CN117701823A - Method for smelting non-oriented silicon steel by vanadium extraction semisteel - Google Patents
Method for smelting non-oriented silicon steel by vanadium extraction semisteel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 33
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000605 extraction Methods 0.000 title claims abstract description 31
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 26
- 238000003723 Smelting Methods 0.000 title claims abstract description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 230000008569 process Effects 0.000 claims abstract description 33
- 238000007670 refining Methods 0.000 claims abstract description 33
- 229910052786 argon Inorganic materials 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 28
- 238000007664 blowing Methods 0.000 claims abstract description 26
- 238000009628 steelmaking Methods 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 14
- 230000023556 desulfurization Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000010436 fluorite Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 238000005261 decarburization Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000010459 dolomite Substances 0.000 claims description 6
- 229910000514 dolomite Inorganic materials 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims description 3
- 206010039897 Sedation Diseases 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 230000036280 sedation Effects 0.000 claims description 2
- 229910000676 Si alloy Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000011819 refractory material Substances 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 239000011572 manganese Substances 0.000 description 4
- 238000004886 process control Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a method for smelting non-oriented silicon steel by vanadium extraction semisteel, and belongs to the technical field of metallurgy. The method comprises the working procedures of vanadium extraction by a converter, desulfurization, converter steelmaking, LF refining, RH refining and continuous casting; the LF refining process takes temperature rising as a main purpose, deoxidizing agent is strictly forbidden in the process, nitrogen adding is strictly controlled, large argon stirring is forbidden, 150-300 kg of submerged arc slag and 100-200 kg of fluorite are added before heating for slagging; stopping the treatment when the temperature of the molten steel reaches the target temperature, and then adding the carbon-free covering agent. And RH refining, namely operating and vacuumizing the non-oriented silicon steel RH treatment vacuum pump in a pre-vacuum mode, and gradually increasing the flow of circulating argon according to the carbon-oxygen reaction. The invention adopts the LF heating-RH duplex technology, is beneficial to reducing the oxygen blowing operation of the RH oxygen lance, reduces the corrosion of refractory materials, reduces the use frequency of the oxygen lance, prolongs the service life of the oxygen lance and reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for smelting non-oriented silicon steel by vanadium extraction semisteel.
Background
The non-oriented silicon steel is an electrical material, mainly comprises silicon and iron, is an important material for manufacturing transformers, motors, generators and the like, has low loss, high magnetic permeability and excellent magnetic resonance physical properties, can effectively reduce the energy loss of electrical equipment, improve the efficiency and stability of the equipment, can also enhance the magnetic field intensity and sensitivity of the equipment, and plays an important role in manufacturing and application of the electrical equipment.
At present, the prior art has long desulfurization time and large desulfurization difficulty, and the sulfur content in the produced non-oriented silicon steel product is higher. Because of the specificity of component design, the content of acid-soluble aluminum in the finished product must reach more than 0.2wt%, and the content of acid-soluble aluminum in the steel is more than 10 times of that of common aluminum killed steel, the flocculation phenomenon of molten steel is very easy to be caused in the continuous casting and pouring process, so that each production process must be strictly controlled to ensure stable production.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for smelting non-oriented silicon steel by extracting vanadium semisteel, which is beneficial to reducing oxygen blowing operation of an RH oxygen lance, reducing corrosion resistance materials, reducing the use frequency of the oxygen lance, prolonging the service life of the oxygen lance and reducing production cost by adopting an LF heating-RH duplex process.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
a method for smelting non-oriented silicon steel by vanadium extraction semisteel comprises the working procedures of vanadium extraction by a converter, desulfurization by the converter, steelmaking by the converter, LF refining, RH refining and continuous casting;
the LF refining process takes temperature rising as a main purpose, wherein deoxidizing agent is strictly forbidden in the process, nitrogen adding is strictly controlled, large argon stirring is forbidden, 150-300 kg of submerged arc slag and 100-200 kg of fluorite are added before heating to form slag; stopping the treatment when the temperature of the molten steel reaches the target temperature, controlling the target temperature of a first furnace to be 1660-1670 ℃, adding 100-150 kg of carbon-free covering agent, and discharging and lifting to an RH refining furnace;
the RH refining process is characterized in that a non-oriented silicon steel RH present treatment vacuum pump is operated in a pre-vacuum mode for vacuumizing, the flow of circulating argon is gradually increased according to the carbon-oxygen reaction, and the argon in the early stage of decarburization is controlled at 90Nm 3 And/h, the reaction change of molten steel in the vacuum chamber is started along with the pump stage of the vacuum pump, and the carbon-oxygen reaction tends to smoothly increase the circulating argon to 120Nm 3 /h; maintaining the decarburization below the minimum vacuum degree 67pa of the vacuum tank for more than or equal to 20min, filling residual decarburization time, measuring the oxygen value after decarburization, calculating the adding amount of the deoxidizer aluminum according to the oxygen value after decarburization, circulating for 3min to deoxidize the molten steel, adding the aluminum according to the calculated adding amount, alloying the molten steel, and adjusting the alloy component compensation to reach the upper limit of the process target Als of 0.20-0.30 percent at one time; ferrosilicon is added after molten steel circulates for 2min so that the content of the ferrosilicon meets the quality requirement target Si:1.00 to 1.30 percent.
According to the converter vanadium extraction process, the temperature of molten iron is measured, the temperature of molten iron which is sampled and added into the converter is 1320-1360 ℃, the lance position is controlled to blow pure oxygen, the adding amount of pellets and iron balls is adjusted according to the range of Si+Ti=0.2-0.3% of the chemical sample composition of molten iron, the tapping temperature of semisteel is 1330-1390 ℃, and semisteel is lifted to desulfurization treatment.
In the vanadium extraction process of the converter, pure oxygen blowing is controlled for 4min, the nitrogen blowing mode is online in the blowing process, and the flow is controlled to be 150-300L/min.
According to the converter desulfurization process, magnesium particles and lime are subjected to lower gun composite blowing, slag skimming treatment is carried out for multiple times, so that slag skimming effect is ensured, and S in semisteel fed into a steelmaking converter is ensured to be less than or equal to 0.003wt%.
The converter steelmaking process controls the whole process bottom blowing argon flow to be 200-400 Nm 3 And (h) strictly forbidden to add the slag-melting balls, the mechanically burned return ores and the light burned dolomite, only lime, raw dolomite and a modifier are added for slag formation, and the oxygen is at the end point of the converterMarked as O]: 600-800 ppm, controlling the composition of molten steel at the end point: 0.03 to 0.04 percent of C, less than or equal to 0.005 percent of S and less than or equal to 0.015 percent of P.
The steel-making process of the converter has the advantages that the steel-making time is 5-8 min, the steel flow is smooth and does not scatter, the steel-making process adopts low-carbon ferromanganese alloying, the target Mn is 0.22wt%, and 300kg of small-grain lime is uniformly added along with the steel flow.
In the converter steelmaking process, a sliding plate slag blocking method and a slag blocking plug are adopted to block slag, slag discharging is strictly forbidden, and a steel ladle free space is ensured to be 300-500 mm after tapping; the first furnace temperature at the end point of the converter is not less than 1690 ℃; before tapping, opening the ladle, blowing argon gas for 2min to replace gas in the ladle, and after tapping, lifting to an LF refining furnace for treatment.
In the RH refining process, the steam pressure of an RH furnace is more than or equal to 1.30Mpa, the steam temperature is more than or equal to 195 ℃, the aperture of a dipping pipe is more than or equal to 450mm, the circulation gas condition is good, the RH vacuum degree is less than 67pa, and the top lance flow is 400-600 Nm in the earlier stage of RH smelting for 1-1.5 h 3 And (3) baking the tank, namely carrying out 2-4 furnace washing tanks, wherein the argon station of the steel for washing the tank requires that the argon temperature is not less than 1630 ℃, and ensuring that the vacuum tank is clean and free of cold steel.
In the RH refining process, the target times of adding low-carbon ferromanganese and aluminum are respectively less than or equal to 2 times; alloying process, ensuring pure circulation time of 8-10 min, and sedation time of 15-20 min, and not performing calcium treatment and weak argon blowing operation after smelting; outbound gas control targets: [ O ] is less than or equal to 5ppm, and N is less than or equal to 20ppm; the target temperature of the first furnace molten steel is 1605-1615 ℃.
The molten steel obtained by the method comprises the following main chemical components in percentage by mass: c is less than or equal to 0.0040 percent, si:1.00 to 1.30 percent, 0.15 to 0.25 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.30 percent of Als, less than or equal to 20ppm of N, less than or equal to 5ppm of [ O ] and other chemical residual elements as required: v is less than or equal to 0.006%, cr is less than or equal to 0.10%, cu is less than or equal to 0.20%, and Ni is less than or equal to 0.15%.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention does not affect the extraction of noble metals vanadium and titanium in the vanadium-titanium molten iron while producing the non-oriented silicon steel, thereby saving mineral resources. The sulfur content of molten steel is reduced through vanadium extraction and desulfurization processes, the sulfur content in a non-oriented silicon steel finished product can be effectively reduced after converter steelmaking and RH refining treatment, the desulfurization time is shortened under the same molten iron condition, and the desulfurization operation difficulty is reduced. The vanadium extraction and the titanium extraction of noble metals are added while the vanadium extraction and the sulfur removal processes of the converter are used, so that the qualification rate of molten steel is ensured, and the smelting cost of smelting non-oriented silicon steel by the converter due to the fact that sulfur components are not mixed is saved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples 1 to 6
A method for smelting non-oriented silicon steel by vanadium extraction semisteel comprises the working procedures of vanadium extraction by a converter, desulfurization by the converter, steelmaking by the converter, LF refining, RH refining and continuous casting; the specific control parameters are as follows:
(1) Extracting vanadium from a converter: the temperature of molten iron is measured, the temperature of molten iron charged into a furnace by sampling is 1320-1360 ℃, the pure oxygen blowing under a gun position is controlled, the adding amount of pellets and iron balls is adjusted according to the range of Si+Ti=0.2-0.3% of the chemical sample composition of molten iron, the pure oxygen blowing is controlled for 4min, the online nitrogen blowing mode is controlled in the blowing process, and the flow is controlled to be 150-300L/min. Controlling vanadium slag, tapping the semisteel at 1330-1390 ℃, and lifting the semisteel after tapping to desulfurization treatment.
Examples 1-6 converter vanadium extraction process control parameters are shown in Table 1.
Table 1 examples 1-6 converter vanadium extraction process control parameters
(2) Desulfurizing in a converter: the magnesium particles and lime are used for composite blowing, slag skimming treatment is carried out for a plurality of times, slag skimming effect is ensured, and S in semisteel entering a steelmaking converter is ensured to be less than or equal to 0.003wt%.
(3) Converter steelmaking: the converter steelmaking blowing early stage slag formation is adopted, so that low-temperature dephosphorization is facilitated. Controlling the whole process bottom blowing argon flow to be 200-400 Nm 3 And/h. Adding slag balls, mechanically burned return ores and light burned dolomite strictly, only adding lime, raw dolomite and modifier for slagging, wherein the oxygen target of the converter end point is [ O ]]: 600-800 ppm, controlling the composition of molten steel at the end point: c0.030.04wt% or less of S, 0.005wt% or less of P, and 0.015wt% or less of P. The tapping time is 5-8 min, the steel flow is smooth and does not scatter, the tapping process adopts low-carbon ferromanganese alloying, and the target Mn is 0.22wt%. And 300 kg/furnace of small lime is added uniformly along with the steel flow. The sliding plate is adopted to stop slag and the slag stopper is adopted to stop slag, slag discharging is strictly forbidden, and the free space of the steel ladle is ensured to be 300-500 mm after tapping. The first furnace temperature at the end point of the converter is more than or equal to 1690 ℃. And opening the ladle bottom argon blowing for 2min before tapping of the converter after ladle seating, replacing gas in the ladle, and lifting to an LF refining furnace for treatment after tapping.
Examples 1-6 converter steelmaking process control parameters are shown in Table 2.
Table 2 examples 1-6 converter steelmaking process control parameters
(4) LF refining: taking temperature rising as a main purpose, strictly forbidden to add deoxidizing agent in the process, strictly controlled nitrogen adding, forbidden to stir large argon, and adding 150-300 kg of submerged arc slag and 100-200 kg of fluorite for slagging before heating; stopping the treatment when the temperature of the molten steel reaches the target temperature, controlling the target temperature of the first furnace at 1660-1670 ℃, adding 100-150 kg of carbon-free covering agent, and discharging and lifting to an RH refining furnace.
Examples 1-6 LF refining process control parameters are shown in Table 3.
TABLE 3 control parameters for refining Process examples 1-6 LF
(5) RH refining: the steam pressure of the RH furnace is more than or equal to 1.30Mpa, the steam temperature is more than or equal to 195 ℃, the aperture of the dipping pipe is more than or equal to 450mm, the circulation air condition is good, the RH vacuum degree is less than 67pa, and the top lance flow is 400-600 Nm in the earlier stage of RH smelting for 1-1.5 h 3 And (3) baking the tank. 2-4 furnace washing tanks are carried out, the temperature of the bath steel argon station after argon is required to be more than or equal to 1630 ℃, the vacuum tank is clean and free of cold steel, the non-oriented silicon steel RH treatment vacuum pump can carry out operation and vacuum pumping in a pre-vacuum (4 a) mode, and a camera in the vacuum tank is used for carrying out vacuum pumping according to carbon oxygenThe reaction gradually increases the flow of circulating argon, the adding amount of low-carbon ferromanganese or (metal manganese) is adjusted to reach the upper limit of the quality target control requirement according to the chemical sample of the LF refining furnace in the early stage of decarburization, and the argon is controlled at 90Nm 3 And/h, the reaction change of molten steel in the vacuum chamber is started along with the pump stage of the vacuum pump, and the carbon-oxygen reaction tends to smoothly increase the circulating argon to 120Nm 3 And/h. The carbon-oxygen reaction process is accelerated, and the higher the CO content of the molten steel is, the higher the stirring intensity is, the higher the decarburization speed of the interface between the liquid drop and the oxygen reaction is. Maintaining the minimum vacuum degree of the vacuum tank below 67pa for more than or equal to 20min, charging residual decarburization time, measuring the oxygen value after decarburization, calculating the amount of aluminum (Al) added with a deoxidizer according to the oxygen value after decarburization, adding the aluminum (Al) into the vacuum tank after circulation for 3min to deoxidize the molten steel, alloying the molten steel according to the calculated added amount, and adjusting alloy component compensation to reach the upper limit of the process target Als of 0.20-0.30 percent at one time. Ferrosilicon is added after molten steel circulates for 2min so that the content of the ferrosilicon meets the quality requirement target Si:1.00 to 1.30 percent.
The target times of adding low-carbon ferromanganese and aluminum are respectively less than or equal to 2 times. The alloying process ensures the pure circulation time to be 8-10 min, the calm time to be 15-20 min, and the smelting is finished without calcium treatment and weak argon blowing operation. Outbound gas control targets: [ O ] is less than or equal to 5ppm, and N is less than or equal to 20ppm. The target temperature of the first furnace molten steel is 1605-1615 ℃.
(6) Continuous casting process: realizing continuous casting and constant-speed pouring.
Examples 1-6 RH refining process control parameters are shown in tables 4 and 5.
The molten steels obtained in examples 1 to 6 were mainly chemical compositions and mass percentages were shown in Table 6.
TABLE 4 examples 1-6 RH refining Process control parameters-1
TABLE 5 examples 1-6 RH refining Process control parameters-2
TABLE 6 chemical compositions and mass percentage (%)
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (10)
1. A method for smelting non-oriented silicon steel by vanadium extraction semisteel is characterized by comprising the working procedures of vanadium extraction by a converter, desulfurization, converter steelmaking, LF refining, RH refining and continuous casting;
the LF refining process takes temperature rising as a main purpose, wherein deoxidizing agent is strictly forbidden in the process, nitrogen adding is strictly controlled, large argon stirring is forbidden, 150-300 kg of submerged arc slag and 100-200 kg of fluorite are added before heating to form slag; stopping the treatment when the temperature of the molten steel reaches the target temperature, controlling the target temperature of a first furnace to be 1660-1670 ℃, adding 100-150 kg of carbon-free covering agent, and discharging and lifting to an RH refining furnace;
the RH refining process is characterized in that a non-oriented silicon steel RH present treatment vacuum pump is operated in a pre-vacuum mode for vacuumizing, the flow of circulating argon is gradually increased according to the carbon-oxygen reaction, and the argon in the early stage of decarburization is controlled at 90Nm 3 And/h, the reaction change of molten steel in the vacuum chamber is started along with the pump stage of the vacuum pump, and the carbon-oxygen reaction tends to smoothly increase the circulating argon to 120Nm 3 /h; maintaining the decarburization below the minimum vacuum degree 67pa of the vacuum tank for more than or equal to 20min, filling residual decarburization time, measuring the oxygen value after decarburization, calculating the adding amount of the deoxidizer aluminum according to the oxygen value after decarburization, circulating for 3min to deoxidize the molten steel, adding the aluminum according to the calculated adding amount, alloying the molten steel, and adjusting the alloy component compensation to reach the upper limit of the process target Als of 0.20-0.30 percent at one time; molten steel is circulated for 2min, ferrosilicon is added to enableThe content of the silicon alloy meets the quality requirement target Si:1.00 to 1.30 percent.
2. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 1, wherein the converter vanadium extraction procedure comprises the steps of measuring the temperature of molten iron, sampling the molten iron charged into the converter to 1320-1360 ℃, controlling the lance pure oxygen blowing at a lance position, adjusting the addition amount of pellets and iron balls according to the range of Si+Ti=0.2-0.3% of the chemical sample composition of the molten iron, and tapping the semisteel to 1330-1390 ℃ to finish the semisteel lifting to desulfurization treatment.
3. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 2, wherein the converter vanadium extraction process is controlled to carry out pure oxygen blowing for 4min, the online nitrogen blowing mode is adopted in the blowing process, and the flow is controlled to be 150-300L/min.
4. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 3, wherein the converter desulfurization procedure utilizes magnesium particles and lime to perform down-lance composite blowing, and slag skimming treatment is performed for a plurality of times, so that slag skimming effect is ensured, and S in semisteel entering a steelmaking converter is ensured to be less than or equal to 0.003wt%.
5. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 4, wherein the converter steelmaking process controls the whole process bottom blowing argon flow rate to be 200-400 Nm 3 And (3) strictly forbidden to add the slag-melting balls, the mechanically burned return ores and the light burned dolomite, only lime, raw dolomite and a modifier are added for slagging, and the oxygen target of the converter end point is [ O ]]: 600-800 ppm, controlling the composition of molten steel at the end point: 0.03 to 0.04 percent of C, less than or equal to 0.005 percent of S and less than or equal to 0.015 percent of P.
6. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 5, wherein the steel making process of the converter is carried out for 5-8 min, steel flow is smooth and free from scattering, low-carbon ferromanganese alloying is adopted in the steel making process, the target Mn is 0.22wt%, and 300kg of small lime is added along with the steel flow.
7. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 6, wherein in the converter steelmaking process, a sliding plate slag stopping method and a slag stopping plug slag stopping method are adopted to strictly prevent slag discharging, and a steel ladle free space is ensured to be 300-500 mm after tapping; the first furnace temperature at the end point of the converter is not less than 1690 ℃; before tapping, opening the ladle, blowing argon gas for 2min to replace gas in the ladle, and after tapping, lifting to an LF refining furnace for treatment.
8. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 7, wherein the RH refining process is characterized in that the steam pressure of an RH furnace is more than or equal to 1.30Mpa, the steam temperature is more than or equal to 195 ℃, the aperture of a dipping pipe is more than or equal to 450mm, the circulation gas condition is good, the RH vacuum degree is less than 67pa, and the top lance flow is 400-600 Nm in the earlier stage of RH smelting for 1-1.5 h 3 And (3) baking the tank, namely carrying out 2-4 furnace washing tanks, wherein the argon station of the steel for washing the tank requires that the argon temperature is not less than 1630 ℃, and ensuring that the vacuum tank is clean and free of cold steel.
9. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to claim 8, wherein the RH refining process is characterized in that the target times of adding low-carbon ferromanganese and aluminum are respectively less than or equal to 2 times; alloying process, ensuring pure circulation time of 8-10 min, and sedation time of 15-20 min, and not performing calcium treatment and weak argon blowing operation after smelting; outbound gas control targets: [ O ] is less than or equal to 5ppm, and N is less than or equal to 20ppm; the target temperature of the first furnace molten steel is 1605-1615 ℃.
10. The method for smelting non-oriented silicon steel by vanadium extraction semisteel according to any one of claims 1 to 9, wherein the main chemical components and mass percentage contents of molten steel obtained by the method are: c is less than or equal to 0.0040 percent, si:1.00 to 1.30 percent, 0.15 to 0.25 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.30 percent of Als, less than or equal to 20ppm of N, less than or equal to 5ppm of [ O ] and other chemical residual elements as required: v is less than or equal to 0.006%, cr is less than or equal to 0.10%, cu is less than or equal to 0.20%, and Ni is less than or equal to 0.15%.
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