The classification turns on the material of the working part, meaning the cutting teeth or tips. A circular blade whose teeth are tipped with tungsten carbide has a non-steel working part and belongs under 820239, not 820231, even though the blade body itself is steel. Importers should confirm the tip material with the manufacturer before declaring the HTS line.

Section 232 measures target steel and aluminum as materials, not finished tool products. Saw blades are classified as tools under Chapter 82, not as steel mill products, so Section 232 does not generally apply. However, antidumping or Section 301 measures may apply depending on origin and the specific tariff line; verify with a licensed customs broker.