| 420 / | HD | ALLOYS OR METALLIC COMPOSITIONS |
| 8 | DF | FERROUS (I.E., IRON BASE) {24} |
| 34 | DF | .~ Nine percent or more chromium containing {14} |
| 43 | DF | .~.~ Eight percent or more nickel containing {6} |
| 52 | | .~.~.~ Molybdenum containing {1} |
| 53 | DF | .~.~.~.~> Group IV or V transition metal containing |