| 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 | DF | .~.~ Molybdenum containing {5} |
| 108 | | .~.~.~ Nickel containing {1} |
| 109 | DF | .~.~.~.~> Vanadium, titanium or zirconium containing |