7304: Tube or hollow profile, seamless iron/steel not cast

730410: Pipes, line, iron or steel, for oil or gas pipelines 730420: Casings, tubing and drill pipe, for oil drilling 730431: Iron/non-alloy steel pipe, cold drawn/rolled, nes 730439: Iron/non-alloy steel pipe or tubing, nes 730441: Stainless steel pipe or tubing, cold rolled 730449: Stainless steel pipe or tubing, except cold rolled 730451: Alloy steel pipe or tubing, cold rolled 730459: Alloy steel pipe or tubing, except cold rolled 730490: Iron or steel tubes, pipes or hollow profiles, nes 7304: Tube or hollow profile, seamless iron/steel not cast