7305.12.10 - Of iron or nonalloy steel

This HTS category, 7305.12.10, covers other tubes and pipes of iron or nonalloy steel that have a circular cross-section and an external diameter exceeding 406.4 mm. These pipes are designed for use in oil or gas pipelines and are specifically those that are longitudinally welded. The "of iron or nonalloy steel" designation is crucial, distinguishing these from similar pipes made of alloy steel.

This classification differentiates itself from its sibling, 7305.12.50.00, by the specific material composition. While both are longitudinally welded line pipe with circular cross-sections exceeding 406.4 mm in external diameter, 7305.12.10 is exclusively for pipes made from iron or nonalloy steel. Conversely, 7305.12.50.00 is designated for pipes of alloy steel, necessitating a different classification due to the presence of alloying elements that alter their properties.

Within this category, further subdivisions are made based on the external diameter. Subcategory 7305.12.10.30 applies to pipes with an external diameter greater than 406.4 mm but not exceeding 609.6 mm. Subcategory 7305.12.10.60 is for pipes with an even larger external diameter, exceeding 609.6 mm. These distinctions are important for tariff purposes, reflecting potential differences in manufacturing, application, and market value.