Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings
C 21 D 1/72; furnaces in general F 27)
3
/
02
•
Extraction of non-metals
3
/
04
•
•
Decarburising
3
/
06
•
•
Extraction of hydrogen
3
/
08
•
•
Extraction of nitrogen
3
/
10
•
Furnaces therefor
5
/
00
Heat treatments of cast-iron
5
/
02
•
improving the malleability of grey cast-iron
5
/
04
•
of white cast-iron
5
/
06
•
•
Malleabilising
5
/
08
•
•
•
with oxidation of carbon
5
/
10
•
•
•
•
in gaseous agents
5
/
12
•
•
•
•
in solid agents
5
/
14
•
•
•
Graphitising
5
/
16
•
•
•
•
Packing agents
6
/
00
Heat treatment of ferrous alloys [2]
6
/
02
•
Hardening by precipitation [2]
6
/
04
•
Hardening by cooling below 0 C [2]
7
/
00
Modifying the physical properties of iron or steel by deformation (apparatus for mechanical working of metal B 21, B 23, B 24, e.g. shot-peening
B 24 C)
7
/
02
•
by cold working
7
/
04
•
•
of the surface
7
/
06
•
•
•
by shot-peening or the like
7
/
08
•
•
•
by burnishing or the like
7
/
10
•
•
of the whole cross-section, e.g. of concrete reinforcing bars
7
/
12
•
•
•
by expanding tubular bodies
7
/
13
•
by hot working
8
/
00
Modifying the physical properties 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 C 21 D 1/02
) [3]
8
/
02
•
during manufacturing of plates or strips (C 21 D 8/12 takes precedence) [3]
8
/
04
•
•
to produce plates or strips for deep-drawing [3]
8
/
06
•
during manufacturing of rods or wires [3]
8
/
08
•
•
for concrete reinforcement [3]
8
/
10
•
during manufacturing of tubular bodies [3]
8
/
12
•
during manufacturing of articles with special electromagnetic properties [3]
9
/
00
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor (furnaces in general F 27)
9
/
02
•
for springs
9
/
04
•
for rails (apparatus for heat treatment of railway rails on the spot E 01 B 31/18)
9
/
06
•
•
with diminished tendency to become wavy
9
/
08
•
for tubular bodies or pipes
9
/
10
•
•
shotgun barrels
9
/
12
•
•
barrels for ordnance
9
/
14
•
•
wear- or pressure-resistant pipes
9
/
16
•
for explosive shells
9
/
18
•
for knives, scythes, scissors, or like hand cutting tools
9
/
20
•
for blades for skates
9
/
22
•
for drills; for milling cutters; for machine cutting tools
9
/
24
•
for saw blades
9
/
26
•
for needles; for teeth for card-clothing
9
/
28
•
for plain shafts
9
/
30
•
for crankshafts; for camshafts
9
/
32
•
for gear wheels, worm wheels, or the like
9
/
34
•
for tyres; for rims
9
/
36
•
for balls; for rollers
9
/
38
•
for roll bodies
9
/
40
•
for rings; for bearing races
9
/
42
•
for armour plate
9
/
44
•
for equipment for lining mine shafts, e.g. segments, rings, props
9
/
46
•
for sheet metals
9
/
48
•
•
deep-drawing sheets
9
/
50
•
for welded joints
9
/
52
•
for wires; for strips
9
/
54
•
•
Furnaces for treating strips or wire
9
/
56
•
•
•
Continuous furnaces for strip or wire
9
/
567
•
•
•
•
with heating in fluidised beds [3]
9
/
573
•
•
•
•
with cooling [3]
9
/
58
•
•
•
•
with heating by baths
9
/
60
•
•
•
•
with induction heating
9
/
62
•
•
•
•
with direct resistance heating
9
/
63
•
•
•
•
the strip being supported by a cushion of gas [3]
9
/
64
•
•
•
Patenting furnaces
9
/
66
•
•
•
Tower-type furnaces
9
/
663
•
•
•
Bell-type furnaces [3]
9
/
665
•
•
•
•
inverted or side-facing [3]
9
/
667
•
•
•
•
Multi-station furnaces [3]
9
/
67
•
•
•
•
•
adapted for treating the charge in vacuum or special atmosphere [3]
9
/
673
•
•
•
•
Details, accessories, or equipment peculiar to bell-type furnaces [3]
9
/
675
•
•
•
•
Arrangements of charging or discharging devices [3]
9
/
677
•
•
•
•
Arrangements of heating devices [3]
9
/
68
•
•
•
Furnace coilers; Hot coilers (cold coilers B 21 C)
9
/
70
•
Furnaces for ingots, i.e. soaking pits
10
/
00
Modifying the physical properties by methods other than heat treatment or deformation [3]
11
/
00
Process control or regulation for heat treatments (controlling or regulating in general G 05) [2]
