Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 05 406.4 MM, OF IRON OR STEEL. 73 05 11 LINE PIPE USED FOR OIL/GAS PIPELINES, LONGITUDINALLY SUBMERGED ARC WELDED Commodity Code Description 73 05 11 00 LINE PIPE USED FOR OIL/GAS PIPELINES, LONGITUDINALLY SUBMERGED ARC WELDED