CN101191171A - Method for processing ultra-pure ferrite stainless steel by using ladle refining furnace to control carbon and nitrogen content - Google Patents
Method for processing ultra-pure ferrite stainless steel by using ladle refining furnace to control carbon and nitrogen content Download PDFInfo
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- CN101191171A CN101191171A CNA200610118710XA CN200610118710A CN101191171A CN 101191171 A CN101191171 A CN 101191171A CN A200610118710X A CNA200610118710X A CN A200610118710XA CN 200610118710 A CN200610118710 A CN 200610118710A CN 101191171 A CN101191171 A CN 101191171A
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- 238000007670 refining Methods 0.000 title claims abstract description 67
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 29
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 23
- 239000010935 stainless steel Substances 0.000 title claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title abstract description 52
- 238000012545 processing Methods 0.000 title abstract description 4
- 239000007789 gas Substances 0.000 claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 27
- 239000010439 graphite Substances 0.000 claims abstract description 27
- 229910052786 argon Inorganic materials 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 238000005261 decarburization Methods 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000010079 rubber tapping Methods 0.000 claims abstract description 4
- 230000006698 induction Effects 0.000 claims abstract description 3
- 238000010891 electric arc Methods 0.000 claims description 14
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 7
- 230000003749 cleanliness Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001257 hydrogen Substances 0.000 abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005266 casting Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract 4
- 239000000571 coke Substances 0.000 abstract 2
- 239000002893 slag Substances 0.000 description 9
- 238000009749 continuous casting Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 241001062472 Stokellia anisodon Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009847 ladle furnace Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
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- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
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- 239000003518 caustics Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
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- 239000003517 fume Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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- 239000013535 sea water Substances 0.000 description 1
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- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a carbon and nitrogen content control method of processing super ferrite stainless steel with ladle refining furnace, comprising the procedures that, 1) during smelting ferrite stainless steel, arc furnace, induction furnace or converter are used for tapping, and argon oxygen decarburization furnace or vacuum oxygen decarburization furnace is used to reach the demand of steel liquid components of super ferrite stainless steel. 2) Ladle refinement: during power-on process, by blowing the mixture of coke oven gas and argon gas through the central hole of graphite electrodes, hydrogen containing plasma arc is formed at the lower end of graphite electrodes to achieve decarburization and denitrogen of liquid steel and guarantee the cleanness of liquid steel; among which the mixture proportion of coke oven gas and argon gas is between 95:5 and 5:95, with the pressure range between 0.02 and 10 MPa, the flow range of mixture gases between 0.01 and 50 Nm3/h; 3) During power-off process: gases blowing to the central hole of graphite electrodes are suspended; ladles are hung away from ladle refining furnace after components and temperature of steel liquid meet the requirement, and sent to the next procedure for casting.
Description
Technical field
The present invention relates to metallurgical technology field, particularly relate to the method that a kind of ladle refining furnace is handled super-purity ferrite stainless steel control carbon nitrogen content.
Background technology
Ferritic stainless steel has the anti-muriate more much better than austenitic stainless steel, caustic alkali equal stress corrosive nature, good seawater local corrosion performance and high temperature oxidation resistance, and it is cheap, thereby be widely used in the every field of national economy, as aspects such as household electrical appliance, kitchen utensil, hardware, automobile exhaust system, building and petrochemical compleies.The shortcoming of common ferritic stainless steel is to the intergranular corrosion sensitivity, and plasticity and toughness are all very low, prolong-brittle transition temperature is more than room temperature, and welding property is relatively poor.Relevant studies show that, the above-mentioned defective of ferritic stainless steel is owing to interstitial element C, N cause.The super-purity ferrite stainless steel of C+N≤150ppm can overcome above-mentioned shortcoming fully.
Super-purity ferrite stainless steel main employing vacuum refinement equipment (as VOD, SS-VOD) is at present produced.In recent years, the stainless steel plant is in order to realize the sequence casting of continuous casting, and improves the cleanliness factor of molten steel and accurate control composition, and before continuous casting, molten steel need pass through ladle refining furnace (Ladle Furnace is called for short LF, referring to Fig. 1) processing usually.As can be seen from Figure 1, adopt conventional LF flow process to produce in the super-purity ferrite stainless steel process, because the free electric arc that conventional ladle refining furnace (LF stove) adopts Graphite Electrodes and molten steel to produce heats molten steel, thereby heat-processed can produce the carburetting problem, in addition, because in the conventional LF operating process, composition of fumes around the electrode mainly is an air, and heat-processed electric arc can be with the nitrogen ionization in its ambient air, thereby can produce the nitrogen pick-up problem, and heat-up time is long more, carburetting nitrogen pick-up problem is serious more, is example with the 300t ladle refining furnace, usually under energising 30min condition, carbon increasing amount is 0.005%～0.01%, and nitrogen increased amount is greater than 0.002%.This makes often to cause with conventional ladle refining furnace (LF) production Ultra-low carbon, nitrogen ferritic stainless steel the time because of carbon nitrogen exceeds standard and causes the defective steel grade problem that changes of steel grades, product to be smelt the rate reduction.Because carburetting, nitrogen pick-up problem during ladle refining furnace refining ferritic stainless steel can't solve always, thereby can't be with the super-purity ferrite stainless steel of conventional ladle refining furnace (LF) refining Ultra-low carbon, nitrogen.
Summary of the invention
The object of the present invention is to provide a kind of ladle refining furnace to handle the method for super-purity ferrite stainless steel control carbon nitrogen content, be implemented in ladle refining furnace refining Ultra-low carbon, low nitrogen ferritic stainless steel.
For achieving the above object, technical scheme of the present invention is,
A kind of ladle refining furnace is handled the method for super-purity ferrite stainless steel control carbon nitrogen content, and it comprises the steps:
1) during the ferrite stainless smelting steel, furnace such as electric arc furnace, induction furnace or converter tapping originally, and make molten steel composition reach the requirement of super-purity ferrite stainless steel substantially by argon oxygen decarburizing furnace (AOD) or vacuum-oxygen decarbonizing stove (VOD);
2) ladle is transported to the ladle refining station, the beginning ladle refining, in galvanization, Graphite Electrodes centre hole winding-up coke-oven gas and argon gas mixed gas by ladle refining furnace, form hydrogeneous plasma arc in ladle refining furnace electrode lower end, realization guarantees the molten steel cleanliness factor simultaneously to molten steel decarburization, denitrogenation; Wherein, coke-oven gas and argon gas blending ratio are 95: 5～5: 95, and the pressure range of mixed gas is 0.02～10Mpa, and the flow range of mixed gas is 0.01～50Nm
3/ h;
When 3) having a power failure, stop, after molten steel composition, temperature are qualified, ladle is hung ladle refining furnace, send down to go on foot operation and pour into a mould to Graphite Electrodes centre hole blowing gas.
Again, the composition volume percent of described coke-oven gas is: H
250～60%, C
nH
m2～5%, CH
420～30%, CO
21～5%, CO 3～8%, O
20～1.0%, N 2～6%.
Utilize the method for the hollow graphite electrode winding-up coke-oven gas and the argon gas mixed gas (, forming hydrogeneous plasma arc) of ladle refining furnace (LF stove), realize LF stove refining super-purity ferrite stainless steel owing to contain a large amount of hydrogen in the coke-oven gas.
Because the Graphite Electrodes center of ladle refining LF stove is a hollow, be blown into above-mentioned mixed gas from this centre hole and make at Graphite Electrodes lower end formation plasma arc, injecting mixed gas ratio (scope of coke-oven gas and argon gas blending ratio is 95: 5～5: 95) is adjusted in dependence simultaneously, (pressure range of mixed gas is 0.02～10MPa) to pressure, (flow range of mixed gas is 0.01～50Nm to flow
3/ h) wait processing parameter to prevent that molten steel carburetting and realization to the molten steel denitrogenation, are implemented in the purpose of ladle refining furnace refining Ultra-low carbon, low nitrogen ferritic stainless steel.
Behind the winding-up coke-oven gas, form hydrogeneous plasma arc at electrode tip, when this electric arc existed, the following chemical reaction that takes place on the molten steel surface was a ultimate principle of removing nitrogen, carbon and oxygen in the molten steel effectively:
[N]+3H＝NH
3
[C]+4H＝CH
4
[O]+2H＝H
2O
[N]+H+C＝HCN
The ratio of injecting mixed gas can be adjusted the requirement of composition and purity according to smelting steel grade.In order to guarantee after the refining that hydrogen richness does not exceed standard in the steel, the gas that will feed arc region in the refining later stage switches to argon gas or refining to be finished the BOTTOM ARGON BLOWING of back by certain hour and stirs and be easy to hydrogen is removed to lower level.Therefore the present invention has overcome molten steel recarburization, the nitrogen pick-up problem of existing LF stove, can widen the scope that steel grade is handled greatly.
Conventional ladle refining furnace is handled super-purity ferrite stainless steel and is easy to generate carburetting, nitrogen pick-up, and conduction time is long more, and carburetting, nitrogen pick-up problem are serious more, and this has greatly limited the application of LF stove in super-purity ferrite stainless steel is smelted.
The present invention adopts Graphite Electrodes centre-drilling hole to blow, conventional LF furnace apparatus aspect be need not big transformation, method is easy to implement flexibly, saves investment, after the transformation this LF stove both routinely the smelting process of LF stove smelt, also can smelt by new mode of the present invention, enable, stop flexible, production process and normal productive process before and after not influencing.Equipment use, easy to maintenance, maintenance cost is cheap.
(LF) compares with common ladle refining furnace, the formed hydrogeneous plasma arc of winding-up coke-oven gas can keep under identical arc length and the current condition, improve arc voltage significantly, and the corresponding arc power that improves significantly, thereby the plasma arc of formation high-energy-density.This is because the enthalpy of hydrogen plasma arc approximately is 16 times of argon plasma electric arc.For example, in argon gas, add 10% coke-oven gas, can make arc voltage increase by 1.8 times.Therefore, can under the prerequisite that does not increase flame current and arc length, on traditional ladle furnace foundation, significantly improve the energy of electric arc, realize superpower and ultra high power ladle refining furnace by the secondary voltage that increases substantially transformer.In this case, can not remain unchanged because electric current does not increase the sectional area of secondary high-current conductor, correspondingly electrode diameter is also constant, and the energy loss absolute magnitude of secondary current supply circuit is constant substantially, and in fact electrical efficiency has improved.And the thermosteresis absolute magnitude of the constant heat transfer that makes electric arc of arc length is constant substantially, and in fact after improving arc energy density, the electric arc heat transfer efficiency increases substantially.Last result is the temperature rise rate that has increased substantially molten steel, has significantly reduced power consumption, consumption of electrode, has improved refining efficiency, has shortened refining cycle, has improved buffering and the regulatory function of ladle furnace between first furnace and continuous casting greatly.
The invention has the beneficial effects as follows:
By forming plasma arc in the electrode lower end, improving molten bath heating efficiency (because enthalpy height of hydrogen plasma arc) at ladle refining furnace Graphite Electrodes hole winding-up coke-oven gas and argon gas mixed gas; Simultaneously, the molten steel recarburization that causes in the LF stove refining process and nitrogen pick-up problem have been solved (because behind the winding-up coke-oven gas, form hydrogeneous plasma arc at electrode tip, when this electric arc exists, on the molten steel surface decarburization and denitrogenation chemical reaction take place), carry out Ultra-low carbon, low nitrogen ferrite stainless steel refining on the LF stove thereby be implemented in, and realized the sequence casting of continuous casting, improved the purpose of the cleanliness factor and the accurate control composition of molten steel; Adopt the purpose of coke-oven gas to be that this gas is the common hydrogen-containing gas of Steel Complex, have the coke-oven gas steam line at most steelshop, gas source is easy, and cheap, implements easily.
Description of drawings
Fig. 1 is the synoptic diagram of existing conventional ladle refining furnace;
Fig. 2 is the structural representation of the ladle refining furnace of one embodiment of the invention;
Nomenclature among the figure,
1 AC power, 2 secondary high-current conductors, 3 electrode jaws
4 hollow graphite electrodes, 5 hydrogeneous plasma arc 6 ladles lids
7 ladles, 8 slags, 9 molten steel
10 spirit pipelines, 11 buggy ladles, 12 bottom blowing porous plugs
13 hydrogen body source (a gases 1; B gas 2; Gas 3)
14 top-blown gas valve station (A reducing valve; The B stopping valve; The C under meter; The D flow control valve;
The E repid cut-off valve)
15 mix gas bag 16 flowrate control valves 17 top-blown gas pipeline and coupling devices
18 material alloying devices
Embodiment
The present invention is further described by the following embodiment, but the present invention is not limited to following embodiment.
Referring to Fig. 2, it is the hydrogeneous plasma three-phase alternating current of a present invention ladle refining furnace structural representation, as shown in the figure, communication power supply 1 connects secondary high-current conductor 2 backs and is connected with electrode jaw 3, hollow graphite electrode 4 is controlled by electrode jaw 3, realize the lifting of hollow graphite electrode 4 and to its conduction, hollow graphite electrode 4 passes ladle lid 6 by the electrode hole of offering on the ladle lid 6 and enters in the ladle 7, the lifting realization by hollow graphite electrode 4 and the contact of slag 8 and molten steel 9 with separate.
Also be provided with material alloying device 18 on the ladle lid 6, splendid attire in the ladle 7 of slag 8 and molten steel 9 and is sitting on the buggy ladle 11, and bottom blowing pipeline 10 is connected with the bottom blowing porous plug 12 that is installed in ladle bottom bottom blown gas is blown in the molten steel 9 in the ladle 7.By gas pipe line with hydrogeneous source of the gas 13, top-blown gas valve station 14, mix gas bag 15 and flowrate control valve 16 is connected in turn, flowrate control valve 16 is connected with hollow graphite electrode 4 by top-blown gas pipeline and connected unit 17 hydrogen-containing gas is blown in the hydrogeneous plasma arc 5 of hollow graphite electrode end formation.
In when work, when the ladle 7 that fills molten steel is sitting on the buggy ladle 11, and mobile buggy ladle is under the heating location ladle.Connect communication power supply 1, decline hollow graphite electrode 4 and slag 8 and molten steel 9 short-circuit arcs, and with the gas of hydrogeneous source of the gas 13 by top-blown gas valve station 14, mix gas bag 15, flowrate control valve 16, top-blown gas pipeline and connected unit 17 rapidly logical people's hollow Graphite Electrodess 4 and enter arc region, thereby produce hydrogeneous plasma arc 5.Can regulate the size of ratio, gas flow and the pressure of each component of mixed gas by the valve station according to arts demand.The length of plasma arc, power (arc voltage, flame current) can be controlled by regulating transformer secondary voltage, gaseous fraction ratio, pressure, flow and rise fall of electrodes.In order to control between furnace atmosphere ladle lid and the ladle, can good seal between electrode hole and the electrode.Other operation, basic identical as steel ladle bottom argon blowing, slag making, alloying etc. with existing LF operation.
When adopting 30t EAF-AOD-LF-CC (electric arc furnace-argon oxygen decarburizing furnace-ladle refining furnace-continuous casting) flow process to produce the 409L ferritic stainless steel, when electric arc furnace smelting finishes, and by after argon oxygen decarburizing furnace (AOD) refining, ladle is hung three-phase alternating current ladle refining furnace LF station, and seat is to buggy ladle, connect the bottom blowing pipeline and open the gas testing of bottom blown gas valve, the gas permeable brick good air permeability, buggy ladle is reached LF stove heating station, fall the ladle lid, make ladle lid and ladle upper edge keep good sealing.Cover the sampling of offering, the sampling of temperature-measuring port thermometric each once (T=1575 ℃) from ladle then, sample send the laboratory analysis of testing.The slag charge that scale is good covers the material alloying device that is provided with from ladle and adds in the stove.The mixed gas that will contain 10% coke-oven gas and 90% argon gas is by 67m
3/ ht steel is passed in the hollow graphite electrode hole, and energising will form hydrogeneous plasma arc at electrode tip so simultaneously, and this electric arc is delivered to heat in the molten bath in the ladle by modes such as radiation, conduction, convection current, and realization is to the heating of slag and molten steel.Behind the energising 8min, promote hollow graphite electrode, outage, close top-blown gas simultaneously, sampling, thermometric (T=1583 ℃) are got the slag specimen observation and have been become white slag.According to molten steel composition result and the steel grades target behind the first time sampling analysis, the good respective alloy of scale also adds it in stove in the molten steel.The argon bottom-blowing flow is adjusted to 226l/min carry out strong mixing 3min, reduce argon flow amount then to 120l/min.Open top-blown gas, the decline hollow graphite electrode, employing is sent electric 12min than low-grade location electric current, voltage, promote hollow graphite electrode, outage, close top-blown gas, sampling, thermometric (T=1612 ℃), turn down the argon bottom-blowing flow and carry out the weak 17min of stirring to 45l/min, sampling, thermometric (T=1596 ℃), composition and temperature are all qualified, stop argon bottom-blowing.Lifting ladle lid is left heating station with buggy ladle, hangs ladle and handles station to next, and refining finishes.
Spray into 10% coke-oven gas+90%Ar mixed gas in hollow electrode, arc power improves 1.8 times, behind the refining 10min, the nitrogen content of molten steel is reduced to below the 95ppm by 150ppm, behind the 20min clock, nitrogen content drops to 42ppm, and carbon content drops to 0.004% by 0.02%.Stopping the heating back by later stage ladle bottom blowing stirring 17min, hydrogen richness can be reduced to below the 3ppm in the molten steel.And when adopting ordinary method to carry out 409L ferrite stainless smelting steel, after the same treatment time, carbon content and nitrogen content increasing amount reach 0.006% and 23ppm respectively in the steel, cause steel grades offscale, can't satisfy 409 finished product composition requirements.
The same technical process of adopting embodiment 1, just the gas ratio with converting process changes the mixed gas that contains 20% coke-oven gas and 80% argon gas into, and gas flow is 78m
3/ ht steel, other operating process are constant substantially.
Spray into 20% coke-oven gas+80%Ar mixed gas in hollow electrode, because the coke-oven gas ratio increases, the air blowing flow increases, arc power improves 2.2 times, behind the refining 9min, the carbon content in the steel is reduced to 0.0079% by 0.02%, and nitrogen content is reduced to 93ppm by 164ppm.Continue air blowing treatment up to the refining terminal point, nitrogen content is the continuation downtrending all the time in air blowing process, handles terminal point to LF, and nitrogen content drops to 35ppm, and carbon content also continues to drop to 0.0025% by 0.0079% in the steel.
The smelting technology flow process of embodiment 3 adopts 30t EAF-AOD-VOD-LF-CC (electric arc furnace-argon oxygen decarburizing furnace-vacuum oxygen gas decarbonization stove-ladle refining furnace-continuous casting) flow process, and producing steel grade is the 409L ferritic stainless steel.The molten steel of electric furnace refining just is after the AOD refining, and tapping is poured ladle into and sent into VOD and carry out refining, and VOD handles terminal point, and carbon content reaches 29ppm in the steel, and nitrogen content is 56ppm.The VOD molten steel after refining is hung in the LF station to be heated with trimming and handles.
In three-phase alternating current ladle refining furnace LF refining process, the operation steps of elementary operation of this heat and embodiment 1 is similar, this heat sprays into the mixed gas of 5% coke-oven gas+95% argon gas from the Graphite Electrodes hole in the refining galvanization, gas flow is controlled at 53m
3/ ht steel, the refining terminal point soft blow argon time is 7min.
In embodiment 3, carbon in the steel after VOD handles, nitrogen content are all lower, are respectively [C]=29ppm, [N]=56ppm.Enter in the LF stove treating processes, arc power increases by 1.1 times, carbon content begins in refining, refining 13min and refining terminal point (22min) are respectively [C]=29ppm, 20ppm and 16ppm, and corresponding nitrogen content constantly is respectively [N]=56ppm, 45ppm and 34ppm.
Claims (2)
1. a ladle refining furnace is handled the method that super-purity ferrite stainless steel is controlled the carbon nitrogen content, and it comprises the steps:
1) during the ferrite stainless smelting steel, furnace such as electric arc furnace, induction furnace or converter tapping originally, and make molten steel composition reach the requirement of super-purity ferrite stainless steel substantially by argon oxygen decarburizing furnace or vacuum-oxygen decarbonizing stove;
2) ladle is transported to the ladle refining station, the beginning ladle refining, in galvanization, Graphite Electrodes centre hole winding-up coke-oven gas and argon gas mixed gas by ladle refining furnace, form hydrogeneous plasma arc in ladle refining furnace electrode lower end, realization guarantees the molten steel cleanliness factor simultaneously to molten steel decarburization, denitrogenation; Wherein, the length of plasma arc, power by regulate transformer secondary voltage (0～380V), coke-oven gas and argon gas blending ratio be 95: 5～5: 95, the pressure range of mixed gas is 0.02～10Mpa, and the flow range of mixed gas is 0.01～50Nm
3/ h and rise fall of electrodes are controlled;
When 3) having a power failure, stop, after molten steel composition, temperature are qualified, ladle is hung ladle refining furnace, send down to go on foot operation and pour into a mould to Graphite Electrodes centre hole blowing gas.
2. ladle refining furnace as claimed in claim 1 is handled the method for super-purity ferrite stainless steel control carbon nitrogen content, it is characterized in that the composition volume percent of described coke-oven gas is: H
250～60%, C
nH
m2～5%, CH
420～30%, CO
21～5%, CO 3～8%, O
20～1.0%, N 2～6%.
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|---|---|---|---|
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|---|---|---|---|
| CNB200610118710XA CN100535153C (en) | 2006-11-24 | 2006-11-24 | Method for processing ultra-pure ferrite stainless steel by using ladle refining furnace to control carbon and nitrogen content |
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Cited By (21)
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| CN102146499A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | Smelting method for making stainless steel by blowing CO2 in argon oxygen decarburization (AOD) |
| CN101768656B (en) * | 2008-12-31 | 2011-08-24 | 宝山钢铁股份有限公司 | Method for refining ultra-low carbon ferritic stainless steel under vacuum |
| CN101845538B (en) * | 2009-03-26 | 2011-11-23 | 宝山钢铁股份有限公司 | Method for controlling vigorous splash during smelting stainless steel in vacuum oxygen decarburization refining furnace |
| CN102560003A (en) * | 2012-01-29 | 2012-07-11 | 北京科技大学 | Method for preventing nitrogen increase of molten steel in LF (Ladle Furnace) refining process by top-blowing argon gas |
| CN102732677A (en) * | 2012-06-05 | 2012-10-17 | 河北钢铁股份有限公司 | Refining method for preventing carbureting of molten steel in LF (ladle furnace) through utilizing argon plasmas |
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