242031 Line pipe of a kind used for oil or gas pipelines, welded, of an external diameter of = 406,4 mm, of steel

24203110 Line pipe, of a kind used for oil or gas pipelines, longitudinally or spirally welded, of an external diameter <= 406.4 mm, of stainless steel 24203150 Line pipe, of a kind used for oil or gas pipelines, longitudinally or spirally welded, of an external diameter <= 406.4mm, of steel other than stainless steel