Large-Diameter Non-Longitudinally Welded Pipes & Tubes, Iron or Steel (Over 16 In.)

Because China is among the top suppliers under this heading, imports of Chinese-origin large-diameter welded pipe may be subject to both Section 232 steel tariffs and Section 301 tariffs simultaneously. Additionally, antidumping and countervailing duty orders on certain welded pipe from specific countries may apply, so a thorough admissibility and duty-order check by origin is essential before entry.

Mill test reports and manufacturing process certifications typically identify the weld seam orientation. For spiral or helical-welded pipe, the seam angle relative to the pipe axis is the defining characteristic. Importers should obtain and retain these technical documents from the foreign manufacturer to support classification under 730539 versus 730531.