CN116356111B - Aluminum-free killed steel refining treatment method for ladle argon gas port blockage - Google Patents
Aluminum-free killed steel refining treatment method for ladle argon gas port blockage Download PDFInfo
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 47
- 238000007670 refining Methods 0.000 title claims abstract description 45
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 181
- 239000010959 steel Substances 0.000 claims abstract description 181
- 239000002893 slag Substances 0.000 claims abstract description 87
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 47
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 43
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 42
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000011575 calcium Substances 0.000 claims abstract description 39
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 39
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 37
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 37
- 239000004571 lime Substances 0.000 claims abstract description 37
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000010436 fluorite Substances 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 27
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 16
- -1 aluminum calcium carbon Chemical compound 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 37
- 229910052717 sulfur Inorganic materials 0.000 claims description 35
- 239000011593 sulfur Substances 0.000 claims description 35
- 238000006477 desulfuration reaction Methods 0.000 claims description 22
- 230000023556 desulfurization Effects 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002436 steel type Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 claims 1
- 238000003672 processing method Methods 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000932 sedative agent Substances 0.000 abstract description 2
- 230000001624 sedative effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 5
- 238000005187 foaming Methods 0.000 description 5
- 239000006260 foam Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 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
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 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
- C21C7/0025—Adding carbon 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
- C21C7/0006—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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
Landscapes
- 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 an aluminum-free sedative steel refining treatment method for ladle argon gas port blockage, and belongs to the technical field of steel smelting. When the argon bottom blowing of the steel ladle is in a weak blowing state of 15-35 cubic meters per hour, the aluminum-free killed steel refining treatment method comprises the following steps: after the molten steel enters a station, carrying out molten steel carburetion according to the carbon content of the sample of the argon station; selecting small-gear potential power transmission, adding lime and fluorite into molten steel to control alkalinity after the power transmission is stable, adding silicon carbide and/or aluminum calcium carbon, shifting the gear power transmission, and adding aluminum particles until slag turns white; finally, feeding the calcium wire in a weak blowing state. According to the invention, the purposes of deoxidizing the aluminum-free killed steel without increasing the aluminum content in the state of weak argon blowing are realized by carbureting, adding aluminum-containing deoxidizing materials and calcium feeding treatment in molten steel, so that the refining of the aluminum-free killed steel is successfully completed, and the aluminum-free killed steel is smoothly pulled out in the later casting process.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to an aluminum-free sedated steel refining treatment method for ladle argon gas port blockage.
Background
When the LF furnace is used for treating molten steel, the bottom gas effect of the ladle is required, and if the bottom blowing argon does not reach the standard, the fluidity, the uniformity of components and temperature of the molten steel, the deoxidation and the desulfurization of the molten steel, the carburetion of the molten steel and the like are affected.
In reality, however, when the ladle bottom blowing does not reach the standard and has no better method for processing, for example, when the ladle is to be poured, the ladle needs to be turned over by a crown block for at least 30 minutes, and the production continuity can be seriously affected under the condition that the punctual operation is executed at present; or for example, the argon pipe at the bottom of the ladle is found to be leaked and needs repair welding or replacement, and maintenance personnel cannot run the operation at risk of life. The best approach is then to cope with this by the level of refining technology.
In view of this, it is necessary to provide a method of refining aluminum-free killed steel with argon gas port clogging of a ladle.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the aluminum-free sedative steel refining treatment method for the blockage of the argon gas port of the steel ladle.
The invention solves the technical problems by adopting the following technical scheme.
The invention provides an aluminum-free killed steel refining treatment method for ladle argon gas port blockage, which comprises the following steps of: after the molten steel enters a station, carrying out molten steel carburetion according to the carbon content of the sample of the argon station; selecting small-gear potential power transmission, adding lime and fluorite into molten steel to control alkalinity after the power transmission is stable, adding silicon carbide and/or aluminum calcium carbon, shifting the gear power transmission, and adding aluminum particles until slag turns white; finally, feeding the calcium wire in a weak blowing state.
The invention has the following beneficial effects:
The invention provides a refining treatment method of aluminum-free killed steel blocked by an argon gas port of a ladle, which mainly comprises the following steps: carburetion treatment after molten steel enters a station, diffusion deoxidization treatment by adding aluminum-containing deoxidizer and calcium feeding treatment in a weak blowing state. The carburetion operation can not only obtain the steel grade with the required carbon content, but also reduce the oxygen value of molten steel by combining carbon and oxygen, and reduce the consumption of the follow-up deoxidizer; then adding lime and fluorite into molten steel to control the alkalinity of the molten steel so as to facilitate the subsequent deoxidation treatment, and adding deoxidizers such as silicon carbide and/or aluminum calcium carbon, aluminum particles and the like to carry out diffusion deoxidation until slag on the surface of the molten steel appears white, thereby completing the deoxidation treatment; and finally, feeding a calcium wire in a weak blowing state to improve the calcium content of molten steel, and successfully realizing aluminum-free killed steel refining of the ladle bottom argon in the weak blowing state through the operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the relationship between the depth of insertion of an electrode into molten steel and the amount of carburetion per minute.
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 method for refining the aluminum-free killed steel with the blocked argon gas port of the steel ladle provided by the embodiment of the invention is specifically described below.
The embodiment of the invention provides an aluminum-free killed steel refining treatment method for ladle argon gas port blockage, which comprises the following steps of: after the molten steel enters a station, carrying out molten steel carburetion according to the carbon content of the sample of the argon station; selecting small-gear potential power transmission, adding lime and fluorite into molten steel to control alkalinity after the power transmission is stable, adding silicon carbide and/or aluminum calcium carbon, shifting the gear power transmission, and adding aluminum particles until slag turns white; finally, feeding the calcium wire in a weak blowing state.
After the molten steel enters the station, the ladle bottom blowing is found to be very small, and when the ladle bottom blowing does not reach the standard, the molten steel can not be pulled out from the production accident which is most likely to occur. The method adopted by the refining process is a multi-feeding calcium line, and if the method is used for aluminum-free killed steel, the problems of poor deoxidization, bubble in casting blank, uneven temperature and slow temperature rise of molten steel and uneven molten steel components are easily caused.
The inventor provides a refining treatment method of aluminum-free killed steel with a blocked ladle argon gas port through long-term practice, and the main steps of the treatment method are as follows: after the molten steel enters a station, the carburetion operation is directly carried out according to the carbon content of the sample of the argon station, the carburetion operation not only can obtain the steel grade with the required carbon content, but also can reduce the oxygen value of the molten steel by combining carbon and oxygen, and reduce the consumption of the subsequent deoxidizer; then adding lime and fluorite into the molten steel to control the alkalinity of the molten steel so as to facilitate the subsequent deoxidation treatment, adding deoxidizers such as silicon carbide and/or aluminum calcium carbon, aluminum particles and the like to carry out diffusion deoxidation, and finishing the deoxidation treatment when slag on the surface of the molten steel appears white; and finally, feeding a calcium wire in a weak blowing state to improve the calcium content of molten steel, and successfully realizing aluminum-free killed steel refining under the condition of weak blowing of argon at the bottom of the ladle.
In an alternative embodiment, the small gear power transmission range is 11-8 and the large gear power transmission range is 4-2. The small gear power transmission gear is 11-8, 9, 10 and 11, and the large gear power transmission gear is 4-2, 4, 3 and 2.
In an alternative embodiment, carbon powder is added into molten steel so that the carbon content in the molten steel is adjusted to be reduced by 0.01% -0.02% of the lower limit required by steel grade components;
Preferably, when carbon powder cannot be fused into molten steel for carburetion, the carburetion is carried out by adopting a foam electrode method, which comprises the following steps: stopping power transmission, aligning the bottoms of the three-phase electrodes in a manual lifting mode, and then inserting the three-phase electrodes into molten steel for 10-15 cm together without slag thickness;
Preferably, the electrode carburettes the molten steel at a rate of 0.008% to 0.01% carburetted per minute with a weak argon blow, based on 120-125 tons of molten steel.
In an alternative embodiment, the ratio of lime to fluorite is 400-500:150-200,
Preferably, the addition amount per minute is not more than 100 kg in terms of 120 tons of steel;
preferably, the time interval of the addition is 50-55s;
more preferably, the alkalinity of molten steel is controlled to be between 2.8 and 4 after lime and fluorite are added to the molten steel.
In an alternative embodiment, the addition amount of silicon carbide and/or aluminum calcium carbon is 50-80 kg/120 ton steel;
preferably, the on-site hand-throwing speed is 20-30 seconds, and 10-20 kg is added.
In an alternative embodiment, the amount of aluminum particles added is 4-8 kg/120 ton steel;
Preferably, the aluminum particles are added to the slag surface at a rate of 20-30 seconds/time.
When the deoxidizer such as silicon carbide and/or aluminum calcium carbon, aluminum particles and the like is used for diffusion deoxidization, the dosage of the deoxidizer needs to be strictly controlled, and because the embodiment of the invention is aluminum-free killed steel refining, the deoxidizer is an aluminum-containing material, and the purpose of diffusion deoxidization is achieved by controlling the dosage of the deoxidizer without increasing the content of aluminum element in molten steel. Specific: under the condition of small gear power transmission, silicon carbide and/or aluminum-calcium-carbon are/is generally added into molten steel in a site manual casting mode, the process is not easy to be too fast, a foaming agent in manual casting is made to foam together with slag in a ladle, gear power transmission is changed after the slag is added, aluminum particles float on the slag surface in site, and the purpose is that the aluminum particles react in the slag and do not enter the molten steel. After the aluminum particles are added for 2-4 minutes, bubbles in the slag can be reduced, the foaming degree of the slag can be reduced, but the viscosity of the slag can be increased along with the increase of aluminum oxide in the slag, and the deoxidization of molten steel is facilitated. The on-site slag adhesion is used for checking the color of slag, if the slag is white, the deoxidization is good, if the slag is black, gray and dark green, the deoxidization is bad, silicon carbide and/or aluminum-calcium-carbon are/is added in the power transmission process, the slag is foamed again, and aluminum particles are shoveled until the slag turns white.
In an alternative embodiment, the method further comprises: after the slag turns white, if the sulfur content in the molten steel exceeds the sulfur content required by steel type components, desulfurization treatment is required for the molten steel.
In an alternative embodiment, the desulfurizing treatment of molten steel includes the steps of: after the slag turns white, shifting down gear potential power transmission, and simultaneously supplementing fluorite and lime until the slag turns white glass slag, under the power transmission condition, when the temperature of molten steel is higher than 1545 ℃, calculating power transmission time according to the sulfur content of an argon station sample until sulfur is removed to a qualified range;
In an alternative embodiment, the supplemental mass ratio of lime to fluorite is from 100 to 125:38-50,
Preferably, the calculation method of the lime addition amount comprises the following steps: (argon station sulfur content-target sulfur content) ×1000/0.025%;
Preferably, the power transmission time calculation method includes: (argon station sulfur content-target sulfur content)/desulfurization rate, wherein the desulfurization rate is 0.0005% -0.0007% of desulfurization per minute.
Elemental sulfur is a detrimental element in steel, it easily generates FeS of low melting point, causes hot brittle cracks in steel during hot rolling and welding, and sulfur also easily forms sulfide inclusions in steel, reduces ductility and toughness of steel, particularly impact toughness, and when sulfur in steel is high, hydrogen Induced Cracking (HIC) corrosion resistance is greatly reduced, so that when the content of elemental sulfur in molten steel exceeds a target range, desulfurization treatment is required. Specific: after the earlier stage deoxidation treatment of the slag turning white, the power transmission is changed to a small gear, and fluorite and lime are added to improve the fluidity of the slag. Because the white slag begins to foam due to the strong viscosity after the large gear is changed back to the small gear, fluorite is added to adjust the slag until the slag becomes white glass slag, and the ratio of lime to fluorite is 100-125:38-50, preferably 2.5:1, the fluorite is added more, the steel ladle refractory is not good, but less fluorite is added, slag is thick, and the phenomenon that the molten steel cannot be pulled out in the later period easily occurs. Lime addition was (argon station sulfur-target sulfur) 1000/0.025%. Meanwhile, the power transmission process is calculated according to the desulfurization efficiency, and the power transmission is kept to remove sulfur to the qualified range.
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 keeping the molten steel in a weak blowing state for 5-8 minutes to complete the refining of the aluminum-free killed steel.
After the composition and temperature control of the molten steel are completed, the molten steel is subjected to calcium treatment, and a calcium line is fed to ensure that the calcium content of the molten steel is more than 0.0012 percent, and the molten steel is kept for 5 to 8 minutes in a weak blowing state. Because the calcium content of molten steel is low, the whole furnace steel can not be pulled out, the weak blowing time is short, and the molten steel can not be pulled out in the later casting period.
The features and capabilities of the present invention are described in further detail below with reference to examples.
The amount of slag added in the following examples and comparative examples was calculated on 120 tons of steel.
Example 1
Taking Q235B steel as an example, adding 500 kg of lime, 300 kg of bauxite and 800 kg of silicon-manganese alloy in the tapping process of a converter, sampling at an argon station after tapping, and transferring to an LF furnace. After molten steel reaches an LF furnace, argon is opened to the maximum, the temperature is measured to 1536 ℃, the condition that argon is only weakly blown to the bottom of a ladle is found (15-35 cubic meters per hour), the carbon content of an argon station sample is 0.07%, the required carbon content of steel types is 0.14% -0.16%, the oxygen content of the argon station sample is 27ppm, the sulfur content of the argon station sample is 0.016%, the target sulfur content is 0.01%, and the refining of aluminum-free killed steel comprises the following steps:
(1) After the molten steel enters a station, no slag is added, carbon powder is directly prepared according to an argon station sample, and the carbon powder is added into the molten steel so that the carbon content in the molten steel is adjusted to be 0.01% -0.02% of the lower limit of the steel type component requirement. That is, 85 kg of carbon powder (120 tons of molten steel can be carbureted by 0.01 percent per 15 kg of carbon powder) is added, if the carbon powder is not melted in the later period of refining and no carbon wire is carbureted in the spot during carbureting of the molten steel, the carbureting can be carried out by adopting a foam electrode method, the power is firstly cut off, then the bottom of a three-phase electrode is manually lifted and aligned, then the three-phase electrode is inserted into the molten steel for 10-15 cm together, the slag thickness is avoided, and the carbureting speed of the electrode for carbureting the molten steel is 0.008-0.01 percent per minute under the condition of weak argon blowing, wherein the relation between the depth of the electrode inserted into the molten steel and the carbureting amount per minute is shown in figure 1.
(2) 8 Grades of power are selected, 180 kg of fluorite and 450 kg of lime are added after the power transmission is stable, wherein fluorite is added in two batches, lime is added in 5 batches, the time interval is 55 seconds, the alkalinity of molten steel is controlled to be 2.5-3, slag is added at a speed of not more than 100 kg per minute, the time is 6.5-7 minutes, 4 grades of power transmission are changed after the slag is added, 40 kg of silicon carbide and/or aluminum-calcium-carbon are added on site, the hand feeding speed is 20-30 seconds, 10 kg of power is lost, 3 aluminum particles are then shoveled on the slag surface, the adding speed is 20-30 seconds each time, the aim is to enable the aluminum particles to react in the slag without entering molten steel, 2.5 minutes after the aluminum particles are added, the slag is stuck on site to see the color of the slag, the color of gray is indicated, the bad deoxidation is continuously added in the power transmission, the slag is foamed again, the aluminum particles are shoveled for 2 minutes, and the slag is seen again to be white after 2.5 minutes. This step takes 12 minutes to power on, sample one, and measure 1569 ℃.
(3) After the slag turns white, sampling one, looking at the sulfur content in the molten steel, and calculating the amount of the added lime according to the tested sulfur content-target sulfur content, wherein the tested sulfur content of the one sample is 0.015%, and the required added lime= (0.015% -0.010%). 1000/0.025% = 200 kg, and the ratio of the lime to fluorite is 2.5:1, the fluorite addition amount is 80 kg, 11-gear power transmission is changed, and the power transmission time is (0.015% -0.010%)/0.0007% = 7.1 minutes.
The other components are added normally, then the second sample is taken, the temperature is measured to 1577 ℃, the sulfur content of molten steel is 0.0097%, the carbon content is 0.141% in a qualified range, and the carbon and other elements are also in the qualified range. Can be used for soft blowing of the calcium wire.
And after the sample components are separated, if the sulfur content is beyond the steel grade range, continuously adding lime fluorite, and continuously transmitting power and stirring until the sulfur is qualified. If the carbon is still insufficient, the bubble electrode is carburised. And in the process of temperature control, operators can flexibly select gears according to the arrival temperature and the treatment time, so that the temperature is prevented from being lowered due to ultrahigh.
(4) 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 a calcium line is fed to make the calcium content of the molten steel be more than 0.0012%, and the molten steel is kept in a weak blowing state for 8 minutes.
In example 2, the same operation is adopted as in example 1, and only the operation of carbon distribution is changed to be carried out in a station, then, when the first sampling is carried out, the carbon in the molten steel is 0.075-0.085%, so that the carbon powder added is less stirred for 12 minutes until the end, and when the carbon in the molten steel is 0.11-0.12% before soft blowing, the time for needing a steel bubble electrode is long, and from the cost point of view, the electrode is 1.2 ten tons, the carbon powder is 2000 tons, and the carbon consumption is increased by 0.01% by using the electrode, and the cost is much higher than that of the carbon powder; in the prior deoxidization, the oxidation of silicon element is increased, because carbon powder is added in the prior stage, besides the carburetion of molten steel, the deoxidization and slag foaming promotion effects are also realized, and if the deoxidization of molten steel by carbon powder is less, the deoxidization amount of molten steel by aluminum is increased, or the consumption of silicon and other oxygen-related elements in the molten steel is increased through the power transmission process; from the effect of calcium treatment, if a lot of carbon powder is arranged on the surface of molten steel before the calcium wire is fed, the rolled molten steel can bring the carbon powder into a part during the calcium wire feeding, namely the accuracy of the previous carburetion can be affected, because the amount of carbon powder which can be turned into the molten steel is not known, and the quality of the molten steel can be affected, because calcium in the calcium wire can react with carbon to generate calcium carbide inclusion.
In example 3, the same operation as in example 1 was adopted, and only the speed of adding slag in the early stage was changed, for example, the slag was added at one time, or the slag was only divided into two batches, and then the slag could not be melted and agglomerated, and the alkalinity of the agglomerated slag was insufficient, because the agglomerated slag did not melt and the alkalinity of the slag could not be increased, and then, in the deoxidation process, the amount of silica or alumina in the slag was increased with the increase of the amount of deoxidizer added, and the alkalinity in the slag was decreased, and only glass slag was presented, and the white slag was impossible. The slag is not white and the desulfurization ability is reduced because the calcium oxide used for the desulfurization reaction in the slag is insufficient. On the other hand, the alkalinity in the slag is low, the capability of adsorbing molten steel inclusions is reduced, and accidents that continuous casting molten steel cannot be pulled out are caused.
Example 4 the same procedure as in example 1 was followed except that the amount of lime used in desulfurization or the proportion of fluorite was changed. Firstly, the addition amount of lime is insufficient, sulfur in molten steel is not removed, because argon is small, the desulfurization dynamic condition is not satisfied, and slag added only before is basically saturated, so that lime needs to be added in the limited time of molten steel treatment to promote the desulfurization reaction to continue. If the cost is not counted, a lot of lime is added, for example 600 kg of lime is added, slag thickness can appear, the fluidity of slag can be poor under the condition of constant argon flow, and the desulfurization power is insufficient, so that the maximum advantage of desulfurization dynamics is exerted as much as possible by adding as little slag as possible on the basis of meeting the quality requirement to control the proportion of the desulfurized lime to fluorite. Fluorite does not reduce the alkalinity of lime, can reduce the melting temperature of lime and improve the desulfurization reaction coefficient, but can not be added at will, if the addition is less, the desulfurization reaction coefficient naturally reduces, but if the addition is more, for example, lime is added by 200 kg and fluorite is added by 300 kg, slag becomes glass slag without viscosity, and the reaction of calcium oxide in slag and sulfur in steel also greatly reduces.
Example 5, the same operation as in example 1 was adopted, only the calcium treatment was changed, and if the calcium wire feed was low, the calcium in the molten steel was low, and the pulling-out was liable to be impossible, because the calcium in the molten steel could wash out the aluminum oxide and calcium sulfide stuck in the nozzle of continuous casting; if the calcium wire is fed more, the continuous casting stopper rod is corroded seriously, and the continuous casting heat is reduced, so that calcium in molten steel can wash off impurities and refractory materials, and the consumption of the refractory materials is increased.
Comparative example 1
Similar to the procedure of example 1, the only difference is that: the carbon powder addition amount is 30 kg, and the result is: the carbon content in the molten steel was 0.12%. Because if carbon is fully added in the earlier stage, the whole refining process is carburetted, and the probability that carbon powder completely enters molten steel is maximum. The early stage is less, meaning that the later stage is much more, but if the refining time or conditions are unchanged, the carburising time is much less, or much carburising time is wasted.
Comparative example 2
Similar to the procedure of example 1, the only difference is that: the addition amount of fluorite is 50 kg, the addition amount of lime is 200 kg, the alkalinity of molten steel is controlled to be 3, and the result is that: the sulfur content was also 0.014% due to the poor slag fluidity and the reduced desulfurization reaction coefficient.
Comparative example 3
Similar to the procedure of example 1, the only difference is that: silicon carbide and/or aluminum calcium carbon 10 kg, the result is: the aluminum in the steel may exceed 0.004% and the sulfur in the molten steel may be ultra high. Because if less slag is added, foaming is insufficient, aluminum particles are easy to enter molten steel when the aluminum particles are shoveled, aluminum exists in the steel, the aluminum in the steel exceeds 0.004%, the molten steel can not be pulled out easily, 0.004% of aluminum is added to 120 tons of molten steel, and only 7 kg of aluminum particles are required to enter the molten steel completely. If the amount of slag is increased, the slag foaming is serious, on one hand, the safety is influenced, because the slag foaming is serious, the slag can be fully filled out of the steel ladle to burn out other equipment, and on the other hand, the steel-slag reaction is influenced, and because the volume of the slag is greatly increased, only the lower slag layer can react with molten steel, and the upper slag layer cannot participate in the reaction.
Comparative example 4
Similar to the procedure of example 1, the only difference is that: the addition amount of aluminum particles is 20 kg/time, and the result is that: aluminum in molten steel exceeds standard, but sulfur in the steel can be removed to below 0.010%, and as aluminum enters the molten steel, the distribution coefficient of desulfurization reaction can be improved, the desulfurization rate is improved, but the aluminum in the steel is high, so that the probability of the molten steel not being pulled out is greatly increased. If aluminum particles are not added at all, the situation that the molten steel cannot be pulled out is avoided, the theory is feasible, but the quality of the molten steel is poor, because argon is small, the oxygen content in the molten steel is reduced greatly, the speed of deoxidizing by silicon carbide and aluminum, calcium and carbon is reduced greatly, the molten steel is likely to come out in a limited treatment time, slag is not white, sulfur in the molten steel is not removed, and other quality defects such as bubbles, cracks and the like in a steel billet can be caused during continuous casting steel pulling. Even if white slag can be produced, the amount of work is increased considerably, for example 20 kg of aluminium particles, corresponding to 7 bags of aluminium in 10 kg of calcium aluminium carbon.
In summary, the embodiment of the invention provides a method for refining aluminum-free killed steel with a blocked ladle argon gas port, when argon gas blown from the bottom of a ladle is in a weak blowing state of 15-35 cubic meters per hour, the method for refining aluminum-free killed steel comprises the following steps: after the molten steel enters a station, carrying out molten steel carburetion according to the carbon content of the sample of the argon station; selecting small-gear potential power transmission, adding lime and fluorite into molten steel to control alkalinity after the power transmission is stable, adding silicon carbide and/or aluminum calcium carbon, shifting the gear power transmission, and adding aluminum particles until slag turns white; finally, feeding the calcium wire in a weak blowing state. The steel grade with the required carbon content can be obtained through the carburetion operation, and the oxygen value of molten steel can be reduced through carbon-oxygen combination, so that the consumption of a follow-up deoxidizer is reduced; then adding lime and fluorite into the molten steel to control the alkalinity of the molten steel so as to facilitate the subsequent deoxidation treatment, and adding silicon carbide and/or deoxidizers such as aluminum calcium carbon and aluminum particles to perform diffusion deoxidation until slag on the surface of the molten steel appears white, thereby finishing the deoxidation treatment; and finally, feeding a calcium wire in a weak blowing state to improve the calcium content of molten steel, and successfully realizing aluminum-free killed steel refining under the condition of weak blowing of argon at the bottom of the ladle. It can be seen that the scheme provided by the embodiment of the invention can achieve the purpose of refining the aluminum-free killed steel by using the aluminum-containing deoxidizer.
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 (17)
1. The aluminum-free killed steel refining treatment method for the argon gas port blockage of the steel ladle is characterized by comprising the following steps of: after the molten steel enters a station, carrying out molten steel carburetion according to the carbon content of the sample of the argon station, wherein the molten steel carburetion method comprises the following steps: adding carbon powder into molten steel to adjust the carbon content in the molten steel to be 0.01% -0.02% lower limit of steel grade component requirements; selecting small-gear potential power transmission, after the power transmission is stable, adding lime and fluorite into molten steel, controlling the alkalinity of the molten steel to be 2.8-4, adding silicon carbide and/or aluminum calcium carbon, shifting the gear power transmission, and adding aluminum particles until slag becomes white; finally, feeding the calcium wire in a weak blowing state.
2. The aluminum-free steel refining treatment method as recited in claim 1, wherein the small-gear power transmission range is 11-8, and the large-gear power transmission range is 4-2.
3. The method for refining aluminum-free killed steel according to claim 1, wherein when the molten steel is carbureted, and when carbon powder cannot be fused into the molten steel for carbureting, the carbureting is performed by a bubble electrode method, comprising: stopping power transmission, aligning the bottoms of the three-phase electrodes in a manual lifting mode, and then inserting the three-phase electrodes into molten steel for 10-15 cm together without slag thickness.
4. The method of refining aluminum-free killed steel according to claim 3, wherein the speed of carbureting the molten steel with the electrode is 0.008% -0.01% per minute, based on 120-125 tons of molten steel, under weak argon blowing.
5. The aluminum-free killed steel refining treatment method according to claim 1, wherein the addition mass ratio of the lime to the fluorite is 400-500:150-200.
6. The method for refining aluminum-free steel according to claim 5, wherein the amount of the aluminum-free steel added per minute is not more than 100 kg per 120 ton of steel.
7. The method for refining aluminum-free killed steel according to claim 6, wherein the time interval of addition is 50-55s.
8. The method for refining aluminum-free killed steel according to claim 1, wherein the addition amount of silicon carbide and/or aluminum-calcium-carbon is 50-80 kg/120 ton steel.
9. The method for refining aluminum-free killed steel according to claim 8, wherein the on-site hand casting speed is 20-30 seconds and 10-20 kg is added.
10. The method for refining aluminum-free steel according to claim 1, wherein the amount of aluminum particles added is 4-8 kg/120 ton of steel.
11. The method for refining aluminum-free steel according to claim 10, wherein the acceleration of the aluminum particles to the slag surface is 20 to 30 seconds/time.
12. The aluminum-free killed steel refining treatment method according to claim 1, further comprising: after the slag turns white, if the sulfur content in the molten steel exceeds the sulfur content required by steel type components, desulfurization treatment is required for the molten steel.
13. The aluminum-free killed steel refining treatment method according to claim 12, wherein the desulfurizing treatment of molten steel comprises the steps of: and after the slag turns white, shifting down gear potential power transmission, and simultaneously supplementing lime and fluorite until the slag turns white glass slag, under the power transmission condition, when the temperature of molten steel is higher than 1545 ℃, calculating power transmission time according to the sulfur content of an argon station sample until sulfur is removed to be within a qualified range.
14. The aluminum-free killed steel refining treatment method according to claim 13, wherein the additional mass ratio of the lime to the fluorite is 100-125:38-50.
15. The aluminum-free killed steel refining treatment method according to claim 14, wherein the calculation method of the lime addition amount is as follows: (argon station sulfur content-target sulfur content) 1000/0.025%.
16. The aluminum-free killed steel refining processing method according to claim 14, wherein the power transmission time calculating method is as follows: (argon station sulfur content-target sulfur content)/desulfurization rate, wherein the desulfurization rate is 0.0005% -0.0007% per minute.
17. The aluminum-free killed steel refining treatment method according to claim 14, further comprising: 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 keeping the molten steel in a weak blowing state for 5-8 minutes to complete the refining of the aluminum-free killed steel.
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| CN108251598A (en) * | 2018-01-12 | 2018-07-06 | 唐山钢铁集团有限责任公司 | A kind of carburetting control nitrogen production process of middle carbon high-alloy steel |
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