Analysis
HTS 7503.00.00 covers nickel waste and scrap under heading 7503 (nickel waste and scrap).
The normal trade relations rate here is zero, shared by about 21% of the 28 tariff lines in chapter 75, a useful check when a neighbouring dutiable line is a candidate. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
It is the only US line under subheading 7503.00, so the six-digit code used by every Harmonized System country and the eight-digit US line describe the same goods; a foreign tariff or an exporter's invoice showing 7503.00 points straight here.
The general rate of Free has not changed in any edition of the schedule since Jan 2023.