CN105603156A - Production method for IF steel containing ultralow sulfur - Google Patents

Production method for IF steel containing ultralow sulfur Download PDF

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Publication number
CN105603156A
CN105603156A CN201610133702.6A CN201610133702A CN105603156A CN 105603156 A CN105603156 A CN 105603156A CN 201610133702 A CN201610133702 A CN 201610133702A CN 105603156 A CN105603156 A CN 105603156A
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steel
refining
slag
sulfur
content
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CN105603156B (en
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张敏
曾建华
龚洪君
冉孟伦
李扬州
杨森祥
杨晓东
李平凡
彭友全
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C21C7/10—Handling in a vacuum
    • 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

Abstract

The invention relates to a production method for IF steel containing ultralow sulfur and belongs to the technical field of ferrous metallurgy. According to the production method, by the adoption of the process of combining hot metal pretreatment desulfuration, converter desulfuration and LF refining and RH refining desulfuration, the desulfuration rate reaches 93% or above from hot metal pretreatment to LF refining, and by means of converter end point carbon, temperature and oxygen activity control, LF and RH process parameter control and other process technological measures, production of the IF steel containing ultralow carbon and ultralow sulfur is realized. Through comprehensive application of the method, production of the finished IF steel containing 0.002% or less of C and 0.004% or less of S is realized. The method is simple, easy to operate, low in production cost and suitable for mass production.

Description

The production method of super-low sulfur IF steel
Technical field
The production method that the present invention relates to super-low sulfur IF steel, belongs to technical field of ferrous metallurgy.
Background technology
IF steel, i.e. ultra-low-carbon steel, refers to the steel of [C]≤0.005%, product is widely used in the industry such as automobile making, pop can manufacture.In order to obtain good deep drawability, the control of the element such as C, S, N in the Ultra-low carbon steel to steel of high-quality requires high, rawThe difficulty of producing is very large, and at present producer such as domestic minority such as only Baosteel, Anshan iron and steel plant etc. can produce, and is difficult to meet domestic market demand, everyYear needs import in enormous quantities. Therefore develop low-sulfur ultralow-carbon IF steel under existing situation, improve enterprise survival ability andEnhance the competitiveness and there is important effect.
Application number is the smelting process that 201310136410.4 patent of invention discloses a kind of low-carbon (LC), ultralow-sulfur steel, by tappingTime add granule lime and fluorite; Gained molten steel carries out LF stove slag refining, completes slag making desulfurization, intensification and alloying.Finally obtain between carbon content 0.030%～0.040%, the mild steel of sulfur content≤0.0015%, the method gained steel is mild steel,In converter tapping and the deoxidation of employing alloy, because rear operation steel oxygen content in water is very low, ladle slag oxidisability is also very low, is conducive toCarry out the dark desulfurization of molten steel. Therefore, in fact, the desulfurization difficulty of mild steel is not high. And ultralow for carbon content≤0.002%Carbon steel, its molten steel oxygen activity is higher, and ladle slag oxidisability is also higher, very large for the stable control difficulty of process molten steel sulphur.Therefore, the method be not suitable for the production of super-low sulfur IF steel.
Application number is that 201010567336.8 patent of invention discloses taking off of a kind of desulfurization degree is high and desulfurized effect is stable mild steelSulphur method of refining, the method comprises taps the molten steel after converter smelting to ladle, in tapping process successively in ladleIn molten steel, add alloy and desulfurization refining slag to carry out molten steel alloying and desulfurization slag making, wherein, after having tapped, to shape in ladleIn the ladle slag becoming, add slag adjusting agent. The method can effectively remove the oxygen in molten steel, reduces the oxidisability of ladle slag, improves steelThe performance of cinder inclusion and composition, improve the desulfurization degree of molten steel greatly. But the method is proprietary for dexidized steel, and carbon content be 0.03～The dark sulfur removal technology of refining process of 0.08% mild steel, because carbon content is higher, its sulfur removal technology is compared with comparatively letter of ultra-low-carbon steelSingle.
Application number is that the patent of invention of 200610047101.X discloses a kind of deep desulfurizer for refining ultra-low-carbon steel and manufactureMethod, this desulfurizing agent composition comprises: CaO:60～69%, Al:11～20%, MgO:5～10%, SiO2：5～10％，Al2O3：1～5％，Fe2O3：0.5～1.2％，CaF2：1～3％，B2O3: 1～3%, BaO:1～3%, all the other areImpurity. This desulfurizing agent is mainly used in the dark desulfurization of ultra-low-carbon steel, and desulfurized effect is better, sees and S steel can be taken off and is less than from embodiment0.001%, but its complicated component, and from embodiment, this technology is applied on ultra-low-carbon steel and no doubt sulphur is taken off to lower waterFlat, but add before and after desulfurizing agent, carbon content of molten steel has been increased to 0.0024% by 0.0017%, and amplification is larger, is unfavorable for ultralowThe production of carbon steel.
Because the ultra-low-carbon steels such as IF will utilize [O] decarburization in steel in application of vacuum process, therefore such steel grade is in converter tapping mistakeSubstantially can deoxidation in journey, cause thus this steel grade molten steel [O] and ladle slag oxidisability higher, ladle slag does not have desulphurizing ability,Also can there is certain sulphur that returns in liquid steel refining process. Therefore metallargist both domestic and external adopts and finishes at vacuum decarburization, to vacuumThe method that chamber sprays into desulfurization powder is carried out the ultra-low-carbon steel of production super-low sulfur. As the application number patent of invention public affairs that are 201110211400.3Opened a kind of high-phosphorus low-sulfur non-oriented electrical steel and smelting process thereof, the method by after finishing in RH alloying to vacuum chamberAdd in batches the method for desulfurizing agent, realize the production of low-sulfur low-carbon steel steel. The method will extend vacuum processing time 5minAbove, have a strong impact on rhythm of production; To greatly increase STEELMAKING PRODUCTION cost adding of desulfurizing agent simultaneously, and cause product cost to increase.
Summary of the invention
The technical problem that the present invention solves is to provide the production method of super-low sulfur IF steel.
The production method of super-low sulfur IF steel of the present invention, comprises molten iron pretreatment, converter smelting, LF refining and RH refining successively,Wherein, in described converter smelting, add steel scrap, described steel scrap does not use slag steel, adopts the low-sulfur of sulfur content≤0.015% cleanSteel scrap; While smelting the sulfur content > 0.020% of the front one heat steel of super-low sulfur IF steel, do not spatter slag, whole slag is all outwelled;
When described LF refining, molten steel arrives processes position, adds active lime 3～5kg/t steel, argon bottom-blowing, and argon flow amount is500～1000NL/min, heat temperature raising stirs 10～20min, and making in slag FeO content is 7～12%, LF refining while finishing,Add containing aluminium slag adjusting agent 1～3kg/t steel, then at least 3min of soft blow argon;
When described RH refining, producing before IF steel, use the molten steel of sulfur content < 0.010%, carbon content < 0.05% to vacuum chamberCarry out prepurging; It is 530～800mm that RH refining starts Inserting Tube immersion depth; After RH refining finishes, add 1～2kg/t steelContaining aluminium slag adjusting agent, make the ladle slag oxidisability < 6% after residue adjustment.
Further, in LF refining and RH refining, the described aluminium slag adjusting agent that contains is made up of the component of following weight portion: Al2O3：20～40％，CaO：20～40％、Al：10～18％、MgO：5～10％，FeO＜3％，P＜0.10％，S＜0.15％，All the other are impurity.
Wherein, in described converter smelting, enter stove half steel and meet the following conditions: 1280 DEG C of temperature >, carbon content >=3.5%, sulphur containsAmount≤0.003%; When converter starts, add steel scrap, do not use carburant temperature raising;
Converter terminal residue adjustment method is: converter terminal is tapped after adding in stove 3～5kg/t steel dolomitic lime to process 2min, guaranteesLadle headroom 400～600mm; Finishing blowing is to the bottom blowing strong mixing 1～2min that taps, single brick flow 100Nm3/h；
The carbon content of controlling converter terminal is 0.04%～0.06%, sulfur content≤0.004%, and terminal oxygen activity is 0.05～0.08%,Finishing slag TFe content is 16～20%; Tapping process adds active lime 2～4kg/t steel, controls the quantity of slag under converter after tapping, makesLadle slag is thick≤100mm.
Further, RH decarburization initial oxygen and carbon meet following formula: [O] >=[C] × 4/3+150, in formula, [O] is initial oxygenContent, [C] is initial carbon content, the unit of [O] and [C] is ppm; When RH decarburization finishes, oxygen activity is 0.02～0.03%, carbonContent≤0.002%; The decarburization time that control vacuum is less than 3mbar is 15～18min.
Further, 1300 DEG C of the molten iron temperature > before described molten iron pretreatment, carbon content >=4.5%, sulfur content≤0.06%.
Further, in described super-low sulfur IF steel, sulfur content≤0.004%, carbon content≤0.002%.
Method of the present invention is different from the production method of traditional super-low sulfur ultra-low-carbon steel, is to adopt after molten iron and converter desulfurization essenceRefining process adopts correlation technique strictly to control ladle slag to return sulphur and molten steel and increase the technical measures of sulphur. The method has reduced RH desulfurizationOperation, has not only reduced production cost but also has saved the time.
The present invention is from flow process direct motion, reduce Ultra-low carbon, low-sulfur steel production cost, to environment and equipment harm is little and easy operating andLarge-scale production angle is set out, and has proposed a kind of super-low sulfur that molten iron pretreatment-converter-LF-RH refining desulfuration combines, ultralowCarbon IF steel production technology, can realize the steady production of finished product [S]≤0.004%, [C]≤0.002%, and RH finishes ladle slag oxygenVoltinism has obtained good control, is conducive to prevent casting process secondary oxidation of steel, improves Cleanliness of Molten Steel. In the methodTake full advantage of desulfurization, the control sulphur ability of molten iron pretreatment and converter and start to finish to RH refining from converter tapping, progressivelyLadle slag is carried out to modifying process, and the process of preventing is returned sulphur, but can significantly not reduce molten steel oxygen activity, in ensureing control sulphur,For the dark decarburization of RH provides necessary condition. This technical operation is simple, can not increase activity time, and cost is low simultaneously.
The technique that the inventive method combines with LF refining, RH refining desulfuration by employing molten iron pretreatment desulfurizing, converter desulfurization,Make molten iron pretreatment start to finish desulfurization degree to LF and reach more than 93%, and by converter terminal carbon, temperature, oxygen activity controlAnd the technology measure such as LF, the control of RH procedure parameter, without adding separately desulfurizing agent, realize super-low sulfur, super-low sulfurThe production of IF steel. By the integrated application of the inventive method, realize the super-low sulfur IF of finished product [C]≤0.002%, [S]≤0.004%Steel is produced. This method is simple, easy to operate, and production cost is low, is suitable for large production.
Detailed description of the invention
The production method of super-low sulfur IF steel of the present invention, comprises molten iron pretreatment, converter smelting, LF refining and RH refining successively,Wherein, in described converter smelting, add steel scrap, described steel scrap does not use slag steel, adopts the low-sulfur of sulfur content≤0.015% cleanSteel scrap; While smelting the sulfur content > 0.020% of the front one heat steel of IF steel, do not spatter slag, whole slag is all outwelled.
When described LF refining, molten steel arrives processes position, adds active lime 3～5kg/t steel, ladle bottom blowing argon gas, argon gas streamAmount is 500～1000NL/min, and heat temperature raising stirs 10～20min, and FeO in slag is controlled to 7～12%, LF refining knotShu Shi, adds the steel containing aluminium slag adjusting agent 1～3kg/t to the ladle top of the slag, and then at least 3min of soft blow argon, may be controlled to 5～7min,To ensure containing the fusing of aluminium slag adjusting agent evenly, spreading over ladle surface.
When described RH refining, in order to reduce sulphur and the carbon content in finished product, obtain the IF steel of low-sulfur, before production IF steel,Vacuum chamber is carried out to prepurging with the molten steel of [S] < 0.010%, [C] < 0.05%; RH refining start Inserting Tube immersion depth be 530～800mm, after RH refining finishes, adds 200～400kg containing aluminium slag adjusting agent to ladle surface, be incorporated as same contain with LFAluminium slag adjusting agent, makes the ladle slag oxidisability < 6% after residue adjustment.
The conventional slag adjusting agent in this area generally has 2 kinds at present, and a kind of is the common slag adjusting agent of metallic aluminium content < 10%; One isBe greater than 30% high alumina slag adjusting agent. Common slag adjusting agent is because aluminium content is low, residue adjustment weak effect, and consumption is large; And high alumina slag adjusting agentResidue adjustment effect is high, but because aluminium content is high, the aluminium when molten steel stirs in slag adjusting agent can react and cause steel with [O] in steelIn oxygen be removed, cause vacuum decarburization hypoxgia. For overcoming above-mentioned defect, the production method of super-low sulfur IF steel of the present invention,In LF refining and RH refining, slag adjusting agent used is made up of the component of following weight portion: Al2O3：20～40％，CaO：20～40%, Al:10～18%, MgO:5～10%, FeO < 3%, P < 0.10%, S < 0.15%, all the other are impurity.
Further, in described converter smelting, enter stove half steel and meet the following conditions: 1280 DEG C of temperature >, [C] >=3.5%, [S]≤ 0.003%; When converter starts, add steel scrap, do not use carburant temperature raising.
Converter terminal residue adjustment method is: converter terminal adds 3～5kg/t steel dolomitic lime and 1.5～2.5kg/t steel modification agent in stove,Dry slag is tapped after processing 2min, guarantees ladle headroom 400～600mm; Finishing blowing is to the bottom blowing strong mixing 1～2min that taps,Single brick flow 100Nm3/h。
Converter terminal control: [C] is 0.04%～0.06%, [S]≤0.004%, terminal oxygen activity 0.05～0.08%, finishing slag TFeBe 16～20%; Tapping process adds active lime 2～4kg/t steel, controls the quantity of slag under converter after tapping, make ladle slag thick≤100mm。
Dolomitic lime described in the present invention and active lime are the conventional auxiliary material in steelmaking process, and active lime mainly contains CaO,Its content is not less than 88wt%. Dolomitic lime is mainly containing CaO and MgO, and CaO mass fraction is 35～45%, MgO qualityMark is 35～55%.
Further, RH decarburization initial oxygen and carbon meet following formula: [O] >=[C] × 4/3+150, in formula, [O] is initial oxygenContent, [C] is initial carbon content, the unit of [O] and [C] is ppm; When RH decarburization finishes, oxygen activity is 0.02～0.03%, carbonContent≤0.002%; The decarburization time that control vacuum is less than 3mbar is 15～18min.
Wherein, when described RH refining, if decarburization initial oxygen and carbon content do not meet this formula, force decarburization, makeIt meets this formula. Described pressure decarbonization method can adopt the existing method in this area, also can adopt following methods: oxygen blow durationFor VCD starts (6～8) min, rifle position 440～480cm, flow is 2400～2800m3/ h, after oxygen blast, [O] meets above-mentionedRH enter the station [C], [O] concentration requirement, but for preventing Molten Steel over-oxidation, when oxygen blast, [O] presses lower limit and considers.
In the production method of super-low sulfur IF steel of the present invention, 1300 DEG C of the molten iron temperature > before described molten iron pretreatment, [C] >=4.5%,[S]≤0.06％；
In super-low sulfur IF steel of the present invention, [S]≤0.004%, [C]≤0.002%.
[S] in the present invention is sulfur content, and [C] is carbon content, and if no special instructions, the percentage sign in the present invention is quality percentageRatio.
In production process of the present invention, be strict carbon content, the carbon-free ladle of whole process using controlled.
Method of the present invention is different from the production method of traditional super-low sulfur ultra-low-carbon steel, is to adopt after molten iron and converter desulfurization essenceRefining process adopts correlation technique strictly to control ladle slag to return sulphur and molten steel and increase the technical measures of sulphur. The method has reduced RH desulfurizationOperation, has not only reduced production cost but also has saved the time.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention to instituteAmong the scope of embodiments of stating.
Embodiment 1
Adopt following methods production super-low sulfur IF steel.
(1) molten iron pretreatment
Molten iron before pretreatment meets the following conditions: 1300 DEG C of molten iron temperature >, C >=4.5%, S≤0.06%.
(2) converter smelting
Enter converter half steel condition: enter stove half steel carbon >=3.5%, 1280 DEG C of temperature >, S≤0.003%. 220～230 tons of charge weights.Steel scrap does not use slag steel, adopts the clean steel scrap of low-sulfur (S≤0.015%) amount≤8 ton. Do not use carburant temperature raising. BlewCheng Quancheng BOTTOM ARGON BLOWING. While smelting the last stove sulfur content of IF steel > 0.020%, do not spatter slag, whole slag is all outwelled. Specifically in table 1.
Table 1 converter enters fire bars part
Smelting number Steel grade Charge weight/t Temperature/DEG C Add steel scrap/t [C]/％ [S]/％
1 IF3 225 1285 0 3.52 0.0030
2 IF3 228 1287 3 3.63 0.0029
3 IF3 230 1290 6 3.55 0.0026
4 IF3 225 1292 2 3.58 0.0029
Converter terminal residue adjustment requires: converter terminal adds 3～5kg/t steel dolomitic lime and 1.5～2.5kg/t steel upgrading in stoveAgent dry slag is tapped after processing 2min, guarantees ladle headroom 400～600mm. Finishing blowing is to the bottom blowing strong mixing of tapping, and single brick flowsAmount 100Nm3/h, 1～2min. Specifically in table 2.
Table 2 converter terminal residue adjustment requirement
Converter terminal control: [C] is 0.04%～0.06%, [S]≤0.004%, terminal oxygen activity 0.05～0.08%, finishing slag TFeBe controlled at 16～20%. After tapping, in tank, slag upgrading requires: tapping process adds active lime 2-4kg/t steel, after tapping, controls and turnsThe quantity of slag under stove, make ladle slag thick≤100mm. Specifically in table 3.
Slag upgrading requirement in tank after the control of table 3 converter terminal and tapping
(3) LF refining
LF refining starts: molten steel arrives processes position, adds active lime 3～5kg/t steel. Ladle bottom blowing argon flow amount is controlled at 500～1000NL/min, heat temperature raising stirs 10～20min, and FeO in slag is controlled to 7～12%.
LF refining finishes: add molten steel slag adjusting agent 1～3kg/t steel to the ladle top of the slag, add rear soft blow argon >=3min, ensure slag adjusting agentFusing evenly, spreads over ladle surface.
Wherein slag adjusting agent main component is: Al2O3：20～40％，CaO：20～40％、MAl：10～18％、MgO：5～10%, FeO < 3%, P < 0.10%, S < 0.15%, all the other are impurity.
LF refining parameter corresponding to each Smelting number is in table 4.
Table 4LF process control
(4) RH refining
Produce before IF steel, use the high-temperature molten steel of [S] < 0.010%, [C] < 0.05% to carry out prepurging to vacuum chamber.
RH refining starts molten steel condition: Inserting Tube immersion depth is controlled between 530～800mm, starts application of vacuum, opensOpen vacuum main valve.
RH carbonization treatment: initial (the ppm) × 4/3+150 of [O] initial (ppm) >=[C]. If [O] initial (ppm) deficiency, carries outForce decarburization, control decarburization and finish a[O] 0.02～0.03%, decarburization target C :≤20ppm.
Vacuum is less than dark decarburization time (15～20) min of 3mbar.
RH refining residue adjustment: after RH refining finishes, add 200～400kg slag adjusting agent to ladle surface, add with LF refiningBe same slag adjusting agent, by the ladle slag oxidisability < 6% after residue adjustment.
LF refining parameter corresponding to each Smelting number is in table 5. Wherein, Smelting number 2 and 4 need to be forced decarburization.
Table 5RH process control
In whole steelmaking process, the control of sulfur content is in table 6.
Sulfur content control % in table 6 process steel
Molten iron pretreatment starts Converter enters stove Converter terminal LF departures RH departures Finished product
0.055 0.0024 0.0021 0.0019 0.002 0.0021
0.060 0.0028 0.0023 0.0023 0.0024 0.0024
0.051 0.0030 0.0043 0.0036 0.0038 0.0037
0.053 0.0026 0.0050 0.0046 0.0037 0.0036
From table 6, by effective control of converter smelting and LF, RH refining process, finished product sulfur content has obtained control effectivelySystem, has successfully realized the production of super-low sulfur, ultra low carbon IF steel.

Claims (6)

1. the production method of super-low sulfur IF steel, comprises molten iron pretreatment, converter smelting, LF refining and RH refining successively, itsBe characterised in that:
When described converter smelting, add steel scrap, described steel scrap adopts the clean steel scrap of the low-sulfur of sulfur content≤0.015%; Smelt ultralowWhen the sulfur content > 0.020% of one heat steel, do not spatter slag before sulphur IF steel, whole slag is all outwelled;
When described LF refining, molten steel arrives processes position, adds active lime 3～5kg/t steel, argon bottom-blowing, and argon flow amount is500～1000NL/min, heat temperature raising stirs 10～20min, and making in slag FeO content is 7～12%, LF refining while finishing,Add containing aluminium slag adjusting agent 1～3kg/t steel, then at least 3min of soft blow argon;
When described RH refining, producing before IF steel, use the molten steel of sulfur content < 0.010%, carbon content < 0.05% to vacuum chamberCarry out prepurging; It is 530～800mm that RH refining starts Inserting Tube immersion depth; After RH refining finishes, add 1～2kg/t steelContaining aluminium slag adjusting agent, make the ladle slag oxidisability < 6% after residue adjustment.
2. the production method of super-low sulfur IF steel according to claim 1, is characterized in that: in LF refining and RH refining,The described aluminium slag adjusting agent that contains is made up of the component of following weight portion: Al2O3：20～40％，CaO：20～40％、Al：10～18％、MgO:5～10%, FeO < 3%, P < 0.10%, S < 0.15%, all the other are impurity.
3. the production method of super-low sulfur IF steel according to claim 1 and 2, is characterized in that: in described converter smelting,Entering stove half steel meets the following conditions: 1280 DEG C of temperature >, carbon content >=3.5%, sulfur content≤0.003%; When converter starts, addEnter steel scrap, do not use carburant temperature raising;
Converter terminal residue adjustment method is: converter terminal is tapped after adding in stove 3～5kg/t steel dolomitic lime to process 2min, guaranteesLadle headroom 400～600mm; Finishing blowing is to the bottom blowing strong mixing 1～2min that taps, single brick flow 100Nm3/h；
The carbon content of controlling converter terminal is 0.04%～0.06%, sulfur content≤0.004%, and terminal oxygen activity is 0.05～0.08%,Finishing slag TFe content is 16～20%; Tapping process adds active lime 2～4kg/t steel, controls the quantity of slag under converter after tapping, makesLadle slag is thick≤100mm.
4. the production method of super-low sulfur IF steel according to claim 1, is characterized in that: RH decarburization initial oxygen and carbon are fullBe enough to lower formula: [O] >=[C] × 4/3+150, in formula, [O] is initial oxygen content, [C] is initial carbon content, [O's] and [C]Unit is ppm; When RH decarburization finishes, oxygen activity is 0.02～0.03%, carbon content≤0.002%; Control vacuum and be less than 3mbarDecarburization time be 15～18min.
5. according to the production method of the super-low sulfur IF steel described in claim 1～4 any one, it is characterized in that: described molten iron is pre-1300 DEG C of molten iron temperature > before treatment, carbon content >=4.5%, sulfur content≤0.06%.
6. according to the production method of the super-low sulfur IF steel described in claim 1～5 any one, it is characterized in that: described super-low sulfurIn IF steel, sulfur content≤0.004%, carbon content≤0.002%.
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CN106086594A (en) * 2016-07-28 2016-11-09 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of Ti IF steel
CN106148633A (en) * 2016-07-28 2016-11-23 攀钢集团攀枝花钢铁研究院有限公司 The stable control method of aluminum content in a kind of IF steel
CN106244762A (en) * 2016-07-28 2016-12-21 攀钢集团攀枝花钢铁研究院有限公司 A kind of control method of IF steel clamp foreign material
CN106244761A (en) * 2016-07-28 2016-12-21 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of high-cleanness, high IF steel
CN107686874A (en) * 2017-09-11 2018-02-13 攀钢集团攀枝花钢铁研究院有限公司 A kind of method for reducing ultra-low-carbon steel smelting process Als scaling loss
CN108611462A (en) * 2016-12-12 2018-10-02 上海梅山钢铁股份有限公司 A kind of control method of Ultra-low carbon steel inclusion
CN110747305A (en) * 2019-11-05 2020-02-04 山东钢铁集团日照有限公司 Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process
WO2020215688A1 (en) * 2019-04-23 2020-10-29 南京钢铁股份有限公司 Process for smelting ultra-low-carbon and ultra-low-sulfur steel
CN113584259A (en) * 2021-08-03 2021-11-02 攀钢集团西昌钢钒有限公司 Method for washing RH furnace

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CN106244762B (en) * 2016-07-28 2018-08-14 成都先进金属材料产业技术研究院有限公司 A kind of control method of IF steel clamps sundries
CN106244761B (en) * 2016-07-28 2018-11-16 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of high-cleanness, high IF steel
CN106244762A (en) * 2016-07-28 2016-12-21 攀钢集团攀枝花钢铁研究院有限公司 A kind of control method of IF steel clamp foreign material
CN106244761A (en) * 2016-07-28 2016-12-21 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of high-cleanness, high IF steel
CN106086594B (en) * 2016-07-28 2017-12-15 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of Ti IF steel
CN106148633B (en) * 2016-07-28 2018-12-25 成都先进金属材料产业技术研究院有限公司 The stable control method of aluminium content in a kind of IF steel
CN106148633A (en) * 2016-07-28 2016-11-23 攀钢集团攀枝花钢铁研究院有限公司 The stable control method of aluminum content in a kind of IF steel
CN106086594A (en) * 2016-07-28 2016-11-09 攀钢集团攀枝花钢铁研究院有限公司 A kind of preparation method of Ti IF steel
CN108611462A (en) * 2016-12-12 2018-10-02 上海梅山钢铁股份有限公司 A kind of control method of Ultra-low carbon steel inclusion
CN108611462B (en) * 2016-12-12 2020-03-27 上海梅山钢铁股份有限公司 Method for controlling inclusions in ultra-low carbon steel
CN107686874A (en) * 2017-09-11 2018-02-13 攀钢集团攀枝花钢铁研究院有限公司 A kind of method for reducing ultra-low-carbon steel smelting process Als scaling loss
WO2020215688A1 (en) * 2019-04-23 2020-10-29 南京钢铁股份有限公司 Process for smelting ultra-low-carbon and ultra-low-sulfur steel
CN110747305A (en) * 2019-11-05 2020-02-04 山东钢铁集团日照有限公司 Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process
CN110747305B (en) * 2019-11-05 2021-09-21 山东钢铁集团日照有限公司 Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process
CN113584259A (en) * 2021-08-03 2021-11-02 攀钢集团西昌钢钒有限公司 Method for washing RH furnace

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