730610 Line pipe of a kind used for oil or gas pipelines
730620 Casing and tubing of a kind used in drilling for oil or gas of Iron or Steel, Open Seam or Welded, Riveted
730630 Other Tubes, Pipes, Hollow Profiles, , welded, of circular cross section, of iron or nonalloy steel
730640 Other Tubes, Pipes, Hollow Profiles, , welded, of circular cross section, of stainless steel
730650 Other Tubes, Pipes, Hollow Profiles, , welded, of circular cross section, of other alloy steel
730660 Other Tubes, Pipes, Hollow Profiles, , welded, of non-circular cross section
730690 Other Tubes, Pipes, Hollow Profiles, of Iron or Steel, Open Seam, Riveted
