Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 ARTICLES OF IRON OR STEEL 73 04 TUBES, PIPES AND HOLLOW PROFILES, SEAMLESS, OF IRON (OTHER THAN CAST IRON) 73 04 19 OTHER LINE PIPE USED FOR OIL/GAS PIPELINES Commodity Code Description 73 04 19 00 OTHER LINE PIPE USED FOR OIL/GAS PIPELINES