Section 15 BASE METALS AND ARTICLES OF BASE METAL 73 Articles of iron or steel 73 06 Other tubes, pipes and hollow profiles (for example, open seam or welded, rivete 73 06 11 73 06 11 00 Commodity Code Description 73 06 11 00 00 -- Welded, of stainless steel 73 06 19 00 00 -- Other 73 06 21 00 00 -- Welded, of stainless steel 73 06 29 00 00 -- Other 73 06 30 00 00 - Other, welded, of circular cross-section, of iron or non-alloy steel 73 06 40 00 00 - Other, welded, of circular cross-section, of stainless steel 73 06 50 00 00 - Other, welded, of circular cross-section, of other alloy steel 73 06 61 00 00 -- Of square or rectangular cross-section 73 06 69 00 00 -- Of other non-circular cross-section 73 06 90 00 00 - Other