CN114672615B - Deoxidizing method for low-carbon wiredrawing steel Q195LB - Google Patents
Deoxidizing method for low-carbon wiredrawing steel Q195LB Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 156
- 239000010959 steel Substances 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 39
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 21
- 238000005491 wire drawing Methods 0.000 title claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 97
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 95
- 239000010703 silicon Substances 0.000 claims abstract description 95
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 70
- 239000000843 powder Substances 0.000 claims abstract description 64
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000001301 oxygen Substances 0.000 claims abstract description 58
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 58
- 229910052786 argon Inorganic materials 0.000 claims abstract description 46
- 238000007664 blowing Methods 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000007670 refining Methods 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims description 53
- 229910052782 aluminium Inorganic materials 0.000 claims description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 17
- 239000004571 lime Substances 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 15
- 238000005275 alloying Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 4
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 9
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- -1 etc. Inorganic materials 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of steelmaking external refining, in particular to a deoxidization method of low-carbon wiredrawing steel Q195LB, which can accurately determine silicon loss according to argon blowing flow (exposed diameter of molten steel) and power transmission time (electric arc length), and further accurately deoxidize target oxygen value by adding corresponding amount of ferrosilicon powder according to the specific silicon loss.
Description
Technical Field
The invention relates to the technical field of steelmaking external refining, in particular to a deoxidization method for low-carbon wiredrawing steel Q195 LB.
Background
When producing low-carbon welding wire steel, no matter top suction or side suction dust removal, LF refining slagging generally adopts ferrosilicon powder to carry out diffusion deoxidation on the slag surface of slag, white slag is produced by increasing the thickness of a slag layer, and the submerged arc effect of the whole refining process is maintained, but the increasing slag quantity cannot play the role of foaming capacity of the slag and increase the cost of slag, ferrosilicon powder is easy to be involved into molten steel for silicon increase, ferrosilicon powder cannot fully reduce FeO+MnO in the slag when the slag is foamed, incomplete reduction of oxides in the slag is easy to be caused, and when LF refining is carried out, along with the temperature rise, oxygen in the slag returns to the molten steel again, so that secondary oxidization of the molten steel is caused, and total oxygen in the steel is higher.
The related art has difficulty in accurate and reliable deoxidation.
Disclosure of Invention
The invention aims to provide a deoxidizing method for low-carbon wiredrawing steel Q195LB, which can accurately and reliably deoxidize.
The invention is realized in the following way:
in a first aspect, the invention provides a deoxidizing method for low-carbon wiredrawing steel Q195LB, comprising:
s1: deoxidizing and alloying molten steel and slag washing the molten steel after tapping through a converter;
s2: sampling at an argon station;
s3: LF refining to stop oxygen determination, and adding a slag surface deoxidizer according to an oxygen value;
s4: 1) Adding ferrosilicon powder according to the silicon content of the argon station sample to carry out slag surface deoxidation;
2) According to the argon blowing flow and the power transmission time, adding ferrosilicon powder corresponding to the silicon loss of the steel grade; wherein,,
total silicon loss w1=0.00006% x Ar (1 cm) x t1+0.00006% x Ar (2 cm) x t2+ … … +0.00006% x Ar (50 cm) x t50 when argon is blown, wherein Ar (1 cm) to Ar (50 cm) are different molten steel exposure diameters, and t1 to t50 are different molten steel exposure diameters argon blowing times (min);
total silicon loss w2=0.00275% +0.0005% × (K1 gear-5) +0.00055% ×k2 gear+0.0006% ×k3 gear+0.00065% ×k4 gear+0.0007% ×k5 gear+0.00075% ×k6 gear+0.0008% ×k7 gear+0.00085% ×k8 gear+0.0009% ×k9 gear+ 0.00095% ×k10 gear+0.001% +k11 gear, wherein, K1 gear to K11 are slag melting time (min) of 1 to 11 gear voltages, and K1 gear +.5 (min); total silicon loss W=W1+W2 caused by argon blowing flow and power transmission time; the total amount of ferrosilicon powder to be added corresponding to the total amount of silicon loss is G2=W/0.01 percent multiplied by 0.19,0.19 (kg/ton steel), and the amount of ferrosilicon powder to be added is 0.01 percent of the total amount of silicon loss;
s5: oxygen is fixed in LF sampling 1, ferrosilicon powder is added for deoxidization according to the oxygen value w [ O ] -15 ppm;
s6: according to the result of LF sampling 1, when the silicon content is less than 0.04% of the technological card target value, continuously deoxidizing by adopting ferrosilicon powder;
s7: and (2) oxygen is fixed in LF sampling 2, and ferrosilicon powder is added for deoxidation according to the fixed oxygen value w [ O ] -10 ppm.
In an alternative embodiment, 1) adding ferrosilicon powder according to the silicon content of the argon station sample in the step S4 for slag surface deoxidation specifically comprises the following steps:
when the silicon content w (Si) of the argon station sample is not less than 0.018%, no ferrosilicon powder is added in the early stage, when the silicon content w (Si) of the argon station sample is less than 0.018%, ferrosilicon powder is added according to the difference Δw (Si) of the silicon content, and the amount g1= (0.018% - Δw (Si))/0.01% ×0.19 kg/ton steel is added.
In an alternative embodiment, in step S1, the steps of deoxidizing alloying and slag washing are performed, comprising: adding 0.83-0.88 kg of silicomanganese per ton of steel, 1.66-2.1 kg of aluminum iron per ton of steel, 0.41-0.46 kg of ferrosilicon per ton of steel and 4.2-4.5 kg of lime per ton of steel into molten steel.
In an alternative embodiment, in step S3, 0.016kg X (oxygen value-30 ppm) of aluminum particles is added according to (oxygen value-30 ppm) of aluminum particles per ton of steel, and no aluminum particles are added in the middle and later stages.
In an optional embodiment, in step S3, the proportioning and adding modes of the slag surface deoxidizer include: adding 4.2-4.5 kg/ton of synthetic slag, 0.83-1.25 kg/ton of fluorite balls, 4.2-4.5 kg/ton of lime and aluminum particles in sequence in the electrifying process; wherein lime and aluminum particles are added in three batches equally, each batch of aluminum particles and lime are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton of steel, and the amount of each batch of aluminum particles is 0.016kg× (oxygen value-30 ppm)/3/ton of steel.
In an alternative embodiment, the Als content is controlled to be 0.002-0.007% after adding the slag surface deoxidizer in step S3.
In an alternative embodiment, in step S5, the ferrosilicon powder is added in an amount g3=0.016 (kg/ton of steel) × (w [ O ] -15 ppm).
In an alternative embodiment, in step S6, when the silicon content is more than or equal to 0.04% of the process card target value, the silicon powder is reduced in use or no more silicon powder is added.
In an alternative embodiment, in step S7, the ferrosilicon powder is added in an amount g4=0.016 (kg/ton of steel) × (w [ O ] -10 ppm).
In an alternative embodiment, the deoxidizing method of the low carbon wire drawing steel Q195LB further includes step S8 after step S7: continuing alloying according to the result of LF sampling 2;
s9: the content of free oxygen in the outlet is controlled to be 10-15ppm.
The invention has the following beneficial effects:
according to the deoxidization method for the low-carbon wiredrawing steel Q195LB provided by the embodiment of the invention, the silicon loss can be accurately determined according to the argon blowing flow (the exposed diameter of molten steel) and the power transmission time (the electric arc length), and the silicon loss is accurately determined according to different argon blowing flows and power transmission time lengths, so that the accurate silicon deoxidization is realized by adding the corresponding amount of silicon iron powder according to the specific silicon loss, and the target oxygen value is stably reached, namely the accurate and reliable deoxidization is realized.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the production of low carbon steel, it is generally necessary to perform deoxidization treatment. The deoxidizing method provided by the related art comprises the following steps: smelting molten steel by a converter, and refining in an LF furnace; a mixture of ferrosilicon powder and carbon powder is used as a foaming deoxidizer in an LF furnace; the deoxidization method not only is easy to cause carburetion of molten steel, but also can not realize accurate and reliable deoxidization; also related art deoxidizing methods include: deoxidizing and alloying molten steel by tapping from a converter, adding high-aluminum refining slag into an LF refining furnace according to the Als content of an argon station to deoxidize the slag surface, and adding ferrosilicon powder to deoxidize; the deoxidizing strength is insufficient, the deoxidizing measure of adding ferrosilicon powder can be adopted only after the result of the silicon content of the LF sample is obtained, the deoxidizing time is long, the operability is not strong, and the deoxidizing is not easy to be reliably and accurately finished.
The deoxidizing method of the low-carbon wiredrawing steel Q195LB of the embodiment can accurately and reliably deoxidize, and comprises the following steps:
s1: deoxidizing, alloying and slag washing molten steel after tapping through a converter; the method specifically comprises the following steps: adding 0.83-0.88 kg of silicomanganese to molten steel per ton of steel, for example: 0.83 kg/ton steel, 0.85 kg/ton steel, 0.86 kg/ton steel, 0.87 kg/ton steel, 0.88 kg/ton steel, etc., 1.66-2.1 kg/ton steel of aluminum iron, for example: 1.66 kg/ton steel, 1.8 kg/ton steel, 2.0 kg/ton steel, 2.1 kg/ton steel, etc., ferrosilicon 0.41-0.46 kg/ton steel, for example: 0.41 kg/ton steel, 0.42 kg/ton steel, 0.43 kg/ton steel, 0.44 kg/ton steel, 0.45 kg/ton steel, 0.46 kg/ton steel, etc., lime 4.2 to 4.5 kg/ton steel, for example: 4.2 kg/ton of steel, 4.3 kg/ton of steel, 4.4 kg/ton of steel, 4.5 kg/ton of steel, etc.
S2: sampling at an argon station.
S3: LF refining to stop oxygen determination, and adding slag surface deoxidizer according to the oxygen value.
The method specifically comprises the following steps: determining the amount of aluminum particles of the slag surface deoxidizer according to the oxygen value; wherein, 0.016kg× (oxygen value-30 ppm) of aluminum particles is added according to the oxygen value-30 ppm in the early stage and no aluminum particles are added in the middle and later stages.
Further, the proportion and the adding mode of the slag surface deoxidizer comprise: adding 4.2-4.5 kg/ton steel (for example, 4.2 kg/ton steel, 4.3 kg/ton steel, 4.4 kg/ton steel, 4.5 kg/ton steel and the like), 0.83-1.25 kg/ton steel (for example, 0.83 kg/ton steel, 0.9 kg/ton steel, 1.0 kg/ton steel, 1.1 kg/ton steel, 1.25 kg/ton steel and the like), 4.2-4.5 kg/ton steel (for example, 4.2 kg/ton steel, 4.3 kg/ton steel, 4.4 kg/ton steel, 4.5 kg/ton steel and the like) lime and aluminum particles into the mixture in the power-on process; wherein lime and aluminum particles are added in three batches equally, each batch of aluminum particles and lime are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton of steel, and the amount of each batch of aluminum particles is 0.016kg× (oxygen value-30 ppm)/3/ton of steel. Therefore, the slag surface deoxidizer can be uniformly scattered on the slag surface in a small batch adding mode, so that a good deoxidizing effect is achieved.
In step S3, the slag surface deoxidizer is added, and then the Als (acid-soluble aluminum content in steel) content is controlled to be 0.002 to 0.007% (e.g., 0.002%, 0.004%, 0.005%, 0.007%, etc.).
S4: 1) Adding ferrosilicon powder according to the silicon content of the argon station sample to carry out slag surface deoxidation; the method specifically comprises the following steps:
when the silicon content w (Si) of the argon station sample is more than or equal to 0.018%, no ferrosilicon powder is added in the early stage; when the Si content w (Si) of the argon station sample is less than 0.018%, ferrosilicon powder is added according to the Si content difference Deltaw (Si) according to 0.08% -Deltaw (Si), and 0.19 kg/ton of steel is required to be added for each 0.01% increase in Si content, so that the added ferrosilicon powder is in an amount of G1= (0.018% -Deltaw (Si))/0.01%. Times.0.19 kg/ton of steel.
2) According to the argon blowing flow (the exposed diameter of molten steel) and the power transmission time (the length of an electric arc), ferrosilicon powder is added according to the silicon loss of the steel grade.
The inventors have found that the argon blowing flow is 60Nm 3 At the time of/h (the exposed diameter of molten steel is 50 cm), the loss of silicon is 0.03% every 10min, namely 0.003% every 1 min; argon blowing flow rate was 35Nm 3 At the time of/h (the exposed diameter of molten steel is 25 cm), the loss of silicon is 0.015 percent every 10min, namely 0.0015 percent every 1 min; argon blowing flow is less than or equal to 10Nm 3 At the time of/h (the exposed diameter of molten steel is 0 cm), the loss of silicon is 0 every 10min, namely 0 every 1 min; it can be seen that the silicon loss is related to the flow rate of argon blowing of molten steel (the exposed diameter of molten steel), and the larger the exposed diameter of molten steel is, the more serious the secondary oxidation of molten steel is, and the larger the silicon loss is. It is found from the calculation that the silicon loss is=0.03%/10/50=0.0000 when argon is blown for 1min and the exposed diameter of molten steel is 1cm6, the silicon loss of different molten steel exposed diameters under different argon blowing time is as follows: 0.00006%. Times.Ar diameter (cm). Times.time t (min). When argon is blown from different molten steel exposure diameters, the total silicon loss W1=0.00006% ×Ar (1 cm) ×t1+0.00006% ×Ar (2 cm) ×t2+ … … +0.00006% ×Ar (50 cm) ×t50, wherein Ar (1 cm) to Ar (50 cm) are different molten steel exposure diameters, and t1 to t50 are argon blowing times (min) of different molten steel exposure diameters.
In the power transmission process, as the arc impact area is in a high temperature state, the equilibrium solubility of oxygen in molten steel is increased, and gas molecules are ionized under the action of an arc, so that the free oxygen concentration in the LF power transmission process is increased, and the silicon is oxidized and burnt. The arc length increases with the increase of the secondary voltage, and the arc length is proportional to the arc voltage; the voltage of 1-11 steps rises step by step, and the longer the arc is. The inventors have also found that the longer the arc, the more likely it is to cause secondary oxidation of the molten steel and the greater the silicon loss. Therefore, the power transmission silicon loss amount is correlated with the power transmission range. Silicon loss is 0.02% when power transmission is the most stable (the exposed diameter of argon is 25 cm) in the middle and later stage of 1-grade (low voltage) power transmission for 10min, and the silicon loss during argon blowing power transmission is the silicon loss during pure argon blowing = silicon loss during pure power transmission; pure power transmission silicon loss amount for 10 min: 0.02% -0.015% = 0.005%,1min silicon loss = 0.005%/10 = 0.0005%. The length of the electric arc gradually rises along with the voltage of 1-11 gears, and the longer the electric arc is, the larger the electric arc voltage is, and the larger the silicon loss is; taking the silicon loss amount of the low gear 1 gear (when the electric arc in the middle and later stages is the most stable) as the base number of 0.0005% (min), giving correction coefficients of other gears (2-11 gears) respectively as 1.1-2.0, and calculating the silicon loss amount of each gear for 1 min: k2: 0.0005% ×1.1=0.00055%, K3 gear: 0.0005% ×1.2=0.0006%, K4 gear: 0.0005% ×1.3=0.00065%, K5 gear: 0.0005% ×1.4=0.0007%, K6 0.0005% ×1.5=0.00075%, K7 0.0005% ×1.6=0.0008%, K8 0.0005% ×1.7=0.00085%, K9 0.0005% ×1.8=0.0009%, K10 0.0005% ×1.9= 0.00095%, K11 0.0005% ×2.0=0.001%. The LF early stage slag melting stage is generally 1-gear low-voltage power transmission, the slag melting time is generally 5min, the slag layer is thin, the submerged arc effect is not ideal, the silicon loss is larger than that when the submerged arc effect is good, and the correction coefficient is 0.0005% ×1.1=0.00055%, and the silicon loss is 0.00055% ×5=0.00275% in 5 min. The method comprises the following steps: the total silicon loss amount W2 =0.00275% +0.0005% × (K1-5) (min) +0.00055% ×k2 (min) +0.0006% ×k3 (min) +0.00065% ×k4 (min) +0.0007% ×k5 (min) +0.00075% ×k6 (min) +0.0008% ×k7 (min) +0.00085% ×k8 (min) +0.0009% ×k9 (min) +0.00095% ×k10 (min) +0.001% ×k11 (min), wherein K1 to K11 refer to slag melting time (min) of 1 to 11 voltage, and K1 +.5 (min).
Total silicon loss w=w1+w2 caused by argon blowing flow (exposed diameter of molten steel) and power transmission time (electric arc length); the total amount of ferrosilicon powder to be added corresponding to the total amount of silicon loss g2=w/0.01% ×0.19, wherein 0.19 (kg/ton steel) is 0.01% of the amount of ferrosilicon powder to be added per loss of silicon.
It should be noted that LF refining is performed to stop oxygen determination, and aluminum particles are added according to the oxygen determination value to perform slag surface deoxidation (as in step S3). Adding ferrosilicon powder according to the silicon content of the argon station sample to carry out slag surface deoxidation; thus, 2 deoxidizing materials were used in this example: aluminum particles + ferrosilicon powder. The process target of low-carbon steel deoxidation is to control the silicon content in the steel to be 0.018% as early as possible (in the argon station or the earlier stage of LF refining), and keep certain silicon content so that the dissolved oxygen in the steel is lower; if the silicon content in the steel is too low, the dissolved oxygen in the steel is higher, and the subsequent deoxidization is difficult; too high a silicon content in the steel would be too deoxidized and would easily lead to a silicon composition out of specification. The LF refining firstly utilizes aluminum particles to carry out strong deoxidation on the slag surface in a targeted manner according to the oxygen determination value, then ferrosilicon powder is added to carry out matching deoxidation, the silicon content in steel is increased while the slag surface is deoxidized, so that the dissolved oxygen in the steel is lower, further, the deoxidation is accurately and reliably realized, and adverse effects are avoided.
S5: and (3) oxygen is fixed in LF sampling 1, and ferrosilicon powder is added for deoxidation according to the oxygen value w [ O ] -15ppm. Wherein 15ppm is free oxygen of steel grade, the free oxygen is in the process requirement range, and the slag is also in the yellow-white slag level; adding ferrosilicon powder gradually for deoxidization, keeping a certain low oxygen content, and reserving risks for subsequent molten steel silicon component adjustment.
1ppm of oxygen in the steel can be removed per 0.016 kg/ton of ferrosilicon added, and the amount of ferrosilicon added in this step g3=0.016 (kg/ton of steel) × (w [ O ] -15 ppm).
S6: according to the result of LF sampling 1, when the silicon content is less than 0.04% of the technological card target value, continuously deoxidizing by adopting ferrosilicon powder; based on the risk reservation during silicon alloying, the addition of ferrosilicon powder cannot be performed in one step, and the loss of silicon during argon blowing and power transmission and the subsequent investment of deoxidized ferrosilicon powder in step S4 need to be considered. When the silicon content is more than or equal to 0.04% of the technological card target value, reducing the silicon iron powder consumption or not adding the silicon iron powder, wherein, the reducing the silicon iron powder consumption can be: the dosage of the ferrosilicon powder is less than the adding amount of the ferrosilicon powder in the previous step; in this way, the silicon content of the molten steel itself can be used to deoxidize under dynamic conditions until the silicon content is reduced.
S7: and (2) oxygen is fixed in LF sampling 2, and ferrosilicon powder is added for deoxidation according to the fixed oxygen value w [ O ] -10 ppm. Wherein 10ppm is free oxygen of steel grade, the free oxygen reaches the target requirement of outbound, and the slag is at the white slag level; after the silicon composition according to sample 1 was adjusted, the silicon content was in a controllable range, so that ferrosilicon powder was directly added at 10ppm free oxygen for deoxidation.
1ppm of oxygen in the steel can be removed every 0.016kg of ferrosilicon powder per ton of steel; the amount of ferrosilicon added in this step g4=0.016 (kg/ton of steel) × (w [ O ] -10 ppm).
S8: continuing alloying according to the result of LF sampling 2; it should be noted that, the alloying manner is similar to the related art, and will not be described herein. In the step S8, the silicon loss is considered in the step S4 argon blowing and power transmission time period, and the silicon can be allocated in place.
S9: the content of free oxygen in the outlet is controlled to be 10-15ppm.
S10: the subsequent calcium treatment and soft blowing can be carried out; the manner of the calcium treatment and the soft blowing is similar to that of the related art, and is not described herein.
Example 1
102kg of silicomanganese, 201kg of aluminum iron, 50kg of silicon iron and 504kg of lime are added in the 120tLF converter tapping of the shao steel.
LF to stop oxygen 40ppm, 19kg of aluminum particles are added.
The exposed diameter of the molten steel is 30cm, the power is applied for 5min at 1 gear, then the power is applied for 5min at 4 gear, 503kg of synthetic slag, 144kg of fluorite balls and 505kg of lime are added in the process. 23kg of ferrosilicon powder was added first according to argon station w (Si) =0.008%. And then adding 64kg of ferrosilicon powder according to the silicon loss of 0.018 percent of the molten steel with the exposed diameter of 30cm for 10min and the silicon loss of 0.0028 percent when the power is applied for 5min from 1 gear to 4 gear. And (3) performing strong stirring for 1min at the power failure and with the exposed diameter of molten steel of 50cm, wherein the silicon loss is 0.003%, and 7kg of ferrosilicon powder is added. Sample 1, oxygen 16ppm, and ferrosilicon powder 2kg were added. Continuing to electrify for 6min at 4 th stage, wherein the exposed diameter of molten steel is 25cm, silicon of sample 1 component is 0.032%, ferrosilicon is added in 15kg, low manganese is added in 28kg, and meanwhile, according to the exposed diameter of molten steel of 25cm for 6min, silicon loss is 0.009%, silicon loss is 0.0039% at 4 th stage and electrifying for 6min, ferrosilicon is added in 21kg.
The power is cut off, the exposed diameter of molten steel is 50cm, the stirring is carried out for 2min, the silicon loss is 0.006%, and 14kg of ferrosilicon powder is added; sample 2, oxygen 12ppm, and 4kg of ferrosilicon powder (i.e. the total amount of ferrosilicon powder added after main heating is 2 times, 14kg at one time, and 4kg at the other time, and 18kg in total) were added. Sample 2 contained 0.044% silicon. And stopping oxygen at 10ppm. Feeding pure calcium wire for 150 m, soft blowing for 10min, and hanging for continuous casting and pouring.
The following table is example 1 and comparative example
In summary, the deoxidizing method of the low-carbon wiredrawing steel Q195LB of the invention comprises the steps of adding a few aluminum particles in batches for deoxidizing the slag surface according to the oxygen value and the optimized slag adding mode, and has the advantages of high deoxidizing speed, short time, good effect, low Als content and Al 2 O 3 Less inclusion. And in the early stage, the silicon content of the steel grade is controlled to be 0.018 according to the silicon content of the argon station sample and a target reference value, so that good deoxidizing effect and reasonable silicon content can be ensured. According to the argon blowing flow (the exposed diameter of molten steel), the power transmission time (the electric arc length), the supplement alloying of ferrosilicon powder for the silicon loss amount in steel, and the diffusion deoxidization of ferrosilicon powder according to the oxygen determination value and the stage oxygen control, the precise and reliable control of deoxidization is achieved, the problem of excessive or insufficient silicon usage caused by the excessively high or excessively low silicon addition amount is solved, the precise deoxidization is realized, and the high operability is realizedThe method comprises the steps of carrying out a first treatment on the surface of the The method of the invention can not cause carburetion of molten steel, and can solve the problems of poor deoxidation of molten steel and blockage of a continuous casting nozzle.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A deoxidizing method for low-carbon wiredrawing steel Q195LB, comprising:
s1: deoxidizing and alloying molten steel and slag washing the molten steel after tapping through a converter;
s2: sampling at an argon station;
s3: LF refining to stop oxygen determination, and adding slag surface deoxidizer according to oxygen value, wherein 0.016kg× (oxygen value-30 ppm)/ton of steel is added according to the oxygen value-30 ppm at the early stage, and no aluminum particle is added at the middle and later stages;
s4: 1) Adding ferrosilicon powder according to the silicon content of the argon station sample to carry out slag surface deoxidation;
2) According to the argon blowing flow and the power transmission time, adding ferrosilicon powder corresponding to the silicon loss of the steel grade; wherein,,
total silicon loss w1=0.00006% x Ar (1 cm) x t1+0.00006% x Ar (2 cm) x t2+ … … +0.00006% x Ar (50 cm) x t50 when argon is blown, wherein Ar (1 cm) to Ar (50 cm) are different molten steel exposure diameters, and t1 to t50 are different molten steel exposure diameters for argon blowing time min;
total silicon loss w2=0.00275% +0.0005% × (K1 gear-5) +0.00055% ×k2 gear+0.0006% ×k3 gear+0.00065% ×k4 gear+0.0007% ×k5 gear+0.00075% ×k6 gear+0.0008% ×k7 gear+0.00085% ×k8 gear+0.0009% ×k9 gear+ 0.00095% ×k10 gear+0.001% ×k11 gear, wherein K1 gear to K11 are slag melting time min of 1 to 11 gear voltage, and K1 gear +.5min; the total silicon loss W=W1+W2 caused by the argon blowing flow and the power transmission time; the total amount of ferrosilicon powder to be added corresponding to the total amount of silicon loss is G2=W/0.01%. Times.0.19, and 0.19 kg/ton of steel is 0.01% of the amount of ferrosilicon powder to be added per loss of silicon;
s5: oxygen is fixed in LF sampling 1, ferrosilicon powder is added for deoxidization according to the oxygen value w [ O ] -15 ppm;
s6: according to the result of LF sampling 1, when the silicon content is less than 0.04% of the technological card target value, continuously deoxidizing by adopting ferrosilicon powder;
s7: and (2) oxygen is fixed in LF sampling 2, and ferrosilicon powder is added for deoxidation according to the fixed oxygen value w [ O ] -10 ppm.
2. The deoxidizing method of low carbon wire drawing steel Q195LB as claimed in claim 1, wherein 1) the step of adding ferrosilicon powder to deoxidize the slag surface according to the silicon content of the argon station sample in step S4 specifically comprises:
the ferrosilicon powder is not added in the early stage when the silicon content w (Si) of the argon station sample is not less than 0.018%, the ferrosilicon powder is added according to the difference Deltaw (Si) of the silicon content when the silicon content w (Si) of the argon station sample is less than 0.018%, and the added ferrosilicon powder is in an amount G1= (0.018% -Deltaw (Si))/0.01%. Times.0.19 kg/ton steel.
3. The method for deoxidizing the low-carbon wire-drawn steel Q195LB according to claim 1, wherein in the step S1, the steps of deoxidizing alloying and slag washing are performed, comprising: adding 0.83-0.88 kg of silicomanganese per ton of steel, 1.66-2.1 kg of aluminum iron per ton of steel, 0.41-0.46 kg of ferrosilicon per ton of steel and 4.2-4.5 kg of lime per ton of steel into molten steel.
4. The deoxidizing method of low carbon wire drawing steel Q195LB according to claim 1, wherein in step S3, the proportioning and adding method of the slag surface deoxidizer comprises: adding 4.2-4.5 kg/ton of synthetic slag, 0.83-1.25 kg/ton of fluorite balls, 4.2-4.5 kg/ton of lime and aluminum particles in sequence in the electrifying process; wherein lime and aluminum particles are added in three batches equally, each batch of aluminum particles and lime are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton of steel, and the amount of each batch of aluminum particles is 0.016kg× (oxygen value-30 ppm)/3/ton of steel.
5. The method for deoxidizing the low-carbon wire-drawn steel Q195LB according to claim 4, wherein the Als content is controlled to be 0.002-0.007% after the slag-surface deoxidizer is added in the step S3.
6. The method for deoxidizing the low-carbon wire drawing steel Q195LB according to claim 1, wherein the added amount g3=0.016 kg of ferrosilicon powder per ton of steel x (w [ O ] -15 ppm) in step S5.
7. The deoxidizing method of low carbon wire drawing steel Q195LB according to claim 1, wherein in step S6, when the silicon content is not less than 0.04% of the target value of the process card, the amount of ferrosilicon is reduced or no ferrosilicon is added.
8. The method for deoxidizing the low-carbon wire drawing steel Q195LB according to claim 1, wherein the added amount g4=0.016 kg/ton of steel x (w [ O ] -10 ppm) in step S7.
9. The method for deoxidizing the low-carbon wire drawing steel Q195LB according to claim 1, wherein the method for deoxidizing the low-carbon wire drawing steel Q195LB further comprises, after step S7, step S8: continuing alloying according to the result of LF sampling 2;
s9: the content of free oxygen in the outlet is controlled to be 10-15ppm.
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