Welded Iron or Steel Line Pipe for Oil or Gas Pipelines (Non-Stainless)

Line pipe headings (730611, 730619) are specifically for pipe used in oil or gas pipeline systems, typically manufactured to API 5L or equivalent specifications. General-purpose welded pipe of similar dimensions would fall under 730630 or 730640. The intended end-use and the applicable manufacturing specification — documented on the mill test report and commercial invoice — are the primary classification determinants.

The split follows Chapter 72 definitions: non-alloy steel lines (7306191000 series) cover iron and carbon steel pipe, while the alloy-steel lines (7306195000 series) cover pipe made from steel with alloying elements meeting the Chapter 72 threshold concentrations. The mill test report's chemical composition data is the authoritative document for making this determination at the time of entry.