CN102962411B - Production method of low-carbon and medium-carbon steel - Google Patents
Production method of low-carbon and medium-carbon steel Download PDFInfo
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- CN102962411B CN102962411B CN201210472801.9A CN201210472801A CN102962411B CN 102962411 B CN102962411 B CN 102962411B CN 201210472801 A CN201210472801 A CN 201210472801A CN 102962411 B CN102962411 B CN 102962411B
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- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910000954 Medium-carbon steel Inorganic materials 0.000 title abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 174
- 239000010959 steel Substances 0.000 claims abstract description 174
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 57
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 54
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 32
- 229910052786 argon Inorganic materials 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 238000007664 blowing Methods 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000010079 rubber tapping Methods 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 23
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 23
- 239000001301 oxygen Substances 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 22
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 239000004411 aluminium Substances 0.000 claims description 37
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 abstract description 15
- 238000011282 treatment Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000009847 ladle furnace Methods 0.000 abstract description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 abstract 4
- 238000007599 discharging Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000003607 modifier Substances 0.000 abstract 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 description 9
- 238000005275 alloying Methods 0.000 description 7
- 239000010813 municipal solid waste Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 2
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000600 Ba alloy Inorganic materials 0.000 description 1
- 229910004762 CaSiO Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a production method of low-carbon and medium-carbon steel containing weight percentage composition of aluminum less than 0.01%. The method comprises the following steps of controlling sulfur content in molten iron to be less than 0.015 percent by weight; primarily refining the molten iron to form molten steel, and discharging the molten steel into a ladle; adding 1.5kg to 4.5kg of deoxidizing agent per ton steel with aluminum content being not greater than 2.0 percent by weight into the ladle according to the oxygen content of the molten steel at a primary refining terminal point during the process for tapping steel of 20 percent to 30 percent by weight; adding 1.0 to 3.5kg ladle slag modifier per ton steel into the ladle so as to control the sum of the ferric oxide (FneO) content and the manganese oxide (MnO) content to be less than or equal to 10 percent by weight in the process for tapping 80 to 90 percent by weight of steel; blowing argon to refine the molten steel; and adopting a continuous casting technique to pour the molten steel so as to acquire a casting blank. Due to the adoption of the method, the refining of a low-frequency (LF) ladle furnace is not needed, the calcium treatment is not needed, the castability of the molten steel is effectively improved, the water gapnozzle blockage phenomenon is alleviated, the turndish continuous casting furnace number of low-aluminum-content low-carbon and medium-carbon steel in the continuous casting process of low-aluminum-content medium-low carbon steel is more than 10, and a purpose of economical production can be realized.
Description
Technical field
The present invention relates to Ferrous Metallurgy and continuous casting technology field, more particularly, relate to a kind of middle low carbon steel that can improve and connect the method for watering stove number.
Background technology
In the prior art, adopt in the technical process of continuous casting process cast middle low carbon steel, due to the dystectic aluminium oxide (Al in molten steel
2o
3) be field trash and calcium silicates (CaSiO
3) etc. field trash easily stick on crystallizer submersed nozzle inwall, it is stopped up, for example, so cause the company of a tundish time to water stove number lower (, being less than 6 stoves), production cost increases, organization of production is subject to very big impact.Especially less (for example, section is not more than 40000mm to casting section
2) continuous casting billet time, because crystallizer submersed nozzle internal diameter is less, stop up more serious.
In order to overcome the problems referred to above, the modes such as available technology adopting calcium processing are to dystectic Al
2o
3be that field trash carries out degenerative treatments, make it change the Al of low melting point into
2o
3be field trash, thereby reach the object of improving pourability of molten steel.A kind of calcium treating method of excellent wire alloy steel for example, is disclosed in the Chinese invention patent that is CN102634638A at publication number, this invention adopts " converter smelting → LF refining → RH refining → billet continuous casting " production technology, when LF refining finishes, to molten steel feeding iron calcium line, silicon-calcium wire or solid calcium line, wire-feeding velocity 50～250m/min, the calcium aluminium mass percent of controlling in molten steel is (0.08～0.16), after soft blow, carry out again again RH processing, after finishing, RH processing carries out again fine particle calcium carbonate processing, to molten steel feeding iron calcium line, silicon-calcium wire or solid calcium line, wire-feeding velocity 50～250m/min, the calcium aluminium mass percent of controlling in molten steel is (0.04～0.08), then carry out soft blow, cast.The calcium treating method of this invention is produced high-quality steel, and field trash rank can not worsen, and pourability of molten steel is good, connects to water stove number and increase, and the calcium content of molten steel, compared with low and do not affect casting performance, makes field trash plastification simultaneously, improves the mechanical property of steel.This patent has been taked calcium treatment process improving aspect pourability of molten steel, but the method can cause the increase of steel-making cost.
Summary of the invention
For the deficiencies in the prior art, the invention provides the production method that a kind of aluminium weight percentage is less than 0.01% middle low carbon steel, described method can be improved the middle low carbon steel pourability of molten steel that aluminium weight percentage is less than 0.01%.More particularly, described method is particularly suitable for light section in employing (for example, strand cross sectional area is no more than 40000mm
2) the sour molten aluminium percentage composition of billet continuous casting technique casting while being less than 0.01% middle low carbon steel, improve pourability of molten steel.
The invention provides the production method that a kind of aluminium weight percentage is less than 0.01% middle low carbon steel, said method comprising the steps of: the sulfur content in molten iron is controlled at below 0.015wt%; Molten iron is carried out to just refining, to form molten steel, taps molten steel in ladle; In the process of tapping 20wt%～30wt%, the oxygen content during according to first refining terminal in molten steel adds aluminum content to be not more than deoxidier 1.5～4.5Kg/ ton steel of 2.0wt% in ladle; In the process of tapping 80wt%～90wt%, to the ladle dreg modifying agent that adds 1.0～3.5Kg/ ton steel in ladle, to control FeO and MnO content sum in ladle slag, be no more than 10wt%, preferably controlling FeO and MnO content sum in ladle slag is 4～8wt%; Molten steel is carried out to ar blowing refining; Adopt continuous casting process carry out pouring molten steel and obtain strand.
Aluminium weight percentage according to the present invention is less than an embodiment of 0.01% middle low carbon steel production method, the described step that molten steel is carried out to ar blowing refining can also comprise the aluminum steel that is not more than 1.2Kg/ ton steel to feeding in molten steel, take that to regulate the oxygen content scope in molten steel be 0.002～0.006wt%.
Aluminium weight percentage according to the present invention is less than an embodiment of 0.01% middle low carbon steel production method, described deoxidier can be calsibar alloy, described calsibar alloy can be by the calcium of 10wt%～20wt%, the barium of the silicon of 60wt%～70wt%, 10wt%～20wt% and the aluminium of 0～2.0wt% form.
Aluminium weight percentage according to the present invention is less than an embodiment of 0.01% middle low carbon steel production method, and the composition of described ladle dreg modifying agent can contain CaO>=55wt%, Al
2o
3≤ 5wt%, MgO:5～12wt%, CaF
2>=3wt%, and the gas forming amount>=90L/Kg of described ladle dreg modifying agent.
Aluminium weight percentage according to the present invention is less than an embodiment of 0.01% middle low carbon steel production method, described Argon intensity of molten steel being carried out to the step of ar blowing refining can be 0.8～1.5NL/ (ton steel minute), and argon blowing time can be 5～15 minutes.
Aluminium weight percentage according to the present invention is less than an embodiment of 0.01% middle low carbon steel production method, and the cross sectional area of the strand that cast forms according to said method is not more than 40000mm
2.The cross sectional area of the strand forming when casting is not more than 40000mm
2time, more than method of the present invention can be increased to 10 stoves by middle continuous cast crystallizer number.
Compared with prior art, the present invention is by adopting suitable deoxidization technique and crossing the methods such as program control aluminum dipping form formula, ladle slag modification, make that pourability of molten steel is effectively improved, continous casting sprue clogging is alleviated, and more than making middle continuous cast crystallizer number 10 stoves in low-aluminum-content middle low carbon steel casting process, reached the object of economical production.In addition, method of the present invention, without refining furnace refining, does not need calcium to process with regard to more than improving single middle continuous cast crystallizer number to 10 stove.In addition, method of the present invention is particularly suitable for solving strand cross sectional area and is not more than 40000mm
2continuous casting process process in nozzle blocking problem.
The specific embodiment
Below, in connection with exemplary embodiment, describe the present invention in detail.Should be noted, in this manual, related percentage all refers to percentage by weight, hereinafter will repeat no more.
The production method that aluminium weight percentage according to the present invention is less than 0.01% middle low carbon steel comprises the following steps: the sulfur content in molten iron is controlled at below 0.015%; Molten iron is carried out to just refining, to form molten steel, taps molten steel in ladle; In the process of tapping 20%～30%, the oxygen content during according to first refining terminal in molten steel adds aluminum content to be not more than deoxidier 1.5～4.5Kg/ ton steel of 2.0% in ladle; In the process of tapping 80%～90%, in ladle, add the ladle dreg modifying agent of 1.0～3.5Kg/ ton steel to be no more than 10wt% with FeO and MnO content sum in control ladle slag; Molten steel is carried out to ar blowing refining; Adopt continuous casting process carry out pouring molten steel and obtain strand.
Wherein, in tapping 80%～90% process, to the ladle dreg modifying agent that adds 1.0～3.5Kg/ ton steel in ladle, be that ladle dreg modifying agent fusing in order to guarantee to add is good, so that ladle slag is carried out to effective modification.If ladle dreg modifying agent adds too early, itself and molten steel excessive response and lose the modifying function to ladle slag; If added evening, ladle dreg modifying agent fusing is bad, does not have the modifying function to ladle slag.The addition of ladle dreg modifying agent should be controlled according to the oxidisability of endpoint molten steel, if endpoint molten steel oxidisability is high, need to strengthen ladle dreg modifying agent addition; When endpoint molten steel oxidisability is low, reduce ladle dreg modifying agent addition; Controlling particularly target is that ladle slag oxidisability (FeO and MnO content sum) is no more than 10wt%.
In one exemplary embodiment of the present invention, the composition of described ladle dreg modifying agent contains CaO>=55%, Al
2o
3≤ 5%, MgO:5～12%, CaF
2>=3%, and the gas forming amount>=90L/Kg of described ladle dreg modifying agent.Ladle dreg modifying agent of the present invention also should be avoided foam overblow when ladle slag is carried out to modification.Particularly, ladle dreg modifying agent composition can suitably be adjusted according to concrete working condition, those skilled in the art should understand that, for different smelting conditions and technical merit, just the Control for Oxygen Content of refining endpoint molten steel is different, under tapping process, the control of the quantity of slag is also different, so the composition of ladle dreg modifying agent can suitably be adjusted according to concrete working condition, its basic principle is to control ladle slag oxidisability in rational scope, if ladle slag oxidisability is too high, molten steel can continue to be oxidized in casting process; Ladle slag oxidisability is too low, in molten steel, aluminium content can be controlled too high and affect the castability of molten steel, therefore, need to control ladle slag oxidisability in rational scope, guarantee in ladle slag that FeO and MnO content sum are no more than 10wt%, preferably controlling FeO and MnO content sum in ladle slag is 4～8wt%.
In one exemplary embodiment of the present invention, the described step that molten steel is carried out to ar blowing refining can also comprise the aluminum steel that is not more than 1.2Kg/ ton steel to feeding in molten steel, take that to regulate the oxygen content scope in molten steel be 0.002～0.006%.When if the addition of aluminium is greater than 1.2Kg/ ton steel, thereby in molten steel, aluminium too high levels can cause pourability of molten steel deteriorated.In an example of the present invention, described aluminum steel adopts the aluminium solid wire of 0.2～0.25Kg/m.
In one exemplary embodiment of the present invention, described deoxidier can be calsibar alloy, and described calsibar alloy can be comprised of 10%～20% calcium, 60%～70% silicon, 10%～20% barium and 0～2.0% aluminium.Deoxidier of the present invention is not limited to this, it should be appreciated by those skilled in the art that the oxygen content scope of the desired just refining of the smelting process terminal for different steel grades is also different, so the addition of deoxidier and kind also can correspondingly be selected.For example, of the present invention containing the deoxidier of aluminium or for example, can not be Si-Ba alloy, Antaciron etc. containing the deoxidier of aluminium (, aluminium content is not more than 2% by weight percentage) substantially.
In one exemplary embodiment of the present invention, described Argon intensity of molten steel being carried out to the step of ar blowing refining can be 0.8～1.5NL/ (ton steel minute), and argon blowing time is 5～15 minutes.Here, Argon amount is too little, unfavorable to inclusion floating in molten steel, and Argon amount is excessive, easily causes molten steel oxidized.Argon blowing time is inadequate, and in molten steel, the clearance of deoxidation products is less, and argon blowing time is oversize, easily causes liquid steel temperature loss serious.
In one exemplary embodiment of the present invention, the cross sectional area of the strand that method casting of the present invention forms is not more than 40000mm
2.The cross sectional area of the strand forming when casting is not more than 40000mm
2time, more than method of the present invention can be increased to 10 stoves by middle continuous cast crystallizer number.
Specifically, method of the present invention can adopt following processing step to implement:
(1) molten iron pretreatment
By the modes such as molten iron pretreatment molten steel sulfur content is controlled at≤0.015%.
(2) converter is just refined
In converter, molten iron is carried out to just refining, then the molten steel after just refining is tapped in ladle.In tapping to appropriate not containing aluminium or substantially not containing the deoxidier of aluminium to adding in ladle according to converter terminal molten steel oxidation in 20～30% processes.Here, except Xiang Gangzhong adds deoxidier, can also to the requirement of molten steel component and/or for Optimizing Technical, add deoxidier to add alloy and carburant according to steel grade simultaneously.Here, adding the object of alloy and carburant is for molten steel component being adjusted to the scope that steel grade requires.Yet, the invention is not restricted to this, for example, for a person skilled in the art, for different steel grades, add the amount of alloy and the kind can be different; In addition, also can in ladle refining process, add the needed weight alloy of steel grades to regulate the alloying component in molten steel.Add carburant can regulate to a certain extent molten steel component and optimize to a certain extent subsequent technique process.The described deoxidier that does not substantially contain aluminium is preferably calsibar alloy, and described calsibar alloy can be by 10%～20% calcium, 60%～70% silicon, and 10%～20% barium and 0～2.0% aluminium form.
Add after deoxidier and alloy, tapping in 80%～90% process to the ladle dreg modifying agent that adds 1.0～3.5Kg/ ton steel in ladle.The composition of described ladle dreg modifying agent can contain CaO>=55%, Al
2o
3≤ 5%, MgO:5～12%, CaF
2>=3%, and the gas forming amount>=90L/Kg of described ladle dreg modifying agent.
(3) Argon after tapping
After having gone out steel, at Argon station, carry out ar blowing refining, deoxidation products is fully floated, improve Molten Steel Cleanliness.During molten steel ar blowing refining 5～10min, determine oxygen, according to the aluminum steel of determining oxygen data feeding 0～1.2Kg/ ton steel, control oxygen content in 0.002～0.006% scope.Total molten steel ar blowing refining time is 5～15min.
(4) continuous casting
During continuous casting, adopt well-known protective casting mode to protect molten steel, comprise collector nozzle of ladle cover protection tube, between collector nozzle of ladle and protection tube, blow hydrogen, in tundish, molten steel well covers, and adopts crystallizer submersed nozzle, uses crystallizer protecting residue.Preferably, also between collector nozzle of ladle and protection tube, use seal washer sealing.
Below in conjunction with example, exemplary embodiment of the present invention is further described.
Example 1
Adopt 120t converter smelting, the rear Argon of tapping, 200 * 200mm billet continuous casting flow process to produce Q195 steel, in this steel grade finished product, aluminium content [A1] is lower than 0.01% conventionally, and finished product [C] content is 0.07%～0.11%, adopts Si-Ca-Ba deoxidation.
The molten steel sulfur content that is blended into converter is 0.011%, converter smelting endpoint [C] content is 0.05%, in tapping, add the Si-Ca-Ba of 4.1Kg/ ton steel, as deoxidier, molten steel is carried out to deoxidation to approximately 25% time, and add the ferromanganese of 6.3Kg/ ton steel and the ferrosilicon of 0.8Kg/ ton steel to carry out molten steel alloying, tapping to approximately 85% time to the ladle dreg modifying agent that adds 3.0Kg/ ton steel in ladle.After having gone out steel, carry out ar blowing refining, Argon intensity 1.3NL/ (ton steel minute), Argon determine oxygen during to 8min, and oxygen activity 0.0083%, feeds aluminum steel 0.33Kg/ ton steel, and continuation Argon is determined oxygen, oxygen activity 0.0051% during to 10min.Total molten steel ar blowing refining time is 13min, and it is 1598 ℃ that Argon finishes rear liquid steel temperature.By ar blowing refining, deoxidation products is fully floated, improve Molten Steel Cleanliness, thereby obtain the molten steel of deoxidation alloying, its composition is: C:0.09%, Si:0.18%, Mn:0.48%, P:0.011%, S:0.011%, A1:0.004%, surplus is Fe and trace impurity.
After Argon processing, molten steel is sent to continuous casting and waters steel, and continuous casting adopts protection cast, and strand cross sectional dimensions is 200 * 200mm square billet, and this pourability of molten steel is good, and middle continuous cast crystallizer number is 10 stoves.
Example 2
Adopt the technological process of 120t converter smelting, the rear Argon of tapping, Φ 200mm round billet continuous casting to produce B steel, in this steel grade finished product, aluminium content [Al] is lower than 0.01% conventionally, and finished product [C] content is 0.17%～0.22%, adopts Si-Ca-Ba deoxidation.
The molten steel sulfur content that is blended into converter is 0.012%, converter smelting endpoint [C] content is 0.06%, in tapping, add the calsibar alloy of 3.2Kg/ ton steel, as deoxidier, molten steel is carried out to deoxidation to approximately 30% time, and add the carburant of the ferromanganese of 7.2Kg/ ton steel, the ferrosilicon of 1.1Kg/ ton steel and 1.4Kg/ ton steel to carry out molten steel alloying and carburetting, tapping to approximately 80% time to the ladle dreg modifying agent that adds 2.2Kg/ ton steel in ladle.After having gone out steel, carry out ar blowing refining, Argon intensity 1.1NL/ (ton steel minute), Argon determine oxygen during to 5min, and oxygen activity 0.0068%, feeds aluminum steel 0.16Kg/ ton steel, and continuation Argon is determined oxygen, oxygen activity 0.0047% during to 9min.Total molten steel ar blowing refining time is 11min, and it is 1583 ℃ that Argon finishes rear liquid steel temperature.By ar blowing refining, deoxidation products is fully floated, improve Molten Steel Cleanliness, thereby obtain the molten steel of deoxidation alloying, its composition is: C:0.19%, Si:0.24%, Mn:0.56%, P:0.008%, S:0.010%, A1:0.007%, surplus is Fe and trace impurity.
Argon is handled rear molten steel and is sent to continuous casting and waters steel, and continuous casting adopts protection cast, and strand cross sectional dimensions is Φ 200mm circle base, and this pourability of molten steel is good, and middle continuous cast crystallizer number is 12 stoves.
Example 3
Adopt the technological process of 120t converter smelting, the rear Argon of tapping, 200 * 200mm billet continuous casting to produce 45 steel, this steel grade finished product aluminium content [Al] is lower than 0.01% conventionally, and finished product [C] content is 0.42%～0.50%, adopts Si-Ca-Ba deoxidation.
The molten steel sulfur content that is blended into converter is 0.009%, converter smelting endpoint [C] content is 0.10%, in tapping, add the Si-Ca-Ba of 2.3Kg/ ton steel, as deoxidier, molten steel is carried out to deoxidation to approximately 30% time, and add the carburant of the ferrosilicon of 2.8Kg/ ton steel, the ferromanganese of 7.3Kg/ ton steel and 4.1Kg/ ton steel to carry out molten steel alloying and carburetting, tapping approximately 85% time to the ladle dreg modifying agent that adds 1.2Kg/ ton steel in ladle.After having gone out steel, carry out ar blowing refining, Argon intensity 1.0NL/ (ton steel minute), Argon is determined oxygen, oxygen activity 0.0038% during to 6min.Total molten steel ar blowing refining time is 10min, and it is 1563 ℃ that Argon finishes rear liquid steel temperature.By ar blowing refining, deoxidation products is fully floated, improve Molten Steel Cleanliness, thereby obtain the molten steel of deoxidation alloying, its composition is: C:0.45%, Si:0.26%, Mn:0.57%, P:0.013%, S:0.010%, A1:0.005%, surplus is Fe and trace impurity.
After Argon processing, molten steel is sent to continuous casting and waters steel, and continuous casting adopts protection cast, and strand cross sectional dimensions is 200 * 200mm square billet, and this pourability of molten steel is good, and middle continuous cast crystallizer number is 11 stoves.
For casting strand cross sectional area, be not more than 40000mm
2middle low carbon steel, it is crucial controlling [A1] content in molten steel.[A1] too high levels in molten steel easily produces Al in casting process
2o
3cause nozzle blocking; In molten steel, [A1] content is too low, can cause deoxidation of molten steel bad, affects steel quality.Method of the present invention, by adding ladle dreg modifying agent to carry out upgrading to ladle slag in tapping process, makes ladle slag can fully adsorb the Al producing in deoxidation process
2o
3be mingled with purifying of steel.Meanwhile, by controlling Oxygen Content in Liquid Steel in 0.002～0.006% scope, both guaranteed that deoxidation of molten steel was good, and also avoided because reoxidizing in the casting process that in molten steel, [A1] too high levels causes, thereby reduced nozzle blocking, realized economical production.
In sum, the present invention is by adopting the methods such as suitable deoxidization technique and excessively program control [A1] pattern, ladle slag modification, do not need the ladle furnace refining through LF, do not need to carry out calcium processing, and only need to carry out Argon and process and just make pourability of molten steel effectively be improved, nozzle blocking phenomenon is alleviated, and more than middle continuous cast crystallizer number 10 stoves in low-aluminum-content middle low carbon steel casting process, has reached the object of economical production.
Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that in the situation that do not depart from the spirit and scope that claim limits, can carry out various modifications and change to exemplary embodiment of the present invention.
Claims (8)
1. aluminium weight percentage is less than a production method for 0.01% middle low carbon steel, it is characterized in that, said method comprising the steps of:
Sulfur content in molten iron is controlled at below 0.015wt%;
Molten iron is carried out to just refining, to form molten steel, taps molten steel in ladle;
In the process of tapping 20wt%～30wt%, the oxygen content during according to first refining terminal in molten steel adds aluminum content to be not more than deoxidier 1.5～4.5Kg/ ton steel of 2.0wt% in ladle;
In the process of tapping 80wt%～90wt%, in ladle, add the ladle dreg modifying agent of 1.0～3.5Kg/ ton steel to be no more than 10wt% with FeO and MnO content sum in control ladle slag;
Molten steel is carried out to ar blowing refining;
Adopt continuous casting process carry out pouring molten steel and obtain strand.
2. aluminium weight percentage according to claim 1 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, in the process of tapping 80wt%～90wt%, to adding ladle dreg modifying agent take to control FeO and MnO content sum in ladle slag in ladle, be 4～8wt%.
3. aluminium weight percentage according to claim 1 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, the composition of described ladle dreg modifying agent contains CaO>=55wt%, Al
2o
3≤ 5wt%, MgO:5～12wt%, CaF
2>=3wt%, and the gas forming amount>=90L/Kg of described ladle dreg modifying agent.
4. aluminium weight percentage according to claim 1 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, the described step that molten steel is carried out to ar blowing refining also comprises the aluminum steel that is not more than 1.2Kg/ ton steel to feeding in molten steel, take that to regulate the oxygen content scope in molten steel be 0.002～0.006wt%.
5. aluminium weight percentage according to claim 1 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, described deoxidier is calsibar alloy, described calsibar alloy by the calcium of 10wt%～20wt%, the barium of the silicon of 60wt%～70wt%, 10wt%～20wt% and the aluminium of 0～2.0wt% form.
6. aluminium weight percentage according to claim 1 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, described Argon intensity of molten steel being carried out to the step of ar blowing refining is 0.8～1.5NL/ (ton steel minute), and argon blowing time is 5～15 minutes.
7. according to the aluminium weight percentage described in any one in claim 1 to 6, be less than the production method of 0.01% middle low carbon steel, it is characterized in that, the cross sectional area of described strand is not more than 40000mm
2.
8. aluminium weight percentage according to claim 7 is less than the production method of 0.01% middle low carbon steel, it is characterized in that, more than described production method can be increased to 10 stoves by middle continuous cast crystallizer number.
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| CN105499526A (en) * | 2014-09-25 | 2016-04-20 | 鞍钢股份有限公司 | Method for reducing total oxygen content of aluminum killed steel continuous casting head blank |
| CN107245544B (en) * | 2017-04-24 | 2020-09-29 | 鞍钢股份有限公司 | Rotary powder injection device for ladle slag modification and modification method |
| CN109913739A (en) * | 2019-03-19 | 2019-06-21 | 江阴华西钢铁有限公司 | The production technology of the high-quality Q195 continuous casting square billet of aircraft industry fastener |
| CN114395658A (en) * | 2022-03-02 | 2022-04-26 | 重庆钢铁股份有限公司 | Low-silicon hot coil Q195 molten steel castability control method |
| CN115401177B (en) * | 2022-08-02 | 2024-06-07 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding plug rod blockage |
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| JP3395706B2 (en) * | 1999-04-21 | 2003-04-14 | 住友金属工業株式会社 | Continuous casting method |
| WO2010015020A1 (en) * | 2008-08-04 | 2010-02-11 | Bluescope Steel Limited | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
| CN101956044A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团研究院有限公司 | Refining method for improving clean class of steel |
| CN102248142A (en) * | 2011-06-30 | 2011-11-23 | 攀钢集团有限公司 | Method for producing medium and low carbon aluminum killed steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3395706B2 (en) * | 1999-04-21 | 2003-04-14 | 住友金属工業株式会社 | Continuous casting method |
| WO2010015020A1 (en) * | 2008-08-04 | 2010-02-11 | Bluescope Steel Limited | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
| CN101956044A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团研究院有限公司 | Refining method for improving clean class of steel |
| CN102248142A (en) * | 2011-06-30 | 2011-11-23 | 攀钢集团有限公司 | Method for producing medium and low carbon aluminum killed steel |
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