Classification within 7304 follows the article's design and intended use at the time of importation. Line pipe (730411/730419) is designed for conveying fluids in pipelines; casing and tubing (730424/730429) are designed for oil and gas well completion; general-purpose circular tubes (730431–730459) are not dedicated to those oil-field uses. Documentation such as API specifications can support the claimed classification.

Seamless OCTG lines are among the most heavily trade-remedied steel products: Section 232 tariffs apply broadly, and antidumping and countervailing duty orders have been imposed on OCTG from multiple countries. Importers should check the current scope of each order against the specific product specification and country of origin before entry.