and capital, which is suitable for the production of small-scale galvanized square tubes manufacturers. But in terms of strength, the strength of this kind of steel pipe is far lower than that of seamless square pipe. ??而冷镀锌方管是在所用的方管上使用冷镀锌的原理来使方管具有防腐蚀的功能。与热镀锌不同冷镀锌涂料首要经过电化学原理来进行防腐，因而必须保证锌粉与钢材的充分触摸，发生电极电位差，所以钢材外表处理很重要。
And the cold galvanized square pipe is to use the principle of cold galvanizing on the square pipe used to make the square pipe have the function of anti-corrosion. Different from hot-dip galvanizing, cold-dip galvanizing coatings are mainly anticorrosive by electrochemical principle. Therefore, it is necessary to ensure the full touch between zinc powder and steel, and the potential difference between electrodes occurs. Therefore, the surface treatment of steel is very important.
Difference between_cold and hot galvanizing
_galvanized square tubes can be divided into hot galvanized square tubes and galvanized square tubes. Hot-dip galvanized square pipe has wet method, dry method, lead-zinc method, oxidation-reduction method and so on. The primary difference between different hot-dip galvanizing methods is how to activate the outside surface of the pipe to improve galvanizing quality after acid leaching cleaning. Dry method and redox method are the most important methods in production. Their characteristics are shown in the table. The zinc coating of galvanizing is very smooth, compact and uniform in structure. It has excellent mechanical function and corrosion resistance. The consumption of zinc is 60%-75% lower than that of hot galvanizing. Electroplating zinc is technically complicated, but it is necessary to select this method for single-side coating, double-sided coating with different thickness of inner and outer coating, and thin-walled tube galvanizing.
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