Indonesia’s anti-dumping committee opens an investigation into Chinese galvanised steel that supplied four fifths of a 2.56 million tonne import wave, joining Japan, Australia, Malaysia and Taiwan in a coated-steel enforcement cascade now running across Asia.
JAKARTA, September 20, 2026
Indonesia has opened an anti-dumping investigation into imports of galvanised and zinc-coated steel sheet from China, targeting a product category in which Chinese mills supplied roughly 81 percent of Indonesian imports over the past three years.
The Indonesian Anti-Dumping Committee, known by its Indonesian acronym KADI, announced the initiation on September 15, 2026, with the case entering the international trade press over the following days. The investigation follows an application from two domestic producers, PT Tata Metal Lestari and PT ArcelorMittal Nippon Steel Indonesia, and covers goods classified under nine tariff subheadings spanning flat-rolled products plated or coated with zinc.
According to KADI, its preliminary assessment identified sufficient evidence that increased Chinese imports had injured domestic producers. Over the three years from 2023 to 2025, Indonesia imported 2.56 million metric tons of the products concerned, of which 2.08 million tons came from China.
The committee has notified relevant producers, exporters, importers and government representatives. The investigation is scheduled to run for up to 12 months, with a possible extension to 18 months.
The product and the numbers
Galvanised steel sheet is among the most widely traded finished flat products in Asia. It is cold-rolled coil that has been coated with zinc, by hot-dip immersion or by electrolytic deposition, to resist corrosion. It goes into roofing and cladding, into light structural framing, into ducting, into appliance housings and into automotive body panels. In a tropical, high-humidity, construction-intensive economy such as Indonesia’s, it is a staple rather than a specialty.
The products under investigation fall under Indonesian tariff codes 7210.49.11, 7210.49.17, 7210.49.18, 7210.49.19, 7212.30.12, 7212.30.13, 7212.30.19, 7225.92.90 and 7225.99.90. The spread across chapters 7210, 7212 and 7225 is deliberate and instructive. It captures wide coil, narrow strip and alloy-grade material in a single case, which closes the most obvious reclassification routes available to exporters once a measure is imposed.
The volume figures are the heart of the complaint. An average of roughly 853,000 tons of imports a year across the period, with about 693,000 tons a year originating in China, is a substantial share of a domestic market that Indonesian producers have spent the past decade building capacity to serve. Indonesia’s coated steel sector has attracted significant investment, including from the ArcelorMittal Nippon Steel joint venture and from domestic groups expanding downstream from cold rolling into coating lines, and the return on that investment depends on capturing domestic demand that is currently being met from abroad.
Why now
Indonesia’s decision cannot be read in isolation. It is the latest in a sequence of coated-steel actions across the Asia Pacific that have accumulated over roughly six weeks.
Japan moved first and hardest. Provisional anti-dumping duties ranging from 29.2 percent to 55.3 percent were applied to hot-dipped galvanised steel strip and sheet from South Korea and China, running from August 8 to December 7, 2026, after a preliminary determination that the products had been imported at dumped prices and had caused material injury to Japanese producers. The underlying investigation had been launched in August 2025 following a complaint from four manufacturers.
Australia initiated a probe into galvanised steel from three countries on September 10, 2026. Malaysia launched an anti-dumping investigation into stainless steel imports from Indonesia on September 11. Taiwan opened an anti-dumping investigation into stainless cold-rolled coil from Vietnam in August. Taiwan had earlier imposed provisional anti-dumping duties on electrical steel from South Korea and China.
Each of these cases has its own domestic complainants and its own evidentiary record. Taken together they describe a single phenomenon. Chinese steel exports have been running at levels not seen since the middle of the last decade, and every major importing jurisdiction in Asia is now processing the consequences through its trade remedy system at roughly the same time.
The Organisation for Economic Co-operation and Development has been tracking the pattern, noting that anti-dumping measures on steel remained a common tool in 2025 and that an increasing number of jurisdictions are turning to large-scale use of them. The organisation has separately warned that global steel demand recovery is likely to remain weak while the excess capacity crisis deepens, which is the structural condition underneath every one of these cases.
The cascade mechanism
The sequence matters more than any individual case, because trade remedies in a regional market behave like a cascade.
When Japan applies provisional duties of up to 55.3 percent on galvanised steel from China and South Korea, the tonnes that were previously landing in Japanese ports do not evaporate. They look for the next open market. If Australia then closes, and Taiwan closes, the search narrows further. Southeast Asia, with strong construction demand, growing appliance manufacturing and comparatively light trade defence coverage in some product categories, becomes the destination of last resort.
Indonesian producers have made precisely this argument in previous cases, and it is implicit in the timing of the current one. An importing country that waits while its neighbours act discovers that it has absorbed not only the original import pressure but also the volumes displaced from everywhere else.
The same logic operates at the far end of the chain. Indonesia is itself a respondent in other jurisdictions’ cases. The European Commission initiated an expiry review on September 16, 2026 into anti-dumping duties on cold-rolled stainless steel sheets and coils from India and Indonesia, following a request from the European steel association EUROFER. Existing duties in that case run at 9.3, 19.3 and 20.2 percent for Indonesian material. Malaysia’s stainless steel case, initiated on September 11, names Indonesia as the country of origin under investigation.
Indonesia is therefore simultaneously plaintiff and defendant in the regional coated and stainless steel dispute, a position that is increasingly normal and that complicates any attempt to characterise these cases as a simple confrontation between China and everyone else.
Process and timeline
KADI investigations follow the framework set out in Indonesian regulations implementing the World Trade Organization Anti-Dumping Agreement.
Following initiation, the committee issues questionnaires to known exporters, foreign producers, importers and domestic producers. Responses are typically due within 30 to 37 days, with extensions available on request. KADI may conduct verification visits, holds hearings at which interested parties present arguments, and issues a preliminary determination that can support provisional duties. Provisional measures, where imposed, are usually secured by a cash deposit or bank guarantee rather than collected outright, and are limited in duration.
The nominal 12 month timetable, extendable to 18, places a final determination in the second half of 2027 at the earliest if the schedule runs long, and in late 2027 at the outer limit. A preliminary determination, and with it the first realistic prospect of provisional duties, could come considerably sooner. Exporters and importers planning shipments into Indonesia should treat the first half of 2027 as the window in which costs may change.
Two procedural points deserve emphasis for exporters. First, non-cooperation is expensive. Where an exporter does not respond to the questionnaire or does not permit verification, the investigating authority may use facts available, which in practice means the highest margin supported by the record, generally the one alleged in the complaint. Second, individual margins are available only to exporters who participate. A Chinese mill with a genuinely low dumping margin that declines to engage will nonetheless receive the residual, all-others rate.
The domestic politics
The complainants are not marginal players. PT ArcelorMittal Nippon Steel Indonesia is the local arm of a joint venture between two of the largest steel groups in the world, and PT Tata Metal Lestari is a significant domestic coated products manufacturer. Their combined participation gives the application the industry standing required to proceed and signals that the case has the backing of both the foreign-invested and the domestic segments of Indonesia’s steel sector.
The policy backdrop is supportive. Indonesia has pursued downstream industrialisation with unusual determination across commodities, most visibly in nickel, where export restrictions on ore were used to force processing capacity onshore. The same philosophy applies to steel. A government that has staked industrial policy on capturing value domestically is unlikely to view a persistent 81 percent import share from a single origin with equanimity.
There is a countervailing constituency. Indonesia’s construction sector, its appliance assemblers and its automotive component suppliers all buy coated steel, and all would face higher input costs under duties. Those industries have their own associations and their own access to government. In previous Indonesian trade remedy cases, downstream users have argued that domestic capacity cannot supply the required grades, widths and coating weights, and that measures would create shortages rather than substitution. Expect those arguments to be made again.
What it means for importers and traders
For companies buying Chinese galvanised steel for the Indonesian market, the initiation changes the risk profile immediately even though no duty has yet been imposed.
Contracts should be reviewed for duty allocation. A long-dated supply agreement priced on a delivered basis transfers the entire risk of a provisional duty to the seller, while a free-on-board contract leaves it with the buyer. Neither party usually intends that outcome when the contract is signed during an open investigation, and the ambiguity is best resolved in writing before a preliminary determination lands.
Shipment timing should be reconsidered. Indonesian practice does not routinely apply duties retroactively, but provisional measures can be imposed with limited notice after a preliminary determination. Material contracted now for delivery in the second half of 2027 carries genuine exposure.
Supplier qualification should begin now rather than later. Alternative origins for galvanised sheet include Vietnam, India, South Korea, Taiwan and Japan, though several of those origins carry their own trade remedy histories in other markets and some are subject to Indonesian measures on adjacent products. Domestic Indonesian supply is the obvious alternative and is the outcome the case is designed to produce, but capacity qualification for specific coating weights and surface finishes takes months.
Documentation discipline matters more than usual. Where duties are eventually imposed on a country-specific basis, customs authorities scrutinise declared origin closely. Coil rolled in China and coated in a third country is a classic circumvention pattern, and jurisdictions across the region have become adept at detecting it. Importers who source from intermediaries should be able to evidence the full production history of the material they buy.
What it means for Chinese exporters
For Chinese mills, the Indonesian case is one more closure in a year of closures, and the cumulative effect is what matters.
Chinese steel exports have been the release valve for a domestic market in which construction demand has fallen sharply from its peak. Export volumes have been sustained at extraordinary levels, and every jurisdiction that imposes measures reduces the addressable market for those volumes. Japan, Australia, Taiwan, Indonesia, Malaysia, Mexico, Brazil, South Africa, India, the European Union and the United States have all taken action on one or more coated, flat or stainless steel categories within the past 18 months.
The strategic responses available to Chinese exporters are limited and each has costs. Participation in investigations to secure a low individual margin is effective but requires disclosure of cost and pricing data that many mills are reluctant to provide. Price discipline, meaning raising export prices to eliminate dumping margins, protects market access at the cost of the volume that motivated the exports in the first place. Relocation of capacity to third countries preserves market access until anti-circumvention measures catch up, which they increasingly do. Retreat to the domestic market compounds the overcapacity problem at home.
None of these is a solution at the scale of the underlying imbalance, which is why the OECD frames the issue as a capacity question rather than a trade question.
Regional supply chain implications
Three effects are likely to propagate through Southeast Asian supply chains over the coming year.
Prices for coated steel in Indonesia will firm in anticipation of measures, as they generally do once an investigation becomes public. Domestic producers gain pricing power from the prospect of duties well before any duty is collected, and importers building inventory ahead of a possible provisional determination add demand on top.
Trade flows will reroute before they contract. Historically, the initiation of an anti-dumping case in one Southeast Asian market produces a measurable increase in imports into neighbouring markets within one to two quarters, as exporters redirect committed production. Vietnamese, Thai and Philippine buyers should expect increased offers of Chinese galvanised material at attractive prices, and their domestic producers should expect to be making their own complaints in due course.
Regional integration commitments will come under strain. Indonesia, Malaysia and the other ASEAN members operate within a free trade area that has largely eliminated intra-regional tariffs on industrial goods. Trade remedies are permitted within that framework, and Malaysia’s case against Indonesian stainless steel demonstrates that members will use them against each other. A proliferation of intra-ASEAN cases alongside the cases against China would complicate the bloc’s longstanding narrative of deepening integration.
The economics of the complaint
Behind the legal machinery sits a straightforward commercial calculation, and it is worth setting out because it explains why cases of this kind proliferate.
Galvanised sheet is produced by passing cold-rolled substrate through a continuous coating line. The economics are dominated by two variables: the cost of the substrate and the utilisation rate of the line. Coating lines are capital intensive and have high fixed costs, so unit costs fall sharply with throughput and rise sharply when volume is lost. A producer operating at 90 percent of capacity and a producer operating at 55 percent of the same capacity have materially different cost positions even with identical equipment and identical substrate costs.
That is the mechanism by which import pressure converts into injury. Imports do not need to displace all domestic sales to damage a domestic producer. They need only to take enough volume to push the coating line down the cost curve, at which point the producer faces a choice between holding price and losing more volume, or cutting price and losing margin. Trade remedy investigations are largely an exercise in documenting that sequence with audited numbers.
For Indonesia specifically, the substrate question adds a further dimension. A coating line that buys imported cold-rolled substrate has a different exposure from one integrated back to melting. Where a complaint is brought by producers at different levels of integration, as appears to be the case here, the injury analysis has to accommodate both, and the remedy that results affects them differently. An integrated producer benefits from protection of both the substrate and the coated product. A non-integrated coater benefits from protection of the coated product but is exposed if the substrate it buys is protected too.
This is the same tension that European downstream fabricators have raised in Brussels, and it is likely to surface in Jakarta as the case develops. It is also why the scope of the eventual product definition, and any exclusions attached to it, will matter more to individual companies than the headline duty rate.
The demand side completes the picture. Indonesian construction activity, appliance manufacturing and automotive assembly all consume coated sheet, and all are growing. A market that is expanding can absorb both rising domestic production and continued imports without either side feeling acute pain. A market that flattens cannot. The trajectory of Indonesian construction spending over the next four quarters will therefore shape the injury record as much as any import statistic.
What to watch
The decisive moments in this case will be the questionnaire responses and the preliminary determination.
Whether the major Chinese exporters participate will shape the outcome more than any other single factor. Broad participation tends to produce a spread of individual margins, some of them low enough to preserve trade. Limited participation tends to produce a uniformly high residual rate that effectively closes the market.
The scope of the eventual measure is the second variable. Nine tariff subheadings is a wide net, and downstream users will press for exclusions covering grades, widths and coating specifications that they argue are not made in Indonesia. The breadth of any exclusions will determine how much of the trade actually stops.
The third is the reaction from Beijing. China’s Ministry of Commerce has responded to trade measures from middle powers with a mixture of formal objection, investigation of the complaining country’s own exports and, in some instances, trade and investment barrier inquiries. Indonesia’s export profile to China, dominated by nickel products, coal and palm oil, gives Beijing options it does not have with every complainant. Whether it chooses to use them will say a good deal about how far China is prepared to let the regional enforcement cascade run unanswered.