Vietnam OCTG Antidumping Review: Commerce Sets a 15.52% Final Rate on SeAH VINA and Keeps a 111.47% Fallback for Tube and Pipe Buyers

On September 17, 2026, the U.S. Department of Commerce’s Enforcement and Compliance unit published the final results of the 2023-2024 administrative review of the antidumping duty order on oil country tubular goods (OCTG) from Vietnam (91 FR 58848, Doc 2026-19091; case A-552-817). Commerce assigned the mandatory respondent, SeAH Steel VINA Corporation, a weighted-average dumping margin of 15.52% for the period September 1, 2023 through August 31, 2024 – up from the 12.84% preliminary margin. The notice also restates something easy to overlook: Vietnamese exporters without a separate rate face the Vietnam-wide rate of 111.47%.

OCTG is not a distant commodity for machine shops. The order covers seamless and welded pipe and tube used in oil and gas wells, and the same seamless tube in comparable sizes is machined into couplings, downhole tool bodies, hydraulic cylinder barrels and rods, bushings and sleeves. A company-specific rate at 15.52%, and a country-wide fallback seven times higher, is a landed-cost and supplier-qualification event for anyone buying or machining imported tube.

What the Final Results Establish

• Period of review: September 1, 2023 through August 31, 2024.
• Preliminary Results published March 16, 2026 (91 FR 12563, Doc 2026-04995) with a 12.84% margin for SeAH VINA; the review was rescinded in part as to Halima and PPA because there were no reviewable suspended entries during the POR.
• Full briefing occurred: case briefs on April 6, 2026 from SeAH VINA and from Axis Pipe and Tube, Borusan Pipe US, Vallourec Star and Welded Tube USA; rebuttal briefs on April 13, 2026. Unlike a facts-available case, this rate was calculated from the record.
• The deadline was extended by 59 days in three increments; the notice is signed September 11, 2026 and applicable September 17, 2026.
• Commerce changed the margin calculation after reviewing the comments and the issues raised on the record, producing the final 15.52% weighted-average dumping margin for SeAH VINA.
• Assessment: CBP will assess antidumping duties on all appropriate in-scope entries; Commerce intends to issue assessment instructions no earlier than 35 days after publication.
• Cash deposits on shipments entered on or after publication: SeAH VINA 15.52%; previously reviewed exporters keep their most recent separate rate; Vietnamese exporters without a separate rate are at the Vietnam-wide 111.47%; non-Vietnamese exporters with no rate of their own take the rate of the Vietnamese exporter that supplied the goods.

The 111.47% Fallback Is the Real Risk

The headline margin is 15.52%, but the number that changes decisions is 111.47%. Under Commerce’s automatic-assessment practice, POR entries produced by SeAH VINA that the company did not know were destined for the United States liquidate at the Vietnam-wide rate if no rate exists for the intermediate companies in the transaction. That is the structural exposure of unregistered resale: a purchase routed through an intermediary without its own separate rate can be assessed at the country-wide rate rather than at the producer’s rate. A result that moved up rather than down also deserves a second look – this margin was not built on facts available; SeAH VINA participated, both sides briefed, and Commerce revised the calculation after reviewing the issues raised.

What This Changes for Material, Process and Cost

Nothing in the notice alters the mechanical properties of any grade, nor the machinability of any part. What changes is landed cost and documentation on the imported-tube portion of a programme:

• Company-level deposits. A 15.52% cash-deposit requirement on SeAH VINA-origin tube changes working capital and unit cost; the 111.47% fallback changes whether a supply route is viable at all.
• Intermediate trading layers. Every additional intermediary without its own rate raises the same liquidation risk, so direct mill relationships or distributors with published separate rates reduce it.
• Origin documentation is now a machining input. Machining fittings, connectors, cylinder barrels or tool bodies from imported tube does not reset the origin of the tube. The origin of the tube governs which order applies, and the shipper history governs which rate is collected.
• Grade and specification choices carry compliance weight. OCTG and line pipe specifications (API 5CT, API 5L) sit inside the same AD/CVD framework even though the product forms differ; a substitution from one spec to another is an engineering decision that also changes the trade-remedy position.
• Consequences for machining practice are second-order but real. Where a shop re-sources tube, changes in wall thickness, straightness, ovality and condition of supply alter boring and turning practice, tool life and the setups needed to hold bore concentricity. Buyers re-sourcing tube should also revisit lead time and delivery assumptions, because mill qualification and inspection add weeks before the first chip is cut.

A Short Verification Checklist

• Confirm who the producer and the exporter actually are. Ask for the mill certificate and the export documentation for every tube line item, and record whether the exporter holds a separate rate.
• Map intermediary layers. Each reseller between the mill and your door is able to affect which rate applies at liquidation – so map them before the order is placed, not after.
• Model the fallback case too. Price imported tube at both the company-specific rate and, if the chain is unclear, at the country-wide rate, so the contingency is visible in the quote.
• File the reimbursement certificate. Importers must file under 19 CFR 351.402(f)(2) before liquidation; failure can trigger a presumption of reimbursement and double assessment.
• Read the sister cases together. On September 15, 2026, Commerce published final countervailing duty results for OCTG from Korea (91 FR 58421, C-580-913), at a 0.12% de minimis rate for SeAH Steel with entries liquidated without regard to countervailing duties, and preliminary results for OCTG from Turkiye (91 FR 58422, C-489-817) at 0.63% for Borusan against a 9.21% all-others rate. Taken with the parallel antidumping and subsidy investigations into linear hydraulic cylinders, the direction is a steadily denser trade-remedy layer over pressure-containing tube assemblies.

Limited Conclusions

What is established and dated: on September 17, 2026, Commerce published the final results of the 2023-2024 review of the antidumping duty order on OCTG from Vietnam (91 FR 58848, A-552-817), assigning SeAH Steel VINA Corporation a 15.52% weighted-average dumping margin, up from 12.84% preliminary, while the Vietnam-wide rate of 111.47% continues to govern exporters without a separate rate.

The durable takeaway is documentary rather than dramatic. For machined pipe and tube components, the applicable duty follows the producer and exporter of record and the country of origin of the tube – not the shop where it is machined. Keeping the mill certificate, the exporter’s separate-rate status and the applicable cash-deposit rate on the same page as the part drawing is what keeps landed cost and compliance decisions aligned, whichever origin a buyer selects.

References

• Commerce, Enforcement & Compliance. “Oil Country Tubular Goods From the Socialist Republic of Vietnam: Final Results of Antidumping Duty Administrative Review; 2023-2024.” Doc 2026-19091, 91 FR 58848, September 17, 2026 (applicable September 17, 2026; signed September 11, 2026). Retrieved September 18, 2026. federalregister.gov/documents/2026/09/17/2026-19091
• Same notice, official full text (91 FR 58848): full text
• Commerce, Enforcement & Compliance. “Oil Country Tubular Goods From Socialist Republic of Vietnam: Preliminary Results and Rescission, in Part, of Antidumping Duty Administrative Review; 2023-2024.” Doc 2026-04995, 91 FR 12563, March 16, 2026 (12.84% preliminary margin). federalregister.gov/documents/2026/03/16/2026-04995
• Commerce, Enforcement & Compliance. “Oil Country Tubular Goods From the Republic of Korea: Final Results of Countervailing Duty Administrative Review and Rescission, in Part; 2023.” Doc 2026-18788, 91 FR 58421, September 15, 2026 (C-580-913; SeAH Steel 0.12% de minimis; all-others 1.33%). federalregister.gov/documents/2026/09/15/2026-18788
• Commerce, Enforcement & Compliance. “Certain Oil Country Tubular Goods From the Republic of Turkiye: Preliminary Results of Countervailing Duty Administrative Review; 2024.” Doc 2026-18789, 91 FR 58422, September 15, 2026 (C-489-817; Borusan 0.63%; all-others 9.21%). federalregister.gov/documents/2026/09/15/2026-18789
• U.S. Department of Commerce. “Certain Oil Country Tubular Goods From India, the Republic of Korea, Taiwan, the Republic of Turkey, and the Socialist Republic of Vietnam: Antidumping Duty Orders…” 79 FR 53691, September 10, 2014 (underlying order; Vietnam-wide rate basis at 53694). govinfo.gov/FR-2014-09-10
• 19 CFR 351.106(c), “De minimis net countervailable subsidies and weighted-average dumping margins disregarded”; 19 CFR 351.402(f)(2), reimbursement certificate. Retrieved September 18, 2026: 19 CFR 351.106, 19 CFR 351.402

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