| 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} |
| 500 | DF | .~ Utilizing disclosed mathematical formula or relationship {3} |
| 505 | ![]() | .~.~ Utilizing therein factors or percentages related to metal or metal alloy composition (i.e., including carbon content) {2} |
| 506 | DF | .~.~.~> With chromium(Cr) in the mathematical relationship |
| 507 | DF | .~.~.~> With titanium(Ti) in the mathematical relationship |