Aluminium Billet
A cylindrical cast form of aluminium used as feedstock for extrusion into profiles for construction, automotive and industrial applications.
Covered in 2 MetalsCost.com News Intelligence articles, most recently on September 17, 2026.
Overview
Aluminium billet is the cast, cylindrical starting stock for extrusion — the intermediate step between raw metal and finished profile shapes. It's produced by direct-chill casting, where molten aluminium is continuously solidified into long cylindrical logs, then homogenized (reheated and held) to even out its internal structure before it's cut to length and sold on to extruders. Most billet destined for construction and general engineering is a 6000-series alloy, chosen because it extrudes easily and can be heat-treated afterward for strength.
From Billet to Profile
A billet has no shape of its own beyond a cylinder — its value is entirely in what it becomes. Extruders reheat it to roughly 400-500°C, soft enough to flow but still solid, and force it through a steel die under enormous ram pressure, producing a continuous profile that takes the die's cross-section: window frames, door tracks, heat sinks, structural sections and automotive components. The extruded profile is then quenched, stretched to straighten it, cut to length and often artificially aged to reach final temper.
Coverage
India Pushes Its Mining and Metals Industry to Compete on Technology, Not Just Raw Ore
India's government urged miners and metal producers to build separation, refining and magnet technology instead of just extracting more ore, backing the push with a ₹1 lakh crore R&D fund.
Aluminium Stockpiles Hit a Multi-Decade Low as Gulf War Disruption Squeezes Supply
LME aluminium stocks have halved in 2026 to 246,925 tonnes, the lowest in the exchange's 18-year public record, as Gulf war damage to smelters and a Mozambique plant closure squeeze supply.
