Special for anti-corrosion and rust prevention of rectangular steel pipes used in hot-dip galvanized square tube structures for building curtain wall supports

Description :

  Galvanized square tube is a square section steel pipe that has been hot-dip galvanized or electroplated with zinc. It mainly solves the problem of corrosion and rusting of ordinary carbon steel in humid and outdoor environments. It combines the high strength of steel pipes with the excellent corrosion resistance of zinc layers, and is widely used in typical working conditions such as building structures, curtain wall engineering, machinery manufacturing, and agricultural greenhouse construction. As a basic building material, galvanized square tube not only has good load-bearing capacity, but also significantly extends its service life, reduces maintenance costs in the later stage, and is an indispensable key material in modern steel structure engineering.

  The specifications of this product range from a side length of 20mm to 400mm, with a wall thickness typically between 1.0mm and 12mm. Specific dimensions can be customized according to customer needs. The material is mostly made of low-carbon steel strips such as Q195, Q215, Q235B, etc., which comply with the standards of GB/T6728-2017 "Cold formed Hollow Steel for Structural Use" and GB/T13912-2020 "Technical Requirements for Hot Dip Galvanized Coating of Steel Parts with Metal Coating". The surface galvanized layer is uniform and has strong adhesion. The weight of the zinc layer is generally between 200-600g/m ², ensuring long-term anti-corrosion performance in harsh environments. Some products can be verified for their weather resistance through salt spray testing.

  When selecting, it is necessary to choose the appropriate wall thickness and cross-sectional size based on the actual stress situation. For columns or beams with large load-bearing capacity, it is recommended to use hot-dip galvanized square pipes with thicker wall thickness and Q235B or higher material; For decorative or non load bearing structures, thin-walled galvanized square tubes can be used to reduce costs. Attention should be paid to distinguishing between hot-dip galvanized and cold dip galvanized (electroplated zinc) products. The former has a thick zinc layer, long service life, and is suitable for outdoor use; The latter has a bright surface but a thin zinc layer, and is only suitable for indoor dry environments. When purchasing, the execution standards should be clearly marked to avoid passing off inferior goods as good.

  During the installation process, it is necessary to avoid severe collision damage to the galvanized layer. After cutting or welding, the damaged area should be repaired with zinc rich paint to prevent local corrosion from spreading. Daily maintenance only requires regular cleaning of surface dust and accumulated water, and checking for loose connection nodes. In coastal or high humidity areas, it is recommended to increase the frequency of inspections. If white rust or black spots are found on the surface, they should be treated promptly to prevent corrosion from penetrating into the substrate. Reasonable storage should be placed in a dry and ventilated place, with a moisture-proof pad at the bottom to avoid contact with other corrosive substances, in order to ensure the long-term stable use of galvanized square tubes.

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