Aluminium Extrusion Billet (6063 & 6061 Homogenised)

Homogenised 6063 and 6061 log and cut billet, 5–10 inch diameter, by Mg, Si, Fe and ultrasonic class

Extrusion billet is bought on three things the extruder cannot fix once the log is in the press: chemistry, homogenisation and soundness. 6063 is the architectural alloy — windows, doors, curtain wall, heat sinks, solar frames — with Mg 0.45–0.90% and Si 0.20–0.60%, Fe ≤ 0.35%, and Cu, Mn, Zn, Cr and Ti each ≤ 0.10%; in practice extruders tighten it to a balanced Mg₂Si band of about 0.45–0.55% Mg and 0.40–0.50% Si for press speed and T5/T6 strength, and to Fe ≤ 0.15–0.20% where the profile will be bright-anodised. 6061 is the structural alloy, with Mg 0.8–1.2%, Si 0.40–0.80%, Cu 0.15–0.40% and Cr 0.04–0.35%, extruded slower and heat-treated for transport, machinery and scaffolding. Homogenisation — a soak at about 560–590 °C followed by controlled cooling — dissolves the coarse Mg₂Si from casting and converts needle-shaped beta iron phases to rounded alpha, and unhomogenised billet shows up as tearing, pick-up and streaks on the profile at speed. Soundness is the direct-chill cast house's job: hydrogen degassing, Al-Ti-B grain refining, ceramic foam filtration and 100% ultrasonic testing for porosity and inclusions to the buyer's class. Diameter is set by the press container, from 5 inch (127 mm) on small presses to 10 inch (254 mm) on large ones, and billet comes as 5.8–7 m logs for a hot log shear or cut to 400–1,200 mm. Secondary billet is cast from remelted 6063 extrusion scrap sweetened with primary metal, and iron creeps up with each cycle, which suits mill-finish and powder-coated profiles and not bright anodising. On the customs side, cast billet is normally declared under HS 7601.20 as unwrought aluminium alloy, but some declarants and importing customs place homogenised, cut billet under HS 7604 (bars, rods and profiles), and the duty can differ, so the importer's customs broker should confirm the heading before the contract. On the trade, UN Comtrade 2025 import declarations under HS 7601.20, which include billet, show India taking 321,469 MT from 55 partners, with the UAE (54,495 MT at USD 2,870/MT CIF), Qatar (51,855 MT at USD 2,842) and Bahrain (41,398 MT at USD 2,798) behind Malaysia (111,595 MT at USD 2,769) — the Gulf lines largely primary cast-house billet and foundry alloy [inference].

The buyer is an extruder in the Gulf, India, Southeast Asia, East Africa or Turkiye buying by press size, alloy and finish, usually monthly, and comparing a primary cast house's billet at a higher premium with secondary billet at a lower one on the reject rate each gives at the press. CBIL is a commodity brokerage company and brokers homogenised 6063 and 6061 billet from cast-house, producer and trader parcels in Pakistan, the UAE, India, Malaysia, Thailand, Vietnam, China, Turkiye and South Africa against third-party chemical analysis: a spectrometer certificate per cast, the homogenisation record and the ultrasonic test report, with independent inspection at stuffing where the buyer asks for it. Price is set off the LME aluminium reference plus a billet premium that reflects alloy, diameter, Fe band and origin. Billet is container cargo — logs bundled on timber bearers with steel strapping, 5.8 m logs in a 20-foot box and longer logs in a 40-foot, about 22–25 MT per container — on FOB, CFR and CIF terms, so freight is container freight booked with the line. Send the alloy, diameter and length, your iron ceiling, the finish (mill, powder-coat or anodise), monthly tonnage and discharge port, and the desk matches cast-house chemistry against them.

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Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.