Galvanized square tubes are easily identifiable by their appearance. Although the processing technology for galvanized square tubes is relatively simple, the performance of the tubes after forming, in terms of both strength and toughness, is significantly improved, far surpassing that of regular square tubes. Moreover, they can withstand environmental oxidation corrosion, making them widely applicable in construction projects.

Quality is easily discernible by appearance. If the galvanized layer on the square tube is uneven over a large area, the square tube can be deemed不合格.

Inspect the surface for issues such as insufficient coating, pitting, and white spots. The quality of galvanized pipe material is poor, or the processing during galvanization is not standardized, overall indicating poor quality of the galvanized pipe.

The galvanized layer has bubbles and contains a faint green hue, which may indicate that the quality of the galvanized layer does not meet the standards. The square tube manufacturer judges according to the above method.