| 420 / | HD | ALLOYS OR METALLIC COMPOSITIONS |
| 528 | DF | ALUMINUM BASE {7} |
| 529 | DF | .~ Copper containing {6} |
| 533 | DF | .~.~ Magnesium containing {1} |
| 534 | | .~.~.~ Silicon containing {2} |
| 535 | DF | .~.~.~.~> Titanium, zirconium, hafnium, vanadium, niobium, or tantalum containing |
| 536 | DF | .~.~.~.~> Cadmium, lead or bismuth containing |