CN116536478A - Treatment method for preventing cold-heading steel from being pulled out - Google Patents
Treatment method for preventing cold-heading steel from being pulled out Download PDFInfo
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- CN116536478A CN116536478A CN202310359026.4A CN202310359026A CN116536478A CN 116536478 A CN116536478 A CN 116536478A CN 202310359026 A CN202310359026 A CN 202310359026A CN 116536478 A CN116536478 A CN 116536478A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 166
- 239000010959 steel Substances 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 131
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000002893 slag Substances 0.000 claims abstract description 123
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 238000007664 blowing Methods 0.000 claims abstract description 32
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 26
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 26
- 239000004571 lime Substances 0.000 claims abstract description 26
- 238000007670 refining Methods 0.000 claims abstract description 25
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011575 calcium Substances 0.000 claims abstract description 24
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 24
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000010436 fluorite Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 18
- -1 aluminum calcium carbon Chemical compound 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 64
- 229910052786 argon Inorganic materials 0.000 claims description 33
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 26
- 229910052717 sulfur Inorganic materials 0.000 claims description 23
- 239000011593 sulfur Substances 0.000 claims description 23
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000010273 cold forging Methods 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000002436 steel type Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 238000009749 continuous casting Methods 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000002308 calcification Effects 0.000 abstract description 4
- 238000004925 denaturation Methods 0.000 abstract description 4
- 230000036425 denaturation Effects 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/072—Treatment with gases
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a treatment method for preventing cold heading steel from being pulled out, and belongs to the technical field of steel smelting. Mainly comprises the following steps: after molten steel enters a station, small-gear potential power transmission is selected in the whole process, lime, fluorite, synthetic slag, aluminum slag and the like are added into the molten steel after power transmission is stable, the oxygen value of the molten steel can be reduced, slag with good adsorption capacity can be obtained by adding lime, fluorite, synthetic slag, aluminum slag and the like into the molten steel, and after the slag turns white, slag making is completed; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, aluminum particles and/or aluminum calcium carbon are added to the slag surface, and the aluminum oxide inclusion in the molten steel is adsorbed by continuing power transmission to increase the reaction interface of steel and slag, so that the content of aluminum oxide inclusion is reduced; and finally, feeding a calcium wire in a weak blowing state to perform calcification denaturation treatment on aluminum oxide inclusions in molten steel, and then improving the purity of the molten steel through soft blowing, reducing the aluminum oxide inclusions and meeting the castability requirement of continuous casting molten steel.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a treatment method for preventing cold heading steel from being pulled out.
Background
At present, cold heading steel is of a large number, taking SWRCH6A as an example, and belongs to low-carbon high-aluminum steel, and the composition is as follows: carbon 0.06% -0.08%, silicon 0-0.06%, manganese 0.2% -0.3%, phosphorus < 0.2%, sulfur < 0.12%, acid-soluble aluminum 0.025% -0.045%, in terms of 120 ton converter, the steel is required to be blown and drawn after final sample application in the smelting process of the converter, the carbon is controlled to be less than 0.06%, the oxygen content of molten steel can reach 800ppm-1200ppmm, aluminum is added for deoxidizing the steel, the aluminum adding amount is calculated according to 1 kg of oxygen removed by 3ppm, for example, 300 kg of aluminum is needed to be added when the final point oxygen is 900 ppm.
After the steel is discharged, the molten steel is transferred to an argon station for sampling and oxygen determination, and aluminum wire is fed and acid is matched for dissolving aluminum to 0.04 to 0.06 percent according to the oxygen value. Deoxidizing with aluminum wire to 1 meter for 1ppm, and adding 0.002% of the sample component to the range according to the acid-soluble aluminum content of the sample component. For example, 56ppm oxygen is fixed in an argon station, after sampling results, 0.007% acid-soluble aluminum in steel, and when the acid-soluble aluminum in steel is matched to 0.05%, the length of aluminum wires to be fed is 56×1+ (0.05% -0.007%) ×1000/0.2=56+215=271 meters.
After molten steel is transferred to an LF furnace, an aluminum wire is fed according to an argon station sample, acid-soluble aluminum is added to 0.06%, 200 kg of aluminum slag (containing 40%) is added, the process requires stirring for 3-5 minutes by using 100 cubic meters/hour of argon, sampling is carried out again, 0.04% -0.045% of the acid-soluble aluminum is added according to the sample, a 200-meter calcium wire is fed after refining is finished, and soft blowing is carried out for 15 minutes or more to realize station output.
Because the bottom blowing effect of each ladle is different, some ladles open the argon flow to the maximum, but the argon can only achieve the effect of weakly blowing argon. For the steel ladle which does not meet the standard requirements, if the ladle changing treatment is selected, the production and the quality of molten steel can be positively influenced, because the molten steel is contacted with air in the ladle reversing process, aluminum in the molten steel can be greatly oxidized, so that the aluminum oxide content is very high, the aluminum oxide is removed, and the fluidity of the molten steel is a difficult problem. Even if the ladle is not reversed, aluminum added into a converter and an argon station can form certain aluminum oxide in molten steel, and the aluminum oxide is difficult to remove under the condition that argon gas does not meet the requirement, and the phenomenon that the molten steel is not pulled out in continuous casting is very likely to happen if the argon gas is not noticed slightly.
In view of the above, it is necessary to provide a new treatment method for preventing cold heading steel from being pulled out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a treatment method for preventing cold-heading steel from being pulled out.
The invention solves the technical problems by adopting the following technical scheme.
The embodiment of the invention provides a treatment method for preventing cold heading steel from being pulled out, which comprises the following steps of: after molten steel enters a station, small-gear potential power transmission is selected, lime, fluorite, synthetic slag and aluminum slag are added into the molten steel after the power transmission is stable, so that white slag with good fluidity is produced; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, and aluminum particles and/or aluminum calcium carbon are added to adsorb aluminum oxide inclusion in the molten steel; and feeding the calcium wire in a weak blowing state, and then carrying out soft blowing for a period of time to finish refining.
The invention has the following beneficial effects:
the invention provides a treatment method for preventing cold heading steel from being pulled out, which comprises the following steps of: after molten steel enters a station, small-gear potential power transmission is selected in the whole process, lime, fluorite, synthetic slag, aluminum slag and the like are added into the molten steel after power transmission is stable, the oxygen value of the molten steel can be reduced, slag with good adsorption capacity can be obtained by adding lime, fluorite, synthetic slag, aluminum slag and the like into the molten steel, and after the slag turns white, slag making is completed; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, aluminum particles and/or aluminum calcium carbon are added to the slag surface, and the aluminum oxide inclusion in the molten steel is adsorbed by continuing power transmission to increase the reaction interface of steel and slag, so that the content of aluminum oxide inclusion is reduced; and finally, feeding a calcium wire in a weak blowing state to perform calcification denaturation treatment on aluminum oxide inclusions in molten steel, and then improving the purity of the molten steel through soft blowing, reducing the aluminum oxide inclusions and meeting the castability requirement of continuous casting molten steel.
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.
The following describes a treatment method for preventing cold heading steel from being pulled out.
In a first aspect, an embodiment of the present invention provides a method for preventing cold heading steel from being pulled out, when argon gas blown from the bottom of a ladle is in a weak blowing state of 15 to 35 cubic meters per hour, the method for preventing cold heading steel from being pulled out includes the following steps: after molten steel enters a station, small-gear potential power transmission is selected, lime, fluorite, synthetic slag and aluminum slag are added into the molten steel after the power transmission is stable, so that white slag with good fluidity is produced; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, and aluminum particles and/or aluminum calcium carbon are added to adsorb aluminum oxide inclusion in the molten steel; and feeding the calcium wire in a weak blowing state, and then carrying out soft blowing for a period of time to finish refining.
At present, under normal conditions, the molten steel treatment method is relatively mature, the phenomenon that molten steel cannot be pulled out can not occur according to the process operation, and the phenomenon can only occur when the steel ladle bottom blowing does not reach the standard.
When the ladle bottom blowing argon effect is only weak blowing or soft blowing argon, aluminum oxide in steel is difficult to remove, continuous casting steel is cast after refining, and pulling cannot be started when casting is started, so that the steel ladle bottom blowing cannot reach the standard on site, and under the condition that ladle pouring is not carried out or the subsequent molten steel is firstly connected with a casting machine for production, the cold pier steel can be treated under the condition of poor bottom blowing only by adopting a ladle (ladle) refining technology under the condition that the casting machine is downshifted, and the purpose that the molten steel can be smoothly cast is achieved.
Therefore, the embodiment of the invention provides a treatment method for preventing cold heading steel from being pulled out, which is used for refining the cold heading steel when argon is blown from the bottom of a steel ladle in a weak blowing state of 15-35 cubic meters per hour, and mainly comprises the following steps: after molten steel enters a station, small-gear potential power transmission is selected in the whole process, lime, fluorite, synthetic slag, aluminum slag and the like are added into the molten steel after power transmission is stable, the oxygen value of the molten steel can be reduced, slag with good adsorption capacity can be obtained by adding lime, fluorite, synthetic slag, aluminum slag and the like into the molten steel, and after the slag turns white, slag making is completed; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, aluminum particles and/or aluminum calcium carbon are added to the slag surface, and the aluminum oxide inclusion in the molten steel is adsorbed by continuing power transmission to increase the reaction interface of steel and slag, so that the content of aluminum oxide inclusion is reduced; and finally, feeding a calcium wire in a weak blowing state to perform calcification denaturation treatment on aluminum oxide inclusions in molten steel, and then improving the purity of the molten steel through soft blowing, reducing the aluminum oxide inclusions and meeting the castability requirement of continuous casting molten steel.
In an alternative embodiment, the small gear power transmission range is 11-8 gear, and more preferably 11 full range power transmission. After the slag is added, 11-8 power transmission is selected according to the temperature of molten steel and the production rhythm, and 11 power transmission is used in the whole process if the conditions are met, because argon is blown to the bottom of the ladle, the stirring effect is poor, at the moment, the best method for utilizing electrode power transmission to stir the slag at the top of the slag is to increase the flow of steel-slag, so that the slag can adsorb aluminum oxide in the molten steel, the maximum value of the stirring can be definitely increased in the whole process of power transmission, and therefore, when the temperature of the molten steel is controlled, the on-site personnel are required to calculate the heating capacity, and the gear is reasonably selected.
In an alternative embodiment, the slag charge is used in an amount of: 500 kg of lime/120 ton of steel, 400 kg of synthetic slag/120 ton of steel, 200 kg of fluorite/120 ton of steel, 200 kg of aluminum slag/120 ton of steel;
preferably, the fed-batch mode is as follows: 100 kg of synthetic slag and 20 kg of aluminum slag are added at a rate of one batch per minute until the synthetic slag is added, then 100 kg of lime and 20 kg of aluminum slag are added at a rate of one batch per minute until the lime is added, and finally fluorite and the rest of aluminum slag are added.
In an alternative embodiment, aluminum is formulated according to the acid-soluble aluminum of the first refining sample, wherein the aluminum formulation amount is based on the upper limit +0-0.005% of the acid-soluble aluminum in the cold forging steel.
In alternative embodiments, the aluminum particles are added in an amount of 20-30 kg/120 ton of steel, and/or the aluminum calcium carbon is added in an amount of 40-60 kg/120 ton of steel;
preferably, 4-6 kg of aluminum particles are shoveled in at a speed of every 40-60 seconds, and/or 10 kg of aluminum-calcium-carbon 2-3 bags are manually thrown in each bag. The electrode burns out aluminum in the slag, so that the formed aluminum oxide is dissolved in the slag, thereby improving the fluidity of the slag, increasing the reaction speed of steel and slag, and increasing the adsorption of the aluminum oxide in the steel. The aluminum particles are manually thrown without considering the acid-soluble aluminum in the steel, and even if the acid-soluble aluminum in the steel exceeds 0.05%, the aluminum particles are manually thrown. After the slag is added, the slag can be foamed, and aluminum is manually added into the slag, so that the foaming degree in the slag can be reduced while deoxidizing, and the slag is turned into white.
In an alternative embodiment, aluminum particles and/or aluminum calcium carbon are added to adsorb aluminum oxide inclusions in the molten steel so that the aluminum oxide inclusion content in the molten steel is less than or equal to 0.001%. Sampling and assaying to obtain the content of all aluminum and acid-soluble aluminum, wherein the method for calculating the inclusion content of aluminum oxide comprises the following steps: alt (all aluminum) -Als (acid soluble aluminum).
In an alternative embodiment, the method further comprises: after aluminum oxide inclusion in the molten steel is removed, if the sulfur content in the molten steel exceeds the sulfur content required by steel type components, desulfurization treatment is required to be carried out on the molten steel.
In an alternative embodiment, the desulfurizing treatment of molten steel includes the steps of: adding fluorite to improve the fluidity of the steel slag until the steel slag becomes white glass slag, and calculating the power transmission time according to the sulfur content of a refining sample-argon station sample when the temperature of molten steel is higher than 1550 ℃ under the power transmission condition until sulfur is removed to a qualified range;
in an alternative embodiment, the addition mass ratio of lime to fluorite is 90-100:50-60;
preferably, the calculation method of the lime addition amount comprises the following steps: (refined sample-argon station sulfur content-target sulfur content) 1000/0.025%;
preferably, the power transmission time calculation method includes: (refined sample argon station sulfur content-target sulfur content)/desulfurization rate, wherein the desulfurization rate is 0.0007% -0.0008% per minute.
In an alternative embodiment, the method further comprises: after the composition and temperature control of molten steel are completed, feeding a calcium line to ensure that the calcium content of the molten steel is more than 0.0012 percent, and then maintaining for 15 to 20 minutes in a weak blowing state with the argon flow of 5 to 15 cubic meters per hour to complete the refining of the cold heading steel.
The features and capabilities of the present invention are described in further detail below with reference to examples.
Example 1
Taking SWRCH6A steel as an example, after molten steel is fed into an LF furnace, argon is opened to the maximum, the temperature is measured to 1537 ℃, the condition that argon is only blown to the bottom of a ladle can reach the range of weak argon blowing (15-35 cubic meters per hour), the acid soluble aluminum content of an argon station sample is 0.009%, the oxygen content of the argon station sample is 110ppm, the sulfur content of the argon station sample is 0.020%, the target sulfur content is less than or equal to 0.012%, the feeding of an argon station into an aluminum wire is 110×1+ (0.05% -0.009%), 1000/0.2=110+205=325 meters, argon blowing is carried out for 3 minutes, and the steel is sampled out.
The refining of SWRCH6A steel comprises the following steps (the following feed rates are all 120 tons of steel):
1. after the molten steel enters a station, no slag is added, then 11 gears are used for power transmission, after the power transmission is stable, the slag is added, 500 kg of lime, 400 kg of synthetic slag, 200 kg of fluorite and 200 kg of aluminum slag are started, the feeding mode is as follows, 100 kg of synthetic slag and 20 kg of aluminum slag are added, the slag is added at a speed of adding one batch per minute until the synthetic slag is added, and then 100 kg of lime and 20 kg of aluminum slag are added until the lime is added, and then the fluorite and the aluminum slag are added. The on-site slag adhesion looks at the color of the slag, and if the slag is white, the slag shows good deoxidization, if the slag is dark green or black, the slag shows bad deoxidization, and aluminum particles are required to be added in power transmission until the slag turns white. In the case of glass slag, lime is added until a white opaque slag is obtained.
2. After slag charge is added, power transmission is continued for 2-3 minutes, sampling is carried out, the acid-soluble aluminum of a sample component is 0.038%, sulfur is 0.017% (during the process of treating molten steel in the prior stage of refining, the acid-soluble aluminum in the molten steel is changed by the size of argon, the oxygen content in slag or molten steel, the sulfur content in steel is also reduced by the influence of the deoxidization degree and the size of argon, so that the sulfur in the steel is certainly reduced by a few degrees after the operation is carried out), aluminum preparation is carried out according to the acid-soluble aluminum of the sample one, the aluminum preparation is carried out according to the acid-soluble aluminum of the refining sample, the aluminum preparation is carried out by feeding the aluminum wire for 50 meters, the aluminum preparation is carried out for 0.048%, and if the aluminum preparation is higher than 0.05%, the aluminum preparation is not needed. Since the molten steel is deoxidized in the early stage, if argon is small, aluminum in the steel is hardly oxidized, so that the control is only required according to the upper limit of the range.
3. After aluminum is prepared, 4-6 kg of aluminum particles are shoveled in the site at a speed of 40-60 seconds, and/or 10 kg of aluminum-calcium-carbon 2-3 bags are manually thrown into each bag. The step uses 11 grades of aluminum, calcium and carbon or aluminum particles to be added during power transmission, so that the deoxidizer is melted in slag, the slag is foamed in the process, the flow of the slag is promoted under the reaction force of bottom blowing and electrode slag pushing, aluminum oxide is adsorbed, and the power transmission process needs 10 minutes or more.
4. After the slag turns white, adding fluorite to improve the fluidity of the slag until the slag turns white glass slag, wherein the ratio of lime to fluorite is 90-100:50-60.
5. After white glass slag is manufactured, under the condition of 11-gear power transmission, when the temperature of molten steel is higher than 1550 ℃, the desulfurization speed is 0.0007-0.0008% per minute, and the power transmission time is calculated according to the sulfur content of an argon station sample until sulfur is removed to be within a qualified range. For example, from 0.017% to 0.012%, 0.005%/0.0007% = 7.14 minutes is required to remove (0.017% -0.012%) = 0.005%. Sampling two, acid-soluble aluminum of 0.042% of sample components, total aluminum of 0.043% and sulfur of 0.0118% and meeting the requirements.
6. After the above steps are completed and the composition and temperature of the molten steel are controlled, the molten steel is subjected to calcium treatment, and is fed with 180 m calcium wires to ensure that the calcium content of the molten steel is more than 0.0012 percent, and the molten steel is kept for more than 15 minutes in a soft blowing state. Taking a refining end sample, wherein the components are acid-soluble aluminum 0.040%, total aluminum 0.041%, sulfur 0.011%, calcium 0.015% and refining out.
Comparative example 1
Similar to the procedure of example 1, the only difference is that: the aluminum grain consumption is 45-60 kg/120 ton steel, and the result is: the acid-soluble aluminum in the refining outlet is 0.055 percent, which exceeds the component range, because a large amount of aluminum is added, a part of the aluminum certainly enters the molten steel to form the acid-soluble aluminum, the molten steel is deoxidized in the earlier stage, and the acid-soluble aluminum in the molten steel is difficult to oxidize. In addition, as the amount of aluminum added is increased, too high a content of aluminum oxide in the slag also affects the ability to adsorb inclusions because of calcium oxide: the larger the value of aluminum oxide, the stronger the adsorption capacity, but the stronger the flowability, the slower the adsorption rate. On the contrary, the fluidity is good, but the adsorption and inclusion capacity is poor. The site control is based on white slag, slag is slightly foamed, aluminum oxide in the slag is properly increased to be mainly, the adding amount of the first embodiment is 54% -60% of calcium oxide, 24% -31% of aluminum oxide, the adding amount of the first comparative embodiment is 60 kg of aluminum oxide, the aluminum oxide exceeds 33%, the slag is glassy, the viscosity is poor, and the adsorption capacity is not strong as that of the first embodiment.
Comparative example 2
Similar to the procedure of example 1, the only difference is that: the aluminum grain consumption is 5-10 kg/120 ton steel, and the result is: acid-soluble aluminum 0.039%, total aluminum 0.041%, aluminum oxide 0.002% in steel, increase the risk of steel water from being pulled out, if calcium is used to wash out aluminum oxide adhered to a continuous casting nozzle by calcium through increasing the calcium treatment capacity and feeding calcium wires, the corrosion of calcium in the steel water to the continuous casting nozzle is aggravated, especially when the calcium is more than 0.025%, thereby reducing the service life and the number of production furnaces. On the other hand, when a proper amount of aluminum is added to the slag to raise the slag-steel reaction interface, if the amount of aluminum is small, the slag is not sufficiently foamed, the fluidity is not sufficiently good, and the desulfurization of molten steel is also affected.
Comparative example 3
Similar to the procedure of example 1, the only difference is that: according to the refined sample acid-soluble aluminum, the content of the acid-soluble aluminum after aluminum preparation is 0.038%, and the result is that: the aluminum is 0.027% in the out-station acid-soluble aluminum, approaching the lower limit of the range, if the aluminum loss is a little bigger in the continuous casting and pouring process, namely the burning loss is more than 7.4%, the aluminum in the steel is less than 0.025%, and the composition is out of the range. In addition, the aluminum in the molten steel is low, the desulfurization rate is correspondingly reduced, the desulfurization is carried out for a longer time, the temperature and rhythm control are influenced, and the efficiency is not considered under the condition that the time is enough.
Comparative example 4
Similar to the procedure of example 1, the only difference is that: after the slag charge is added, slag is not stuck, slag is observed, the first sample is directly sampled, if the slag is black slag, aluminum is matched according to the first sample, aluminum oxide of molten steel can be very high, the later removal difficulty is increased, and the risk that the molten steel cannot be pulled out is increased.
Comparative example 5
Similar to the procedure of example 1, the only difference is that: and (3) after aluminum is matched according to the first sample, directly transmitting power in a large gear, and then, marking a calcium line. If the aluminum slag protection is not carried out continuously, aluminum oxide is removed through the steel-slag reaction, and the aluminum oxide can not be pulled out due to unclean removal.
In summary, the processing method for preventing cold-heading steel from being pulled out provided by the embodiment of the invention mainly comprises the following steps: after molten steel enters a station, small-gear potential power transmission is selected, lime, fluorite, synthetic slag and aluminum slag are added into the molten steel after the power transmission is stable, and after the slag turns white, slag formation is completed; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, aluminum particles and/or aluminum calcium carbon are added to the slag surface, and the aluminum oxide inclusion in the molten steel is adsorbed by continuing power transmission to increase the reaction interface of steel and slag, so that the content of aluminum oxide inclusion is reduced; and finally, feeding a calcium wire in a weak blowing state to perform calcification denaturation treatment on aluminum oxide inclusions in molten steel, and then improving the purity of the molten steel through soft blowing, reducing the aluminum oxide inclusions and meeting the castability requirement of continuous casting molten steel.
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 (10)
1. A treatment method for preventing cold heading steel from being pulled out is characterized in that when argon is blown into a ladle from bottom to be in a weak blowing state of 15-35 cubic meters per hour, the treatment method for preventing cold heading steel from being pulled out comprises the following steps: after molten steel enters a station, small-gear potential power transmission is selected, lime, fluorite, synthetic slag and aluminum slag are added into the molten steel after the power transmission is stable, so that white slag with good fluidity is produced; then aluminum is prepared according to the acid-soluble aluminum of the first refining sample, and aluminum particles and/or aluminum calcium carbon are added to adsorb aluminum oxide inclusion in the molten steel; and feeding the calcium wire in a weak blowing state, and then carrying out soft blowing for a period of time to finish refining.
2. A process according to claim 1, wherein the small gear power transmission is 11-8 gear, more preferably 11 full gear power transmission.
3. The method according to claim 1, wherein the slag is used in an amount of: 500 kg of lime/120 ton of steel, 400 kg of synthetic slag/120 ton of steel, 200 kg of fluorite/120 ton of steel, 200 kg of aluminum slag/120 ton of steel;
preferably, the fed-batch mode is as follows: 100 kg of synthetic slag and 20 kg of aluminum slag are added at a rate of one batch per minute until the synthetic slag is added, then 100 kg of lime and 20 kg of aluminum slag are added at a rate of one batch per minute until the lime is added, and finally fluorite and the rest of aluminum slag are added.
4. The method according to claim 1, wherein aluminum is prepared according to the acid-soluble aluminum of the first refining sample, the amount of aluminum being determined by +0-0.005% of the upper limit of the range of the acid-soluble aluminum in the cold forging steel.
5. The process according to claim 1, wherein the aluminium particles are added in an amount of 20-30 kg/120 ton of steel and/or the aluminium calcium carbon is added in an amount of 40-60 kg/120 ton of steel;
preferably, 4-6 kg of aluminum particles are shoveled in at a speed of every 40-60 seconds, and/or 10 kg of aluminum-calcium-carbon 2-3 bags are manually thrown in each bag.
6. A treatment method according to claim 5, wherein aluminum particles and/or aluminum-calcium-carbon adsorption of aluminum oxide inclusions in the molten steel are added so that the aluminum oxide inclusion content in the molten steel is not more than 0.001%.
7. The method of processing according to claim 6, further comprising: after aluminum oxide inclusion in the molten steel is removed, if the sulfur content in the molten steel exceeds the sulfur content required by steel type components, desulfurization treatment is required to be carried out on the molten steel.
8. The method of claim 7, wherein desulfurizing the molten steel comprises the steps of: lime and fluorite are added to improve the alkalinity of the steel slag, and good fluidity is maintained until the steel slag becomes white glass slag, and under the power transmission condition, when the temperature of molten steel is higher than 1550 ℃, the power transmission time is calculated according to the mono-sulfur content of a refined sample until sulfur is removed to be within a qualified range.
9. The method according to claim 8, wherein the addition mass ratio of the lime to the fluorite is 90-100:50-60;
preferably, the calculation method of the lime addition amount comprises the following steps: (refinery sample monosulfur content-target sulfur content) 1000/0.025%;
preferably, the power transmission time calculation method includes: (monosulfur content of refined sample-target sulfur content)/desulfurization rate, wherein the desulfurization rate is 0.0007% -0.0008% per minute of desulfurization.
10. The method according to claim 9, wherein after the composition and temperature control of the molten steel are completed, calcium lines are fed to make the calcium content of the molten steel greater than 0.0012%, and the molten steel is maintained in a soft blowing state at an argon flow rate of 5 to 15 cubic meters per hour for 15 to 20 minutes, thereby completing the refining of the cold heading steel.
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