ADC12 Holds Firm as LME Falls: What Tight Scrap Supply Means for Indian Foundry Input Costs

A counterintuitive development has been playing out in India's secondary aluminium market over recent weeks: London Metal Exchange (LME) aluminium prices have weakened — falling approximately 1.2% over the last week of September, from $3,252/mt to $3,213/mt — but domestic ADC12 alloy ingot prices have not followed. Ex-works Mumbai, ADC12 held at ₹3,08,000–3,10,000/mt, roughly flat week-on-week, even as the LME correction that typically drives secondary alloy pricing downward played out. The explanation lies in the scrap market — and what it reveals has direct implications for how Indian foundries should be thinking about their input cost structure and procurement strategy.

Why LME Matters to Indian Foundry Input Costs

ADC12 — an aluminium-silicon-copper die casting alloy (nominally Al-11Si-1Cu) — is the dominant alloy for high-pressure die casting in India's automotive sector, and one of the most widely used alloys across the casting industry. Its pricing is not directly pegged to LME, but LME aluminium serves as a cost anchor for the scrap and secondary ingot markets: when LME rises, scrap collectors and processors hold material for higher prices; when LME falls, the expectation is that secondary alloy prices will soften in parallel. Indian foundries using ADC12 from secondary ingot producers have therefore come to treat LME movements as a leading indicator of their quarterly input cost trajectory. The recent divergence — LME down, ADC12 flat — breaks that correlation and deserves examination.

The Scrap Supply Constraint

The proximate cause of ADC12's resistance to the LME decline is tight scrap supply, particularly in the wire and extrusion scrap categories that are the primary feedstock for secondary aluminium alloy production in India. Wire scrap and extrusion scrap — the off-cuts, process scrap, and end-of-life material from cables, window profiles, and industrial extrusions — are the cleanest and most consistent grades of aluminium scrap available to Indian secondary producers. When these grades are tight, secondary producers cannot freely lower their alloy prices even when LME softens, because their own feedstock costs have not fallen proportionately. The tightness in clean scrap grades reflects several factors: growing domestic consumption of primary aluminium in cable and construction applications (reducing the post-consumer scrap flow relative to overall consumption), selective export of higher-grade Indian scrap to Southeast Asian markets, and periodic disruption to import flows from Europe and the Middle East.

The Import Dimension

India imports significant volumes of aluminium scrap — primarily from the United States, Europe, and the Middle East — to supplement domestic scrap generation. Import pricing for aluminium scrap is directly influenced by freight rates, currency movements (a weaker rupee raises the effective cost of imported scrap even when dollar-denominated prices are stable), and competition from other scrap-importing countries in Asia. In periods when the Indian rupee weakens against the dollar, imported scrap costs rise in rupee terms even if LME is flat or declining — a dynamic that can sustain domestic ADC12 prices above what the LME trend alone would imply. For Indian foundries whose cost models treat LME as a proxy for all input costs, this rupee-import-scrap nexus is a source of systematic forecast error.

What This Means for Foundry Procurement Strategy

The ADC12 price stickiness relative to LME has practical implications for foundry procurement. First, it reinforces the value of quarterly contract pricing with secondary ingot suppliers rather than spot purchasing: locking in prices when scrap is plentiful reduces exposure to the scrap-driven price floors that emerge in tight supply periods. Second, it highlights the importance of tracking scrap market conditions — not just LME — as a forward indicator of alloy cost trends: a tightening in extrusion scrap availability in Gujarat and Maharashtra typically precedes ADC12 price firmness by four to six weeks as secondary producers adjust their buying. Third, for foundries with flexibility to use LM6 or LM24 in applications currently specified in ADC12, a relative pricing analysis in tight scrap periods sometimes reveals an arbitrage — not always, but worth monitoring.

The Near-Term Outlook

Market observers cited in recent trade reporting suggest that the near-term direction of ADC12 prices depends primarily on whether scrap availability improves — specifically whether import flows from the US and Europe recover — and whether post-festival automotive demand (following Navratri and Diwali) sustains the foundry sector's buying appetite into Q4. If scrap tightness persists through November, ADC12 prices are likely to remain firm regardless of LME's direction. If LME sustains its weakness and scrap supply loosens — either through increased imports or softening domestic demand — a price correction in secondary alloy becomes more probable. For foundry procurement teams, the message is to watch scrap market conditions as closely as LME, and to build enough contract cover to avoid being caught on the spot market during periods of supply tightness.