Court Flip-Flops Korean Pipe Duties: Commerce Updates the Tab
Published Date: 9/30/2026
Notice
Summary
The U.S. Department of Commerce is updating its rules on welded line pipe from South Korea after a court decision changed the final dumping rates. This affects SeAH Steel and other Korean exporters, possibly changing the extra duties they pay when selling in the U.S. These changes take effect starting September 25, 2026, so companies should get ready for new costs and rules.
Analyzed Economic Effects
3 provisions identified: 0 benefits, 0 costs, 3 mixed.
New antidumping margins set
If you are a Korean exporter or a U.S. importer of welded line pipe, Commerce set new estimated weighted-average dumping margins effective September 25, 2026: SeAH Steel Corporation — 4.55%, and All Other producers and exporters — 5.39%. These percentage margins are the rates Commerce will use to calculate antidumping duties on affected imports.
Cash deposit rules updated for "All Others"
Commerce stated that SeAH's current cash deposit rate will not change because SeAH has a superseding cash deposit rate. For All Other producers and exporters, Commerce will issue revised cash deposit instructions to U.S. Customs and Border Protection, effective September 25, 2026, and those revised cash deposit requirements will remain in effect until further notice.
Differential pricing methodology changed
In its March 2026 fourth redetermination (sustained by the Court), Commerce discontinued use of the Cohen's d test and the mixed-method comparison methodology and adopted the "price difference test" to determine whether prices differ significantly. This methodological change was affirmed by the Court and is part of the basis for the amended final determination.
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