Precision Hollow Structural Sections for Construction & Engineering
Produced from premium carbon steel using High-Frequency Electric Resistance Welding (HFW), Alland Steel Hollow Structural Sections (HSS) include both Square (SHS) and Rectangular (RHS) profiles. Engineered for modern structural, architectural, and industrial frameworks, these sections deliver superior strength-to-weight ratio, smooth geometry, and excellent weld integrity — ensuring reliable performance and fabrication efficiency across demanding applications. All products strictly conform to EN 10219, ASTM A500, AS/NZS 1163, and JIS G3466 standards.
Manufactured through high-frequency ERW (HFW) for smooth welds, uniform mechanical properties, and superior torsional resistance.
Available in both Square (SHS) and Rectangular (RHS) configurations — offering flexibility for architectural, structural, and mechanical designs.
Compliant with EN 10219, ASTM A500, AS/NZS 1163, and JIS G3466, ensuring consistent quality and dimensional precision.
Ideal for construction, machinery, bridges, and general engineering projects demanding high strength, aesthetic clarity, and easy fabrication.
HSS (SHS & RHS) — Hollow Structural Sections
Allland Steel supplies Hollow Structural Sections (HSS) in both Square (SHS) and Rectangular (RHS) profiles, manufactured by High-Frequency Electric Resistance Welding (HFW/ERW). Our hollow sections feature a high strength-to-weight ratio, clean geometry, and excellent torsional resistance — ideal for buildings, bridges, machinery frames, and general engineering structures. These hollow sections conform to EN 10219 / EN 10210, ASTM A500, AS/NZS 1163, and JIS G3466 standards.
- High-frequency ERW (HFW) process ensures clean seams and consistent mechanical properties.
- Available as Square (SHS) and Rectangular (RHS) for flexible structural and architectural design.
- Excellent weldability, dimensional precision, and fabrication efficiency for modern engineering needs.
Description
Rectangular Hollow Sections (RHS), also known as rectangular steel tubes, are structural-grade pipes with a rectangular cross-section. They are primarily produced by Electric Resistance Welding (ERW), in which steel strip is formed into a round tube and then reshaped into a rectangle through precision roll forming. These hollow sections may also be hot-formed for thicker sizes to enhance wall uniformity and dimensional stability. RHS offer high strength-to-weight ratios, particularly in bending along the major axis, making them efficient materials for beams and columns that bear unidirectional loads.
As versatile hollow sections, RHS are available in a wide dimensional range and conform to global standards including ASTM A500, EN 10219/EN 10210, JIS G3466, and AS/NZS 1163. The sections feature clean edges, excellent weldability, and superior torsional resistance, ideal for buildings, bridges, machinery frames, and heavy structural applications.
- Produced via ERW (cold or hot formed) process with smooth, uniform welds; seamless RHS available for special cases.
- High strength-to-weight ratio — effective for unidirectional bending loads in columns and beams.
- Available in precise dimensional tolerances and consistent mechanical performance per EN and ASTM standards.
- Surface options include black, oiled, galvanized, painted, or powder-coated finishes for corrosion protection.
| Product | Rectangular Hollow Section (RHS) |
|---|---|
| Manufacturing Process | ERW (Cold / Hot Formed); Seamless (rare for RHS) |
| Standards | ASTM A500 (Gr.A–D) · EN 10219 / EN 10210 · JIS G3466 (STKR400, STKR490) · AS/NZS 1163 (C250–C450) |
| Steel Grades | Q195 · Q235 · Q345 · S235 · S275 · S355 · Gr.A–D · STKR400 · STKR490 |
| Dimensions (A × B) | 20×30 mm – 400×600 mm (or larger upon request) |
| Wall Thickness | 0.8 mm – 25 mm (depending on size and standard) |
| Length | 6 m / 12 m (customizable) |
| Corner Radius | Typically 2T–3T (T = wall thickness) |
| Surface Treatment | Black · Oiled · Galvanized · Painted · Powder Coated |
| Inspection | Dimensional check · Tensile & yield test · Elongation · Weld inspection · Chemical analysis |
Square Hollow Sections (SHS) are structural tubes produced by high-frequency Electric Resistance Welding (ERW) or hot-forming processes. In the ERW route, steel strip is cold-rolled into a round tube, welded, and then shaped into a square by sizing rolls. Heat treatment relieves residual stresses, ensuring high dimensional precision (±0.5 mm). These hollow sections are also manufactured in hot-formed routes by heating round tubes to 900–950 °C and hydraulically expanding them into square shapes, achieving wall uniformity above 95%.
The closed square hollow section provides excellent torsional rigidity and load-bearing performance. High-strength low-alloy (HSLA) grades with yield strengths ≥ 355 MPa offer lighter weight and improved weldability — ideal for architectural frameworks, mechanical trusses, and heavy structural members. SHS conform to ASTM A500, EN 10219/EN 10210, JIS G3466, and AS/NZS 1163.
- Manufactured via ERW (cold or hot formed) process; seamless SHS available for specific engineering needs.
- Excellent torsional and compressive performance due to closed-section geometry.
- High dimensional precision (±0.5 mm) and uniform wall thickness (≥95%) after forming and heat treatment.
- Available in HSLA grades (≥ 355 MPa yield strength) for optimized strength-to-weight ratio.
| Product | Square Hollow Section (SHS) |
|---|---|
| Manufacturing Process | ERW (Cold / Hot Formed); Seamless (rare for SHS) |
| Standards | ASTM A500 (Gr.A–D) · EN 10219 / EN 10210 · JIS G3466 (STKR400, STKR490) · AS/NZS 1163 (C250–C450) |
| Steel Grades | Q195 · Q235 · Q345 · S235 · S275 · S355 · Gr.A–D · STKR400 · STKR490 |
| Dimensions (Side × Side) | 15×15 mm – 500×500 mm (larger sizes available) |
| Wall Thickness | 0.8 mm – 25 mm (depending on standard) |
| Length | 6 m / 12 m (customized, e.g., 5.8 m for container loading) |
| Corner Radius | Typically 2T–3T (T = wall thickness) |
| Surface Treatment | Black · Oiled · Galvanized · Painted · Powder Coated |
| Inspection | Dimensional check · Tensile & yield test · Elongation · Weld test · Chemical analysis |
Specifications Sheet
Square Hollow Section (SHS)
Rectangular Hollow Section (RHS)
Main Applications
HSS (SHS & RHS) provide high torsional rigidity, excellent strength-to-weight ratio, and clean geometry for modern steelwork. With precise dimensions and consistent mechanical properties from ERW/hot-forming, they fit architectural and industrial use cases.
Building Frames & Columns
Primary/secondary members for multi-storey frames, braced cores, perimeter columns; closed sections resist buckling and torsion.
Beams, Trusses & Bridges
Efficient chords/diagonals for roof trusses, pedestrian/pipe bridges and platforms where stiffness and aesthetics matter.
Machinery & Fabrication
Equipment bases, gantries, racks, conveyors and general fabrication requiring straightness, weldability and repeatability.
Architectural & Façade
Canopies, façade mullions, handrails and guardrails; crisp edges and smooth faces deliver clean architectural lines.
Infrastructure & Energy
Solar mounting, sign structures, agricultural frames and utility supports; coatings available for long-term corrosion protection.
Advantages
- Structural Efficiency: High torsional rigidity and strength-to-weight ratio versus open sections.
- Precision & Consistency: Tight tolerances (typ. ±0.5 mm), uniform WT; corner radius usually 2T–3T.
- Fabrication Friendly: Excellent weldability, straightness and fit-up for cutting, drilling and automated welding.
- Versatile Standards: EN 10219/10210, ASTM A500, AS/NZS 1163, JIS G3466 grades available.
- Durability Options: Bare, black varnish, GI, FBE, 3LPE/3LPP to meet environment and service life targets.
Packing & Transportation
Standard export packing: strapped bundles with plastic end caps and anti-rust oil; edge protectors and PE wrap as required. Logistics are selected by size, coating and route to protect straightness and corners.
- Container Shipping: 20'/40' containers for 5.8–6 m or 11.8–12 m lengths; bundles blocked and lashed.
- Bulk / Break-Bulk: Large lots on wooden dunnage with spacers; corner protection and top covers for coated HSS.
- Flat Rack / Frame: For oversized sections; nylon slings for lifting, no hooks on edges, keep bundles compact.
