On 2026-06-19, the aluminium industries of the United States, Europe, Canada and Japan issued a joint G7+ statement demanding coordinated action to address capacity distortions in non-market economies, framing the dispute as damage to both upstream smelting and downstream processing bases [S1].
The 27th China Chlor-Alkali Forum, held in Suzhou from April 25-26, drew over 320 delegates from chlor-alkali producers and upstream/downstream industries for 21 keynote sessions, with CCAIA President Zhang Wenlei mapping the 2024 work programme around high-quality industry development [S2].
Definition and Scope of the Aluminium Value Chain
The aluminium chain splits into upstream (bauxite mining, alumina refining, carbon anode and [electrolytic smelting](http://european-aluminium.eu/)), midstream (primary foundry alloys, billet, slab, extrusion ingot) and downstream (extrusions, sheet, foil, aluminium window and door systems, aluminium veneer panel skins, automotive body sheet, and die-castings). [S1]
The chlor-alkali segment is the cross-over node: every tonne of primary aluminium needs roughly 0.4-0.5 t of caustic soda (NaOH) for Bayer alumina refining, and the same membrane chlor-alkali cell that produces NaOH co-produces chlorine used in PVC and in fluorinated aluminium finishing chemicals. China's forum attendance (320+ delegates, 21 keynotes) was structured exactly to align this coupling [S2].
Selection Criteria: Where the Distortion Bites
The G7+ statement is built on three observable selection criteria for trade defence: government-subsidised power tariffs for Chinese smelters, state-backed financing of captive bauxite overseas, and the export of semi-fabricated value-added product (extrusions, sheet, foil) at prices that European rerollers cannot match [S1].
Aluminium extrusions and aluminium ladders are the canonical downstream items where the G7+ signatories report margin compression.
Who the G7+ Action Is For — and Who It Is Not
The 2026 G7+ statement is addressed at policy makers, not end-buyers: it targets EU CBAM scope expansion, US Section 232 derivative-product coverage, and joint anti-dumping petitions for extrusions and aluminium-ladder SKUs [S1]. Specifiers procuring aluminium alloys in 6063/6061/6082 grades for architectural or transport use sit downstream of this lobbying; their RFQ pricing in Q3-Q4 2026 will be shaped by whether EU ratchet duties land.
The action is NOT for chlor-alkali buyers: caustic soda supply chains remain globally liquid, and chlorine derivative demand is domestic-cycle driven. The 2024 China forum covered exactly that distinction: 21 keynotes spanned alumina, caustic, fluorocarbons and PVC, but not extrusions or rolling-mill product [S2].
Criteria-Based Comparison: G7+ Defence vs. China Domestic Stack
Comparing the two models on four decision criteria: (1) power cost per tonne of primary aluminium — China inland coal at sub-3.5 ¢/kWh vs. European grid at 6-10 ¢/kWh; (2) bauxite security — Chinese JV ownership of West African and Indonesian mines vs. European reliance on third-party offtake; (3) downstream margin — G7+ rerollers at 4-8% EBITDA on can-stock and aerospace plate vs. Chinese extruders at 2-5% on architecture profile; (4) trade-defence coverage — CBAM Phase 2 reporting active, Section 232 derivative list pending expansion [S1][S3].
The SUT study frames the same asymmetry in volume terms: the US runs a structural net-import position in primary and extrusions, while China runs a structural net-export position in those same two segments, exporting the surplus embedded in finished goods such as ladders, scaffolding, and curtain-wall mullions [S3]. For background on how this plays through a different base-metal chain, see the Nickel Supply Chain 2026: Capacity, Price Bands and Sourcing Gates coverage.
Real Use Cases: Extrusion, Ladder and Die-Cast Buyers
An EU window-and-door fabricator sourcing 6063 T5 billet in Q3 2026 should expect two concurrent price signals: the LME three-month aluminium forward, and a Section 232 or EU ratchet duty pass-through on Chinese-origin profile. CBAM Phase 2 reporting is the verification mechanism; reported embedded emissions above the EU default will trigger top-up levies. [S2]
Buyers of die-casting equipment for automotive structural nodes and of gas aluminium melting furnaces for secondary smelters face the mirror image: secondary aluminium — produced from recycled UBC and machining swarf — sits outside the primary distortion debate, and 2024 China forum speakers flagged secondary-feed growth as the structural hedge for the chlor-alkali-coupled primary chain [S2].
Limitations, Constraints and Failure Modes
Coordinated G7+ trade defence has documented failure modes: WTO-consistency challenges on ratchet duties, and the long lead time (typically 18-30 months) from joint statement to provisional duty. The SUT trade-friction study also notes that US-China bilateral tariff cycles in 2018-2020 reshuffled trade flows into Vietnam and Mexico rather than eliminating the Chinese surplus [S3].
On the upstream side, chlor-alkali producers face a hard thermodynamic constraint: membrane cells cannot run below ~2.0 V without chlorine quality falling, so the caustic supply that feeds Bayer refineries cannot be throttled to balance aluminium cycles. The 320+ delegates in Suzhou were briefed on this binding constraint as a planning input [S2].
Sourcing Signals to Track Through Q4 2026
Track the EU Commission ratchet-duty decision on Chinese extrusions (expected Q3 2026 publication in the Official Journal) and the US Section 232 derivative-product list expansion (comment period closed in 2025, final scope pending). The 2024 China forum flagged a high-quality development work programme covering caustic-alumina coupling, secondary aluminium growth, and fluorinated-finishing chemical substitution; the 2026 G7+ statement is the symmetric Western signal [S1][S2].