Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 06 Other tubes, pipes and hollow profiles(eg.open seam...),of iron or steel, welded, nes 73 06 50 Other, welded of circular cross-section, of other alloy steel 73 06 50 00 Other, welded of circular cross-section, of other alloy steel Commodity Code Description 73 06 50 00 000 Other, welded of circular cross-section, of other alloy steel