Line pipe of a kind used for oil or gas pipelines, having circular cross-sections and an external diameter of 406,4 mm, of iron or steel, longitudinally submerged arc welded
Line pipe of a kind used for oil or gas pipelines, having circular cross-sections and an external diameter of 406,4 mm, of iron or steel, longitudinally arc welded (excluding products longitudinally submerged arc welded)
Line pipe of a kind used for oil or gas pipelines, having circular cross-sections and an external diameter of 406,4 mm, of flat-rolled products of iron or steel (excluding products longitudinally arc welded)
Casing of a kind used in drilling for oil or gas, having circular cross-sections and an external diameter of 406,4 mm, of flat-rolled products of iron or steel
Tubes and pipes having circular cross-sections and an external diameter of 406,4 mm, of iron or steel, longitudinally welded (excluding products of a kind used for oil or gas pipelines or of a kind used in drilling for oil or gas)
Tubes and pipes having circular cross-sections and an external diameter of 406,4 mm, of iron or steel, welded (excluding products longitudinally welded or of a kind used for oil or gas pipelines or of a kind used in drilling for oil or gas)
Tubes and pipes having circular cross-sections and an external diameter of 406,4 mm, of flat-rolled products of iron or steel, welded (excluding welded products or products of a kind used for oil or gas pipelines or of a kind used in drilling for oil or gas)