ALLLAND Boiler Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Factory, specializing in the production of Square Hollow Sections. Our factory utilizes premium carbon steel as raw material, employing high-end production equipment to achieve one-time manufacturing. Comprehensive inspection techniques and instruments ensure product quality meets standards. Square Hollow Sections offer outstanding structural performance and are widely used in construction, bridge building, machinery, and equipment industries. Uniform stress distribution, excellent bending resistance, and stable welding are key advantages of our SHS steel pipes. Inquiries are welcome.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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A Square Hollow Section is a structural steel tube with a square cross-section and a hollow interior, also known as “SHS.” Manufacturers produce Square Hollow Section from steel material by cold bending, welding, and hot rolling, and it possesses high load-bearing capacity and excellent mechanical properties.
O.D.:
20 mm – 500 mm
W.T.:
1.5 mm –30 mm
Length:
6 m / 12 m
Process:
Cold-formed welding, hot forming
Standards:
EN 10219/ EN 10210/ ASTM A500/ GOST 30245
Steel Grades:
S235, S275, S355/ Grade B, Grade C/ 09G2S/ Q235, Q355
Surface Treatment:
Black pipe, galvanized, painted, powder-coated
Tube Ends:
Butt-welded, chamfered, cut, cut-to-length, drilled
The following table presents specifications for Square Hollow Sections with a standard length of 6 meters.
| (OD) (mm) | (WT) (mm) | Length (m) | Cross-Sectional Area (cm²) |
| 20×20 | 1.5 | 6 | 1.98 |
| 25×25 | 1.5 | 6 | 2.48 |
| 30×30 | 2 | 6 | 3.74 |
| 40×40 | 2 | 6 | 4.96 |
| 50×50 | 2.5 | 6 | 6.98 |
| 60×60 | 3 | 6 | 9.92 |
| 70×70 | 3 | 6 | 11.48 |
| 80×80 | 3.5 | 6 | 13.88 |
| 100×100 | 4 | 6 | 19.6 |
| 120×120 | 4.5 | 6 | 23.76 |
| 150×150 | 5 | 6 | 35.16 |
| 200×200 | 5 | 6 | 51.2 |
| 250×250 | 6 | 6 | 78.54 |
| 300×300 | 6 | 6 | 107.54 |
| 350×350 | 7 | 6 | 137.56 |
| 400×400 | 7 | 6 | 157.72 |
Notes:
OD: Outside Diameter (unit: mm).
WT: Wall Thickness (unit: mm). The uniform thickness of the tube wall is a key parameter determining load-bearing capacity and must comply with standard tolerances.
Cold Forming
This process involves shaping steel plates or strips using a cold-forming machine, followed by welding to finalize the shape. It offers high dimensional accuracy and is suitable for products requiring precise tolerances, such as furniture and decorative elements.
Hot Forming
This method involves heating the steel to a high temperature to soften it before shaping. It can produce products with greater wall thickness and larger dimensions, commonly used in load-bearing structures, bridges, and construction projects.
Surface Treatment
Treatments such as galvanizing, powder coating, or painting enhance corrosion resistance and improve appearance. Electroplating or hot-dipping forms a protective zinc layer on the surface effectively preventing oxidation and corrosion.
The square cross-section effectively distributes and transfers force, giving Square Hollow Section higher bending stiffness and load-bearing capacity under longitudinal and transverse pressures compared to other tube shapes. This makes it particularly suitable for support, frameworks, and columns in building structures.
The symmetrical geometry and uniform wall thickness ensure structural stability in all directions, providing excellent resistance to deformation under both longitudinal and transverse pressures.
The sleek and tidy appearance of Square Hollow Section is suitable for building facades, interior decoration, and furniture manufacturing, enhancing overall design aesthetics. Its square cross-section also allows for efficient space utilization in applications with spatial constraints.
The smooth surface minimizes the accumulation of corrosive agents. Anti-corrosion treatments like galvanizing or powder coating enable Square Hollow Section to withstand harsh environments, extending its service life, especially in marine or chemical industrial settings.
The hollow design makes Square Hollow Section lighter than solid steel bars of equivalent strength, facilitating transportation and installation, and helping to reduce overall construction costs.
Square Hollow Section is easy to process, supporting various methods including cutting, welding, and other secondary fabrication. It also accommodates multiple connection methods such as bolting and welding.
Under equivalent strength requirements, Square Hollow Section can reduce material usage and construction costs, while also having low maintenance costs.
As technology advances, the manufacturing processes and materials for Square Hollow Sections will continue to innovate. Future development will likely follow these directions:
Green and High-Performance Materials: Driven by increasing environmental requirements and sustainable development trends, the Square Hollow Section industry will increasingly adopt eco-friendly, high-strength steels. These materials are needed to meet demands for energy saving, emission reduction, and high performance.
Customization and Flexible Production: Future Square Hollow Section production will become more flexible, allowing customization of different sizes and performance characteristics to meet increasingly diverse market needs.
Intelligent Production and Digital Management: With the development of smart manufacturing and digital technologies, the production efficiency and quality of Square Hollow Section will further improve. Digital production and intelligent equipment will enhance precision, reduce costs, and drive industry advancement.
