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 40 Tubes and pipes, welded, circular, of stainless steel, nes 73 06 40 00 Tubes and pipes, welded, circular, of stainless steel, nes Commodity Code Description 73 06 40 00 00 Tubes and pipes, welded, circular, of stainless steel, nes