Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 06 Other tubes, pipes and hollow profiles of iron or steel, welded, nes 73 06 50 Tubes and pipes, welded, circular, of other alloy steel, nes Commodity Code Description 73 06 50 00 Tubes and pipes, welded, circular, of other alloy steel, nes 73 06 50 11 With an external diameter less than 12.5 mm 73 06 50 19 Other 73 06 50 91 With an external diameter less than 12.5 mm 73 06 50 99 Other
