7305.11.10 - Of iron or nonalloy steel

This HTS classification covers large-diameter pipes and tubes made from iron or nonalloy steel. These are specifically designed for use as line pipe in oil and gas pipelines, and are manufactured using a longitudinally submerged arc welding process. The key defining characteristic for inclusion here is the material composition: exclusively iron or nonalloy steel, excluding those made from alloy steel.

This category is distinguished from its sibling, HTS 7305.11.50.00, which pertains to similar large-diameter, longitudinally submerged arc welded pipes but is made from alloy steel. Therefore, the critical differentiator is the specific steel composition.

Within this classification, further distinctions are made based on the external diameter of the pipe. Subcategories exist to differentiate between pipes with an external diameter exceeding 406.4 mm but not exceeding 609.6 mm (7305.11.10.30) and those with an external diameter exceeding 609.6 mm (7305.11.10.60). These diameter thresholds are crucial for accurate classification and likely relate to specific industry standards or regulatory requirements for oil and gas pipeline infrastructure.