during manufacturing of articles with special electromagnetic properties

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment > during manufacturing of articles with special electromagnetic properties

CPC:

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) > during manufacturing of articles with special electromagnetic properties

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2026.

Child Classifications

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C21D 8/1205 involving particular fabrication steps or treatments of ingots or slabs since 2026 +1 CPC IPC+CPC Available in IPC and CPC
C21D 8/1216 characterised by the working steps since 2026 +4 CPC IPC+CPC Available in IPC and CPC
C21D 8/1244 characterised by the heat treatment since 2026 +5 CPC IPC+CPC Available in IPC and CPC
C21D 8/1277 involving a particular surface treatment (C21D8/1294 takes precedence) since 2026 +2 CPC IPC+CPC Available in IPC and CPC
C21D 8/1294 involving a localised treatment since 2026 IPC+CPC Available in IPC and CPC