7305.39 - Other:

This category, HTS 7305.39, encompasses tubes and pipes of iron or steel that have a circular cross-section, an external diameter exceeding 406.4 mm, and are constructed using methods other than longitudinal welding. These are typically formed through processes such as spiral welding, submerged arc welding, or other similar closure techniques that do not involve a straight weld seam running the length of the pipe. The key defining characteristic is the absence of a longitudinally welded seam.

Distinguishing this category from its sibling, 7305.31, is crucial for accurate classification. HTS 7305.31 specifically covers tubes and pipes where the welding seam runs parallel to the longitudinal axis of the pipe. Therefore, if a pipe of the specified diameter is welded using a spiral or circumferential method, it falls under 7305.39, whereas a pipe with a single, straight weld seam along its length would be classified under 7305.31.

The subcategories within 7305.39 further refine the classification based on the material composition of the iron or steel. HTS 7305.39.10.00 applies to tubes and pipes made from iron or nonalloy steel, which are characterized by their lower carbon content and minimal alloying elements. In contrast, HTS 7305.39.50.00 is for tubes and pipes manufactured from alloy steel, which contains deliberately added elements like chromium, nickel, or molybdenum to enhance properties such as strength, corrosion resistance, or heat tolerance.