- Pipes, seamless steel (9)
- Tubes, seamless steel (16)
- Tubing, mechanical or hypodermic sizes: cold drawn stainless (11)
- Boiler tubes (wrought) (1)
- Conduit: welded, lock joint, or heavy riveted (2)
- Pipes, wrought: welded, lock joint, or heavy riveted (7)
- Tubes, wrought: welded or lock joint (3)
- Well casing, wrought: welded, lock joint, or heavy riveted (1)
