Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 04 Tubes, pipes and hollow profiles, seamless, of iron (excl. cast), steel 73 04 23 With yield strength less than 80,000 psi and not threaded pipe-end 73 04 23 10 With yield strength less than 80,000 psi and not threaded pipe-end Commodity Code Description 73 04 23 10 00 With yield strength less than 80,000 psi and not threaded pipe-end