Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 Articles of iron or steel 73 05 Other tubes and pipes (for example, welded, riveted or similarly closed), having 73 05 11 73 05 11 00 Commodity Code Description 73 05 11 00 00 -- Longitudinally submerged arc welded 73 05 12 00 00 -- Other, longitudinally welded 73 05 19 00 00 -- Other 73 05 20 00 00 - Casing of a kind used in drilling for oil or gas 73 05 31 00 00 -- Longitudinally welded 73 05 39 00 00 -- Other 73 05 90 00 00 - Other