| 148 / | HD | METAL TREATMENT |
|
| 95 | DF | PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17} |
| 206 | DF | .~ Carburizing or nitriding using externally supplied carbon or nitrogen source {15} |
| 225 |  | .~.~ Iron(Fe) or iron base alloy {7} |
| 226 | DF | .~.~.~> With working, machining, or cutting |
| 227 | DF | .~.~.~> Utilizing fused agent or media {2} |
| 230 | DF | .~.~.~> Nitriding {2} |
| 233 | DF | .~.~.~> With post-carburizing heating or quenching |
| 234 | DF | .~.~.~> Utilizing agent containing cyano (CN) radical or halogen (X) radical or metal carbonate |
| 235 | DF | .~.~.~> Utilizing hydrocarbon, oil or oxygenated hydrocarbon (e.g., alcohol, furan, carbohydrate, etc.) |
| 236 | DF | .~.~.~> Utilizing solid carbonaceous material containing free carbon, coal, peat, or coke |