242033 Other tubes and pipes, of circular cross section, welded, of an external diameter of = 406,4 mm, of steel

24203310 Tubes and pipes, of circular cross-section, welded, of an external diameter <= 406.4 mm, of stainless steel (excluding line pipe of a kind used for oil or gas pipelines, and casing and tubing used for oil or gas drilling) 24203340 Precision tubes and pipes, of circular cross-section, welded, of an external diameter <= 406,4 mm, of steel other than stainless steel 24203370 Tubes and pipes, of circular cross-section, hot or cold formed and welded, of an external diameter <= 406.4 mm, of steel other than stainless steel