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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS (refining metals in general C22B 9/00)
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C21C 1/00
Refining of pig-iron; Cast iron
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.
Dephosphorising or desulfurising
C21C 1/025
. .
{
Agents used for dephosphorising or desulfurising
}
.
Removing impurities other than carbon, phosphorus or sulfur
.
Constructional features of mixers for pig-iron
.
Manufacture of cast-iron
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.
Making spheroidal graphite cast-iron
C21C 1/105
. .
{
Nodularising additive agents
}
C21C 3/00
Manufacture of wrought-iron or wrought-steel
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Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel
{
or stainless steel
}
C21C 5/005
.
{
Manufacture of stainless steel
}
C21C 5/02
.
Crucible furnace process
{
(C21C 5/005 takes precedence)
}
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C21C 5/04
.
Manufacture of hearth-furnace steel, e.g. Siemens-Martin steel
{
(C21C 5/005 takes precedence)
}
C21C 5/06
. .
Processes yielding slags of special composition
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Manufacture of steel in the converter
{
(C21C 5/005 takes precedence)
}
C21C 5/285
. .
{
Plants therefor
}
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. .
Regulating or controlling the blowing
C21C 5/305
. . .
{
Afterburning
}
. . .
Blowing from above (C21C 5/35 takes precedence)
. . .
Blowing through the bath (C21C 5/35 takes precedence)
C21C 5/35
. . .
Blowing from above and through the bath
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C21C 5/36
. .
Processes yielding slags of special composition
C21C 2005/363
. . .
{
Slag cements
}
C21C 2005/366
. . .
{
Foam slags
}
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. .
Removal of waste gases or dust
. . .
Offtakes or separating apparatus for converter waste gases or dust
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C21C 5/42
. .
Constructional features of converters
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. . .
Refractory linings
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C21C 5/441
. . . .
{
Equipment used for making or repairing linings
}
C21C 5/443
. . . . .
{
Hot fettling; Flame gunning
}
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C21C 5/445
. . . .
{
Lining or repairing the taphole
}
C21C 2005/446
. . . . .
{
Dry linings
}
C21C 2005/448
. . . .
{
Lining wear indicators
}
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. . .
Details or accessories
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C21C 5/4606
. . . .
{
Lances or injectors
}
C21C 5/4613
. . . . .
{
Refractory coated lances; Immersion lances
}
C21C 5/462
. . . . .
{
Means for handling, e.g. adjusting, changing, coupling
}
C21C 2005/4626
. . . . .
{
Means for cooling, e.g. by gases, fluids or liquids
}
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C21C 5/4633
. . . .
{
Supporting means
}
C21C 5/464
. . . . .
{
Trunnion bearings
}
C21C 5/4646
. . . .
{
Cooling arrangements
}
C21C 5/4653
. . . .
{
Tapholes; Opening or plugging thereof
}
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C21C 5/466
. . . .
{
Charging device for converters
}
C21C 2005/4666
. . . . .
{
for charging with organic contaminated scrap
}
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C21C 5/4673
. . . .
{
Measuring and sampling devices
}
C21C 2005/468
. . . . .
{
Means for determining the weight of the converter
}
C21C 5/4686
. . . .
{
Vehicles for supporting and transporting a converter vessel
}
C21C 5/4693
. . . .
{
Skull removal; Cleaning of the converter mouth
}
. . . .
Bottoms or tuyéres of converters
. . . .
Tilting mechanisms for converters
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Manufacture of steel in electric furnaces (
{
C21C 5/005 takes precedence
}
; electric heating per se H05B)
C21C 5/5205
. .
{
in a plasma heated furnace
}
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C21C 5/5211
. .
{
in an alternating current (AC) electric arc furnace
}
C21C 5/5217
. . .
{
equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
}
C21C 2005/5223
. . .
{
with post-combustion
}
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C21C 5/5229
. .
{
in a direct current (DC) electric arc furnace
}
C21C 2005/5235
. . .
{
with bottom electrodes
}
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C21C 5/5241
. .
{
in an inductively heated furnace
}
C21C 5/5247
. . .
{
processing a moving metal stream while exposed to an electromagnetic field, e.g. in an electromagnetic counter current channel
}
C21C 5/5252
. .
{
in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
}
C21C 2005/5258
. .
{
with crater formed by down-melting of scrap or charge through electrode or lance
}
C21C 5/5264
. .
{
Manufacture of alloyed steels including ferro-alloys
}
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C21C 5/527
. .
{
Charging of the electric furnace
}
C21C 2005/5276
. . .
{
with liquid or solid rest, e.g. pool, "sumpf"
}
C21C 2005/5282
. . .
{
with organic contaminated scrap
}
C21C 2005/5288
. .
{
Measuring or sampling devices
}
C21C 5/5294
. .
{
General arrangement or layout of the electric melt shop
}
C21C 5/54
. .
Processes yielding slags of special composition
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Manufacture of steel by other methods (making liquid steel by direct processes C21B 13/00)
{
(C21C 5/005 takes precedence)
}
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C21C 5/562
. .
{
starting from scrap
}
C21C 5/565
. . .
{
Preheating of scrap (apparatus for preheating scrap in general F27D 13/002)
}
C21C 5/567
. .
{
operating in a continuous way
}
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Treating molten ferrous alloys, e.g. steel, not covered by groups C21C 1/00 to C21C 5/00 (treating molten metals during moulding B22D 1/00, B22D 27/00; remelting ferrous metals C22B)
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C21C 7/0006
.
{
Adding metallic additives
}
C21C 2007/0012
. .
{
Lead
}
C21C 2007/0018
. .
{
Boron
}
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C21C 7/0025
.
{
Adding carbon material
}
C21C 2007/0031
. .
{
being plastics, organic compounds, polymers
}
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C21C 7/0037
.
{
by injecting powdered material
}
C21C 7/0043
. .
{
into the falling stream of molten metal
}
C21C 7/005
.
{
using exothermic reaction compositions
}
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C21C 7/0056
.
{
using cored wires
}
C21C 2007/0062
. .
{
with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet
}
C21C 7/0068
.
{
by introducing material into a current of streaming metal
}
C21C 7/0075
.
{
Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
}
C21C 7/0081
.
{
Treating and handling under pressure
}
C21C 7/0087
.
{
Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
}
C21C 2007/0093
.
{
Duplex process; Two stage processes
}
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Removing impurities by adding a treating agent
C21C 7/06
. .
Deoxidising, e.g. killing
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Dephosphorising; Desulfurising
C21C 7/0645
. . .
{
Agents used for dephosphorising or desulfurising
}
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. .
Decarburising
C21C 7/0685
. . .
{
of stainless steel
}
. .
Treatment with gases (C21C 7/06, C21C 7/064, C21C 7/068 take precedence)
. .
Use of slags or fluxes as treating agents (C21C 7/06, C21C 7/064, C21C 7/068 take precedence)
.
Handling in a vacuum
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C21C 2100/00
Exhaust gas
C21C 2100/02
.
Treatment of the exhaust gas
C21C 2100/04
.
Recirculation of the exhaust gas
C21C 2100/06
.
Energy from waste gas used in other processes
C21C 2200/00
Recycling of waste material
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C21C 2250/00
Specific additives ; Means for adding material different from burners or lances
C21C 2250/02
.
Hot oxygen
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C21C 2250/04
.
Liquid gas
C21C 2250/042
. .
Liquid oxygen
C21C 2250/06
.
Hollow electrode
C21C 2250/08
.
Porous plug
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C21C 2300/00
Process aspects
C21C 2300/02
.
Foam creation
C21C 2300/04
.
Avoiding foam formation
C21C 2300/06
.
Modeling of the process , e.g. for control purposes ; CII
C21C 2300/08
.
Particular sequence of the process steps
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013