Galvanized square tubes are hollow square steel tubes with a square cross-section.
These are made from hot-rolled or cold-rolled galvanized steel strip or galvanized coil, cold-bent, and then high-frequency welded. Alternatively, they can be made from pre-made cold-bent hollow steel tubes that are then hot-dip galvanized.
Galvanized square tubes are divided into hot-dip galvanized and cold-dip galvanized types based on their production processes. These differences in processing lead to distinct physical and chemical properties. Generally speaking, they differ significantly in strength, toughness, and mechanical properties.
Hot-dip galvanized square tubes Hot-dip galvanized square tubes are made by welding steel sheet or strip after coiling. These square tubes are then placed in a hot-dip galvanizing bath and undergo a series of chemical reactions to form the tubes. The production process is relatively simple, highly efficient, and available in a wide variety of sizes. These square tubes require minimal equipment and capital, making them suitable for small galvanized square tube manufacturers. However, in terms of strength, this type of steel pipe is far weaker than seamless square pipe.
Cold-Dip Galvanized Square Pipe Cold-dip galvanized square pipe utilizes the cold-dip galvanizing principle to impart corrosion resistance to the square pipe. Unlike hot-dip galvanizing, cold-dip galvanizing primarily utilizes electrochemical corrosion protection. Therefore, sufficient contact between the zinc powder and the steel must be ensured to generate an electrode potential difference, making steel surface treatment crucial.
| Square tube specifications（mm） | Rectangular tube specifications（mm） | ||
| 16×16×0.4～1.5 | 380×380×8.0～14.0 | 10×20×0.6～1.5 | 250×150×6～12.0 |
| 18×18×0.4～1.5 | 400×400×8.0～14.0 | 14×21×0.6～1.5 | 250×100×6～12.0 |
| 20×20×0.4～1.5 | 420×420×10.0～14.0 | 15×30×1.5～1.5 | 250×200×6～12.0 |
| 25×25×0.6～2.0 | 450×450×10.0～14.0 | 15×38×0.6～1.5 | 300×150×6～12.0 |
| 30×30×0.6～4.0 | 480×480×10.0～14.0 | 20×30×0.6～2.0 | 300×200×6～12.0 |
| 34×34×1.0～2.0 | 500×500×10.0～14.0 | 20×40×0.8～2.0 | 300×250×6～12.0 |
| 35×35×1.0～4.0 | The specifications for the otherchanges are as follows | 20×50×1.0～2.0 | 400×250×8～12.0 |
| 38×38×1.0～4.0 | 550×550×10.0～40.0 | 22×35×0.9～2.0 | 400×300×8～12.0 |
| 40×40×1.0～4.5 | 600×600×10.0～40.0 | 25×40×0.9～3.75 | 450×200×8～12.0 |
| 44×44×1.0～4.5 | 700×700×10.0～40.0 | 25×65×1.0～2.0 | 450×250×8～12.0 |
| 45×45×1.0～5.0 | 800×800×10.0～50.0 | 30×40×1.0～3.75 | 400×300×8～12.0 |
| 50×50×1.0～5.0 | 900×900×10.0～50.0 | 30×45×1.0～3.75 | 400×350×8～12.0 |
| 60×60×1.5～5.0 | 1000×1000×10.0～50.0 | 30×50×1.0～4.0 | 500×200×10～12.0 |
| 70×70×2.0～6.0 | 30×60×1.0～4.5 | 500×250×10～12.0 | |
| 75×75×2.0～6.0 | 40×50×1.0～4.5 | 500×300×10～12.0 | |
| 80×80×2.0～6.0 | 40×60×1.0～5.0 | 500×350×10～12.0 | |
| 85×85×2.0～6.0 | 40×80×1.5～5.0 | 500×400×10～12.0 | |
| 95×95×2.0～8.0 | 40×100×2.0～5.0 | 500×450×10～12.0 | |
| 100×100×2.0～8.0 | 50×60×2.0～5.0 | The specifications for thechanges are as follows | |
| 120×120×4.0～8.0 | 50×80×2.0～5.0 | 600×200×10～28.0 | |
| 150×150×6.0～10.0 | 50×100×2.0～8.0 | 600×400×10～28.0 | |
| 180×180×6.0～12.0 | 60×80×2.0～6.0 | 600×500×10～28.0 | |
| 200×200×6.0～12.0 | 80×100×2.0～8.0 | 800×400×10～28.0 | |
| 220×220×6.0～14.0 | 120×60×2.5～10.0 | 800×600×10～28.0 | |
| 250×250×6.0～14.0 | 120×80×2.5～10.0 | 800×700×10～28.0 | |
| 280×280×6.0～14.0 | 150×100×2.5～12.0 | 1000×400×10～28.0 | |
| 300×300×8.0～14.0 | 180×150×2.5～12.0 | 1000×500×10～28.0 | |
| 320×320×8.0～14.0 | 200×100×4～12.0 | 1000×600×10～28.0 | |
| 350×350×8.0～14.0 | 200×150×4～12.0 | 1000×800×10～28 |
Differences Between Hot-Dip and Cold-Dip Galvanizing
Galvanized square pipes are classified into two categories: hot-dip galvanized square pipes and electrogalvanized square pipes. Hot-dip galvanizing can be performed using wet, dry, lead-zinc, and redox methods. The primary difference between hot-dip galvanizing methods lies in the method used to activate the pipe surface after acid cleaning to improve the quality of the galvanizing. The dry and redox methods are currently used in production, with their characteristics shown in the table. Electrogalvanized zinc coatings produce a very smooth, dense, and uniform zinc layer with excellent mechanical properties and corrosion resistance. Zinc consumption is 60% to 75% lower than hot-dip galvanizing. Electrogalvanizing is technically complex, but it is essential for single-sided coating, double-sided coating with different thicknesses on the inner and outer surfaces, and thin-walled tube galvanizing.
Applications of Galvanized Square Tubes
Galvanized square tubes are treated with zinc, significantly expanding their application range compared to square tubes. They are primarily used in curtain walls, construction, machinery manufacturing, steel construction projects, shipbuilding, solar panels, steel structures, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, and airports.
Characteristics of Galvanized Square Tubes
Galvanizing offers enhanced protection and corrosion resistance. The entire structure is composed of zinc, forming dense quaternary crystals that form a barrier on the steel plate, effectively preventing corrosion factors from penetrating. This corrosion resistance stems from the strong barrier layer protection provided by zinc. When zinc acts as a sacrificial protection on cut edges, scratches, and abrasions on the coating, it forms an insoluble oxide layer, fulfilling its barrier function.requirements for hydrostatic
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