WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

C21C　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)

C21C 1/00 Refining of pig-iron; Cast iron

C21C 1/02 ・Dephosphorising or desulfurising

C21C 1/025 ・・{Agents used for dephosphorising or desulfurising}

C21C 1/04 ・Removing impurities other than carbon, phosphorus or sulfur

C21C 1/06 ・Constructional features of mixers for pig-iron

C21C 1/08 ・Manufacture of cast-iron

C21C 1/10 ・Making spheroidal graphite cast-iron

C21C 1/105 ・・{Nodularising additive agents}

C21C 3/00 Manufacture of wrought-iron or wrought-steel

C21C 5/00 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)}

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

C21C 5/28 ・Manufacture of steel in the converter {(C21C 5/005 takes precedence)}

C21C 5/285 ・・{Plants therefor}

C21C 5/30 ・・Regulating or controlling the blowing

C21C 5/305 ・・・{Afterburning}

C21C 5/32 ・・・Blowing from above (C21C 5/35 takes precedence)

C21C 5/34 ・・・Blowing through the bath (C21C 5/35 takes precedence)

C21C 5/35 ・・・Blowing from above and through the bath

C21C 5/36 ・・Processes yielding slags of special composition

C21C 5/38 ・・Removal of waste gases or dust

C21C 5/40 ・・・Offtakes or separating apparatus for converter waste gases or dust

C21C 5/42 ・・Constructional features of converters

C21C 5/44 ・・・Refractory linings

C21C 5/441 ・・・・{Equipment used for making or repairing linings}

C21C 5/443 ・・・・・{Hot fettling; Flame gunning}

C21C 5/445 ・・・・{Lining or repairing the taphole}

C21C 5/46 ・・・Details or accessories

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 5/4633 ・・・・{Supporting means}

C21C 5/464 ・・・・・{Trunnion bearings}

C21C 5/4646 ・・・・{Cooling arrangements}

C21C 5/4653 ・・・・{Tapholes; Opening or plugging thereof}

C21C 5/466 ・・・・{Charging device for converters}

C21C 5/4673 ・・・・{Measuring and sampling devices}

C21C 5/4686 ・・・・{Vehicles for supporting and transporting a converter vessel}

C21C 5/4693 ・・・・{Skull removal; Cleaning of the converter mouth}

C21C 5/48 ・・・・Bottoms or tuyeres of converters

C21C 5/50 ・・・・Tilting mechanisms for converters

C21C 5/52 ・Manufacture of steel in electric furnaces ({C21C 5/005 takes precedence}; electric heating per se H05B)

C21C 5/5205 ・・{in a plasma heated furnace}

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 5/5229 ・・{in a direct current (DC) electric arc furnace}

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 5/5264 ・・{Manufacture of alloyed steels including ferro-alloys}

C21C 5/527 ・・{Charging of the electric furnace}

C21C 5/5294 ・・{General arrangement or layout of the electric melt shop}

C21C 5/54 ・・Processes yielding slags of special composition

C21C 5/56 ・Manufacture of steel by other methods (making liquid steel by direct processes C21B 13/00){(C21C 5/005 takes precedence)}

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}

C21C 7/00 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)

C21C 7/0006 ・{Adding metallic additives}

C21C 7/0025 ・{Adding carbon material}

C21C 7/0037 ・{by injecting powdered material}

C21C 7/0043 ・・{into the falling stream of molten metal}

C21C 7/005 ・{using exothermic reaction compositions}

C21C 7/0056 ・{using cored wires}

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 7/04 ・Removing impurities by adding a treating agent

C21C 7/06 ・・Deoxidising, e.g. killing

C21C 7/064 ・・Dephosphorising; Desulfurising

C21C 7/0645 ・・・{Agents used for dephosphorising or desulfurising}

C21C 7/068 ・・Decarburising

C21C 7/0685 ・・・{of stainless steel}

C21C 7/072 ・・Treatment with gases (C21C 7/06, C21C 7/064, C21C 7/068 take precedence)

C21C 7/076 ・・Use of slags or fluxes as treating agents (C21C 7/06, C21C 7/064, C21C 7/068 take precedence)

C21C 7/10 ・Handling in a vacuum

C21C 2005/00 Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel {or stainless steel}

C21C 2005/28 ・Manufacture of steel in the converter {(C21C 5/005 takes precedence)}

C21C 2005/36 ・・Processes yielding slags of special composition

C21C 2005/363 ・・・Slag cements

C21C 2005/366 ・・・Foam slags

C21C 2005/42 ・・Constructional features of converters

C21C 2005/44 ・・・Refractory linings

C21C 2005/445 ・・・・{Lining or repairing the taphole}

C21C 2005/446 ・・・・・Dry linings

C21C 2005/448 ・・・・Lining wear indicators

C21C 2005/46 ・・・Details or accessories

C21C 2005/4606 ・・・・{Lances or injectors}

C21C 2005/4626 ・・・・・Means for cooling, e.g. by gases, fluids or liquids

C21C 2005/466 ・・・・{Charging device for converters}

C21C 2005/4666 ・・・・・for charging with organic contaminated scrap

C21C 2005/4673 ・・・・{Measuring and sampling devices}

C21C 2005/468 ・・・・・Means for determining the weight of the converter

C21C 2005/52 ・Manufacture of steel in electric furnaces ({C21C 5/005 takes precedence}; electric heating per se H05B)

C21C 2005/5211 ・・{in an alternating current (AC) electric arc furnace}

C21C 2005/5223 ・・・with post-combustion

C21C 2005/5229 ・・{in a direct current (DC) electric arc furnace}

C21C 2005/5235 ・・・with bottom electrodes

C21C 2005/5258 ・・with crater formed by down-melting of scrap or charge through electrode or lance

C21C 2005/527 ・・{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 2007/00 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)

C21C 2007/0006 ・{Adding metallic additives}

C21C 2007/0012 ・・Lead

C21C 2007/0018 ・・Boron

C21C 2007/0025 ・{Adding carbon material}

C21C 2007/0031 ・・being plastics, organic compounds, polymers

C21C 2007/0056 ・{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 2007/0093 ・Duplex process; Two stage processes

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

C21C 2250/00 Specific additives ; Means for adding material different from burners or lances

C21C 2250/02 ・Hot oxygen

C21C 2250/04 ・Liquid gas

C21C 2250/042 ・・Liquid oxygen

C21C 2250/06 ・Hollow electrode

C21C 2250/08 ・Porous plug

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