| 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} |
| 559 | DF | .~ Heating or cooling of solid metal {22} |
| 688 | DF | .~.~ Aluminum(Al) or aluminum base alloy {5} |
| 698 | DF | .~.~.~ With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening {2} |
| 702 | | .~.~.~.~ Magnesium(Mg) containing |