FI (Note)/(Index) list

Descriptions for C21D and notes/indexes are displayed on this screen.

C21D MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (cementation by diffusion processes C23C; surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F 17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)

Note(s)
    Cementation by diffusion processes is classified in C23C [2012.01]Surface treatments of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass—are classified in group C23F 17/00 

Subclass indexes

HEAT TREATMENT

General methods or devices

1/00, 11/00

of cast-iron, of iron alloys

5/00, 6/00

adapted for particular articles

9/00

MECHANICAL TREATMENT

7/00

COMBINED MECHANICAL AND THERMAL TREATMENTS

8/00

OTHER TREATMENTS

10/00

DIFFUSION PROCESSES FOR EXTRACTION OF NON-METALS

3/00