7304.19.50 - Of other alloy steel

This HTS category, 7304.19.50, classifies seamless tubes, pipes, and hollow profiles of iron or steel that are specifically of "other alloy steel" and are intended for use as line pipe in oil or gas pipelines. The key distinguishing factor for this subcategory is the material composition; it specifically excludes pipes made from iron or non-alloy steel, which fall under sibling category 7304.19.10. Therefore, goods classified here must contain alloying elements beyond the basic iron and carbon that define non-alloy steel, contributing to enhanced properties like strength, corrosion resistance, or temperature tolerance suitable for demanding pipeline applications.

The subcategories within 7304.19.50 further refine the classification based on the physical dimensions of the pipe. The distinction is made by the outside diameter, with specific breakpoints at 114.3 mm and 406.4 mm. This granular segmentation allows for precise tariff application based on the size of the pipe, reflecting variations in manufacturing processes, material usage, and typical applications within the oil and gas industry, from smaller distribution lines to larger transmission mains.