Section & Structural Rolling

Structural sections — I-beams, H-piles, channels, angles, rails, and sheet piles — are the primary structural elements of buildings, bridges, offshore platforms, and civil infrastructure. Unlike bar and rod, sections have complex, asymmetric cross-sections that require sophisticated roll pass design and, for the widest sections, a specialised universal mill configuration. The global structural sections market consumes approximately 200 million tonnes of steel per year.

Section rolling mills process blooms of 150–400 mm square or rectangular section, charged at 1,100–1,250 °C from a walking beam reheating furnace. The bloom is progressively reduced through breakdown rolls, roughing stands, and a finishing universal mill to the target profile. Finished sections exit as 12–24 m lengths on a cooling bed, before straightening, sawing, and bundling for dispatch.

Product range spans from small equal angles (30×30×3 mm) to very wide-flange H-sections (HD400×1202) — the latter requiring blooms of 450 mm width and multiple side-press (universal) passes to form the wide, parallel flanges. Rail rolling is a specialised sub-category producing 49–60 kg/m rails for railway track — the straightness, residual stress, and surface hardness of rails are subject to some of the tightest tolerances in the entire steel product range.