Section 15 Base metals and articles of base metal 74 Copper and articles thereof 74 11 Copper tubes and pipes 74 11 22 Of copper-nickel base alloy (cupro-nickel) or copper-nickel-zinc base alloys...., Commodity Code Description 74 11 22 00 Of copper-nickel base alloy (cupro-nickel) or copper-nickel-zinc base alloys....,