Section 15 Base metals and articles of base metal 75 Nickel and articles thereof 75 07 Nickel tubes, pipes and tube or pipe fittings (for example, couplings, elbows, sleeves) Commodity Code Description 75 07 11 - - Of nickel, not alloyed 75 07 12 - - Of nickel alloys 75 07 20 - Tube or pipe fittings