Zinc aluminum magnesium square tube, corrosion-resistant high-strength structure, square rectangular tube, dedicated for building photovoltaic brackets

Description :

  Zinc aluminum magnesium square tube is a high-strength square steel tube coated with zinc aluminum magnesium alloy, which mainly solves the problems of corrosion and short service life of traditional galvanized square tubes in harsh environments. It forms a dense self-healing protective film by introducing aluminum and magnesium elements, significantly improving its resistance to incision corrosion and scratch resistance. Typical working conditions include outdoor photovoltaic brackets, highway guardrails, agricultural greenhouse skeletons, and building structures in coastal high salt spray areas. This product combines the high strength of steel with the excellent corrosion resistance of alloy coating, suitable for long-term service scenarios with high weather resistance requirements, and can effectively reduce maintenance costs throughout the entire lifecycle.

  The specifications and dimensions of zinc aluminum magnesium square tubes usually range from 20mm to 300mm in side length and 1.5mm to 12mm in wall thickness, and can be customized according to customer needs. The weight of the coating is generally between ZM180-ZM600g/m ², with an aluminum content of about 1.5% -3.5% and a magnesium content of about 0.1% -0.3%. The execution standards mostly refer to international standards such as GB/T 6725-2017 "Cold formed Steel" or JIS G 3323, and some high-end products have passed ISO 9001 quality system certification. The production process adopts high-frequency welding followed by online or offline hot-dip coating to ensure uniform and complete coating at the weld seam. The material substrate is mostly low carbon steel or low-alloy high-strength steel such as Q235B and Q355B, ensuring good formability and weldability.

  When selecting, it is important to consider the corrosion level of the operating environment and the structural stress requirements. In C4 and above highly corrosive environments (such as beaches and chemical plants), zinc aluminum magnesium square tubes have significant advantages over ordinary hot-dip galvanized square tubes, and their lifespan can be extended by 2-3 times. If only used in indoor dry environments, ordinary galvanized square pipes have a higher cost-effectiveness. Pay attention to distinguishing between zinc aluminum magnesium and aluminum zinc coated products. The former has better notch protection, while the latter has better heat resistance. For load-bearing structures, it is necessary to verify whether the yield strength of the steel meets the design load, in order to avoid focusing only on the coating and neglecting the strength of the substrate. Similar categories such as stainless steel square tubes, although corrosion-resistant, have extremely high costs, and zinc aluminum magnesium square tubes are their economical alternative.

  When installing zinc aluminum magnesium square tubes, it is recommended to use matching stainless steel or Dacromet treated fasteners to avoid electrochemical corrosion. Cutting the section does not require additional painting, and its self-healing properties can provide continuous protection. However, it is recommended to apply zinc rich paint to repair severely scratched areas. Daily maintenance only requires regular cleaning of surface dust and dirt, and checking for loose connection nodes. The typical service life can reach 20-30 years outdoors without significant corrosion. Common faults are often caused by mechanical damage during transportation or improper welding during installation, resulting in the burning of the coating. During construction, low-temperature welding technology or reserved welding areas should be used for overall anti-corrosion treatment to ensure durability.

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