| 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} |
| 675 | DF | .~.~ Nickel(Ni) or nickel base alloy {1} |
| 676 | | .~.~.~ With working {1} |
| 677 | DF | .~.~.~.~> With ageing, solution treating, (i.e., for hardening), precipitation hardening or strengthening |