Structural Hollow Section Steel

Structural hollow section steel refers to cold-formed or hot-finished steel tubes with square, rectangular, or circular cross-sections, manufactured specifically for structural applications. These sections provide superior strength-to-weight ratios compared to solid sections, offering excellent torsional resistance and efficient material distribution. In B2B supply chains, they serve as essential raw materials for fabricators producing frameworks, trusses, columns, and space frames across commercial, industrial, and infrastructure projects. Their hollow nature allows for utility routing while maintaining structural integrity.

Typical materials include carbon steel and high-strength low-alloy steel. Key parameters, as listed in the directory, include yield strength (235–355 MPa), tensile strength (360–510 MPa), wall thickness (2.0–12.5 mm), section modulus (3.5–1200 cm³), surface treatment (HDG 70–85), length tolerance (±0.5 mm), outer dimension (20–400 mm), corner radius (1.5–6.0 mm), mass per meter (1.2–150 kg/m), torsional constant (0.5–1500 cm⁴), straightness tolerance (0.2–0.3%), and twist tolerance (2–4 mm/m). These values are reference ranges and must be verified for the specific product model and application.

Relevant standards include EN 10025 for material properties, EN 10210 for hot-finished sections, EN 10219 for cold-formed sections, and ISO 1461 for hot-dip galvanized coating. These standards serve as procurement and verification references; they do not imply certification or compliance of any specific product or supplier. Buyers should confirm exact specifications and standards compliance with the legal manufacturer or supplier before use.

The hollow cross-section distributes material efficiently around the perimeter, maximizing moment of inertia and section modulus while minimizing weight. This provides optimal resistance to bending, compression, and torsional loads. The closed shape enhances torsional rigidity compared to open sections, and the efficient material placement reduces material usage without compromising strength. In structural applications, the section transfers loads along its length, with the walls resisting axial and shear forces. The hollow interior also allows for routing of utilities, but this must be accounted for in design to avoid compromising structural integrity. The working principle relies on the geometric properties of the cross-section, which are defined by parameters such as outer dimensions, wall thickness, and corner radius.