Hot-dip galvanized square tubes are used forSteel PlateOrSteel StripAfter being curled and formed, the square tubes are welded and then undergo a series of chemical reactions in a hot galvanizing pool to form the finished product; they can also be...Hot RollingOr cold-rolled galvanized steel strips are cold-bent thereafter.High-frequency WeldingA hollow square-section steel tube produced by a certain method. The production process of the tube is simple, with high efficiency, a wide variety of specifications, and low equipment investment, but it generally has lower strength.Seamless Square Tube。