| 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} |
| 579 | DF | .~.~ Iron(Fe) or iron base alloy {24} |
| 605 | DF | .~.~.~ Nine percent or more chromium(Cr) (e.g., Stainless steel, etc.) {4} |
| 607 | DF | .~.~.~.~ Ageing, solution treating (i.e., for hardening), precipitation strengthening or precipitation hardening {1} |
| 608 | | .~.~.~.~.~ With working |