| 420 / | HD | ALLOYS OR METALLIC COMPOSITIONS |
| 8 | DF | FERROUS (I.E., IRON BASE) {24} |
| 104 | DF | .~ Chromium containing, but less than 9 percent {4} |
| 105 | | .~.~ Molybdenum containing {5} |
| 106 | DF | .~.~.~> Boron or beryllium containing |
| 107 | DF | .~.~.~> Cobalt containing |
| 108 | DF | .~.~.~> Nickel containing {1} |
| 110 | DF | .~.~.~> Titanium, zirconium or niobium containing |
| 111 | DF | .~.~.~> Vanadium containing |