|  | C |
SECTION C — CHEMISTRY AND METALLURGY

METALLURGY

|  | C22 |
METALLURGY (of iron Fulltext... Hierarchy... Expanded...C21); FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR OF NON-FERROUS METALS

|  | C22B |
PRODUCTION AND REFINING OF METALS (electrothermic Fulltext... Hierarchy... Expanded...C22D); PRETREATMENT OF RAW MATERIALS

|  | C22B |
Note(s) In this sub-class, groups for obtaining metals include obtaining the metals by non-metallurgical processes, and obtaining metal compounds by metallurgical processes. Thus, for example, group Fulltext... Hierarchy... Expanded...C22B 11/00 covers the production of silver by reduction of ammoniacal silver oxide in solution, and group Fulltext... Hierarchy... Expanded...C22B 17/00 includes the production of cadmium oxide by a metallurgical process. Furthermore, although compounds of arsenic and antimony are classified in Fulltext... Hierarchy... Expanded...C01B, production of the elements themselves is included in Fulltext... Hierarchy... Expanded...C22B, as well as the production of their compounds by metallurgical processes.

|  | C22C |
NON-FERROUS ALLOYS (heat treatment thereof Fulltext... Hierarchy... Expanded...C22F); FERROUS ALLOYS; TREATMENT THEREOF

|  | C22D |
ELECTROLYTIC AND ELECTROTHERMIC PRODUCTION AND REFINING OF METALS

|  | C22F |
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS