WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
73.03 - Tubes, pipes and hollow profiles, of cast iron. This heading a lies to tubes, pipes and hollow profiles manufactured of cast iron as defined in Note 1 to thls tfapter. They may be manufactured by casting in moulds or by centrifugal casting; in the latter case, the molten iron is poured into a horizontal cylinder whch is rapldly rotated so that the metal is forced centrifugally against the walls where it solidifies. These tubes, pipes and hollow profiles may be straight or curved, plain, finned or gilled. They may be socketed, flanged integrally or flanged by welding or threading. To facilitate assembly, socketed i es have one end expanded to receive the end of a second plpe. Flanged pi es can be assemble# means of collars, nuts, bolts, clamps, etc., while threaded or plam en pipes are assembled by means of couplings, rings or collars. 'f' gy This heading also covers tubes, pipes and hollow profiles with multiple or branch openings, and those which are covered, for example, with zinc, plastics, bitumen. Tubes and pipes of this heading are main1 used for pressure or gravity pi elines for water, sewer evacuation, for low pressure gas distri ution, as gutter or dram-pipes or or drainage. r, f! The heading does not cover : (a) Tube ox pipe fittings (heading 73.07). (b) Tubes, pipes and hollow profiles made into identifiable parts of articles, classified in their respective headings, such as sealons of c e n z heating radiators ('heading 73.22) and machinery parts (Section XVI). -
1.- In this Chapter the expression “cast iron” applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1 (d) to Chapter 72. 2.- In this Chapter the word “wire” means hot or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm.