CN102260822A - High-phosphorus low-sulfur non-oriented electrical steel and smelting method thereof - Google Patents
High-phosphorus low-sulfur non-oriented electrical steel and smelting method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy and particularly relates to high-phosphorus low-sulfur non-oriented electrical steel and a smelting method thereof. The technical problem to be solved is to improve resistivity of the electrical steel without influencing the magnetism of the electrical steel. For solving the problem, the invention adopts a technical scheme which is to provide high-phosphorus low-sulfur non-oriented electrical steel. The high-phosphorus low-sulfur non-oriented electrical steel comprises the following ingredients in percentage by weight: 0 to 0.0050 percent of carbon, 0.30 to 1.0 percent of silicon, 0.15 to 0.35 percent of manganese, 0.030 to 0.08 percent of phosphorus, 0 to 0.005 percent of sulfur, less than or equal to 0.0050 percent of aluminum and the balance of ferrum. A production process for the electrical steel is suitable for producing the high-phosphorus low-sulfur non-oriented electrical steel by taking vanadium titanium-containing molten iron as a raw material, and has a good application prospect.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to high phosphorus low-sulfur non-oriented electrical steel and smelting process thereof.
Background technology
Electrical steel is widely used in transformer, electrical appliance industry, because the electrical steel performance requirement, composition must satisfy low-carbon (LC), low-sulfur, and certain smelting difficulty is arranged.Because phosphorus can improve the resistivity of electrical steel, make the certain phosphorus content application of assurances in the electrical steel more extensive in household electric appliances, but phosphorus content too much can reduce the magnetic of electrical steel again.High-quality electrical steel should both guarantee the raising of resistivity, guaranteed not influence its magnetic again.Therefore in this steel grade smelting process, there are the accurately technological difficulties of control of sulphur, carbon and phosphorus content.
Representative proprietary technology about the electrical steel smelting production method mainly contains:
(1) production method of CN1974820 semi-technological electrical steel (date of declaration: 20070606), a kind of production method of semi-technological electrical steel is disclosed, adopting the CSP plate is the hot rolling raw material, carry out pickling then, cold rolling, annealing, secondary critical strain is cold rolling, behind product eliminates stress, obtain the electrical steel of final magnetic then by the user, the weight chemical ingredients of described CSP plate continuous casting base is C:0.010%～0.020%, Si:0.15%～1.4%, Mn:0.15%～1.20%, P:0.0015%～0.10%, S:0.005%～0.020%, Al:0.15%～0.8%, N:0.0015%～0.0080%, Sb:0.015%～0.12%, Sn:0.015%～0.12%, all the other are iron and unavoidable impurities.This invention does not relate to smelting technology, and the lower control limit of carbon is 0.010%, and phosphorus is controlled to be P:0.0015%～0.10%.
(2) CN1463811, method for production of non-oriented electrical steel (date of declaration: 2005.9.7).This invention provides a kind of twin-roll thin strip continuous casting to make the method for non-oriented electrical steel; The molten steel of silicone content 0～3.5% rotates the crystallization roller, the formation scull through two, derive from the crystallization roller, form the Cast Strip, the Cast Strip enters in-line hot rolling mill, 800～1000 ℃ of temperature of the start rolling temperature of in-line hot rolling mill, hot rolling deformation amount 5%～25% is batched behind hot mill rolling.This invention does not relate to smelting technology, for producing the back operation of strand.
(3) CN03815414, the continuous cast method of non-oriented electrical steel strip (date of declaration: 20050907).This invention relates to the method for the low and non-oriented electrical steel that magnetic permeability is high of preparation iron loss, and in this method, described steel is prepared from by metal melt, and its process comprises: be cast as strip or thin plate, cooling, hot rolling or cold rolling one-tenth steel band finished product.The steel band finished product is further at least once obtained the anneal of magnetic property, thereby make steel band be suitable for technical machinery for example in motor or the transformer.This patent of invention does not relate to smelting technology, and Composition Control is not spelt out the control scheme.
This area need provide a kind of raising that had both guaranteed resistivity at present, guarantees not influence high phosphorus low-sulfur electrical steel of its magnetic and preparation method thereof again.
Summary of the invention
The technical problem to be solved in the present invention is to improve the resistivity of electrical steel, guarantees not influence its magnetic again.
The technical scheme of technical solution problem of the present invention provides a kind of high phosphorus low-sulfur electrical steel.Contain carbon 0～0.0050%, silicon 0.30%～1.0%, manganese 0.15%～0.35%, phosphorus 0.030～0.08%, sulphur 0～0.005%, aluminium 0.010%～0.050% in the composition of this high phosphorus low-sulfur electrical steel, surplus is an iron.
A kind of a kind of method for preparing above-mentioned high phosphorus low-sulfur electrical steel that provides also is provided in the present invention.Promptly contain carbon 0～0.0050%, silicon 0.30%～1.0%, manganese 0.15%～0.35%, phosphorus 0.030～0.08%, sulphur 0～0.005%, aluminium 0.010%～0.050% in the composition of this electrical steel, surplus is an iron.
The method that the present invention prepares above-mentioned electrical steel may further comprise the steps:
A, half steel after the vanadium extraction is added in the common converter smelts;
Adopt single slag process oxygen supply slag making to carry out the dephosphorization decarburization in b, the converter steelmaking process, converter slag-making adopts quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and basicity is controlled at 2.0～3.0;
Converter terminal sulphur≤0.0050%, tapping process add first refining slag and aluminium alloy reductor, and carry out the alloying of silicon, manganese, add properties-correcting agent after having gone out steel on the ladle top of the slag;
C, add second batch of refining slag at the LF refining furnace then and carry out refining, the LF departures add ladle dreg modifying agent in ladle;
D, LF handle and carry out the RH vacuum-treat again, when vacuum tightness is reduced to 11kpa, blows a certain amount of oxygen according to the carbon-to-oxygen ratio example that enters the station in vacuum chamber and carry out vacuum decarburization, to guarantee electrical steel carbon content≤50ppm; Decide oxygen behind the carbonization treatment 10min, and carry out deoxidation, add aluminium kilogram number=(0.2～0.25) * a[O according to oxygen activity adding aluminum shot], described a[O] be oxygen activity, unit is ppm;
After the deoxidation, add manganese metal, low-carbon ferrosilicon and ferrorphosphorus, carry out alloying, after alloy adds 2min, add sweetening agent and aluminum shot in two batches, two crowdes of midfeather 2～3min to the sulphur content of RH station according to molten steel by the steel grades requirement.After treating that second batch of sweetening agent and aluminum shot add, the RH that goes again handles and is not less than 5min, finishes vacuum-treat, adds properties-correcting agent to the ladle top of the slag again, and the soft blow argon is not less than 5min then, the molten steel departures;
Carry out continuous casting after e, the molten steel departures, obtain high phosphorus low-sulfur non-oriented electrical steel.
Wherein, the composition of refining slag described in the above-mentioned method for preparing high phosphorus low-sulfur non-oriented electrical steel by weight content be 65%～85% CaO, the SiO below 5%
2, the Al below 3%
2O
3, 2%～54% Na
2O, 7%～15% CaF
2With the MgO below 6%.
Wherein, the composition of properties-correcting agent described in the aforesaid method contains 35%～45% Al by weight
2O
3With the aluminium (be aluminium 10%～75%, may contain other unavoidable impurities certainly) that is not less than 10%.
Wherein, the component of sweetening agent described in aforesaid method content by weight is 50%～60% CaO, 10%～15% Al
2O
3, 5%～10% SiO
2, 0～5% CaF
2, 0～5% MgO and unavoidable impurities.
Wherein, above-mentioned described in ferrorphosphorus by weight content phosphorous below 29%, 0.5% Si (silicon), the C below 0.5% (carbon) and≤0.005% S (sulphur), all the other are Fe and unavoidable impurities.
Can obtain the high phosphorus low-sulfur electrical steel of sulphur content≤0.008%, carbon content≤0.0050% and phosphorus content 0.03%～0.08% with production method provided by the invention.By to the composition, the low power that adopt the steel billet that method provided by the invention makes, be mingled with etc. and detect as can be known, adopt sulphur content≤0.005%, C≤0.005% and phosphorus content that method provided by the invention makes at 0.03%～0.08% high phosphorus low-sulfur electrical steel, and this steel slab quality is good, and iron loss and magnetic satisfy the following process requirement.
The invention provides a kind of is raw material to contain vanadium-titanium-iron-water, utilize the method for converter-LF-RH-sheet billet continuous casting flow process economic production high phosphorus low-sulfur electrical steel, this method had both guaranteed that composition was qualified, solve the technological difficulties that carbon in producing, sulphur and phosphorus all satisfy the composition requirement, guaranteed steel grade continuous casting production direct motion again.Because the composition of steel all has certain requirement to carbon, sulphur and phosphorus, in smelting process, consider accurate control to molten steel composition, the present invention carries out the RH carbonization treatment in employing in refining process, add phosphorus-containing alloy again, carrying out the RH desulfurization at last handles, make carbon, sulphur and phosphorus content all arrive the control requirement, solved the smelting technology difficult point of this composition, guaranteed carrying out smoothly of continuous casting.This invention is implemented to show and can be produced obvious economic benefit climbing steel vanadium vanadium extraction steelworks experiment.
Description of drawings
Fig. 1 is preparation technology's synoptic diagram of high phosphorus low-sulfur electrical steel of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing in detail by embodiment.
The present invention specifically provides a kind of high phosphorus low-sulfur electrical steel.Contain carbon 0～0.0050%, silicon 0.30%～1.0%, manganese 0.15%～0.35%, phosphorus 0.030～0.08%, sulphur 0～0.005%, aluminium 0.010%～0.050% in the composition of this electrical steel, surplus is an iron.
The method for preparing above-mentioned electrical steel comprises following key step:
A, half steel after the vanadium extraction is added in the common converter smelts;
Adopt single slag process oxygen supply slag making to carry out the dephosphorization decarburization in b, the converter steelmaking process, converter slag-making adopts quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and basicity is controlled at 2.0～3.0;
Converter terminal sulphur≤0.0050%, tapping process add first refining slag and aluminium alloy reductor, and carry out the alloying of silicon, manganese, add properties-correcting agent after having gone out steel on the ladle top of the slag;
C, add second batch of refining slag at the LF refining furnace then and carry out refining, the LF departures add ladle dreg modifying agent in ladle;
D, LF handle and carry out the RH vacuum-treat again, when vacuum tightness is reduced to 11kpa, blows a certain amount of oxygen according to the carbon-to-oxygen ratio example that enters the station in vacuum chamber and carry out vacuum decarburization, to guarantee electrical steel carbon content≤50ppm; Decide oxygen behind the carbonization treatment 10min, and carry out deoxidation, add aluminium kilogram number=(0.2～0.25) * a[O according to oxygen activity adding aluminum shot], described a[O] be oxygen activity, unit is ppm; Here blow a certain amount of oxygen by the carbon-to-oxygen ratio example that enters the station in vacuum chamber, purpose is to have enough oxygen can make carbon in the molten steel and oxygen reaction generate CO, and CO effusion molten steel reaches the purpose of decarburization, to guarantee electrical steel carbon content≤50ppm; Blowing oxygen quantity=1.2*[Δ C] * molten steel amount, [Δ C] carbon content, the % of unit for needing to reduce; Molten steel amount unit is kg; According to the reaction between carbon and oxygen equation, the carbon-to-oxygen ratio example be 1: 1.3 for equilibrium conditions, when the carbon-to-oxygen ratio example greater than this equilibrium conditions, then need oxygen blast, described carbon drop amount is for surpassing the carbon of this proportional part.As be lower than this ratio and then do not need oxygen blast.Generally speaking all be for oxygenation carries out vacuum decarburization, to guarantee electrical steel carbon content≤50ppm;
After the deoxidation, add manganese metal, low-carbon ferrosilicon and ferrorphosphorus, carry out alloying, after alloy adds 2min, add sweetening agent and aluminum shot in two batches, two crowdes of midfeather 2～3min to the sulphur content of RH station according to molten steel by the steel grades requirement.After treating that second batch of sweetening agent and aluminum shot add, capable again RH processing 〉=5min finishes vacuum-treat, adds properties-correcting agent to the ladle top of the slag again, and the soft blow argon is not less than 5min then, the molten steel departures; The soft blow argon is meant from argon blowing hole to ladle in the molten steel of ladle to the bottom and is blown into argon gas, and the control argon flow amount is a low discharge, do not make the surface molten steel occur and seethes, and the argon flow amount of general soft blow argon is controlled to be: 0.6～1.5L/ (mint molten steel)
Carry out continuous casting after e, the molten steel departures, obtain high phosphorus low-sulfur non-oriented electrical steel.
Wherein, the suitable temperature of control; Guarantee RH enter the station rational carbon, a[O] content; RH lift gas flow is selected 1200～1700NL/min; When carbon content was higher, carrying out oxygen decarburization was important condition.
Wherein, described refining slag divides two batches to add in the ladle at least, first refining slag was added in the described ladle in the very first time, the described very first time is added to time period in the described ladle, add-on 3～5Kg/t half steel for the molten steel that obtains from described smelting begins to be added to the described ladle molten steel that obtains to the described smelting of 30% weight; Second batch of refining slag adds add-on 3～5Kg/t half steel in the molten steel that described smelting obtains all is added to the time period that begins to described ladle refining in the described ladle.
Described properties-correcting agent adds three times, and for being added in later on the top of the slag having gone out steel, add-on is 2.0～3.5Kg/t molten steel for the first time; For the LF departures add the ladle top of the slag, add-on is 0.8～1.5kg/t molten steel for the second time; For the RH departures add the ladle top of the slag, add-on is 0.8～1.5kg/t molten steel for the third time.
In the smelting process, the control of carbon content is as follows, and converter terminal control carbon content is 0.3%～0.7%, and molten steel is after the LF refining, and carbon content also is 0.3%～0.7%.The RH carbon content that enters the station is 0.3%～0.7%, carries out the oxygen blast vacuum decarburization according to the carbon-to-oxygen ratio example then, handle 10min after, carbon content is controlled at≤0.0050%.
In the smelting process, sulphur content can be controlled in the following way: the converter tapping sulphur content is controlled at≤and 0.005%, molten steel transports LF to and handles, and can occur sulphur in this process increases by 0～0.002%, LF carries out refining then, after the LF refining end sulphur content is controlled to be≤0.007%.LF handles the back molten steel and transports RH to, adds sweetening agent in vacuum chamber and aluminum shot carries out desulfurization after the RH alloying, after desulfurization sulphur content be controlled at≤0.005%.
The control of phosphorus, previous experiments adopt each operation of LF+RH all to add P iron, but find that P content is difficult to control, the yield instability, and the composition fluctuation is big, causes the P composition to exceed standard easily.Through grope for a long time and with the experiment that cooperates of other conditions, determine in the smelting process at last, phosphorus content can be controlled in the following way: the converter tapping phosphorus content is controlled at 0.010%～0.020%, molten steel transports LF to and carries out refining then, LF does not add ferrorphosphorus, phosphorus content is constant, and molten steel transports RH again to then, and molten steel equates with converter tapping to the RH phosphorus content.Behind the RH aluminum deoxidation, add manganeseirom again and carry out trimming, add ferrorphosphorus by the steel grade requirement at last, the recovery rate of ferrophosphorus is more than 99%.Because the Si content of electrical steel is higher relatively, adds P iron again, thus bigger in RH adding alloy amount, control suitable temperature, could guarantee the direct motion of continuous casting.
There is no particular limitation for described refining slag, can be the conventional various refining slags that use in this area.Under the preferable case, meeting the performance requriements of Pinion Steel in order to make prepared steel billet, is benchmark with the gross weight of described refining slag, and described refining slag can be the CaO that contains 65%-85%, the SiO below 5%
2, the Al below 3%
2O
3, 2%-54% Na
2The CaF of O, 7%-15%
2Refining slag with MgO below 6%.Refining slag can make by the method for routine, for example, can make by quickened lime, fluorite and calcined soda for industry are carried out uniform mixing.Also can directly add in the molten steel in the ratio of smelting process in 80%～85% quickened lime+15%～20% fluorite.
Described properties-correcting agent is mainly used in adjusts Al in the ladle slag
2O
3Content, and can remove oxygen (promptly molten steel being played diffusive deoxidation) in the ladle slag, there is no particular limitation in the present invention, can be the Al of various routines
2O
3The higher raw material of content is with addition of a certain amount of Al (aluminium), yet, in order to reach better modified effect and diffusive deoxidation effect, thereby improving deoxidation efficient and reduce the total oxygen content of the steel billet that makes, described properties-correcting agent preferred component is the Al of 35%～45% weight
2O
3With the Al (aluminium) of 〉=10% weight, can also contain in the described ferro-aluminum the following CaO of 50% weight and≤0.05% P (phosphorus), S (sulphur) or other unavoidable impurities.
Described sweetening agent is mainly used in the desulfurization of RH vacuum, is mainly 50%～60% CaO, 10%～15% Al
2O
3, 5%～10% SiO
2, 0～5% CaF
2, 0～5% MgO and unavoidable impurities.
Can also contain the Al (aluminium) more than 98% in the described aluminium aluminum shot reductor, the Si below 1% (silicon), the C below 0.5% (carbon) and≤0.005% P (phosphorus), S (sulphur) or unavoidable impurities.
Described ferrophosphorus phosphorous below 29%, 0.5% Si (silicon), the C below 0.5% (carbon) and≤0.005% S (sulphur), all the other are Fe and unavoidable impurities.
Described mid-carbon fe-mn for contain the Si (silicon) of manganese below 75%, 0.5%, below 0.5% C (carbon) and≤0.05% P (phosphorus), S (sulphur), all the other are Fe and unavoidable impurities.
Described manganese metal for contain the C (carbon) of manganese below 99%, 0.5%, below 0.5% Si (silicon) and≤0.005% P (phosphorus), S (sulphur), all the other are Fe and unavoidable impurities.
Described low-carbon ferrosilicon be siliceous below 75%, 0.5% C (carbon), the Si below 0.5% (silicon) and≤0.005% P (phosphorus), S (sulphur), all the other are Fe and unavoidable impurities.
In order to guarantee the effect that heats up, LF heating refining process generally needs to the molten steel Argon, but this process Argon can improve desulfurization degree and removal is mingled with, and therefore protects sulphur and intensification in order to control molten steel, needs the control argon blowing rate.LF departures and RH departures all need to carry out the blowing argon gas of low discharge, and purpose is for manganese oxide and iron protoxide in the ladle slag can be reacted with properties-correcting agent, thereby reduces the ratio of two kinds of oxide compounds in slag.
The preparation of embodiment one high phosphorus low-sulfur electrical steel of the present invention
To contain vanadium-titanium-iron-water is raw material, and its main component is: 4.02%C, 0.27%V, 0.17%Mn, 0.003%S, 0.072%P, 0.22%Si, 0.17%Ti and a small amount of unavoidable impurities; This molten iron is blended into the 120t blowing vanadium extracting to be bessemerized, the amount of being blended into is 135t, in converter extracting vanadium, add refrigerant then, and adopt 339 oxygen rifles to carry out oxygen supply and blow vanadium, in blowing 2～3min of vanadium, in stove, add the 2t iron scale, behind the oxygen supply 4.5min, add 300kg magnesia and carry out residue adjustment in stove, oxygen supply was carried out pushing off the slag in 40 seconds and is gone out half steel and vanadium slag again, and the blow end point temperature is 1435 ℃.The half steel composition that obtains is: 3.40%C, 0.07%Mn, 0.062%P, 0.004%S, 0.028%V and unavoidable impurities.The half steel of producing is blended into blow again steel converter blowing of 120t, the amount of being blended into is 135t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, in the oxygen blown while of beginning, carry out steelmaking slagging, in stove, add slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in the oxygen supply 6min, the add-on of slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting is respectively 20Kg/t half steel, 15Kg/t half steel, 15Kg/t half steel and 2.5Kg/t half steel; Oxygen supply time stops oxygen supply and promotes the oxygen rifle in the time of 850 seconds, this moment, bessemer furnace slag basicity was 3.1, and the acquisition temperature is 1680 ℃ a molten steel, the main component of molten steel: 0.032%C, 0.036%Mn, 0.015%P, 0.0045%S, and surplus is Fe.The high magnesium lime that in stove, adds the 3.0Kg/t half steel then, utilize to blow again and stir 2min, carry out the pushing off the slag tapping, the refining slag that in tapping process, in ladle, adds first 3.0kg/t steel, in tapping process, add mid-carbon fe-mn 550kg and middle carbon duriron 2500kg carries out the molten steel alloying, alloy is added by feed bin, has gone out to add properties-correcting agent 2.0Kg/t molten steel behind the steel on the ladle top of the slag.Get the molten steel of alloying, its phosphorus, sulphur, carbon component are 0.015%P, 0.005%S, 0.033%C.
Molten steel is sent to LF again and handles, and molten steel is passed through electrically heated of LF stove and refining.Ladle adds second batch of refining slag during to the LF electrically heated, and add-on is the 3.50kg/t molten steel, heating then, and the treatment time stops heating after being 45min.Add ladle dreg modifying agent 1.0kg/t molten steel to the ladle top of the slag, set off behind the soft blow argon 5min, the LF out-station temperature is 1670 ℃.Molten steel phosphorus, sulphur and carbon component after the processing is 0.015%P, 0.005%S, 0.033%C.
Ladle after the LF processing is delivered to the RH vacuum-treat, and treating processes lift gas flow is 1700NL/min, the molten steel 0.033%C that enters the station, and oxygen activity 0.045% does not carry out oxygen blast.Vacuum tightness is 10min less than the treatment time of 3mbar; After handling 10min, keep vacuum tightness, recording oxygen activity is 0.022%, and molten steel adds aluminum shot 45kg in vacuum chamber then, carries out deoxidation.After adding aluminum shot 2min, add manganese metal 100kg sequentially and ferrophosphorus 30kg carries out alloying.After alloy added 2min, molten steel added first sweetening agent 300kg in vacuum chamber, behind the molten steel circulation 2min, adds second crowd of sweetening agent 300kg and aluminum shot 25kg.Keep vacuum tightness, after RH continues processing 〉=5min, vacuum breaker, the RH processing finishes.The top of the slag adds ladle dreg modifying agent 1kg/t molten steel in ladle, molten steel departures behind the ladle low discharge BOTTOM ARGON BLOWING 6min, and the departures molten steel composition is 0.032%P, 0.004%S, 0.0025%C, 0.73%Si, 0.25%Mn, 0.030%Al, surplus is an iron.
Ladle is sent to continuous casting then.Is 200mm * 1080mm high phosphorus low-sulfur electrical steel strand product with the molten steel in this ladle by adopting continuous casting protection pouring technology technology promptly to obtain section.Continuously cast bloom is rolled into steel band, checks its iron loss P
1.5/50Be 6.7W/kg, magnetic induction density B
5000Be 1.82T, the index that meets the demands.
The preparation of embodiment two high phosphorus low-sulfur electrical steels of the present invention
To contain vanadium-titanium-iron-water is raw material, and its main component is: 4.05%C, 0.28%V, 0.16%Mn, 0.002%S, 0.068%P, 0.21%Si, 0.16%Ti and a small amount of unavoidable impurities; This molten iron is blended into the 120t blowing vanadium extracting to be bessemerized, the amount of being blended into is 135t, in converter extracting vanadium, add refrigerant then, and adopt 339 oxygen rifles to carry out oxygen supply and blow vanadium, in blowing 2～3min of vanadium, in stove, add the 2t iron scale, behind the oxygen supply 4.7min, add 300kg magnesia and carry out residue adjustment in stove, oxygen supply was carried out pushing off the slag in 30 seconds and is gone out half steel and vanadium slag again, and the blow end point temperature is 1433 ℃.The half steel composition that obtains is: 3.38%C, 0.06%Mn, 0.058%P, 0.003%S, 0.027%V and unavoidable impurities.
The half steel of producing is blended into blow again steel converter blowing of 120t, the amount of being blended into is 135t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, in the oxygen blown while of beginning, carry out steelmaking slagging, in stove, add slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in the oxygen supply 6min, the add-on of slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting is respectively 22Kg/t half steel, 16Kg/t half steel, 14Kg/t half steel and 2.3Kg/t half steel; Oxygen supply time stops oxygen supply and promotes the oxygen rifle in the time of 800 seconds, this moment, bessemer furnace slag basicity was 3.0, and the acquisition temperature is 1678 ℃ a molten steel, the main component of molten steel: 0.045%C, 0.033%Mn, 0.012%P, 0.004%S, and surplus is Fe.The high magnesium lime that in stove, adds the 3.0Kg/t half steel then, utilize to blow again and stir 2min, carry out the pushing off the slag tapping, the refining slag that in tapping process, in ladle, adds first 3.0kg/t steel, in tapping process, add mid-carbon fe-mn 580kg and middle carbon duriron 2700kg carries out the molten steel alloying, alloy is added by feed bin, has gone out to add properties-correcting agent 3.0Kg/t molten steel behind the steel on the ladle top of the slag.Get the molten steel of alloying, its phosphorus, sulphur, carbon component are 0.012%P, 0.005%S, 0.046%C.
Molten steel is sent to LF again and handles, and molten steel is passed through electrically heated of LF stove and refining.Ladle adds second batch of refining slag during to the LF electrically heated, and add-on is the 4.0kg/t molten steel, heating then, and the treatment time stops heating after being 41min.Add ladle dreg modifying agent 1.2kg/t molten steel to the ladle top of the slag, set off behind the soft blow argon 5min, the LF out-station temperature is 1675 ℃.Molten steel phosphorus, sulphur and carbon component after the processing is 0.012%P, 0.006%S, 0.046%C.
Ladle after the LF processing is delivered to the RH vacuum-treat, and treating processes lift gas flow is 1700NL/min, the molten steel 0.046%C that enters the station, and oxygen activity 0.037%, when the vacuum chamber pressure is extracted into 11kpa, molten steel oxygen blast 20Nm in vacuum chamber
3Continue then to vacuumize, making vacuum tightness is 10min less than the treatment time of 3mbar; After handling 10min, keep vacuum tightness, recording oxygen activity is 0.025%, and molten steel adds aluminum shot 48kg in vacuum chamber then, carries out deoxidation.After adding aluminum shot 2min, add manganese metal 200kg sequentially, ferrosilicon 200kg and ferrophosphorus 50kg carry out alloying.After alloy added 2min, molten steel added first sweetening agent 350kg in vacuum chamber, behind the molten steel circulation 2min, adds second crowd of sweetening agent 350kg and aluminum shot 28kg.Keep vacuum tightness, after RH continues processing 〉=5min, vacuum breaker, the RH processing finishes.The top of the slag adds ladle dreg modifying agent 1.2kg/t molten steel in ladle, molten steel departures behind the ladle low discharge BOTTOM ARGON BLOWING 6min, and the departures molten steel composition is 0.055%P, 0.004%S, 0.0022%C, 0.68%Si, 0.28%Mn, 0.035%Al, surplus is an iron.
Ladle is sent to continuous casting then.Is 200mm * 1080mm high phosphorus low-sulfur electrical steel strand product with the molten steel in this ladle by adopting continuous casting protection pouring technology technology promptly to obtain section.Continuously cast bloom is rolled into steel band, checks its iron loss P
1.5/50For≤6.9W/kg, magnetic induction density B
5000Be 1.78T, the index that meets the demands.
The preparation of embodiment three high phosphorus low-sulfur electrical steels of the present invention
To contain vanadium-titanium-iron-water is raw material, and its main component is: 4.10%C, 0.27%V, 0.13%Mn, 0.003%S, 0.075%P, 0.20%Si, 0.14%Ti and a small amount of unavoidable impurities; This molten iron is blended into the 120t blowing vanadium extracting to be bessemerized, the amount of being blended into is 135t, in converter extracting vanadium, add refrigerant then, and adopt 339 oxygen rifles to carry out oxygen supply and blow vanadium, in blowing 2～3min of vanadium, in stove, add the 2t iron scale, behind the oxygen supply 4.8min, add 300kg magnesia and carry out residue adjustment in stove, oxygen supply was carried out pushing off the slag in 35 seconds and is gone out half steel and vanadium slag again, and the blow end point temperature is 1428 ℃.The half steel composition that obtains is: 3.41%C, 0.07%Mn, 0.082%P, 0.003%S, 0.026%V and unavoidable impurities.
The half steel of producing is blended into blow again steel converter blowing of 120t, the amount of being blended into is 135t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, in the oxygen blown while of beginning, carry out steelmaking slagging, in stove, add slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and slag making materials is all added opening to blow in the oxygen supply 6min, the add-on of slag making materials quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting is respectively 23Kg/t half steel, 18Kg/t half steel, 16Kg/t half steel and 2.6Kg/t half steel; Oxygen supply time stops oxygen supply and promotes the oxygen rifle in the time of 815 seconds, this moment, bessemer furnace slag basicity was 3.2, and the acquisition temperature is 1682 ℃ a molten steel, the main component of molten steel: 0.055%C, 0.035%Mn, 0.018%P, 0.005%S, and surplus is Fe.The high magnesium lime that in stove, adds the 3.0Kg/t half steel then, utilize to blow again and stir 2min, carry out the pushing off the slag tapping, the refining slag that in tapping process, in ladle, adds first 3.5kg/t steel, in tapping process, add mid-carbon fe-mn 585kg and middle carbon duriron 2600kg carries out the molten steel alloying, alloy is added by feed bin, has gone out to add properties-correcting agent 3.5Kg/t molten steel behind the steel on the ladle top of the slag.Get the molten steel of alloying, its phosphorus, sulphur, carbon component are 0.018%P, 0.005%S, 0.055%C.
Molten steel is sent to LF again and handles, and molten steel is passed through electrically heated of LF stove and refining.Ladle adds second batch of refining slag during to the LF electrically heated, and add-on is the 5.0kg/t molten steel, heating then, and the treatment time stops heating after being 48min.Add ladle dreg modifying agent 1.5kg/t molten steel to the ladle top of the slag, set off behind the soft blow argon 5min, the LF out-station temperature is 1668 ℃.Molten steel phosphorus, sulphur and carbon component after the processing is 0.018%P, 0.005%S, 0.055%C.
Ladle after the LF processing is delivered to the RH vacuum-treat, and treating processes lift gas flow is 1700NL/min, the molten steel 0.055%C that enters the station, and oxygen activity 0.025%, when the vacuum chamber pressure is extracted into 11kpa, molten steel oxygen blast 40Nm in vacuum chamber
3Continue then to vacuumize, making vacuum tightness is 10min less than the treatment time of 3mbar; After handling 10min, keep vacuum tightness, recording oxygen activity is 0.030%, and molten steel adds aluminum shot 60kg in vacuum chamber then, carries out deoxidation.After adding aluminum shot 2min, add manganese metal 180kg sequentially, ferrosilicon 190kg and ferrophosphorus 90kg carry out alloying.After alloy added 2min, molten steel added first sweetening agent 400kg in vacuum chamber, behind the molten steel circulation 2min, adds second crowd of sweetening agent 400kg and aluminum shot 30kg.Keep vacuum tightness, after RH continues processing 〉=5min, vacuum breaker, the RH processing finishes.The top of the slag adds ladle dreg modifying agent 1.5kg/t molten steel in ladle, molten steel departures behind the ladle low discharge BOTTOM ARGON BLOWING 5min, and the departures molten steel composition is 0.068%P, 0.004%S, 0.0018%C, 0.63%Si, 0.28%Mn, 0.035%Al, surplus is an iron.
Ladle is sent to continuous casting then.Is 200mm * 1080mm high phosphorus low-sulfur electrical steel strand product with the molten steel in this ladle by adopting continuous casting protection pouring technology technology promptly to obtain section.Continuously cast bloom is rolled into steel band, checks its iron loss P
1.5/50Be 6.7W/kg, magnetic induction density B
5000Be 1.85T, the index that meets the demands.
Claims (6)
1. high phosphorus low-sulfur non-oriented electrical steel, it is characterized in that: moiety content by weight is carbon≤0.005%, silicon 0.30%～1.0%, manganese 0.15%～0.35%, phosphorus 0.03～0.08%, sulphur≤0.005%, aluminium≤0.005%, and surplus is an iron.
2. prepare the method for the described high phosphorus low-sulfur of claim 1 non-oriented electrical steel, it is characterized in that: may further comprise the steps:
A, half steel after the vanadium extraction is added in the common converter smelts;
Adopt single slag process oxygen supply slag making to carry out the dephosphorization decarburization in b, the converter steelmaking process, converter slag-making adopts quickened lime, composite fluxing medium, high magnesium lime and sludge ball of steel smelting, and basicity is controlled at 2.0～3.0;
Converter terminal sulphur≤0.0050%, tapping process add first refining slag and aluminium alloy reductor, and carry out the alloying of silicon, manganese, add properties-correcting agent after having gone out steel on the ladle top of the slag;
C, add second batch of refining slag at the LF refining furnace then and carry out refining, the LF departures add ladle dreg modifying agent in ladle;
D, LF handle and carry out the RH vacuum-treat again, when vacuum tightness is reduced to 11kpa, blows a certain amount of oxygen according to the carbon-to-oxygen ratio example that enters the station in vacuum chamber and carry out vacuum decarburization, to guarantee electrical steel carbon content≤50ppm; Decide oxygen behind the carbonization treatment 10min, and carry out deoxidation, add aluminium kilogram number=(0.2～0.25) * a[O according to oxygen activity adding aluminum shot], described a[O] be oxygen activity, unit is ppm;
After the deoxidation, add manganese metal, low-carbon ferrosilicon and ferrorphosphorus, carry out alloying, after alloy adds 2min, add sweetening agent and aluminum shot in two batches, two crowdes of midfeather 2～3min to the sulphur content of RH station according to molten steel by the steel grades requirement.After treating that second batch of sweetening agent and aluminum shot add, capable again RH processing 〉=5min finishes vacuum-treat, adds properties-correcting agent to the ladle top of the slag again, and the soft blow argon is not less than 5min then, the molten steel departures;
Carry out continuous casting after e, the molten steel departures, obtain high phosphorus low-sulfur non-oriented electrical steel.
3. the method for high phosphorus low-sulfur non-oriented electrical steel according to claim 2 is characterized in that: the composition of described refining slag is 65%～85% CaO, the SiO below 5% by weight according to quantity
2, the Al below 3%
2O
3, 2%～54% Na
2O, 7%～15% CaF
2With the MgO below 6%.
4. the method for high phosphorus low-sulfur non-oriented electrical steel according to claim 2 is characterized in that: the composition of described properties-correcting agent contains 35%～45% Al by weight
2O
3With the aluminium that is not less than 10%.
5. the method for high phosphorus low-sulfur non-oriented electrical steel according to claim 2 is characterized in that: the component of described sweetening agent content by weight is 50%～60% CaO, 10%～15% Al
2O
3, 5%～10% SiO
2, 0～5% CaF
2, 0～5% MgO and unavoidable impurities.
6. the method for high phosphorus low-sulfur non-oriented electrical steel according to claim 2, it is characterized in that: described ferrorphosphorus is content phosphorous 29% by weight, silicon below 0.5%, the carbon below 0.5% and≤0.005% sulphur, all the other are Fe and unavoidable impurities.
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