The specifications, models, and quality of the hot-dip galvanized square tube substrate should meet the requirements of the acceptance party, including the various chemical contents in the material book.
The appearance of the hot-dip galvanized square tube coating should be bright and smooth, with uniform color, and should have a complete galvanized layer. There should be no unplated black spots, leakage, peeling, sagging, burrs, agglomeration, or other phenomena.
The thickness of the hot-dip galvanized zinc layer should meet the range value specified by the acceptance party or meet the corresponding national standards.
Provide the acceptance party with the material book of the substrate, the galvanizing quality inspection report, and the corresponding certificate of conformity.
The packaging of hot-dip galvanized square tubes should be neat, beautiful, safe, and practical.

Hot-dip galvanized square tubes are generally judged to be qualified based on the appearance of the product. If the outer wall of the square tube has plating defects, pitting, white spots, heavy skin, bubbles, greening, etc., and the frequency of occurrence is too high, it is judged as an unqualified product. However, the product standard has a specified range for the allowable deviation of the product, which should meet the design requirements and relevant standards.

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