CN101353750B - Refining method by in situ extraction of inclusion content in melting steel - Google Patents
Refining method by in situ extraction of inclusion content in melting steel Download PDFInfo
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- CN101353750B CN101353750B CN2007100939715A CN200710093971A CN101353750B CN 101353750 B CN101353750 B CN 101353750B CN 2007100939715 A CN2007100939715 A CN 2007100939715A CN 200710093971 A CN200710093971 A CN 200710093971A CN 101353750 B CN101353750 B CN 101353750B
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Abstract
The invention relates to a method for realizing in-situ extraction of impurities in molten steel. According to the method of the invention, argon and alkaline metal powder-fine ore glass compound powder are adopted and dispersed and distributed to the molten steel through bubbles, therefore, the tiny impurities generated during the deoxidation and desulfurization courses of alkaline metal are in-situ captured by a silicate glass solvent; simultaneously, the bubbles and the silicate glass solvent can also effectively capture the impurities during the floating process, thus realizing the goal of in-situ extraction of the impurities in the molten steel. According to the method of the invention, cheap serpentine fine ore is used as the solvent for the refining of the molten steel, thus reducing the production cost; the technique of in-situ extraction of the impurities in molten steel is simple and can highly and effectively remove the impurities in the molten steel.
Description
Technical field
The present invention relates to iron and steel smelting process, particularly, the present invention relates to the method for refining of inclusion in a kind of original position extraction molten steel.
Background technology
Along with science and technology development, the user of metallurgical products constantly proposes to improve the steel performance demands to smelter.Now, utilize the secondary metallurgy technology basically can be in the desired scope of user the chemical Composition Control of steel.But the production of high-quality Clean Steel is a big problem of this area all the time.Because, in the smelting process of steel, to bring some impurity (as manganese, silicon, sulphur, phosphorus, non-metal kind impurity and some gas, as nitrogen, hydrogen, oxygen etc.) etc. inevitably into, these harmful elements and alloying element form various non-metallic inclusions.
For example, steel adds reductor and forms oxide compound, silicate in smelting process, and the steel sulfide, the nitride that in process of setting, form owing to the decline of some element (as sulphur, nitrogen) solubleness, these inclusiones have little time to discharge and stay in the steel, are commonly referred to endogenous inclusion.
For example, manganese.
When manganese exists as impurity in steel, general all less than 0.8%.It is from the pig iron and reductor ferromanganese as steelmaking feed.Manganese has good deoxidizing capacity, can also form MnS with sulphur, to eliminate the deleterious effect of sulphur.These reaction product major parts enter slag and are removed, and small portion residues in becomes non-metallic inclusion in the steel.In addition, at room temperature manganese can be dissolved in ferrite, and steel is had certain strengthening effect.Manganese also can be dissolved in the cementite, forms alloyed cementite.But when manganese existed as small amount of impurities, it was not remarkable to the performance impact of steel.
And for example, silicon.
When silicon existed as impurity in steel, general all less than 0.4%, it was also from the pig iron and reductor.At room temperature silicon can be dissolved in ferrite, and steel is had certain strengthening effect.But when silicon existed as small amount of impurities, it was not remarkable to the performance impact of steel yet.
For another example, sulphur.
Sulphur is to bring impurity in the steel into by the pig iron and fuel.Under solid-state, the solubleness of sulphur in iron is minimum, but is present in the steel with the form of FeS.Because the plasticity of FeS is poor, makes the more steel brittleness of sulfur-bearing bigger.More seriously, FeS and Fe can form the eutectic of low melting point (985 ℃), are distributed on the austenitic crystal boundary.Carry out thermal pressure and add man-hour when steel is heated to about 1200 ℃, the eutectic on the crystal boundary dissolves, and intercrystalline is in conjunction with destroyed, make steel in the course of processing along the crystal boundary cracking, this phenomenon is called red brittleness.In order to eliminate the deleterious effect of sulphur, must increase manganese content in the steel.Manganese and sulphur preferentially form the manganese sulfide of high-melting-point (1620 ℃), and are distributed in intragranular in pelletized form, and it at high temperature has necessarily moulding property, thereby has avoided red brittleness.Sulfide is non-metallic inclusion, can reduce the mechanical property of steel, and forms the hot-work fibrous tissue in the operation of rolling.Therefore, generally, sulphur is deleterious impurity.In steel, want the content of strict restriction sulphur.But the steel that sulphur content is more can form more MnS, and in machining, MnS can play the chip breaking effect, can improve the machinability of steel, and this is the favourable one side of sulphur.
As for phosphorus, phosphorus is brought in the steel by the pig iron, and in the ordinary course of things, the phosphorus in the steel can all be dissolved in the ferrite.Phosphorus has intensive solution strengthening effect, and the intensity, hardness of steel are increased, but plasticity, toughness then significantly reduce.This embrittlement phenomenon is even more serious when low temperature, so be called cold short.Wish that generally Cold Brittleness Transition Temperature is lower than the working temperature of workpiece, to avoid cold short.And phosphorus owing to be easy to generate grain segregation, makes partial area phosphorus content higher in crystallisation process, causes Cold Brittleness Transition Temperature to raise, thereby takes place cold short.Cold short have serious hazardness to the structural part of working under severe cold areas and other cold condition, in addition, the segregation of phosphorus also makes steel form banded structure after hot rolling.Therefore, generally, phosphorus also is deleterious impurity.In steel, also want the content of strict control phosphorus.But phosphorus content more for a long time, because fragility is bigger, then is favourable making the shell steel and improving aspect the machinability of steel.
Except giving birth in above-mentioned the non-metallic inclusion, in steelmaking process, reaction product may enter molten steel in a small amount of slag, refractory materials and the smelting, forms non-metallic inclusion.For example oxide compound, sulfide, silicate, nitride etc.They all can reduce the mechanical property of steel, particularly reduce plasticity, toughness and safe range of stress.When serious, unexpected brittle failure in the time of also can making steel when hot-work and thermal treatment, crack or use.Non-metallic inclusion also impels steel to form hot-work fibrous tissue and banded structure, makes material have anisotropy.When serious, horizontal plastic property only for longitudinally half, and impelling strength is greatly reduced.Therefore, to check quantity, shape, size and the distribution situation of non-metallic inclusion to the steel (as rolling bearing steel, spring steel etc.) of important use.In addition, steel all contacts with air in whole smelting process, thereby always absorbs some gases in the molten steel, as nitrogen, oxygen, hydrogen etc.They also can produce detrimentally affect to the quality of steel.
As the foreign impurity of steel, they are many to be mixed in the solidification of molten steel process in time emersion and to be residued in the steel and form by slag, refractory materials or other impurity.Steel inclusion mainly shows steel flexible harm the steel Effect on Performance, and its hazard rating increases with the intensity of steel and increases.
At present, mainly contain following filtration method, bubble method, flux method, RH vacuum processing method and active metal metamorphism treatment method or the like as the method that is used for removing the molten steel inclusion in the metallurgical industry and (see papers " new development of Production Technology for Clean Steel at Home and Abroad " " Anshan iron and steel plant technology " 2003 such as Pan Xiu orchid, the 5th phase, P1～5).
(1) filtration method
The net type filter claims two dimensional filter again, and common mechanical ground separates bulk inclusion and oxide compound, and mesh size is more little, and purification is put really good more, filters molten iron and adopts molybdenum filament, refractory fibre and BN fiber etc.
The core pattern strainer is made with core usually, but because of its intensity low fragile; External in recent years how forming with the refractory materials sintering is porous flake, general diameter〉100mm, thickness 8～10mm, core pattern strainer have good skimming effect.
Particulate filter has varigrained granulometric composition by loose or agglomerating, and material has coke, and converter slag and Graphite Electrodes are several.
Porous ceramic filter has the three-dimensional netted skeleton structure of connecting through hole, and porosity is big, and density is little, and is heat-resisting.In a word, can carry out pre-filtering to molten steel with net type filter and core pattern strainer; Under the temperature condition of molten steel, the surface of porous ceramic filter is hard slick again, relies on filter cake mechanism to stop inclusion (being mechanical stop); Because the nonwetting property between molten steel and the ceramic surface can cause surface tension, if the aperture of porcelain filter is too little, the capillary resistance hinders steel flow and crosses porcelain filter.Therefore, above-mentioned porcelain filter is difficult to remove the inclusion of the little hundreds of micron of size.
(2) bubble method
Under the ladle argon-blown condition, the removal of solid phase inclusion mainly relies on the flotation effect of bubble in the molten steel, and promptly inclusion and bubble hit and stick on the walls are removed with bubble floating then. the process that inclusion particle is captured by bubble.Can be decomposed into following plurality of processes: (one) inclusion to bubble near and bump; (2) form the molten steel film between inclusion and bubble; (3) inclusion slippage on bubble surface; (4) forming dynamic three contacts and makes liquid film get rid of and break; (5) stabilization and the come-up of inclusion and bubble group.In this plurality of units process, the collision and the adhesion of inclusion particle and bubble play the role of a nucleus.Inclusion content in molten steel compares less, and the bubble floating velocity ratio is very fast, and the inclusion surface has the liquid molten steel of one deck to cover; Under the turbulent flow of molten steel, inclusion waves in molten steel immediately; Limit its capture rate so to a certain extent.
(3) flux method
With NaCl and CaF2 is that the fused salt of main component is handled the inclusion (oxide compound and sulfide) in the molten steel, is to mix after this fused salt mixt drying treatment, it is sprayed in the molten steel of stirring.Because of the density of active fused salt mixt less than molten steel, it in uphill process, rely on liquid steel temperature to melt and with inclusion generation chemical reaction, thereby reach the purpose of removing inclusion.Melt active fused salt and inclusion reaction kinetics problem but this method exists, adhere to the liquid molten steel of one deck on the surface of inclusion, the active fused salt of its obstruction thawing contacts with inclusion.Therefore must tear liquid steel moisture film attached to the inclusion surface, active fused salt can with inclusion generation chemical reaction.Only rely on active fused salt to be difficult to tear the liquid steel moisture film on inclusion surface, the efficient that this method is removed inclusion awaits further perfect.
(4) active metal metamorphism treatment method
The complex deoxidization of alkaline earth element Ba, Mg and Ca and the deoxidation of sweetening agent, desulfurization product very easily float, and the quantity of nonmetallic inclusionsin steel obviously reduces, size reduces, and can change the form of inclusion, make it the come-up and get rid of.When having only active alkaline-earth metal in being dissolved in molten steel to be diffused on the inclusion surface, chemical reaction could take place.Because inclusion is stochastic distribution in molten steel, and the alkaline including earth metal alloy is that the mode by the feeding line joins in the molten steel, cause active alkaline-earth metal skewness in molten steel easily, be difficult to keep alkaline-earth metal like this and be diffused into continuously on the inclusion surface.Therefore the inclusion (oxide compound and sulfide) in molten steel and the active alkaline-earth metal probability that reacts is low.
As mentioned above, existing molten steel refining technology deficiency causes being difficult to realize large-scale industrial production than the molten steel of high cleanliness, is difficult to more realize for zero inclusion molten steel.
For overcoming above-mentioned problem, the objective of the invention is to: according to the organic phase in the hydrometallurgy-water extraction process principle, the method of refining of inclusion in a kind of original position extraction molten steel is provided, the method according to this invention, adopt argon gas and alkaline-earth metal powder-breeze glass composite powder, alkaline-earth metal and breeze glass powder are distributed in the molten steel by the bubble disperse, and thus, the fine foreign matter original position that makes alkaline-earth metal deoxidation and desulfurization produce is caught by silicic acid matter glass flux; Simultaneously, bubble and silicic acid matter glass flux also can carry out catching of effective inclusion in floating-upward process, thereby realize the purpose of inclusion in the original position extraction molten steel.
The method according to this invention adopts the flux of cheap serpentine breeze as liquid steel refining, has reduced production cost; The technology of inclusion is simple in the original position extraction molten steel, can remove inclusion in the molten steel efficiently.
Summary of the invention
For achieving the above object, the method for refining of inclusion comprises following operation in the original position extraction molten steel of the present invention:
(1) in the ratio of 1:0.5-2:2-10, take by weighing metal A l, Mg powder granule and silicic acid matter glass powder respectively, the weight of described metal A l, Mg powder granule and silicic acid matter glass powder is aggregated in 10-20Kg;
(2) with vacuum sphere grinding machine difference ball milling Al, Mg powder granule and silicic acid matter glass powder, described Al, Mg powder granule median size are at the 50-100 order, and described silicic acid matter glass powder particle median size is at 70～200 orders;
(3) drying and dewatering,
(4) powder with above-mentioned two kinds of drying and dewaterings mixes, and it is standby to put into hold-up vessel;
(5) the argon gas molecular sieve drying is pressurized to 5～10Mpa by compressor compresses;
(6) furnace melting 40-60T steel becomes molten steel, changes over to then in the refining furnace;
(7) argon gas with compression sprays into refining to the molten steel with above-mentioned powder, and described refining was carried out 10-20 minute, and slag is separated with molten steel, obtained pure molten steel.
According to aforesaid method of the present invention, with alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder mixing, be injected in the molten steel by steel pipe with argon carrier, above-mentioned alkaline-earth metal powder and silicic acid matter glass composite granule can be divided in the molten steel of preaching more uniformly by argon gas.Rely on liquid steel temperature, above-mentioned alkaline-earth metal powder and silicic acid matter glass composite granule can be melted.
But, because alkaline-earth metal powder fusing point will hang down about 500 ℃ than silicic acid matter glass powder (or flux) melt temperature, the alkaline-earth metal powder of stating alkaline-earth metal powder and silicic acid matter glass composite granule of disperse in molten steel at first begins to melt, and the alkaline-earth metal powder of thawing forms good reductor and sweetening agent.
Like this, the alkaline-earth metal powder of thawing on the one hand with molten steel in the oxygen reaction, on the other hand it with state the alkaline-earth metal powder and react with silicic acid matter glass powder (or flux); The fine foreign matter original position that deoxidation produces sticks on the silicic acid matter glass flux.Simultaneously, the bubble of disperse and silicic acid matter glass flux also can be caught inclusion in the molten steel effectively, thereby reach the effect of inclusion in the original position extraction molten steel.
Preferably, method of refining according to inclusion in the original position extraction molten steel of the present invention, in 1: 1-2: the ratio of 4-10, take by weighing alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder respectively, the weight of described alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder is aggregated in 10-15Kg.
Preferably, according to the method for refining of inclusion in the original position extraction molten steel of the present invention, the consumption of described steel is 40-50T.
Preferably, according to the method for refining of inclusion in the original position extraction molten steel of the present invention, described Al, Mg powder granule median size are at the 50-70 order, and described silicic acid matter glass powder particle median size is at 70～100 orders.
Preferably, according to the method for refining of inclusion in the original position extraction molten steel of the present invention, employed electric furnace is an intermediate frequency furnace.
Preferably, according to the method for refining of inclusion in the original position extraction molten steel of the present invention, described silicic acid matter glass powder is the serpentine breeze.
Preferably, according to the method for refining of inclusion in the original position extraction molten steel of the present invention, wherein the chemical structural formula of serpentine breeze is Mg
6[Si
4O
10] (OH)
8, wherein MgO accounts for 40-45%, SiO
2Account for 40-45%, H
2O accounts for 10-20%.
Preferably, the method for refining according to inclusion in the original position extraction molten steel of the present invention in the ratio of 1:1:4-6, takes by weighing alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder respectively.
The method according to this invention, adopt argon gas and alkaline-earth metal powder-breeze glass composite powder, alkaline-earth metal and breeze glass powder are distributed in the molten steel by the bubble disperse, and thus, the fine foreign matter original position that makes alkaline-earth metal deoxidation and desulfurization produce is caught by silicic acid matter glass flux; Simultaneously, bubble and silicic acid matter glass flux also can carry out catching of effective inclusion in floating-upward process, thereby realize the purpose of inclusion in the original position extraction molten steel.
In addition, the method according to this invention adopts the flux of cheap serpentine breeze as liquid steel refining, has reduced production cost; The technology of inclusion is simple in the original position extraction molten steel, can remove inclusion in the molten steel efficiently.
The simple declaration of accompanying drawing
Fig. 1 is the synoptic diagram of inclusion in alkaline-earth metal powder and silicic acid matter glass powder (or flux) the spraying original position extraction molten steel.
Fig. 2 is the process flow sheet of inclusion in alkaline-earth metal powder and silicic acid matter glass powder (or flux) the spraying original position extraction molten steel.
Figure 3 shows that the equipment of inclusion in the jet original position extraction of alkaline-earth metal-silicic acid matter glass powder (or flux) molten steel.
Among the figure, 1 is the steel drum shell, and 2 is lagging material, 3 is high-temperature refractory, and 4 are circle piped refrigerating unit, and 5 is entrance of cooling water, 6 is cooling water outlet, and 7 is piped sealed liner elastomeric material, and 8 is that gas and powder feed mouth, 9 is the slip-off preventing plate, 13 are refining holding furnace molten steel inlet flange, and 14 is that Link Port 15 is vacuum pump on the sealing cover, and 16 is pipeline, 17 is valve switch, 18 is transport pipe, and 19 is whipping appts, and 20 are the argon gas inlet, 21 is powder, 22 is the powder storage tank, and B is a silicic acid matter glass powder, and G is a molten steel, J is the alkaline-earth metal powder, and Q is a bubble.
Embodiment
Below, for embodiment, specify the present invention.
Embodiment 1
Referring to Fig. 1, Fig. 2 and Fig. 3, with the vacuum sphere grinding machine 1Kg alkaline earth metal aluminide is become powder with 1Kg magnesium ball milling, particle diameter is greatly about 60～100 orders.With the general milling machine silicic acid matter glass powder B ball milling is become powder, glass powder B adopts cheap serpentine breeze 5Kg, and its chemical structural formula is Mg6[Si4O10] (OH) 8, wherein MgO accounts for 40-45%, SiO
2Account for 40-45%, H
2O accounts for 10-20%.Wear into 70～100 purpose powders, and carry out drying and dewatering.
Again alkaline-earth metal ball and serpentine breeze are mixed and put into storage tank 22.Argon gas is sloughed moisture content through siccative, and the argon gas molecular sieve drying is pressurized to 7Mpa by compressor compresses.Argon gas after overdraft is by above-mentioned mixed powder storage tank 22.Pressurized gas is taken away powder, is injected to then among the molten steel G of 1600 50T that spend, and its technology is seen shown in Figure 2.
Fig. 1 is the synoptic diagram of inclusion in alkaline-earth metal powder and silicic acid matter glass powder (or flux) the spraying original position extraction molten steel.As shown in Figure 1, above-mentioned composite granule can divide among the molten steel G that preaches more uniformly by argon gas.Rely on liquid steel temperature above-mentioned composite granule can be melted.Because alkaline-earth metal powder fusing point will hang down about 500 ℃ than silicic acid matter glass powder (or flux) melt temperature, the metal-powder of disperse composite granule in molten steel at first begins to melt.
The alkaline-earth metal powder that melts is good reductor and sweetening agent.The alkaline-earth metal powder that melts so on the one hand with molten steel in the oxygen reaction, it reacts with silicic acid matter glass powder (or flux) on the other hand; The fine foreign matter original position that deoxidation produces sticks on the silicic acid matter glass powder (or flux), and the bubble of disperse and silicic acid matter glass powder (or flux) also can catch inclusion in the molten steel effectively, thereby reaches the effect of inclusion in the original position extraction molten steel.
Patent of the present invention adopts the refining unit of inclusion in alkaline-earth metal powder, silicic acid matter glass powder (or flux) the spraying original position extraction molten steel mainly to be made up of three parts such as refining holding furnace, pumped vacuum systems and air pressure powder spraying systems, specifically sees shown in Figure 3.
As shown in Figure 3, the refining holding furnace is mainly by steel drum shell 1, lagging material 2, high-temperature refractory 3, circle piped refrigerating unit 4, entrance of cooling water 5, cooling water outlet 6, piped sealed liner elastomeric material 7, gas and powder feed mouth 8, slip-off preventing plate 9, seal washer 10, sealing cover 11, screw 12,14 parts such as Link Port 14 are formed on refining holding furnace molten steel inlet flange 13 and the sealing cover.
During use, lagging material 2 is placed on steel drum shell 1 the inside, and high-temperature refractory 3 directly contacts molten steel as liner and is placed in above the lagging material 2.Circle piped refrigerating unit chuck 4 be placed in refining furnace on the upper side portion do not touch molten steel, entrance of cooling water 5 and outlet 6 are placed in respectively on the refrigerating unit 4.Piped sealed liner elastomeric material 7 is placed in round piped refrigerating unit 4 the insides, and slip-off preventing plate 9 can prevent that piped sealed liner elastomeric material 7 from coming off and fall in the molten steel below circle piped refrigerating unit 4.The steel pipe 8 jet and body that dusts is placed in the middle of the piped sealed liner elastomeric material 7, seal washer 10 is placed on above the refining holding furnace molten steel inlet flange 13, sealing cover 11 is placed in above the seal washer 9, with screw 12 sealing cover is fixed on above the refining holding furnace molten steel inlet flange 13.
Pumped vacuum systems is mainly by vacuum pump 15, and pipeline 16 and valve switch 17 3 parts are formed.
During use, valve switch 17 is installed on the pipeline 16, and port of pipeline 16 connects vacuum pump 15 and another port connects Link Port 14 on sealing cover.
The air pressure powder spraying system is mainly by valve switch 17, transport pipe 18, whipping appts 19, argon gas inlet 20, six most of compositions such as powder 21 and powder storage tank 22.
During use, powder 21 is contained in 22 li of powder storages, whipping appts 19 is placed to powder 21 the insides from powder storage tank 22 crown centers, argon gas inlet 20 is placed in powder storage tank 22 tops and takes back, valve switch 17 is laid on the argon gas inlet 20, powder conveying pipeline 18 1 ends are near on the top right side and the other end feeds mouth 8 with gas above the refining holding furnace with powder and is connected, and valve switch 17 is installed in above the powder conveying pipeline 18.
At first the round piped refrigerating unit 4 with refining furnace top carries out water flowing, carries out preheating then, and steel pipe is inserted gas and powder feeding mouth 8, and the other end of steel pipe is connected with powder conveying pipeline 18.
When preheating temperature reaches～during 1300 ℃ of left and right sides, molten steel poured in the refining furnace from refining furnace top 13, cover sealing cover 11 rapidly, then Link Port 14 is connected with pipeline 16 and vacuumizes on the sealing cover.
Be inserted in gas and powder feeding mouthful 8 top steel pipes and begin blowing argon gas, kept 2～5 minutes, start the whipping appts 19 in the air pressure powder spraying system, composite granule will transmit in pipeline by argon gas, feeds steel pipe on mouthfuls 8 very fast speed that compares and is inserted in the molten steel and goes being inserted in gas and powder.Therefore, adopt this novel refining unit can reach the effect of removing inclusion efficiently.
In addition, because behind the steel pipe insertion molten steel, steel pipe can be melted away by molten steel, so steel pipe needs often to change.
Thus, remove inclusion in the molten steel efficiently.
Except with the vacuum sphere grinding machine 2Kg alkaline earth metal aluminide being become powder with 2Kg magnesium ball milling, particle diameter is greatly about 60～80 orders.With the general milling machine silicic acid matter glass powder ball milling is become powder, glass powder adopts cheap serpentine breeze 10Kg, wears into 100～120 purpose powders, and steel is outside the 50T, other technologies such as figure embodiment 1.Inclusion in the original position extraction molten steel.
Except with the vacuum sphere grinding machine 1Kg alkaline earth metal aluminide being become powder with 2Kg magnesium ball milling, particle diameter is greatly about 80-100 orders.With the general milling machine silicic acid matter glass powder ball milling is become powder, glass powder adopts cheap serpentine breeze 8Kg, wears into 120～140 purpose powders, and steel is outside the 45T, and other technologies are as embodiment 1.Inclusion in the original position extraction molten steel.
Except with the vacuum sphere grinding machine 2Kg alkaline earth metal aluminide being become powder with 1Kg magnesium ball milling, particle diameter is greatly about 50-70 orders.With the general milling machine silicic acid matter glass powder ball milling is become powder, glass powder adopts cheap serpentine breeze 8Kg, wears into 90～110 purpose powders, and steel is outside the 40T, and other technologies are as embodiment 1.Inclusion in the original position extraction molten steel.
Embodiment 5
Except with the vacuum sphere grinding machine 3Kg alkaline earth metal aluminide being become powder with 2Kg magnesium ball milling, particle diameter is greatly about 50-70 orders.With the general milling machine silicic acid matter glass powder ball milling is become powder, glass powder adopts cheap serpentine breeze 10Kg, wears into 90～110 purpose powders, and steel is outside the 60T, and other technologies are as embodiment 1.Inclusion in the original position extraction molten steel.
Except the argon gas molecular sieve drying, be pressurized to outside the 9Mpa by compressor compresses, other technologies are as embodiment 1.Inclusion in the original position extraction molten steel.
Except described Al, Mg powder granule median size at the 80-100 order, be pressurized to 10Mpa by compressor compresses, described silicic acid matter glass powder particle median size is at 100～150 orders, steel is outside the 55T, other technologies are as embodiment 2.Inclusion in the original position extraction molten steel.
Technology, effect that table 1 is depicted as inclusion in the surperficial original position extraction molten steel compare.
The technology of inclusion in the table 1 original position extraction molten steel
| Embodiment | Molten steel (T) | Argon pressure (Mpa) | Temperature ℃ | Mg(kg) | Al(kg) | Breeze (kg) | Remove the inclusion effect |
| 1 | 50 | 7 | 1600 | 1 | 1 | 5 | Generally |
| 2 | 46 | 7 | 1600 | 2 | 2 | 8 | |
| 3 | 40 | 7 | 1600 | 1 | 2 | 10 | Good |
| 4 | 45 | 7 | 1600 | 1 | 2 | 8 | Good |
| 5 | 60 | 7 | 1600 | 3 | 2 | 10 | Good |
| 6 | 46 | 9 | 1600 | 2 | 2 | 8 | |
| 7 | 55 | 10 | 1600 | 2 | 2 | 8 | Good |
Make inclusion in the original position extraction molten steel through above-mentioned technology, the size that purifies the inclusion in the molten steel of back is less than 15 μ m, and quantity is considerably less.
The method according to this invention, adopt argon gas and alkaline-earth metal powder-breeze glass composite powder, alkaline-earth metal and breeze glass powder are distributed in the molten steel by the bubble disperse, and thus, the fine foreign matter original position that makes alkaline-earth metal deoxidation and desulfurization produce is caught by silicic acid matter glass flux; Simultaneously, bubble and silicic acid matter glass flux also can carry out catching of effective inclusion in floating-upward process, thereby realize the purpose of inclusion in the original position extraction molten steel.
The method according to this invention adopts the flux of cheap serpentine breeze as liquid steel refining, has reduced production cost; The technology of inclusion is simple in the original position extraction molten steel, can remove inclusion in the molten steel efficiently.
Claims (8)
1. the method for refining of inclusion in the original position extraction molten steel comprises following operation:
(1) in 1: 0.5-2: the ratio of 4-10, take by weighing alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder respectively, the weight of described alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder is aggregated in 5-20Kg;
(2) with vacuum sphere grinding machine difference ball milling alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder, described Al, Mg powder granule median size are at the 50-100 order, and described silicic acid matter glass powder particle median size is at 70～200 orders;
(3) drying and dewatering,
(4) powder with above-mentioned two kinds of drying and dewaterings mixes, and it is standby to put into hold-up vessel;
(5) the argon gas molecular sieve drying is pressurized to 5～10Mpa by compressor compresses;
(6) furnace melting 40-60T steel becomes molten steel, changes over to then in the refining furnace;
(7) argon gas with compression sprays into refining to the molten steel with above-mentioned powder, and described refining was carried out 10-20 minute, and slag is separated with molten steel, obtained pure molten steel.
2. the method for refining of inclusion in the original position extraction molten steel as claimed in claim 1, it is characterized in that, in 1: 1-2: the ratio of 4-10, take by weighing alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder respectively, the weight of described alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder is aggregated in 7-13Kg.
3. the method for refining of inclusion is characterized in that the consumption of described steel is 40-55T in the original position extraction molten steel as claimed in claim 1 or 2.
4. the method for refining of inclusion is characterized in that described alkaline-earth metal Al, Mg powder granule median size are at the 50-70 order in the original position extraction molten steel as claimed in claim 1 or 2, and described silicic acid matter glass powder particle median size is at 70～100 orders.
5. the method for refining of inclusion is characterized in that employed electric furnace is an intermediate frequency furnace in the original position extraction molten steel as claimed in claim 1 or 2.
6. the method for refining of inclusion is characterized in that described silicic acid matter glass powder is the serpentine breeze in the original position extraction molten steel as claimed in claim 1 or 2.
7. the method for refining of inclusion is characterized in that wherein the chemical structural formula of serpentine breeze is Mg in the original position extraction molten steel as claimed in claim 6
6[Si
4O
10] (OH)
8, wherein MgO accounts for 40-45%, SiO
2Account for 40-45%, H
2O accounts for 10-20%.
8. the method for refining of inclusion is characterized in that in 1: 1: the ratio of 4-6 took by weighing alkaline-earth metal Al, Mg powder granule and silicic acid matter glass powder respectively in the original position extraction molten steel as claimed in claim 1 or 2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100939715A CN101353750B (en) | 2007-07-23 | 2007-07-23 | Refining method by in situ extraction of inclusion content in melting steel |
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|---|---|---|---|
| CN2007100939715A CN101353750B (en) | 2007-07-23 | 2007-07-23 | Refining method by in situ extraction of inclusion content in melting steel |
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| CN101353750A CN101353750A (en) | 2009-01-28 |
| CN101353750B true CN101353750B (en) | 2010-11-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| CN1912148A (en) * | 2006-08-01 | 2007-02-14 | 中国兵器工业第五二研究所 | Iron and steel metallurgical compound refining agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| CN1912148A (en) * | 2006-08-01 | 2007-02-14 | 中国兵器工业第五二研究所 | Iron and steel metallurgical compound refining agent |
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| Title |
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| CN 1286312 A,全文. |
| CN 1912148 A,全文. |
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