The commonly available square tubes on the market are mostly formed by welding steel strips, which have the potential weakness of weak weld seams. In contrast, the Hot dip Galvanized Seamless Square and Rectangular Steel Tube supplied by Shixinda Supplier are seamless in their base material and are forged as a whole. They do not have welding seams, and their overall mechanical properties are significantly superior to welded galvanized square and rectangular tubes.
The application scenarios of the two galvanizing processes are clearly divided. The hot-dip galvanizing process has sufficient zinc layer thickness and strong adhesion, making it suitable for long-term outdoor use; while the electro-galvanizing process has a thinner zinc layer and is only suitable for short-term use in indoor dry and non-corrosive environments. The product cross-section is divided into two categories: square and rectangular. Customized non-standard length and width dimensions can be provided as needed, and they are suitable for diverse engineering and mechanical manufacturing requirements.
Structural load-bearing components: steel structure frame, equipment base, photovoltaic support, engineering column, mechanical frame, replacing ordinary profiles to enhance structural strength;
Fluid transportation pipelines: low-pressure water supply and drainage, chemical mild corrosive media, fire-fighting water supply, seamless structure eliminates leakage;
Outdoor anti-corrosion components: municipal guardrails, curtain wall framework, greenhouse framework, transportation facilities, relying on galvanized layer to resist sun exposure, rain, acid and alkali corrosion;
Mechanical processing accessories: construction machinery arm, equipment support beam, conveying support, capable of cutting, drilling, and bending for secondary processing.
No weld seams, integrated molding, no cracking under high pressure and heavy load conditions, tensile and compressive strength far exceeding that of welded pipes;
Uniform wall thickness, high dimensional accuracy, less prone to deformation, stable welding and assembly processing.
Thick galvanized zinc layer is dense and complete, covering both inner and outer walls, preventing moisture, salt, and rainwater. Outdoor service life can reach 10–20 years;
The zinc layer has self-healing properties. When the pipe is slightly bumped or scratched, an oxide protective film forms on the zinc layer, making it less prone to rust and perforation;
No need for painting, reducing the need for rust removal and anti-corrosion coating processes, significantly lowering labor and maintenance costs.
High strength, low self-weight, hollow cross-section reduces weight compared to solid steel, reducing overall engineering load and transportation costs;
Suitable for multiple scenarios: indoor/outdoor, above-ground/buried, suitable for low-temperature, mild acid and alkali corrosion;
Strong processing plasticity, capable of cutting, drilling, bending, welding, flange connection, meeting customized engineering requirements;
Flat and galvanized silver-gray appearance, aesthetically pleasing without additional painting, ready for direct installation and use.
Compared to black seamless square pipes: no on-site anti-corrosion required, zero maintenance later; Compared to galvanized welded square pipes: double the pressure-bearing, seismic resistance, and durability, suitable for heavy-duty, long-term outdoor projects.
Unfinished square tubes (side length mm)
20×20, 25×25, 30×30, 40×40, 50×50, 60×60, 80×80, 100×100, 120×120, 150×150, 200×200, 250×250, 300×300
Unfinished rectangular tubes (length × width mm)
30×20, 40×20, 40×30, 50×30, 50×40, 60×40, 80×40, 80×60, 100×50, 100×80, 120×60, 120×80, 150×100, 200×100
2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 8.0, 10, 12, 14, 16. Thin walls are mainly used for decoration and lightweight supports; thick walls are used for load-bearing columns and high-pressure fluid transportation.
Fixed lengths of 6 meters / 9 meters / 12 meters, and support custom cutting of non-standard lengths.
Base material seamless tubes: GB/T 8162 (Structural Seamless Steel Pipes), GB/T 8163 (Seamless Steel Pipes for Fluid Transportation) Galvanizing process: GB/T 13912 Technical requirements for metal coating hot-dip galvanizing layer
1. In the steel structure engineering field: factory building load-bearing frames, heavy equipment base supports, high-rise curtain wall supporting columns, large-scale photovoltaic supports, etc. These are supported by seamless structures to bear heavy loads.
2. In fluid transportation systems: low-pressure water supply pipelines in the factory area, ordinary fire-fighting water pipelines, mild corrosive chemical liquid transportation pipelines. The seamless pipe walls completely eliminate the risk of liquid leakage.
3. In municipal outdoor facilities: Hot dip Galvanized Seamless Square and Rectangular Steel Tube can be used for road protection guardrails, overall frameworks of greenhouses, and supporting components of traffic signs. The galvanized layer resists outdoor wind, frost, rain, and rust.
4. In mechanical equipment manufacturing: support arms for construction machinery, conveyor line support brackets, fixed frames for machine tools, etc. After secondary processing, they are used as core load-bearing components.
1. Process selection distinction: For outdoor open-air, humid, and slightly corrosive environments, uniformly select hot-dip galvanized seamless square and rectangular steel tubes; for indoor dry and no high-load pressure requirements, only the electro-galvanized style can be chosen.
2. Load-bearing and pressure matching: For heavy steel structures and fluid transportation scenarios, seamless base materials are preferred. It is prohibited to use welded square tubes as a substitute to avoid problems such as weld seam cracking and leakage during long-term use.
3. Specification customization requirements: Customization is available for cross-sectional length and width, pipe wall thickness, and the entire length. For heavy-load conditions, it is recommended to add a thicker pipe wall to enhance the overall structural stability.
4. Quality inspection verification: During purchase, check the flaw detection report of the pipe material's seamless base material and the proof of zinc layer thickness. Qualified products have a uniform zinc layer distribution without defects such as lack of coating, peeling, or burrs.
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