MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS (cementation by diffusion processes C 23 C; surface treatment of metallic material involving at least one process provided for in class C 23 and at least one process covered by this subclass C 23 F 17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C 30 B)
Note
In this subclass, it is desirable to add the indexing codes of subclass C 22 K, relating to changing the physical characteristics of alloys. The indexing codes should be unlinked. [6]
1
/
00
General methods or devices for heat treatments, e.g. annealing, hardening, quenching, tempering (furnaces in general F 27; electric heating H 05 B)
1
/
02
Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
1
/
04
with simultaneous application of supersonic waves, magnetic or electric fields
1
/
06
Surface hardening
1
/
08
with flames
1
/
09
by direct application of electrical or wave energy; by particle radiation [3]
1
/
10
by electric induction [3]
1
/
18
Hardening (C 21 D 1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C 21 D 1/62) [3]
1
/
19
by interrupted quenching [3]
1
/
20
Isothermal quenching, e.g. bainitic hardening [3]
1
/
22
Martempering [3]
1
/
25
Hardening, combined with annealing between 300°C and 600°C, i.e. heat refining ("Vergόten") [3]
Determining when the hardening temperature has been reached by measurement of magnetic or electrical properties
1
/
55
Hardenability tests, e.g. end-quench tests (investigating or analysing materials by determining their chemical or physical properties, in general G 01 N) [3]
1
/
56
characterised by the quenching agents
1
/
58
Oils
1
/
60
Aqueous agents
1
/
607
Molten salts [3]
1
/
613
Gases; Liquefied or solidified normally gaseous material [3]
