China's aluminium smelters pushed daily output to an all-time high of 129,000 tonnes in April 2026, according to Bloomberg and Discovery Alert. Total production for the first four months reached 15.33 million tonnes, up 3.5% year-on-year — a growth rate that significantly outpaces domestic demand expansion. (FACT: Bloomberg, May 19, 2026; Discovery Alert, May 19, 2026)
The surge is happening against the backdrop of China's 45-million-tonne annual capacity ceiling, imposed in 2017 to curb structural oversupply and reduce carbon emissions. Smelters are not technically exceeding the cap — technological upgrades have allowed them to run roughly 3% above rated nameplate capacity, extracting maximum output from existing infrastructure without formally breaching the policy limit. But at the current run rate, China is on track to produce approximately 47 million tonnes annualized, raising questions about whether Beijing will enforce the ceiling or revise it. (FACT: Mining Weekly, May 19, 2026; ChemAnalyst, May 19, 2026)
The problem is that the demand side cannot keep up. China's property sector, which historically consumed roughly 30% of the country's aluminum, continued its long-term slump. April 2026 data showed property investment fell another 9.8% year-on-year. With domestic demand soft, the surplus is flowing into exports: April aluminium exports rose 15.4% year-on-year to 598,000 tonnes, the strongest single-month export figure since December 2024. (FACT: ChemAnalyst, Bloomberg, May 19, 2026)
The export surge matters for global buyers because it partially offsets the Gulf supply gap. But the quality and form factor differ — China exports primarily semi-fabricated products, not the primary metal that Gulf smelters used to ship. And the volume (598kt/month) is still far below the roughly 800,000-900,000 tonnes/month of primary aluminium that flowed from the Gulf before the crisis. (FACT: Discovery Alert, May 19, 2026)
For now, Chinese smelters are running at maximum margins — high LME prices driven by the Gulf crisis, combined with falling alumina costs, have created a profit environment that incentivizes maximum output regardless of domestic demand. But the inventory overhang is building. If Beijing enforces the 45 Mt cap with production cuts, the resulting supply shock would add upward pressure to already-elevated global prices. If it does nothing, Chinese exports could cap the upside for LME aluminium outside the Gulf premium structure. (FACT: VT Markets, May 19, 2026)
China's record output creates a two-track aluminum market. On one track: Gulf-constrained, backwardated, physically tight — where spot metal commands a $71/t premium over forward. On the other track: Chinese oversupply, inventory building, and aggressive exports — where semi-fabricated product is available but not a substitute for the primary metal that Gulf buyers need. Procurement teams should: (1) Not assume Chinese exports will rescue the physical tightness — the form factor and quality differ. (2) Watch for Beijing policy signals on the 45 Mt cap; any enforcement announcement would be immediately bullish for LME. (3) Consider Chinese semi-fabricated supply as a diversification option for non-critical applications, but verify quality specs before committing volume.