CN103397249B - Hypoxemia low-carbon electrical steel and production method thereof - Google Patents
Hypoxemia low-carbon electrical steel and production method thereof Download PDFInfo
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Abstract
The invention provides a kind of hypoxemia low-carbon electrical steel and production method thereof.The composition of described hypoxemia low-carbon electrical steel is by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are iron and trace impurity.The present invention adopts the technical process comprising the operations such as hot metal pretreatment, vanadium extraction by converter blowing, common converter smelting, the refining of LF stove, RH vacuum-treat, sheet billet continuous casting by the high-quality electrical steel of hot metal containing V-Ti production for having mentioned component.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, specifically, relate to a kind of hot metal containing V-Ti that uses and smelt hypoxemia low-carbon electrical steel method.
Background technology
At present, electrical steel is widely used in transformer, electrical appliance industry, and due to electrical steel performance requirement, composition must meet low-carbon (LC), and steel is pure, particularly T [O]≤0.0020%, has certain smelting difficulty.
Representative patent documentation about electrical steel production method comprises following content:
Publication number is the production method that patent document discloses a kind of semi-technological electrical steel of CN1974820A, this production method adopts CSP plate to be hot rolling raw material, then pickling is carried out, cold rolling, annealing, secondary critical strain is cold rolling, then after product eliminates stress, the electrical steel of final magnetic is obtained by user, re-quantization the studying of described CSP plate continuous casting base is divided into 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 inevitable impurity, this production method not cupric in continuously cast bloom, the trace elements such as nickel, while reduction iron loss, production cost is low.
Publication number be CN1463811A patent document discloses a kind of method for production of non-oriented electrical steel, the method comprises: the molten steel of silicone content 0 ~ 3.5%, rotate crystallization roll through two, form scull, derive from crystallization roll, form Cast Strip, Cast Strip enters in-line hot rolling mill, start rolling temperature 800 ~ 1000 DEG C of temperature of in-line hot rolling mill, hot rolling deformation amount 5% ~ 25%, batch after hot mill rolling, production technique of the present invention is simple and can effectively produce high performance non-oriented electrical steel.
Publication number is the continuous cast method that patent document discloses a kind of non-oriented electrical steel strip of CN1665943A, and in the method, described steel is prepared from by metal melt, and its process comprises: be cast as strip or thin plate, cooling, hot rolling and/or cold rolling one-tenth finished steel sheet.Finished steel sheet is obtained further at least one times to the anneal of magnetic property, thus steel band of the present invention is suitable in technical machinery such as motor or transformer.
Summary of the invention
A kind of hot metal containing V-Ti that uses is the object of the present invention is to provide to smelt hypoxemia (such as, T [O]≤0.002%) low-carbon (LC) (such as, C≤0.005%) electrical steel method.
An aspect of of the present present invention provides a kind of hypoxemia low-carbon electrical steel, and the composition of described hypoxemia low-carbon electrical steel is by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are iron and trace impurity.
Another aspect provides a kind of smelting hypoxemia low-carbon electrical steel method, described method comprises the step that next coming in order carry out: to composition be the C of 3.5 ~ 4.5wt%, S, the Si of 0.1 ~ 0.3wt% of the P of the Mn of the V of 0.25 ~ 0.35wt%, 0.1 ~ 0.3wt%, 0.05 ~ 0.12wt%, 0.05 ~ 0.12wt%, the Fe of the Ti of 0.1 ~ 0.3wt% and surplus and the hot metal containing V-Ti of inevitable impurity carry out vanadium extraction by converter blowing, enters vanadium slag and P≤0.040wt%, S≤0.005wt% in half steel molten steel to make the v element of more than 85wt% in hot metal containing V-Ti, desulfurization is carried out to half steel molten steel, to make S≤0.002wt% wherein, half steel molten steel is added converter, and in converter, add the slag making materials be made up of the sludge ball of steel smelting of the quartz sand of the quickened lime of 15 ~ 20kg/t half steel, 10 ~ 15Kg/t half steel, the high magnesium lime of 10 ~ 15Kg/t half steel and 2 ~ 3Kg/t half steel, and oxygen supply intensity is controlled to be 3 ~ 6Nm
3/ (mint steel), be that 1.5 ~ 2.5m bessemerizes by control of lance position, and converting process temperature is controlled to be 1550 ~ 1680 DEG C, slag-stopping tapping is to ladle, and in molten steel, the quickened lime of 3 ~ 8Kg/t half steel and the fluorite of 0.5 ~ 2Kg/t half steel is added in the process of tapping, in ladle, add the mid-carbon fe-mn 3 ~ 4kg/t steel required for molten steel target component simultaneously, after having tapped, add containing aluminium slag supplying agent 2 ~ 6kg/t steel to the ladle top of the slag, described containing the Al of aluminium slag supplying agent composition by 35 ~ 45wt%
2o
3, the CaO of 35 ~ 45wt% and>=10wt% Al composition, carry out LF refining, to be controlled to be 1620 ~ 1640 DEG C by liquid steel temperature, molten steel enters RH vacuum-treat station, and first carry out first time thermometric and determine oxygen, when carbon content is greater than oxygen activity, determine that blowing oxygen quantity carries out oxygen decarburization, the not oxygen blast when carbon content is not more than oxygen activity according to formula 1, described formula 1 is: blowing oxygen quantity (Nm
3)=(1.0 ~ 1.5) × [C] × W, wherein, and the difference that [C] is carbon content and oxygen activity, W is molten steel amount, and unit is Kg, then, under not higher than the vacuum tightness of 100Pa, vacuum-treat is carried out to molten steel, and in vacuum process, carry out second time thermometric determine oxygen, and in molten steel, add aluminium according to formula 2 and carry out deoxidation, alloying is carried out according to the requirement of Si and Mn in target molten steel composition after deoxidation, wherein, vacuum processing time before second time thermometric determines oxygen controls to be that 15 ~ 25min(suggestion expands to value range), vacuum processing time after alloying controls to be that 7 ~ 12min(suggestion expands to value range), described formula 2 is aluminum shot add-on (Kg)=0.2 ~ 0.6) a [O] W/210, wherein, a [O] is molten steel oxygen activity, unit ppm, W is molten steel amount in ladle, unit is ton, after RH vacuum-treat completes, in molten steel, add 0.5 ~ 1.5Kg/t steel containing aluminium slag supplying agent, and carry out BOTTOM ARGON BLOWING to ladle, BOTTOM ARGON BLOWING flow is 150 ~ 200NL/min, and BOTTOM ARGON BLOWING time controling is for being not less than 6min, sheet billet continuous casting, obtains the electrical steel of mentioned component.
Compared with prior art, method of the present invention adopts hot metal containing V-Ti to obtain composition to be by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are the high-quality electrical steel of iron and trace impurity.
Accompanying drawing explanation
Fig. 1 shows the process flow diagram of an exemplary embodiment according to hypoxemia low-carbon electrical steel production method of the present invention.
Embodiment
Hereinafter, hypoxemia low-carbon electrical steel of the present invention and production method thereof is described with reference to the accompanying drawings in detail.
Fig. 1 shows the process flow diagram of an exemplary embodiment according to hypoxemia low-carbon electrical steel production method of the present invention.
As shown in Figure 1, hypoxemia low-carbon electrical steel production method of the present invention adopts the technical process comprising the operations such as hot metal pretreatment, vanadium extraction by converter blowing, common converter smelting, the refining of LF stove, RH vacuum-treat, sheet billet continuous casting to produce hot metal containing V-Ti for hypoxemia low-carbon electrical steel.The composition of this hypoxemia low-carbon electrical steel is by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are iron and trace impurity.
In one exemplary embodiment of the present invention, smelt hypoxemia low-carbon electrical steel method and comprise the step that next coming in order carry out: to composition be the C of 3.5 ~ 4.5wt%, S, the Si of 0.1 ~ 0.3wt% of the P of the Mn of the V of 0.25 ~ 0.35wt%, 0.1 ~ 0.3wt%, 0.05 ~ 0.12wt%, 0.05 ~ 0.12wt%, the Fe of the Ti of 0.1 ~ 0.3wt% and surplus and the hot metal containing V-Ti of inevitable impurity carry out vanadium extraction by converter blowing, enters vanadium slag and P≤0.040wt%, S≤0.005wt% in half steel molten steel to make the v element of more than 85wt% in hot metal containing V-Ti, desulfurization is carried out to half steel molten steel, to make S≤0.002wt% wherein, half steel molten steel is added converter, and in converter, add the slag making materials be made up of the sludge ball of steel smelting of the quartz sand of the quickened lime of 15 ~ 20kg/t half steel, 10 ~ 15Kg/t half steel, the high magnesium lime of 10 ~ 15Kg/t half steel and 2 ~ 3Kg/t half steel, and oxygen supply intensity is controlled to be 3 ~ 6Nm
3/ (mint steel), be that 1.5 ~ 2.5m bessemerizes by control of lance position, and converting process temperature is controlled to be 1.5 ~ 2.5m, slag-stopping tapping is to ladle, and in molten steel, the quickened lime of 3 ~ 8Kg/t half steel and the fluorite of 0.5 ~ 2Kg/t half steel is added in the process of tapping, in ladle, add the mid-carbon fe-mn 3 ~ 4kg/t steel required for molten steel target component simultaneously, after having tapped, add containing aluminium slag supplying agent 2 ~ 6kg/t steel to the ladle top of the slag, described containing the Al of aluminium slag supplying agent composition by 35 ~ 45wt%
2o
3, the CaO of 35 ~ 45wt% and>=10wt% Al composition, carry out LF refining, to be controlled to be 1620 ~ 1640 DEG C by liquid steel temperature, molten steel enters RH vacuum-treat station, and first carry out first time thermometric and determine oxygen, when carbon content is greater than oxygen activity, determine that blowing oxygen quantity carries out oxygen decarburization, the not oxygen blast when carbon content is not more than oxygen activity according to formula 1, described formula 1 is: blowing oxygen quantity (Nm
3)=(1.0 ~ 1.5) × [C] × W, wherein, and the difference that [C] is carbon content and oxygen activity, W is molten steel amount, and unit is Kg, then, under not higher than the vacuum tightness of 100Pa, vacuum-treat is carried out to molten steel, and in vacuum process, carry out second time thermometric determine oxygen, and in molten steel, add aluminium according to formula 2 and carry out deoxidation, alloying is carried out according to the requirement of Si and Mn in target molten steel composition after deoxidation, wherein, it is 15 ~ 25min that vacuum processing time before second time thermometric determines oxygen controls, it is 7 ~ 12min that vacuum processing time after alloying controls, described formula 2 is aluminum shot add-on (Kg)=(0.2 ~ 0.6) a [O] W/210, wherein, a [O] is molten steel oxygen activity, unit ppm, W is molten steel amount in ladle, unit is ton, after RH vacuum-treat completes, in molten steel, add 0.5 ~ 1.5Kg/t steel containing aluminium slag supplying agent, and carry out BOTTOM ARGON BLOWING to ladle, BOTTOM ARGON BLOWING flow is 150 ~ 200NL/min, and BOTTOM ARGON BLOWING time controling is for being less than 6min, sheet billet continuous casting, obtains the electrical steel of mentioned component.
In another exemplary embodiment of the present invention, smelt hypoxemia low-carbon electrical steel method also by carrying out with under type.
First, dark vanadium extraction is carried out to hot metal containing V-Ti, then carry out desulfurization, make desulfurized molten iron sulphur content≤0.002%.Wherein, vanadium extraction is carried out to hot metal containing V-Ti and adopts oxygen top-bottom blowing vanadium extracting, specifically, in vanadium extracting process, employing sulphur content carries out vanadium extraction lower than the vanadium desulphurised hot metal that contains of 0.005% in converter extracting vanadium, so that effective extraction of more than 85% vanadium resource can be ensured, obtain the half steel of [P]≤0.040%, [S]≤0.005%.Composite blowing sulfur method or the desulfurization of KR method can be adopted in the dark desulphurization technological process of hot metal containing V-Ti.When adopting composite blowing sulfur method, composite blowing time 30 ~ 40min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0 ~ 6.0kg/t
molten iron; Deactivating magnesium powder consumption is 1.2 ~ 1.5kg/t
molten iron; When adopting KR method desulfurization, churning time 40 ~ 50min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 4.0 ~ 6.0kg/t
molten iron; Deactivating magnesium powder consumption is 1.2 ~ 1.5kg/t
molten iron.
Converter steelmaking process adopts single slag to carry out dephosphorization, and wherein slag making materials and add-on thereof are: the add-on of quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 15 ~ 20kg/t half steel, 10 ~ 15Kg/t half steel, 10 ~ 15Kg/t half steel and 2 ~ 3Kg/t half steel.In converter steelmaking process, control of lance position is: control of lance position is between 1.5 ~ 2.5m, and adopt larger quantity of slag slag dephosphorization, converting process temperature controls at 1550 ~ 1680 DEG C.
Then, the molten steel obtained by converter smelting is added in ladle, in tapping process, adopt quickened lime and fluorite to carry out wash heat, in ladle, add the mid-carbon fe-mn 3 ~ 4kg/t steel required for molten steel target component simultaneously, after having tapped, add at the ladle top of the slag and carry out modification containing aluminium slag supplying agent 2 ~ 6kg/t steel to steel cinder inclusion; Modified molten steel is sent to LF and heats, and ensures that molten steel carries out the temperature required for vacuum-treat; LF processes rear molten steel and is sent to RH vacuum-treat, RH vacuum process is the most important link that this steel grade is smelted, molten steel enters RH process station, first carry out thermometric and determine oxygen, according to carbon oxygen relation determination molten steel the need of carrying out oxygen blast process, as carbon content is greater than oxygen activity, then need oxygen decarburization, the oxygen blast formula of employing is:
Blowing oxygen quantity (Nm
3)=(1.0 ~ 1.5) × [C] × W(kg),
Preferably, blowing oxygen quantity (Nm
3)=(1.2 ~ 1.4) × [C] × W(kg),
Wherein, the carbon content of [C]-needs reduction; W-molten steel amount, kg.
After oxygen blast completes, within quick reduction vacuum tightness to 100Pa (such as, within vacuum tightness being reduced to 100Pa in 3min), then under the condition of 100 vacuum tightnesss, molten steel 15 ~ 25min is processed, now sampling analysis carbon content is≤0.002%, then carries out thermometric and determine oxygen, and adds aluminum shot according to oxygen activity and carry out deoxidation, deoxidation adopts aluminum shot, and add-on formula is:
Aluminum shot add-on (Kg)=(0.2 ~ 0.6) a [O] W/210,
Preferably, aluminum shot add-on (Kg)=(0.4 ~ 0.5) a [O] W/210,
Wherein, a [O]-molten steel oxygen activity, ppm; Molten steel amount in W-ladle, ton.
After deoxidation, more according to target composition adds low-carbon ferrosilicon, manganese metal, aluminum shot successively, and after alloy has added, then after continuing process 7 ~ 12min, broken empty, continuous casting is sent in the departures of RH molten steel.In described RH treating processes, before lift gas flow adopts, 3min is that 1600 ~ 1800NL/min, 3-18min adopt 2000 ~ 2500NL/min, 18min-process to terminate employing 1800 ~ 2000NL/min.After RH process completes, add containing aluminium slag supplying agent 100 ~ 200kg in ladle, and ensure argon blowing time >=6min in the scope that steel ladle bottom argon blowing flow is 150 ~ 200NL/min, after argon blowing time arrives, molten steel is sent to continuous casting and pours into a mould.
Casting process need add covering agent in 400 ~ 600kg low-carbon (LC) opening to water in forward direction tundish; cast is started when molten steel reaches more than 45t; crystallizer protecting residue adopts low carbon protective slag; casting process pulling rate adopts 0.9 ~ 1.2m/min; adopt this technique; can produce section is smoothly (210 ~ 230mm) × (1080 ~ 1900mm) sheet billet continuous casting base, to its T of continuously cast bloom sampling analysis [O]≤0.002%, and the high-level electrical steel of carbon content≤0.005%.
Carry out detection by composition, the low power to the steel billet adopting method provided by the invention to obtain, be mingled with etc. known, the present invention obtains the composition of electrical steel for be by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are iron and trace impurity.
Can containing the Al(aluminium of more than 98% in aluminum shot reductor), the Si(silicon of less than 1%), the C(carbon of less than 0.5%) and≤0.005% P(phosphorus), S(sulphur) or inevitable impurity.
Mid-carbon fe-mn is for containing the Si(silicon of manganese less than 75%, 0.5%), the C(carbon of less than 0.5%) and≤0.05% P(phosphorus), S(sulphur), all the other be Fe and inevitable impurity.
Manganese metal is for containing the C(carbon of manganese less than 99%, 0.5%), the Si(silicon of less than 0.5%) and≤0.005% P(phosphorus), S(sulphur), all the other be Fe and inevitable impurity.
Low-carbon ferrosilicon is siliceous 75%, the C(carbon of less than 0.5%), the Si(silicon of less than 0.5%) and≤0.005% P(phosphorus), S(sulphur), all the other are Fe and inevitable impurity.
Containing the Al of aluminium slag supplying agent composition by 35 ~ 45wt%
2o
3, the CaO of 35 ~ 45wt% and>=10wt% Al composition.
Example 1
Take hot metal containing V-Ti as raw material, its main component is: 4.02%C, 0.27%V, 0.17%Mn, 0.070%S, 0.072%P, 0.22%Si, 0.17%Ti and a small amount of inevitably impurity; This molten iron is blended into 210t blowing vanadium extracting bessemerize, the amount of being blended into is 238t, then in converter extracting vanadium, refrigerant is added, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in the 3min blowing vanadium, in stove, add 2t iron scale, after oxygen supply 4.5min, in stove, add 300kg magnesia carry out residue adjustment, then oxygen supply is carried out pushing off the slag for 40 seconds and gone out half steel and vanadium slag, blow end point temperature is 1435 DEG C.Half composition of steel obtained is: 3.40%C, 0.07%Mn, 0.062%P, 0.068%S, 0.028%V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carries out desulfurization, adopt composite blowing or the desulfurization of KR method.Adopt composite blowing sulfur method, 38min during composite blowing; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.5kg/t
molten iron; Deactivating magnesium powder consumption is 1.35kg/t
molten iron.Half composition of steel obtained after desulfurization is: 3.35%C, 0.05%Mn, 0.061%P, 0.002%S, 0.027%V, and surplus is Fe and inevitable impurity.
Half steel after desulfurization is blended into 210t blow again steel converter blowing, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting oxygen blown while, carry out steelmaking slagging, slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is added in stove, and slag making materials is all added opening to blow in oxygen supply 6min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 18Kg/t half steel, 11Kg/t half steel, 13.5Kg/t half steel and 2.2Kg/t half steel; During oxygen supply time 870 seconds, oxygen feeding stop promotes oxygen rifle, now bessemer furnace slag basicity is 3.1, obtains the molten steel that temperature is 1688 DEG C, the main component of molten steel: 0.037%C, 0.05%Mn, 0.008%P, 0.0025%S, the a [O] of 0.085%, surplus is Fe and inevitable impurity.Then slag-stopping tapping is carried out, in ladle, the fluorite of quickened lime 3.0kg/t steel and 0.5Kg/t half steel is added in tapping process, in tapping process, add mid-carbon fe-mn 3.2kg/t steel, alloy is added by feed bin, adds slag supplying agent 3.0Kg/t molten steel after having gone out steel on the ladle top of the slag.Obtain 215 tons, the molten steel of alloying, temperature is 1598 DEG C, and its composition is 0.008%P, 0.0035%S, 0.033%C, 0.05%Mn, 0.082%a [O], and surplus is Fe and inevitable impurity.
Molten steel is sent to LF process again, by molten steel by the electrically heated of LF stove and refining.When ladle is to LF electrically heated, the treatment time is after 25min, stops heating.Set off after soft blow argon 5min, LF out-station temperature is 1630 DEG C.Molten steel composition after process is 0.010%P, 0.0035%S, 0.22%Mn, 0.033%C, 0.084%a [O], and surplus is Fe and inevitable impurity.
Ladle after LF process is delivered to RH vacuum-treat, and now temperature is 1620 DEG C, and carbon content is 0.034%, a [O] is 0.085%, does not need oxygen blast.Start to vacuumize, lift gas flow is 1600NL/min.Within 3min final vacuum degree is reduced to 300Pa, lift gas flow is adjusted to 2500NL/min, the treatment time that vacuum tightness is less than 3mbar is 12min; After process 12min, keep vacuum tightness, recording oxygen activity is 0.021%, then adds aluminum shot 0.4kg/ to molten steel in vacuum chamber
t steel, carry out deoxidation.After adding aluminum shot 2min, add manganese metal 0.5kg/ sequentially
t steel, low-carbon ferrosilicon 12Kg/
t steel, Al ball 3.2Kg/
t steelcarry out alloying.After alloy adds, adjustment lift gas flow is to 1800NL/min, and after continuing process 7min, vacuum breaker, RH process terminates.In ladle, the top of the slag adds slag supplying agent 1kg/t molten steel, and after ladle adopts the argon flow amount BOTTOM ARGON BLOWING 6min of 30NL/min, molten steel sets off, and departures molten steel composition is 0.010%P, 0.004%S, 0.0042%C, and surplus is Fe and inevitable impurity.Then ladle is sent to continuous casting.Namely molten steel in this ladle is obtained section by employing continuous casting protection pouring Technology is 200mm × 1080mm hypoxemia low-carbon electrical steel strand product.
Casting process need add covering agent in 500kg low-carbon (LC) opening to water in forward direction tundish, and crystallizer protecting residue adopts low carbon protective slag, and casting process pulling rate adopts 1.1m/min to control.To its T of continuously cast bloom sampling analysis [O] produced be 0.0020%, carbon content 0.0050%, silicon 0.80%, manganese 0.20%, phosphorus 0.010%, sulphur 0.004%, surplus be iron and trace impurity.
Example 2
Take hot metal containing V-Ti as raw material, its main component is: 4.2%C, 0.28%V, 0.16%Mn, 0.072%S, 0.088%P, 0.17%Si, 0.16%Ti and a small amount of inevitably impurity; This molten iron is blended into 210t blowing vanadium extracting bessemerize, the amount of being blended into is 238t, then in converter extracting vanadium, refrigerant is added, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in the 3min blowing vanadium, in stove, add 2.5t iron scale, after oxygen supply 4.8min, in stove, add 280kg magnesia carry out residue adjustment, then oxygen supply is carried out pushing off the slag for 50 seconds and gone out half steel and vanadium slag, blow end point temperature is 1442 DEG C.Half composition of steel obtained is: 3.70%C, 0.06%Mn, 0.084%P, 0.072%S, 0.026%V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carries out desulfurization, adopt composite blowing or the desulfurization of KR method.Adopt the desulfurization of KR method, churning time is 42min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.8kg/t
molten iron; Deactivating magnesium powder consumption is 1.42kg/t
molten iron.Half composition of steel obtained after desulfurization is: 3.7%C, 0.04%Mn, 0.085%P, 0.001%S, 0.022%V and inevitably impurity.
Half steel after desulfurization is blended into 210t blow again steel converter blowing, the amount of being blended into is 235t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting oxygen blown while, carry out steelmaking slagging, slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is added in stove, and slag making materials is all added opening to blow in oxygen supply 7min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 19Kg/t half steel, 12Kg/t half steel, 13Kg/t half steel and 2.5Kg/t half steel; During oxygen supply time 920 seconds, oxygen feeding stop promotes oxygen rifle, now bessemer furnace slag basicity is 3.2, obtains the molten steel that temperature is 1675 DEG C, the main component of molten steel: 0.041%C, 0.05%Mn, 0.006%P, 0.0028%S, the a [O] of 0.067%, surplus is Fe and inevitable impurity.Then slag-stopping tapping is carried out, in ladle, the fluorite of quickened lime 4kg/t steel and 0.5Kg/t half steel is added in tapping process, in tapping process, add mid-carbon fe-mn 3.3kg/t steel, alloy is added by feed bin, adds slag supplying agent 3.2Kg/t molten steel after having gone out steel on the ladle top of the slag.Obtain 218 tons, the molten steel of alloying, temperature is 1592 DEG C, and its composition is 0.007%P, 0.0040%S, 0.042%C, 0.05%Mn, 0.064%a [O], and surplus is Fe.
Molten steel is sent to LF process again, by molten steel by the electrically heated of LF stove and refining.When ladle is to LF electrically heated, the treatment time is after 23min, stops heating.Set off after soft blow argon 6min, LF out-station temperature is 1633 DEG C.Molten steel composition after process is 0.008%P, 0.0042%S, 0.23%Mn, 0.044%C, 0.066%a [O], and surplus is Fe and inevitable impurity.
Ladle after LF process is delivered to RH vacuum-treat, and now temperature is 1621 DEG C, and carbon content is 0.044%, a [O] is 0.066%, does not need oxygen blast.Start to vacuumize, lift gas flow is 1800NL/min.Within 3min final vacuum degree is reduced to 300Pa, lift gas flow is adjusted to 2400NL/min, the treatment time that vacuum tightness is less than 3mbar is 13min; After process 13min, keep vacuum tightness, recording oxygen activity is 0.032%, then adds aluminum shot 0.55kg/ to molten steel in vacuum chamber
t steel, carry out deoxidation.After adding aluminum shot 2min, add manganese metal 0.9kg/ sequentially
t steel, low-carbon ferrosilicon 16Kg/
t steel, Al ball 3.2Kg/
t steelcarry out alloying.After alloy adds, adjustment lift gas flow is to 2000NL/min, and after continuing process 8min, vacuum breaker, RH process terminates.In ladle, the top of the slag adds slag supplying agent 1.5kg/t molten steel, and after ladle adopts the argon flow amount BOTTOM ARGON BLOWING 6min of 35NL/min, molten steel sets off, and departures molten steel composition is 0.008%P, 0.005%S, 0.0018%C.Then ladle is sent to continuous casting.Namely molten steel in this ladle is obtained section by employing continuous casting protection pouring Technology is 220mm × 1150mm hypoxemia low-carbon electrical steel strand product.
Casting process need adding covering agent in 20kg low-carbon (LC) in tundish, and crystallizer protecting residue adopts low carbon protective slag, and casting process pulling rate adopts 1.0m/min to control.To its T of continuously cast bloom sampling analysis [O] produced be 0.0018%, carbon content 0.0023%, silicon 1.10%, manganese 0.30%, phosphorus 0.008%, sulphur 0.005%, surplus be iron and trace impurity.
Example 3
Take hot metal containing V-Ti as raw material, its main component is: 4.3%C, 0.27%V, 0.13%Mn, 0.068%S, 0.086%P, 0.15%Si, 0.15%Ti and a small amount of inevitably impurity; This molten iron is blended into 210t blowing vanadium extracting bessemerize, the amount of being blended into is 236t, then in converter extracting vanadium, refrigerant is added, and adopt 339 oxygen rifles to carry out oxygen supply to blow vanadium, in the 3min blowing vanadium, in stove, add 2.3t iron scale, after oxygen supply 5.1min, in stove, add 320kg magnesia carry out residue adjustment, then oxygen supply is carried out pushing off the slag for 42 seconds and gone out half steel and vanadium slag, blow end point temperature is 1438 DEG C.Half composition of steel obtained is: 3.80%C, 0.05%Mn, 0.086%P, 0.067%S, 0.023%V, surplus is Fe and inevitable impurity.
Half steel after vanadium extraction is delivered to desulfurization station and carries out desulfurization, adopt composite blowing or the desulfurization of KR method.Adopt the desulfurization of KR method, churning time is 43min; Sweetening agent is deactivating magnesium powder and lime, and lime consumption amount is 5.5kg/t
molten iron; Deactivating magnesium powder consumption is 1.2kg/t
molten iron.Half composition of steel obtained after desulfurization is: 3.8%C, 0.05%Mn, 0.082%P, 0.002%S, 0.022%V and inevitably impurity.
Half steel after desulfurization is blended into 210t blow again steel converter blowing, the amount of being blended into is 237t, and adopt 536 oxygen rifles to carry out the decarburization of oxygen supply slag making dephosphorization, starting oxygen blown while, carry out steelmaking slagging, slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is added in stove, and slag making materials is all added opening to blow in oxygen supply 6min, the add-on of slag making materials quickened lime, quartz sand, high magnesium lime and sludge ball of steel smelting is respectively 17Kg/t half steel, 10Kg/t half steel, 15Kg/t half steel and 2.3Kg/t half steel; During oxygen supply time 910 seconds, oxygen feeding stop promotes oxygen rifle, now bessemer furnace slag basicity is 3.4, obtains the molten steel that temperature is 1682 DEG C, the main component of molten steel: 0.055%C, 0.05%Mn, 0.004%P, 0.0025%S, the a [O] of 0.047%, surplus is Fe and inevitable impurity.Then slag-stopping tapping is carried out, in ladle, the fluorite of quickened lime 4kg/t steel and 0.5Kg/t half steel is added in tapping process, in tapping process, add mid-carbon fe-mn 3.2kg/t steel, alloy is added by feed bin, adds slag supplying agent 3.2Kg/t molten steel after having gone out steel on the ladle top of the slag.Obtain 221 tons, the molten steel of alloying, temperature is 1585 DEG C, and its composition is 0.005%P, 0.003%S, 0.056%C, 0.05%Mn, 0.046%a [O], and surplus is Fe and inevitable impurity.
Molten steel is sent to LF process again, by molten steel by the electrically heated of LF stove and refining.When ladle is to LF electrically heated, the treatment time is after 24min, stops heating.Set off after soft blow argon 6min, LF out-station temperature is 1628 DEG C.Molten steel composition after process is 0.006%P, 0.0036%S, 0.24%Mn, 0.057%C, 0.048%a [O], and surplus is Fe and inevitable impurity.
Ladle after LF process is delivered to RH vacuum-treat, and now temperature is 1619 DEG C, and carbon content is 0.058%, a [O] is 0.048%, needs oxygen blast carbon drop 0.01%, needs oxygen blast 22Nm according to formula
3.Start to vacuumize, after 1min, pressure is reduced to 110KPa, by vacuum chamber top decline oxygen rifle to molten steel face 1m, oxygen blast 26Nm
3, after 1min, oxygen blast completes.When vacuum-treat starts, lift gas flow is 1800NL/min.Within 6min final vacuum degree is reduced to 300Pa, lift gas flow is adjusted to 2500NL/min, the treatment time that vacuum tightness is less than 300Pa is 14min; After process 14min, keep vacuum tightness, recording oxygen activity is 0.026%, then adds aluminum shot 0.3kg/ to molten steel in vacuum chamber
t steel, carry out deoxidation.After adding aluminum shot 2min, add manganese metal 0.55kg/ sequentially
t steel, low-carbon ferrosilicon 12.8Kg/
t steel, Al ball 3.3Kg/
t steelcarry out alloying.After alloy adds, adjustment lift gas flow is to 1800NL/min, and after continuing process 7min, vacuum breaker, RH process terminates.In ladle, the top of the slag adds slag supplying agent 1.7kg/t molten steel, and after ladle adopts the argon flow amount BOTTOM ARGON BLOWING 6min of 35NL/min, molten steel sets off, and departures molten steel composition is 0.007%P, 0.004%S, 0.0021%C.Then ladle is sent to continuous casting.Namely molten steel in this ladle is obtained section by employing continuous casting protection pouring Technology is 230mm × 1850mm hypoxemia low-carbon electrical steel strand product.
Casting process need adding covering agent in 25kg low-carbon (LC) in tundish, and crystallizer protecting residue adopts low carbon protective slag, and casting process pulling rate adopts 1.2m/min to control.To its T of continuously cast bloom sampling analysis [O] produced be 0.0016%, carbon content 0.0026%, silicon 1.00%, manganese 0.25%, phosphorus 0.007%, sulphur 0.004%, surplus be iron and trace impurity.
Although describe the present invention with exemplary embodiment by reference to the accompanying drawings above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (5)
1. produce a hypoxemia low-carbon electrical steel method, described method comprises the step that next coming in order carry out:
To composition be the C of 3.5 ~ 4.5wt%, S, the Si of 0.1 ~ 0.3wt% of the P of the Mn of the V of 0.25 ~ 0.35wt%, 0.1 ~ 0.3wt%, 0.05 ~ 0.12wt%, 0.05 ~ 0.12wt%, the Fe of the Ti of 0.1 ~ 0.3wt% and surplus and the hot metal containing V-Ti of inevitable impurity carry out vanadium extraction by converter blowing, enters vanadium slag and P≤0.040wt%, S≤0.005wt% in half steel molten steel to make the v element of more than 85wt% in hot metal containing V-Ti;
Desulfurization is carried out to half steel molten steel, to make S≤0.002wt% wherein;
Half steel molten steel is added converter, and in converter, add the slag making materials be made up of the sludge ball of steel smelting of the quartz sand of the quickened lime of 15 ~ 20kg/t half steel, 10 ~ 15kg/t half steel, the high magnesium lime of 10 ~ 15kg/t half steel and 2 ~ 3kg/t half steel, and oxygen supply intensity is controlled to be 3 ~ 6Nm
3/ (mint steel), be that 1.5 ~ 2.5m bessemerizes by control of lance position, and converting process temperature is controlled to be 1550 ~ 1680 DEG C;
Slag-stopping tapping is to ladle, and in molten steel, the quickened lime of 3 ~ 8kg/t half steel and the fluorite of 0.5 ~ 2kg/t half steel is added in the process of tapping, in molten steel, add the mid-carbon fe-mn 3 ~ 4kg/t steel required for molten steel target component simultaneously, after having tapped, add containing aluminium slag supplying agent 2 ~ 6kg/t steel to the ladle top of the slag, described containing the Al of aluminium slag supplying agent composition by 35 ~ 45wt%
2o
3, the CaO of 35 ~ 45wt% and>=10wt% Al composition;
Carry out LF refining, to be controlled to be 1620 ~ 1640 DEG C by liquid steel temperature;
Molten steel enters RH vacuum-treat station, and first carry out first time thermometric and determine oxygen, when carbon content is greater than oxygen activity, determine that blowing oxygen quantity carries out oxygen decarburization, the not oxygen blast when carbon content is not more than oxygen activity according to formula 1, described formula 1 is: blowing oxygen quantity Nm
3=(1.0 ~ 1.5) × [C] × W, wherein, the difference that [C] is carbon content and oxygen activity, W is molten steel amount, and unit is kg, then, under not higher than the vacuum tightness of 100Pa, vacuum-treat is carried out to molten steel, and in vacuum process, carry out second time thermometric determine oxygen, and in molten steel, add aluminium according to formula 2 and carry out deoxidation, alloying is carried out according to the requirement of Si and Mn in target molten steel composition after deoxidation, wherein, it is 15 ~ 25min that vacuum processing time before second time thermometric determines oxygen controls, it is 7 ~ 12min that vacuum processing time after alloying controls, described formula 2 is aluminum shot add-on kg=(0.2 ~ 0.6) a [O] W/210, wherein, a [O] is molten steel oxygen activity, unit ppm, W is molten steel amount in ladle, unit is ton,
After RH vacuum-treat completes, in molten steel, add 0.5 ~ 1.5kg/t steel containing aluminium slag supplying agent, and carry out BOTTOM ARGON BLOWING to ladle, BOTTOM ARGON BLOWING flow is 150 ~ 200NL/min, and BOTTOM ARGON BLOWING time controling is for being not less than 6min;
Sheet billet continuous casting, obtain electrical steel, the composition of this electrical steel is by weight percentage: carbon≤0.005%, silicon 0.80% ~ 1.1%, manganese 0.20% ~ 0.30%, phosphorus≤0.015%, sulphur≤0.008%, T [O]≤0.002%, surplus are iron and trace impurity.
2. production hypoxemia low-carbon electrical steel method according to claim 1, describedly carry out in vacuum treated step to molten steel, lift gas flow is: front 3min is 1600 ~ 1800NL/min, 3 ~ 18min adopts 2000 ~ 2500NL/min, 18min-vacuum-treat process to terminate employing 1800 ~ 2000NL/min.
3. production hypoxemia low-carbon electrical steel method according to claim 1, the pulling speed of continuous casting of described sheet billet continuous casting step is 0.9-1.2m/s.
4. production hypoxemia low-carbon electrical steel method according to claim 1, described sheet billet continuous casting step adopts covering agent in low-carbon (LC) to cover the molten steel surface in tundish completely.
5. production hypoxemia low-carbon electrical steel method according to claim 1, described sheet billet continuous casting step adopts low carbon protective slag as crystallizer protecting residue.
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