Subheading 730611: Steel; Stainless; Line Pipe of a Kind Used for Oil or Gas Pipeline … etc.
Subheading 730619: Iron or Steel (Excluding Cast Iron); Line Pipe of a Kind Used for … etc.
Subheading 730621: Steel, Stainless; Casing and Tubing of a Kind Used in Drilling for … etc.
Subheading 730629: Iron or Steel (Excluding Cast Iron); Casing and Tubing of a Kind U … etc.
Subheading 730630: Iron or Non-alloy Steel (Excluding Cast Iron); Tubes and Pipes (no … etc.
Subheading 730640: Steel, Stainless; Tubes, Pipes and Hollow Profiles, Welded, of Cir … etc.
Subheading 730650: Steel, Alloy; Tubes, Pipes and Hollow Profiles (other than Stainle … etc.
Subheading 730661: Iron or Steel (Excluding Cast Iron); Tubes, Pipes and Hollow Profi … etc.
Subheading 730669: Iron or Steel (Excluding Cast Iron); Tubes, Pipes and Hollow Profi … etc.
Subheading 730690: Iron or Steel (Excluding Cast Iron); Tubes, Pipes and Hollow Profi … etc.