The Square Hollow Structural Steel Column is a type of closed-section, box-shaped load-bearing upright. It represents the most cost-effective primary vertical support component for light-to-medium scale steel structure projects. Unlike the structural characteristics of H-beams—which typically exhibit directional load-bearing properties—this square steel column features a closed, welded cross-section. This design ensures balanced load-bearing performance in both directions, while offering a clean, square aesthetic and a lighter self-weight.
- Base Material Selection: We carefully select mainstream, high-quality structural steel plates—specifically Q235B and Q355B grades—available on the market. These raw materials feature low impurity levels; their toughness and structural strength fully comply with national construction standards, thereby eliminating potential future risks such as cracking or corrosion right from the source.
- Processing Workflow: The Square Hollow Structural Steel Column is fabricated using flat steel plates as raw material. These plates are bent and joined to form a closed square tube (box-section) profile. The columns undergo a rigorous finishing process involving precise cutting, mechanical straightening, welding of the base plate, drilling of connection holes, rust removal, and anti-corrosion surface coating.
- Structural Attributes: The closed box-section structure is compact and uniform overall. The column shaft remains perfectly straight with zero bending deviation, and internal stress distribution is uniform, enabling it to stably withstand both vertical compressive loads and lateral torsional forces.
- Standard Components: The finished square column body, a thickened solid steel base plate, and fixed stiffener plates.
- Auxiliary Materials: Custom-fabricated connection plates, high-strength fastening bolts, and connection gusset plates (lugs).
- Delivery Advantage: All components are manufactured concurrently as a unified set, ensuring perfect dimensional compatibility. There is no need to separately purchase additional accessories; the complete, ready-to-install package is delivered in a single shipment, allowing for immediate on-site installation.
- Light Industrial Buildings: Small to medium-sized steel-structure factories, warehouses, simple production workshops, and outdoor canopies.
- Prefabricated Temporary Facilities: Construction site modular housing, support columns for prefabricated site enclosures, and temporary construction platforms.
- Commercial & Civil Infrastructure: Low-rise commercial buildings, carports, small-scale steel landscape structures, and municipal support structures.
The closed-section square tube features similar moments of inertia in both directions, overcoming the inherent weakness of traditional open-section steel profiles (which typically exhibit anisotropic strength). This ensures that compressive, lateral-displacement, and torsional resistance capabilities are simultaneously maximized. Designers are relieved of the need to perform additional calculations for bi-directional load differentials, making the product suitable for various installation positions—including frame columns and perimeter load-bearing supports—and effectively simplifying the overall structural design scheme.
Under the premise of equivalent load-bearing capacity, the self-weight of the Square Hollow Structural Steel Column is significantly lower than that of H-beams or concrete columns. This not only reduces the cost of pouring foundations and alleviates the load on the underlying soil but also allows for the use of lighter hoisting equipment and reduces on-site labor costs. Consequently, it is highly suitable for small to medium-sized light steel structure projects with limited budgets.
The structural members are perfectly square and straight, featuring flat surfaces devoid of sharp, protruding edges, thereby ensuring strong visual uniformity. Whether utilized as exposed interior load-bearing columns or as exterior columns clad in decorative panels, they integrate seamlessly into the design, balancing structural functionality with architectural aesthetics to meet the aesthetic demands of commercial, residential, and landscape projects.
The finished products meet rigorous factory standards for both straightness and end-face flatness, and come complete with standardized pre-drilled holes and beveled edges. This ensures a high tolerance for alignment errors during on-site assembly, eliminating the need for construction personnel to perform time-consuming grinding or correction work. Even novice crews can complete assembly tasks quickly, thereby tangibly accelerating the overall construction schedule.
Tailored to various operating environments—including dry indoor spaces, exposed outdoor areas, and humid coastal regions—we offer three distinct anti-corrosion solutions: paint coating, hot-dip galvanizing, and pre-galvanized steel strip treatment. Clients can make their selection freely based on their project budget and intended operating environment, ensuring long-term resistance against oxidation, rainwater corrosion, and wind pressure erosion, thereby extending the service life of the steel columns.
We maintain a ready stock of various standard sizes while simultaneously offering non-standard customization services—including custom lengths, specific wall thicknesses, uniquely shaped cutouts, and specialized ear plate welding—to meet diverse project requirements. Smaller sizes are suitable for applications such as small canopies and prefabricated structures, while larger sizes are capable of handling the heavy-load demands of medium-scale industrial plants, thereby comprehensively covering procurement needs across different project tiers.
Our Square Hollow Structural Steel Columns are processed using CNC cutting equipment to ensure precise sizing of plates and tubes. We strictly control the perpendicularity of the end faces, resulting in smooth, burr-free cut sections devoid of edge chipping issues, thereby guaranteeing the alignment precision of the structural members right from the source.
Each column is uniformly fitted with a thickened, solid base plate. We employ a circumferential, full-penetration welding process to ensure dense, robust weld seams. This eliminates quality defects such as incomplete fusion or slag inclusions, thereby reinforcing the structural stability of the column base-to-foundation connection and preventing base plate detachment under heavy-load conditions.
Adhering strictly to construction blueprints, we execute precise customization procedures—including drilling connection holes, welding attachment ear plates, and milling end bevels—with all processing parameters benchmarked against national standards to ensure seamless alignment between bolts and plates during on-site assembly.
In accordance with the specified anti-corrosion plan, we employ a combination of mechanical cleaning and shot blasting techniques to thoroughly remove mill scale and rust layers from the steel surface. Immediately following rust removal, we apply a multi-layer coating system—consisting of primers and topcoats—or perform hot-dip galvanization to prevent secondary rusting of the base material.
- Specification for Cold-Formed Closed Structural Steel Sections: GB/T 6728
- Standard for Design of Steel Structures: GB 50017-2017
|
Material |
Yield Strength |
Tensile Strength |
Elongation After Fracture |
Low-temperature Impact Energy |
|
Q235B |
≥235MPa |
375~500MPa |
≥26% |
≥27J |
|
Q355B |
≥355MPa |
470~630MPa |
≥20% |
≥34J |
- Standard Side Lengths: 40×40mm, 50×50mm, 60×60mm, 80×80mm, 100×100mm, 120×120mm, 150×150mm, 200×200mm;
- Compatible Wall Thicknesses: 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 8.0mm;
- Standard Lengths: 2m–12m; supports custom cutting to any specified length range with no minimum order threshold for custom lengths.
- Sectional Area: 1536 mm² (15.36 cm²)
- Theoretical Unit Weight: 12.06 kg/m
- Structural Characteristics: Balanced bi-directional bending and torsional resistance; excellent stability under axial compression; suitable for the vast majority of light-frame structural applications.
- Structural Advantages: Features a closed box-section structure; offers superior resistance to lateral displacement and torsion compared to open-section steel profiles, effectively mitigating lateral wind pressure and external seismic forces.
- Design Thresholds: Component slenderness ratio (λ) ≤ 150; this value meets the critical design limits ("red lines") for light-gauge steel in civil construction and for medium-scale industrial buildings, making it suitable for the design standards of various load-bearing frame columns.
- Dimensional Deviation: Deviations in side length and wall thickness strictly adhere to the limits prescribed by national standards for cold-formed steel sections.
- Straightness Accuracy: The overall straightness of the structural member shall be ≤ 1/1000 of its total length, effectively eliminating issues such as twisting or skewing.
- End Face Requirements: Cut end faces are maintained to be perfectly level and perpendicular—free from tilting or indentation—thereby ensuring a precise fit during installation.
- Spray Coating: Features a dual-layer application of primer and topcoat, with a controlled dry film thickness of 80–120 μm. This option is ideally suited for dry indoor environments, offering the optimal balance of performance and cost-effectiveness.
- Hot-Dip Galvanizing: Boasts a zinc coating thickness of ≥ 65 μm, providing maximum resistance to oxidation and corrosion. Under outdoor, open-air conditions, this treatment ensures a service life of 8 to 15 years.
- Pre-Galvanized Strip Square Tubing: The base material itself features a pre-applied zinc coating, offering stable, foundational rust-prevention properties. This makes it the cost-effective choice for simple, light-gauge steel construction projects.
Our Square Hollow Structural Steel Columns are engineered to operate stably over the long term within a temperature range of -20°C to +60°C. Inherently resistant to seismic forces and wind pressure, they remain unaffected by extreme high or low temperatures. These columns are suitable for deployment in a wide variety of settings, including enclosed indoor spaces, open-air outdoor environments, and humid coastal regions.
As a seasoned domestic manufacturer of Square Hollow Structural Steel Columns, HAISHENG operates five state-of-the-art intelligent production bases located across Tianjin, Fujian, Shandong, and Hubei. We independently manage the entire production lifecycle—from cutting, welding, and deep processing to anti-corrosion treatment—ensuring a direct-to-customer supply chain free of intermediary markups. Whether for small-batch purchases or large-volume container exports, we offer buyers genuine, rock-bottom ex-factory pricing, thereby enabling effective control over project procurement budgets.
We have established a comprehensive, end-to-end quality inspection mechanism spanning the entire process—from the receipt of raw materials to the dispatch of finished products. Raw materials are individually verified against their material certificates; during the production phase, we conduct spot checks on dimensions and perform non-destructive testing on weld seams; finally, all finished products undergo unified inspections to verify straightness and the thickness of the anti-corrosion coating. All products strictly adhere to national standards GB/T 6728 and GB 50017-2017. We rigorously eliminate quality issues such as deformation, poor welding, and corrosion, thereby helping clients avoid—at the source—troubles like on-site installation rework and failure to pass project acceptance inspections.
Unlike typical single-product suppliers, we can execute non-standard cutting, custom hole punching, ear plate welding, and specialized anti-corrosion treatments based on construction drawings. We supply standard square hollow section columns from stock—ideal for canopies, warehouses, and simple structural projects—while also offering custom heavy-duty box-section columns to meet the demands of complex projects, such as medium-sized factories and high-rise auxiliary steel structures. This provides a one-stop solution that satisfies both standardized procurement and personalized customization needs.
With years of deep expertise in the steel structure export industry, we maintain a dedicated overseas project team well-versed in the engineering procurement standards of regions including Southeast Asia, Central Asia, Africa, and South America. We provide complete customs clearance documentation, quality inspection certificates, and material reports. We support customized export packaging and utilize stable cross-border logistics channels, while also offering multilingual technical support to simplify the procurement and delivery process for our international clients.
Pre-sales services include assistance with specification selection and load matching; during the sales process, we provide real-time updates on production and shipping status; and post-sales, we offer free installation guidance and troubleshooting support. For any quality issues inherent to the product itself, we provide warranty and maintenance services. Furthermore, we offer long-term technical support to our partners, including assistance with structural modifications and component replacements.
1. Q: How do I choose between square hollow section steel columns and H-beam steel columns?
A: Square Hollow Structural Steel Columns distribute loads evenly in two directions, feature a clean aesthetic, are lighter in weight, and offer superior cost-effectiveness. They are best suited for light-to-medium-sized factories, warehouses, outdoor canopies, carports, prefabricated modular buildings, and low-rise civil structures. H-beam columns, conversely, are better suited for high-rise, large-span, and heavy-duty industrial buildings. Clients can make their selection flexibly based on specific load requirements and budget constraints.
2. Q: How should I choose between Q235B and Q355B steel grades?
A: Q235B material offers lower costs and excellent toughness, making it fully adequate for light-load projects such as canopies, prefabricated housing, and small warehouses. Q355B is a high-strength material with superior compressive and load-bearing capabilities, making it suitable for medium-scale steel structure projects involving heavy-load industrial plants, outdoor areas subject to high wind pressure, and coastal regions prone to corrosion.
3. Q: Which anti-corrosion processes are best suited for specific application scenarios? What is the warranty period?
A: For dry indoor environments, spray coating is recommended as it offers the best cost-effectiveness. For standard outdoor conditions, hot-dip galvanizing is the preferred choice, providing a service life of 8 to 15 years. For simple, temporary structures, square tubing made from galvanized strip steel is a viable option. Under normal operating conditions—and barring man-made damage—spray-coated products carry a warranty of 1 to 3 years, while hot-dip galvanized products come with a warranty of 5 to 8 years.
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Tianjin International Metal Logistics Park, Jinan Economic Development Zone (East Zone), Jinan District, Tianjin, China
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