1. Under normal circumstances, inferior 4x4 galvanized square steel tube will show a folded state. The appearance of 4x4 galvanized square steel tube in this folded state is the main reason for this fold line. This shortcoming is often the longitudinal direction of the entire product. , and the reason for the folding is mainly due to the excessive pursuit of high efficiency by some manufacturers that do not meet the requirements, and such folding will occur when the pressing amount is too large, and if such a folded galvanized pipe is used Cracks may occur after bending, and such steel is not strong.
2. Some inferior 4x4 galvanized square steel tube will have pockmarks on the surface, and these pockmarks may be caused by the irregular and uneven surfaces of the production equipment used by the manufacturers of 4x4 galvanized square steel tube. Because the inferior galvanized pipe often makes the production equipment overrun, the appearance will appear pockmarked.
3. The surface of the inferior galvanized pipe is also prone to scarring, mainly because the production raw materials of the low-quality galvanized pipe are mostly uneven, and the impurities contained in it are relatively high. And most of the production equipment of low-quality galvanized pipe manufacturers is very simple, which can easily cause problems such as sticking steel, which will cause scars on the produced galvanized pipe.
4. Most of the low-quality 4x4 galvanized square steel tube will have cracks on the surface. The reason is that their blanks are soil cultured, and soil culture has more pores. During the cooling process of soil culture, due to the thermal stress received Cracks will occur in the galvanized pipe produced in this way.