CPC Definition - Subclass C21C
This place covers:
all treatments of molten iron or steel, including the apparatuses specifically related thereto, e.g. converter, electric furnace.
This place does not cover:
Cast iron alloys | |
Ferrous alloy compositions |
This place covers:
Also the specific treating agents
Attention is drawn to the following places, which may be of interest for search:
Dephosphorising or desulfurising of molten ferrous alloys |
In case the dephosphorising, desulfurising are more generally claimed and could also apply to ferrous alloys (incl. steel), C21C 7/064 should be attributed as well.
If the method of introduction is specifically claimed, the corresponding class in C21C 7/00 should be attributed
Attention is drawn to the following places, which may be of interest for search:
In case the treatments to remove other impurities are more generally claimed and could also apply to ferrous alloys (incl. steel), C21C 7/04 or any appropriate class below should be attributed as well.
If the method of introduction is specifically claimed, the corresponding class in C21C 7/00 should be attributed
Attention is drawn to the following places, which may be of interest for search:
Stirring devices for molten metal |
This place covers:
Treatment of pig iron to obtain non-spheroidal cast-iron.
This place does not cover:
Cast-iron alloys (composition) |
Attention is drawn to the following places, which may be of interest for search:
Making of cast-iron alloys |
This place covers:
Also the nodularising agents
Attention is drawn to the following places, which may be of interest for search:
Making of cast-iron alloys | |
Cast-iron alloys |
This place covers:
Also the manufacturing of stainless steels and ferro-alloys; apparatuses, in particular converters, which are specifically dedicated to the steel processing are classified within this group as well
This place does not cover:
Ferrous alloy compositions |
This place covers:
Also the full plant lay-out.
This place covers:
Converter processes in which the regulation or control of the blowing is claimed, be it from above, through the bath or a combination thereof, i.e. not specific to one of the methods ; the regulation or control can relate to the amount, the sequence, the composition etc of the gases.
Also post-combustion is considered as a means to control the blowing
In patent documents, the following abbreviations are often used:
Post-combustion | after burning |
This place covers:
Regulation or control of blowing only through the melt, i.e. through a tuyere or bottom
This place does not cover:
Tuyere details |
This place covers:
The treatment of the off-gas
Attention is drawn to the following places, which may be of interest for search:
Separation | |
In particular of solids from gases or vapours by gravity, inertia or centrifugal forces | |
By filters | |
By liquids | |
By other means | |
Purifying or modifying the chemical composition of combustible gases containing CO |
This place covers:
The installation required for capturing and treating of the off-gas.
Attention is drawn to the following places, which may be of interest for search:
Preventing escape from fumes from the area where they are produces, collecting or removing fumes therefrom | |
Devices for conducting smoke or fumes for factories or large buildings | |
Arrangements for using waste heat, using or disposing of waste gas |
This place covers:
Apart from the lining itself, the equipment to make, apply or repair the lining, both of the vessel and of the taphole in particular.
This place covers:
Lances, means for their handling; supporting means for the converter; cooling arrangements; tapholes, their opening and sealing; charging devices; measuring and sampling devices; support and transport devices for the converter; cleaning and skull removal.
Attention is drawn to the following places, which may be of interest for search:
Measuring the weight of the converter | |
Trunnions in generalbearings and accessories in general | |
Charging of furnaces | |
Travelling or movable supports for the charge | |
Tapholes, opening and sealing | |
Lances injecting a gas jet; injecting particulate material using a fluid jet | |
Devices or methods for removing incrustrations | |
Arrangements of controlling devices | |
Arrangements of monitoring devices | |
Measuring, testing in general of weight of vibrations or ultra-, infra- or sonic waves radiation pyrometry other temperature measurements | |
Specific techniques for measuring or analysing materials by determining their chemical or physical properties |
Attention is drawn to the following places, which may be of interest for search:
Pivotal connections in general ; | |
Bearings and accessories in general |
This place covers:
Any type of electric heating : AC, DC, induction or plasma, incl. accessories as burners.
The manufacturing of alloyed steels, incl. ferro-alloys.
The charging of the electric furnace.
Multiple hearth furnaces.
The general lay-out of the melt shop.
Attention is drawn to the following places, which may be of interest for search:
Methods or apparatus for combustion using fluent fuel | |
Burners | |
Electrically heated hearth furnaces hearth furnaces in general and their accessories | |
Arrangements of elements for electric heating in or on furnaces | |
Electric heating elements or system | |
Electric heating in general |
specific Indexing Codes exist for the presence/absence of a foam or a molten heel in the electric furnace
This place covers:
Also methods starting from scrap (with/without preheating) not treated in electric (arc) furnaces
This place covers:
Treatments of refining or alloying by means of the treatment agents, the form thereof, purpose or the circumstances.
Metallic, carbonaceous or exothermic treatment agents.
Loose or compacted agents or cored wires.
Treatments in a ladle, under pressure or in a current of streaming metal;
special treatments of the slag.
This place covers:
Including specifically disclosed agents for desulfurising and dephosphorising
Attention is drawn to the following places, which may be of interest for search:
Removal of phosphor or sulfur from pig iron |
This place covers:
Including stainless steels
Attention is drawn to the following places, which may be of interest for search:
Refining metals by treating with gases |
Attention is drawn to the following places, which may be of interest for search:
Refining metals by treating with fluxes |