Scope. Mills with explicit 6063 alloy capability (architectural, windows, system-window, curtain-wall categories) and at least 3 destination markets in our top_markets registry. 6063-T5 and 6063-T6 are essentially universal for window/door extrusion, so the differentiator is which mills actually move volume across borders.
Scoring. A composite 0-100 score:
(1) Export breadth (40%) — distinct destination-market count from top_markets, weighted equally across markets. A mill shipping to 8 markets scores higher than one shipping to 3.
(2) Capacity (30%) — extrusion tonnage. Capped at 800,000 t/yr to avoid integrated smelter-plus-extruder mills dominating.
(3) Architectural focus (20%) — explicit category match.
(4) Listing transparency (10%).
Tie-breakers: capacity, founding date.
Why this ranking exists. Many B2B buyer-search queries are alloy-specific ('6063 extruder China'). This list filters for mills with proven cross-border 6063 supply, so the buyer can skip the step of confirming export experience.
Disclaimer. top_markets is derived from mill self-reporting + ImportYeti customs records + listed-company segment disclosure. It reflects activity in 2023-2025; market mix shifts annually.
Fontes citadas. ImportYeti customs records · China SAMR registry · Mill annual reports · Top-markets registry
Aviso: não é vaga paga. Nenhuma usina pagou para entrar ou melhorar a posição. Revisada quarterly.