CN102002553A - Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel - Google Patents
Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel Download PDFInfo
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Abstract
The invention relates to a desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel, which comprises the following steps of: (1) deoxidizing after tapping of a rotary furnace, pouring pretreated hot metal into the rotary furnace, smelting, tapping, adding lime, premelted slag and aluminum iron during the tapping process, adding lime, premelted slag and aluminum pills into steel ladles after tapping, blowing argon gas and deoxidizing while strongly agitating; (2) low-frequency desulfurizing at low frequency station, sampling, analyzing that carbon in molten steel is not greater than 0.05%, delivering power, blowing argon gas from bottom, agitating, cutting off power, blowing argon gas while strongly agitating, sampling and analyzing; and (3) relative-humidity decarburizing at relative humidity station, vacuumizing, sampling and analyzing carbon content and aluminum content in molten aluminum, wherein the blowing oxygen content is O<2>(Nm<3>)=molten steel quantity (ton)*0.4+{[C]%+[Al]}*10<3>; circulating in vacuum, sampling after adding aluminum when the carbon content [C] in molten steel is not greater than 0.0020%, and IVRH alloying when the C content in molten steel is not greater than 0.0025%. Sulfur in the medium and low grade cold rolling non-oriented molten silicon steel can be reduced to below 20 ppm.
Description
Technical field
The present invention relates to the sulfur method in the low grade cold rolling non-oriented silicon steel smelting process.
Background technology
Cold rolling non-orientation silicon steel requires S in the finished product≤0.0050%.Sulphur content reduces, iron loss obviously descends, iron loss descends, both can save a large amount of electric energy, can prolong motor and transformer work runtime again, and can simplify refrigerating unit, the electric quantity loss that iron loss caused of annual various countries electrical sheet accounts for the 2.5-4.5% of its annual generated energy, so core loss value is the most important index of examination cold rolling non-orientation silicon steel product magnetic, also on this basis product is carried out the trade mark simultaneously and divides.
The general technology of smelting of cold rolling non-orientation silicon steel is:
The dark desulfurization of hot metal pretreatment----converter smelting--RH decarburization of skimming, deoxidation, alloying, dark desulfurization-continuous casting.
Blast-melted by pre-treatment, to≤0.0030%, but in converter steelmaking process, with the fusing of slag making material, the sulphur content in the molten steel increases with sulphuring treatment in the molten iron, during to tapping in the molten steel sulphur reached 0.0040-0.0060%.Show that the sulphur in the raw and auxiliary materials such as steel scrap, lime causes sulphur content increase in the steel, like this need be in the RH desulfurization.
Bessemerize terminal point C in the steel is controlled to 0.03-0.05%,, be transported to the decarburization of RH vacuum unit, carbon is taken off to the limit again residual oxygen in the steel is removed, then carry out alloying and desulfurization with the form of the rimming steel ladle of tapping.The characteristics of the dark sulfur removal technology of RH vacuum refinement process: the first, before the RH desulfurization, the reply molten steel carries out degree of depth deoxidation, and promptly behind the molten steel aluminum deoxidation, it is a certain amount of that oxygen content in steel is reduced to.Otherwise, what is called " time sulphur " phenomenon might take place, promptly the CaS in the slag can be by hydrogen reduction in the steel ((CaS)+[O]=(CaO)+[S]).Simultaneously, the joining day of sweetening agent should consider that also whether steel grade refining task finish.Add the duration of contact that prolongs sweetening agent and vacuum chamber furnace lining too early, aggravation is to the erosion of vacuum tank bottom and tubular stinger.Therefore, should be chosen in opportunity and carry out after finishing deoxidation and alloying.The second, churning time.Sweetening agent in the alloy chute joins the RH vacuum chamber, with emulsification molten steel mix mutually after downtake flows in the ladle.Desulphurization reaction just carries out in such mixing process, and its mixing effect is strong, sweetening agent is let go rapidly, and has increased mixing of sweetening agent and molten steel.
At present domestic what take all is this technology, after the RH decarburized alloyization, if through the LF desulfurization, can cause molten steel recarburization.If go earlier the LF desulfurization, must carry out deoxidation to molten steel earlier, the molten steel after the deoxidation has increased its difficulty again through the RH decarburization again.
LF carburetting mainly is that Graphite Electrodes causes, LF stove and molten steel surface close together are because the effect of BOTTOM ARGON BLOWING, liquid fluctuating causes electrode directly to contact with molten steel, make molten steel generation carburization reaction, cause molten steel recarburization, and electrode contacts with slag and also can make molten steel produce indirect carburetting.Another kind is exactly that the high temperature of electric arc makes the distillation of leading section graphite, or, thermal stresses peels off because of making it, the gaseous carbon of distillation also is easy to make molten steel recarburization under the ionizing event of electric arc, and the thermal spalling of electrode tip directly makes graphite scrap enter slag and make molten steel recarburization, carbon height can cause the final magnetic property of product to worsen.
If converter tapping promptly goes the desulfurization of LF stove, must carry out deoxidation to molten steel earlier, the basic skills of LF stove deoxidation has bulk deoxidation and diffusive deoxidation, bulk deoxidation be exactly directly in molten steel, add with oxygen affinity than iron and the big element (reductor) of oxygen affinity, make it capture the oxygen that is dissolved in the steel, generation is insoluble to the oxygen of molten steel than thing, and come-up is advanced people's slag, thereby reduces the oxygen level in the steel.Diffusive deoxidation is as the basis with the partition law of oxygen between molten metal and slag.According to this law, when temperature one timing, the partition ratio of oxygen between molten metal and slag is a constant, that is:
L0=(∑ FeO)/[O]=constant (1)
The partition ratio of L0 in the formula---oxygen.
Therefore, as long as the artificial content that reduces (FeO) in the slag will cause oxygen from the diffusion transfer of molten metal to slag, thereby reach the purpose that removes oxygen in the molten metal.
The diffusive deoxidation method relies on reductors such as powdery powdered carbon, ferrosilicon powder, silicon calcium powder or aluminium powder to add in the slag in the production, to the slag reduction, make (FeO) content reduction in the slag, thereby reach the purpose that reduces [O] in the molten steel, and its deoxygenation can be expressed as:
[O]+[Fe]＝(FeO) (2)
y(FeO)+x(M)＝(MxOy)+y[Fe] (3)
Wherein y and x are respectively the equilibrium system of expression reaction, and the advantage of diffusive deoxidation is that because deoxygenation carries out in slag, deoxidation products is difficult for entering in the molten steel, so molten steel is purer.
Sulphur is very sensitive element in the steel, and it is dissolved in the molten steel fully.The sulfur removal technology of LF stove is the white slag doctor treatment, promptly utilizes steel-slag surface reaction and slag system desulfurization, and its reaction mechanism is as follows:
3[S]+2[Al]+3(CaO)＝(Al
2O
3)+3(CaS) (4)
The problem of technology existence at present
(1), starting material are had strict demand, go into the stove steel scrap, slag making auxiliary material sulphur content requires low.
(2), the RH desulfurization, cause the RH tubular stinger life-span to decline to a great extent.
(3), cold rolled silicon steel finished product S is still higher, influences the end properties of cold rolled silicon steel.
Summary of the invention
For overcome existing in the above-mentioned deficiency of sulfur method of low grade cold rolling non-oriented silicon steel molten steel, the invention provides after a kind of desulfurization sulphur content in the molten steel lower in the sulfur method of low grade cold rolling non-oriented silicon steel molten steel.
Above-mentioned (2) and (3) both be or relation, sulphur might be taken off under the situation of disregarding tubular stinger life-span and cost and rhythm of production direct motion.The present invention utilizes before the RH decarburization cold rolling non-orientation silicon steel molten steel is removed sulphur content by LF earlier, can significantly reduce the desulphurization cost of RH, improves the RH tubular stinger life-span and guarantees the product performance of cold rolling non-orientation silicon steel.The present invention changes " deoxidation behind the converter tapping-LF desulfurization-RH decarburization-RH deoxidation alloying-continuous casting " into by existing " RH decarburization-RH deoxidation-RH alloying desulfurization-continuous casting " technology.
The method that this patent utilizes the LF stove to remove sulphur in the cold rolling non-orientation silicon steel molten steel comprises following sequential steps:
Deoxidation behind the I converter tapping
Pour the preprocessed molten iron of weight percent S≤0.0030% into converter, molten iron temperature is not less than 1280 ℃, scratches clean the molten iron slag.
Add molten iron and steel scrap in the converter, pass through converter smelting, make the weight percent C:0.03-0.05% of content in the molten steel, temperature 〉=1680 ℃, converter tapping, molten steel per ton adds lime 2.1kg-2.9kg, pre-melted slag 1.05kg-1.45kg and ferro-aluminum 3.5kg-4.5kg in the tapping process, in ladle, add molten steel lime 3.5kg-4.5kg per ton, pre-melted slag 2.1kg-2.9kg and aluminum shot 1.1kg-1.5kg after the tapping again, argon bottom-blowing then, flow 150-200L/min, strong mixing 3-5min deoxidation, steel water oxygen≤5ppm during departures.
II LF desulfurization
Molten steel is delivered to the LF station, and it is good to detect the top slag fusing of arriving at a station, thermometric liquid steel temperature 〉=1590 ℃, space 300-500mm, carbon in the sampling analysis molten steel≤0.05%;
Send electric 10-15min, the BOTTOM ARGON BLOWING flow control has a power failure then at 10-50L/min in the transmission process, and BOTTOM ARGON BLOWING flow 150-200L/min strong mixing is not less than 15min, and thermometric, sampling analysis and the color of observing slag require the slag color to turn white;
III RH decarburization
Ladle is moved on to the RH station, vacuumize 3min, the vacuum pressure value slowly drops to 12000-20000Pa, in case the molten steel splash, the temperature of measuring molten steel is not less than 1610 ℃, the weight percent of carbon content in the sampling analysis molten steel and aluminium content, determine the decarburization oxygen amount that is blown into, oxygen decarburization.
The decarburization blowing oxygen quantity calculates:
O
2(Nm
3)=molten steel amount (ton) * 0.4+{[C] %+[Al] %} * 10
3(5)
In the oxygen blast process, the control of vacuum pressure value is as the criterion with the not splash of assurance process. be generally 8500-12000Pa.
Decarburization time: guarantee that [C] content is confirmed in circulation 13-15min sampling under vacuum pressure value≤400Pa, the carbon content in the molten steel [C]≤0.0020% o'clock adds aluminium, and molten steel per ton adds 4-5kg.Take a sample after adding aluminium 3min, thermometric is adjusted liquid steel temperature, and the temperature of molten steel is not less than 1585 ℃, and the C content in the molten steel is not more than at 0.0025% o'clock, alloying.
IV RH alloying
The condition of alloying is can add alloy by the composition requirement of this steel grade behind the molten steel aluminum deoxidation, finally makes molten steel composition and temperature satisfy the requirement departures of finished product.
Operation continuous-casting steel pouring is down handed in molten steel departures back.
The sulfur method of low grade cold rolling non-oriented silicon steel molten steel in above-mentioned, decarburization time determines in Step II I RH decarburization, generally be to guarantee that [C] content is confirmed in circulation 15min sampling under vacuum pressure value≤400Pa, when C content is higher than 0.0020%, the C content that prolongs again in the decarburization time 1-2min. molten steel is not more than at 0.0025% o'clock, alloying.
The sulfur method of low grade cold rolling non-oriented silicon steel molten steel is characterized in that: Step II in above-mentioned
The LF desulfurization behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature 〉=1630 ℃, the S in the molten steel≤0.0030% o'clock is left the LF station with ladle and is skimmed, the back residue thickness of skimming is not more than 50mm.
The sulfur method of low grade cold rolling non-oriented silicon steel molten steel in above-mentioned, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature is lower than 1630 ℃, S in the molten steel was greater than 0.0030% o'clock, secondary send electric 12-14min (time considers by actual thermometric value again, 3.5 ℃ of heat-up rates/min) are when liquid steel temperature 〉=1630 ℃, and the weight percent of S [S]≤0.0030% an o'clock ladle is left the LF station and skimmed in the molten steel, and the back residue thickness of skimming is not more than 50mm.
The sulfur method of low grade cold rolling non-oriented silicon steel molten steel in above-mentioned, it is characterized in that: behind step I converter tapping in the tapping process of deoxidation, molten steel per ton adds lime 2.5kg, pre-melted slag 1.25kg and ferro-aluminum 4kg, adds molten steel lime 4kg ± 0.5kg per ton, pre-melted slag 2.5kg and aluminum shot 1.3kg after the tapping again in ladle.
The sulfur method of low grade cold rolling non-oriented silicon steel molten steel in above-mentioned is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, and black as slag specimen cooling back observation, molten steel then per ton adds aluminium powder 0.40-0.50kg residue adjustment.
Sulfur method of low grade cold rolling non-oriented silicon steel molten steel is by the LF desulfurization in this, sulphur can be reduced to 20ppm-12ppm in the finished product molten steel, better and stable than RH sweetening effectiveness (in low trade mark RH desulfurization degree only reach 30%, and LF stove desulfurization degree can reach more than 60%), after sweetening effectiveness improves, can improve the quality of cold rolling non-orientation silicon steel.Improve RH tubular stinger work-ing life, can reduce the desulphurization cost of RH and the sulphur content in the steel greatly, also improved the electromagnetic performance of cold rolling non-orientation silicon steel simultaneously.
Embodiment:
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
What present embodiment was handled is middle trade mark 50TW470 cold rolling non-orientation silicon steel molten steel.80 tons of ladlefuls.
The weight percent of the composition of middle trade mark 50TW470 cold rolling non-orientation silicon steel is:
C≤0.004%; Si 1.50-1.70%; Mn 0.20-0.40%; P≤0.030%; S≤0.005%; Al 0.20-0.40%; All the other are Fe and unavoidable impurities.
Deoxidation behind the I converter tapping
Pour 82 tons and 8 tons steel scraps of preprocessed molten iron of the weight percent S=0.0024% of S content in the molten iron into converter, molten iron temperature is 1285 ℃, scratch clean the molten iron slag. by bessemerizing the weight percent C=0.046% that makes C content in the molten steel, converter tapping when 1690 ℃ of temperature, the weight percent of the composition of molten steel reach following value:
C 0.046%; Si 0.01%; Mn 0.02%; P 0.007%; S 0.0065%; All the other are Fe and unavoidable impurities.
Add lime 200kg, pre-melted slag 100kg, ferro-aluminum 300kg in the tapping process in the ladle; Again to Bao Neijia lime 300kg, pre-melted slag 200kg, aluminum shot 100kg, argon bottom-blowing always flows 200L/min strong mixing 5min after the tapping, oxygen determination content during departures (departures are preceding with the oxygen level in the apparatus for determination of oxygen mensuration molten steel), and the steel water oxygen is 4.2ppm.
II LF desulfurization
Molten steel is hung the LF station, and it is good to detect the top slag fusing of arriving at a station, and surveys 1600 ℃ of liquid steel temperatures, space 450mm, and the weight percent of carbon is C=0.0229% in the sampling analysis molten steel, Al=0.030%, the weight percent of the composition of molten steel is:
C 0.0229%; Si 0.05%; Mn 0.04%; P 0.006%; S 0.0048%; Al 0.030%; All the other are Fe and unavoidable impurities.
Send electric 7min, BOTTOM ARGON BLOWING 40L/min in the transmission process, the argon bottom-blowing that has a power failure then always flows 200L/min strong mixing 15min, thermometric, sampling and the color of observing slag, 1590 ℃ of liquid steel temperatures, the invar water temp is low, does not reach the departures requirement, carries out secondary and send electric 13min, when liquid steel temperature is 1640 ℃, sampling analysis, the weight percent of S [S]=0.0020% in the molten steel, the weight percent of the composition of molten steel is:
C 0.0314%; Si 0.01%; Mn 0.04%; P 0.006%; S 0.0020%; Al 0.020%; All the other are Fe and unavoidable impurities.
Ladle is left the LF station and is skimmed, and residue thickness is 50mm.
III RH decarburization
Ladle is moved on to the RH station, vacuumize 3min, the vacuum pressure value reaches 20000Pa, 1615 ℃ of the temperature of measurement molten steel, and the carbon content in the sampling analysis molten steel (weight percent) is C=0.03%, Al=0.02% determines that by (4) formula stripping carbon oxygen amount is 82Nm
3, take a sample behind the 18min.At this moment, the weight percent C:0.0014% of the composition of molten steel;
Oxygen blast begins to end, progressively reduce the vacuum pressure value and be not less than 8500Pa, is not more than the 12000Pa process and wants strict control splash.
Decarburization finishes, and adds aluminium, and molten steel per ton adds 4.5kg.Take a sample after adding aluminium 3min, thermometric is regulated liquid steel temperature, 1585 ℃ of the temperature of molten steel, C content≤0.0020% in the molten steel o'clock, alloying.The weight percent of the composition of molten steel is at this moment:
C 0.0014%; Si 0.01%; Mn 0.04%; P 0.006%; S 0.0018%; Al 0.34%; All the other are Fe and unavoidable impurities.
IV RH alloying liquid steel temperature adds low-carbon ferrosilicon alloy 1950kg, electrolytic manganese alloy 240kg for 1585 ℃, and after the alloying, the weight percent of the composition of molten steel reaches following value:
C 0.0019%; Si 1.63%; Mn 0.32%; P 0.008%; S 0.0020%; Al 0.32%; All the other are Fe and unavoidable impurities.
Ladle accesses the RH station: commissure foundry work preface is poured into a mould wide 1260 centimetres, thick 220 centimetres strand.The weight percent of the composition of strand is:
C 0.0020%; Si 1.64%; Mn 0.32%; P 0.009%; S 0.002%; Al 0.30%; All the other are Fe and unavoidable impurities.
Embodiment two
What present embodiment was handled is low trade mark 50TW600 cold rolling non-orientation silicon steel molten steel, 80 tons of ladlefuls.
The per-cent of the composition of low trade mark 50TW600 cold rolling non-orientation silicon steel is:
C≤0.005%; Si 1.25-1.50%; Mn 0.2-0.4%; P≤0.020; S≤0.005%; Al 0.20-0.32%; All the other are Fe and unavoidable impurities.
Present embodiment is a following sequential steps:
Deoxidation behind the I converter tapping
Pour the preprocessed molten iron of the weight percent S=0.0022% of S content in the molten iron into converter for 82 tons, molten iron temperature is 1280 ℃, scratch clean the molten iron slag. by bessemerizing the weight percent C=0.03-0.05% that makes C content in the molten steel, temperature 1680-1700 ℃, the converter tapping when weight percent of the composition of molten steel reaches following value:
C 0.03%; Si 0.01%; Mn 0.03%; P 0.011%; S 0.0052%; All the other are Fe and unavoidable impurities.
In the tapping process to Bao Neijia lime 200kg, pre-melted slag 100kg, ferro-aluminum 300kg; Add lime 300kg, pre-melted slag 150kg, aluminum shot 80kg after the tapping again in bag, argon bottom-blowing always flows 200L/min strong mixing 4min, and oxygen level, steel water oxygen=4ppm are measured in departures.
II LF desulfurization
Molten steel is hung the LF station, and it is good to detect the top slag fusing of arriving at a station, and surveys 1620 ℃ of liquid steel temperatures, space 400mm, and the weight percent of carbon is C=0.0211% in the sampling analysis molten steel, Al=0.036%, the weight percent of the composition of molten steel is:
C 0.0211%; Si 0.01%; Mn 0.03%; P 0.012%; S 0.0044%; Al 0.036%; All the other are Fe and unavoidable impurities.
Send electric 12min, send electric BOTTOM ARGON BLOWING 40L/min, strong mixing 15min then has a power failure, argon bottom-blowing flow 200L/min, thermometric, sampling and the color of observing slag, liquid steel temperature reaches 1633 ℃, sampling analysis, the weight percent of S [S]=0.002% in the molten steel, the weight percent of the composition of molten steel is:
C 0.0331%; Si 0.02%; Mn 0.04%; P 0.011%; S 0.002%; Al 0.022%; All the other are Fe and unavoidable impurities.
Ladle is left the LF station and is skimmed, and residue thickness is 40mm.
III RH decarburization
Ladle is moved on to the RH station, vacuumize 4min, vacuum pressure value 20000Pa, 1623 ℃ of the temperature of measurement molten steel, the carbon content in the sampling analysis molten steel (weight percent) is C=0.05%, Al=0.02% determines that by (4) formula stripping carbon oxygen amount is 102Nm
3, oxygen decarburization.
Oxygen blast begins to end, progressively reduce the vacuum pressure value, is not less than 8500Pa (process is wanted strict control splash).[C] content is confirmed in sampling behind the 18min
[C] is 0.0017% in molten steel, adds aluminium, and molten steel per ton adds 4.5kg.Take a sample after adding aluminium 3min, thermometric is adjusted liquid steel temperature, 1585 ℃ of the temperature of molten steel, C content≤0.0020% in the molten steel o'clock, alloying.The weight percent of the composition of molten steel is at this moment:
C 0.0017%; Si 0.01%; Mn 0.01%; P 0.005%; S 0.0015%; Al 0.39%; All the other are Fe and unavoidable impurities.
IV RH alloying
Liquid steel temperature adds low-carbon ferrosilicon alloy 1400kg, electrolytic manganese 450kg alloying for 1585 ℃, and it is even to be circulated to composition, and the weight percent of the composition of molten steel reaches following value, and ladle goes out RH station: C 0.0024%; Si 1.36%; Mn 0.39%; P 0.009%; S 0.0017%; Al 0.341%; All the other are Fe and unavoidable impurities.
Setting off then, it is wide 1260 centimetres to pour into, thick 220 centimetres strand.The weight percent of the composition of strand is:
C 0.003%; Si 1.38%; Mn 0.39%; P 0.009%; S 0.002%; Al 0.32%; All the other are Fe and unavoidable impurities.
Annotate: the tapping in the application in the part refers to that molten steel passes through converter smelting, is poured into the process of ladle by converter.Departures are changed down over to the process of operation by last operation for ladle.
Claims (8)
1. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in a kind, it comprises following sequential steps:
Deoxidation behind the I converter tapping
Pour the preprocessed molten iron of weight percent S≤0.0030% into converter, molten iron temperature is not less than 1280 ℃, scratches clean the molten iron slag;
Add molten iron and steel scrap in the converter, pass through converter smelting, make the weight percent C:0.03-0.05% of content in the molten steel, temperature 〉=1680 ℃, converter tapping, molten steel per ton adds lime 2.1kg-2.9kg, pre-melted slag 1.05kg-1.45kg and ferro-aluminum 3.5kg-4.5kg in the tapping process, in ladle, add molten steel lime 3.5kg-4.5kg per ton, pre-melted slag 2.1kg-2.9kg and aluminum shot 1.1kg-1.5kg after the tapping again, argon bottom-blowing then, flow 150-200L/min, strong mixing 3-5min deoxidation, steel water oxygen≤5ppm during departures;
II LF desulfurization
Molten steel is delivered to the LF station, and it is good to detect the top slag fusing of arriving at a station, thermometric liquid steel temperature 〉=1590 ℃, space 300-500mm, carbon in the sampling analysis molten steel≤0.05%;
Send electric 10-15min, the BOTTOM ARGON BLOWING flow control has a power failure then at 10-50L/min in the transmission process, and BOTTOM ARGON BLOWING flow 150-200L/min strong mixing is not less than 15min, and thermometric, sampling analysis and the color of observing slag require the slag color to turn white;
III RH decarburization
Ladle is moved on to the RH station, vacuumize 3min, the vacuum pressure value slowly drops to 12000-20000Pa, the temperature of measuring molten steel is not less than 1610 ℃, the weight percent of carbon content in the sampling analysis molten steel and aluminium content is determined the decarburization oxygen amount that is blown into, oxygen decarburization;
The decarburization blowing oxygen quantity calculates:
O
2(Nm
3)=molten steel amount (ton) * 0.4+{[C] %+[Al] %} * 10
3
In the oxygen blast process, the control of vacuum pressure value is as the criterion with the not splash of assurance process;
Decarburization time: guarantee that [C] content is confirmed in circulation 13-15min sampling under vacuum pressure value≤400Pa, the carbon content in the molten steel [C]≤0.0020% o'clock adds aluminium, and molten steel per ton adds 4-5kg; Take a sample after adding aluminium 3min, thermometric is adjusted liquid steel temperature, and the temperature of molten steel is not less than 1585 ℃, and the C content in the molten steel is not more than at 0.0025% o'clock, alloying;
IV RH alloying
The condition of alloying is can add alloy by the composition requirement of this steel grade behind the molten steel aluminum deoxidation, finally makes molten steel composition and temperature satisfy the requirement departures of finished product.
2. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 1, it is characterized in that: behind step I converter tapping in the tapping process of deoxidation, molten steel per ton adds lime 2.5kg, pre-melted slag 1.25kg and ferro-aluminum 4kg, adds molten steel lime 4kg ± 0.5kg per ton, pre-melted slag 2.5kg and aluminum shot 1.3kg after the tapping again in ladle.
3. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 1 and 2, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature 〉=1630 ℃, S in the molten steel≤0.0030% o'clock, ladle is left the LF station skim, the back residue thickness of skimming is not more than 50mm.
4. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 1 and 2, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature is lower than 1630 ℃, S in the molten steel was greater than 0.0030% o'clock, secondary send electric 12-14min again, when liquid steel temperature 〉=1630 ℃, the weight percent of S [S]≤0.0030% an o'clock ladle is left the LF station and is skimmed in the molten steel, and the back residue thickness of skimming is not more than 50mm.
5. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 1 and 2, it is characterized in that: decarburization time determines in Step II I RH decarburization, guarantee that [C] content is confirmed in circulation 15min sampling under vacuum pressure value≤400Pa, when C content is higher than 0.0020%, the C content that prolongs again in the decarburization time 1-2min. molten steel is not more than at 0.0025% o'clock, alloying.
6. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 5, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature 〉=1630 ℃, S in the molten steel≤0.0030% o'clock, ladle is left the LF station skim, the back residue thickness of skimming is not more than 50mm.
7. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 5, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, liquid steel temperature is lower than 1630 ℃, S in the molten steel was greater than 0.0030% o'clock, secondary send electric 12-14min again, when liquid steel temperature 〉=1630 ℃, the weight percent of S [S]≤0.0030% an o'clock ladle is left the LF station and is skimmed in the molten steel, and the back residue thickness of skimming is not more than 50mm.
8. the sulfur method of low grade cold rolling non-oriented silicon steel molten steel in according to claim 1 and 2, it is characterized in that: Step II LF desulfurization is behind argon strong mixing, thermometric and sampling analysis, when slag specimen cooling back observation was black, molten steel then per ton added aluminium powder 0.40-0.50kg residue adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010575344A CN102002553B (en) | 2010-12-01 | 2010-12-01 | Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010575344A CN102002553B (en) | 2010-12-01 | 2010-12-01 | Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102002553A true CN102002553A (en) | 2011-04-06 |
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Cited By (10)
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| CN102373315A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | Manufacturing method for high-grade cold-rolled non-oriented silicon steel |
| CN102864274A (en) * | 2012-09-18 | 2013-01-09 | 山西太钢不锈钢股份有限公司 | Method for producing silicon steel with converter |
| CN103276201A (en) * | 2013-05-24 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Cyclic utilizing method of carbon steel LF refining slag |
| CN103468907A (en) * | 2013-09-18 | 2013-12-25 | 济钢集团有限公司 | Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process |
| CN104017929A (en) * | 2014-06-12 | 2014-09-03 | 鞍钢股份有限公司 | Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel |
| CN104313245A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Quick desulfuration method applied in refining heavy rail steel |
| CN104975141A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Temperature-increasing method of molten steel in refining process of non-oriented low-grade aluminum-free silicon steel |
| CN106011384A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Method for smelting non-sedating molten steel |
| CN110438297A (en) * | 2019-08-15 | 2019-11-12 | 北京科技大学 | A method of it producing mild steel and ultra-low-carbon steel molten steel temperature and cleanliness controls |
| CN114672718A (en) * | 2022-04-13 | 2022-06-28 | 张家港扬子江冷轧板有限公司 | Smelting method of high-grade silicon steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373315A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | Manufacturing method for high-grade cold-rolled non-oriented silicon steel |
| CN102864274A (en) * | 2012-09-18 | 2013-01-09 | 山西太钢不锈钢股份有限公司 | Method for producing silicon steel with converter |
| CN102864274B (en) * | 2012-09-18 | 2013-12-25 | 山西太钢不锈钢股份有限公司 | Method for producing silicon steel with converter |
| CN103276201A (en) * | 2013-05-24 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Cyclic utilizing method of carbon steel LF refining slag |
| CN103468907A (en) * | 2013-09-18 | 2013-12-25 | 济钢集团有限公司 | Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process |
| CN104975141A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Temperature-increasing method of molten steel in refining process of non-oriented low-grade aluminum-free silicon steel |
| CN104017929A (en) * | 2014-06-12 | 2014-09-03 | 鞍钢股份有限公司 | Method for increasing percent of pass of carbon-sulphur ingredient of non-oriented silicon steel |
| CN104313245A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Quick desulfuration method applied in refining heavy rail steel |
| CN106011384A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Method for smelting non-sedating molten steel |
| CN110438297A (en) * | 2019-08-15 | 2019-11-12 | 北京科技大学 | A method of it producing mild steel and ultra-low-carbon steel molten steel temperature and cleanliness controls |
| CN114672718A (en) * | 2022-04-13 | 2022-06-28 | 张家港扬子江冷轧板有限公司 | Smelting method of high-grade silicon steel |
| CN114672718B (en) * | 2022-04-13 | 2023-07-07 | 张家港扬子江冷轧板有限公司 | Smelting method of high-grade silicon steel |
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