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Korea's anti-dumping process is bifurcated, as in other recent KTC cases (see 2026-04-16-korea-ktc-provisional-ad-chinese-zinc-coated-cold-rolled-steel): the Korea Trade Commission (KTC), under the Ministry of Trade, Industry and Energy, investigates dumping margins and injury and issues a determination; the Ministry of Economy and Finance (MOEF) then operationalises the duty by official gazette notice.
Timeline:
Neungwon Metal Industry and LS Metal, Korea's two domestic seamless copper tube producers.
dumping confirmed, threat of material injury found; KTC recommends a provisional duty of 3.64% to MOEF.
provisional duty for a four-month window (30 Mar–29 Jul 2026): 3.64% (Hong Kong Hailiang Metal Trading and affiliates), 8.41% (Fine Metal Technologies Public Company Limited and affiliates), 3.64% (all other Thai suppliers).
final determination, confirming material injury and recommending MOEF impose final duties of 4.93% (Hailiang and affiliates, raised from the 3.64% provisional rate), 8.41% (Fine Metal, unchanged), and 4.93% (all others) for an initial 5-year term. As of this filing, MOEF had not yet gazetted the final rates; the 3.64–8.41% provisional schedule remains the only legally operative rate. See Open questions.
Product scope — seamless copper tubes and pipes made from refined copper, outer diameter ≤66.68mm, wall thickness 0.20–2.50mm (HSK 7411.10.0000), used in air conditioners, refrigerators, industrial heat exchangers, and HVAC/air-conditioning systems.
The investigation opened 12 September 2025, roughly six weeks after the US Section 232 50% copper tariff (Proclamation 10962, effective 1 August 2025 — see 2025-07-30-us-section-232-copper-tariff-proclamation-10962) priced semi-finished copper products out of the US market. Korean trade press covering this case explicitly frames it in terms of "우회 수출" (circumvention/trans-shipment exports) through Southeast Asian production facilities, the same displacement narrative already documented in the KTC's April 2026 zinc-coated-steel case following the Section 232 steel tariff. This is a plausible contributing factor rather than a confirmed causal chain — no KTC or MOEF document explicitly cites the US tariff as the investigation's trigger — but the timing and the domestic-industry framing are consistent with the same redirected-supply mechanism.
price-floor relief on Thai seamless copper tube imports for the duration of the provisional (and, pending gazette, final) duties.
Metal Technologies face a material cost disadvantage in the Korean market; Fine Metal's 8.41% rate (more than double Hailiang's) will weigh most heavily on its Korean market share.
OEMs and HVAC/industrial heat-exchanger fabricators face modest input-cost pressure on this narrow product line; the rates (3.64– 8.41%, soon 4.93–8.41%) are low relative to Korea's concurrent steel AD cases (22–34%), so the pass-through effect should be limited.
against Thai/Southeast Asian imports in 2025-26 (following the zinc-coated-steel case against China), reinforcing a pattern of Korean trade-remedy activity absorbing supply redirected from US Section 232 tariff escalations.
determination (4.93% Hailiang / 8.41% Fine Metal / 4.93% others, 5-year term) — the provisional 3.64–8.41% schedule expires 29 July 2026, so a gazette action is needed imminently to avoid a duty-free gap. File as an amendment once the MOEF notice number and date are confirmed.
lieu of the final duty, as sometimes occurs in Korean AD final phases.
reflects an actual transshipment-origin inquiry (e.g., Chinese copper routed through Thai processing) rather than genuine Thai-origin production — this would mirror circumvention questions already open in the parallel zinc-coated-steel case.