CN107699654A - A kind of smelting process of ultra-low-carbon steel desulfurization rapidly - Google Patents
A kind of smelting process of ultra-low-carbon steel desulfurization rapidly Download PDFInfo
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- CN107699654A CN107699654A CN201710872249.5A CN201710872249A CN107699654A CN 107699654 A CN107699654 A CN 107699654A CN 201710872249 A CN201710872249 A CN 201710872249A CN 107699654 A CN107699654 A CN 107699654A
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or 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
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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
- C21C7/06—Deoxidising, e.g. killing
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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
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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
- C21C7/068—Decarburising
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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
- C21C7/10—Handling in a vacuum
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention is a kind of smelting process of ultra-low-carbon steel desulfurization rapidly,CAS positions clinker Calcium treatment → RH stoves vacuum decarburization → RH stoves alloying and vacuum outgas → RH processes after oxygen operation → Converter is stayed to use aluminium wire pre-deoxidation → LF refining furnace aluminium wire using molten iron ladle pouring → molten iron pretreatment → converter,Aluminum steel deoxidation,Lime slag making → CCM technological process,Skimmed by desulfurizing iron,Converter tapping stays oxygen system and slagging regime,CAS positions carry out Calcium treatment to clinker after Converter,RH stove vacuum decarburizations,Alloying,Degassing control,30~50Kg aluminium wires are added to carry out pre-deoxidation to the top of the slag before RH tappings,The aluminium wire diffusive deoxidation slag making of LF stoves and hello aluminum steel precipitation desoxydation, which are combined, carries out deep desulfurization,The whole rational ladle argon gas bottom blowing control of smelting process,Give full play to metallurgical thermodynamics and dynamic conditions,Make LF stoves contain the sulphur in molten steel in 30 minutes to take off within 0.0010%,The control of molten steel sulfur content is stable,Slab quality is good.
Description
Technical field
The invention belongs to a kind of process for making of field of metallurgy, specifically a kind of smelting of ultra-low-carbon steel desulfurization rapidly
Method.
Background technology
Sulphur can have undesirable effect to the performance of steel, and sulfur content is high in steel, and the hot-working character of steel can be made to degenerate, that is, caused
" hot-short " property of steel.With the development of science and technology, requirement of the society to ferrous materials also more and more higher, particularly hic resistance and anti-H2S
The exploitation of corrosion steel, sulfur content requirement is within 0.0010% in steel, the requirement of harsh sulfur content, conventional smelting desulfurization work
Skill can not fully meet large-scale production needs.
The content of the invention
It is an object of the invention to provide a kind of smelting process of ultra-low-carbon steel desulfurization rapidly, effectively solves in smelting process
Ultra-low-carbon steel slag beneficiation so as to influence the technical problem of desulfurization time, improves deoxidization desulfuration efficiency, realized in molten steel [S] by force
≤ 0.0010%.
Inventor is had found by studying, and due to the actual conditions of production, meets that continuous casting continuously pours the requirement of steel, LF stoves are necessary
The task of desulfurization and alloying is completed in 30min, but is that molten steel oxidation is strong the characteristics of ultra-low-carbon steel, using LF works after first RH
Sequence needs to stay oxygen to operate, and causes molten steel and too high oxygen level in clinker, and deaeration time is grown before desulfurization, and LF is difficult at the appointed time
Complete desulfurization and close evolving for task, therefore, the present invention is using desulfurization theory as analysis foundation, the production section of reasonably combined inter process
Play, clinker is modified, by verification experimental verification repeatedly, obtain the production technology of ultra-low-carbon steel desulfurization rapidly of the present invention.
The present invention realizes that the technical scheme of above goal of the invention is：
A kind of smelting process of ultra-low-carbon steel desulfurization rapidly, this method technological process include：It is pre- to adopt molten iron ladle pouring → molten iron
Processing → converter tapping stays after oxygen operation → Converter CAS positions clinker Calcium treatment → RH stoves vacuum decarburization → RH stoves alloying and true
Empty degassing → LF refining desulfurization → CCM；Wherein：
Converter tapping is stayed in oxygen operation, and tapping process adds 300~500Kg ferromanganese, using the weak deoxidation of aluminium block, taps to 1/3
When according to bessemerize terminal oxygen content i.e. sublance TSO oxygen contents value add aluminium block, the TSO oxygen contents unit be ppm, addition
After aluminium block, Control for Oxygen Content is Kg in 300~500ppm, aluminium block addition unit in molten steel, and aluminium block addition is specially：
As TSO oxygen contents >=1300ppm, often increase 100ppm oxygen increase aluminium block 10Kg；
After Converter in the clinker Calcium treatment of CAS positions, converter tapping terminates rear ladle and reaches CAS positions, steel ladle bottom argon blowing air-flow
Amount is controlled in 30~50Nl/min, feeds 100~150 meters of pure calcium lines by CAS stoves wire feeder, line feeding speed is 10~20m/
Min, wire feeder exit is using spiral guiding, it is ensured that silk thread feeds the top of the slag, the oxygen in effective place to go clinker, feeds after silk terminates
Molten steel is hung to RH stoves, carries out vacuum decarburization processing；
In RH stoves alloying and vacuum outgas, after RH stove vacuum decarburizations, required according to steel grades, add silicomangan and enter
Row alloying；Then RH stove Fruit storages are carried out, vacuum is not more than 300Pa, and the retention time is more than 15min, whole mistake
Journey argon bottom-blowing flow is controlled in 5~15Nl/min, and after application of vacuum terminates, argon bottom-blowing flow is adjusted to 30~50Nl/
Min, 30~50Kg aluminium wires are uniformly shed to the top of the slag, pre-deoxidation is carried out to clinker, waited driving to be hung to LF and carry out refining desulfuration.
So, the present invention stays CAS positions clinker after oxygen operation → Converter using molten iron ladle pouring → molten iron pretreatment → converter
Calcium treatment → RH stoves vacuum decarburization → RH stoves alloying and vacuum outgas → RH processes use aluminium wire pre-deoxidation → LF refining furnace aluminium
Silk, aluminum steel deoxidation, lime slag making → CCM technological processes, are skimmed, converter tapping stays oxygen system and slag making system by desulfurizing iron
Spend, CAS positions carry out Calcium treatment to clinker after Converter, and RH stoves vacuum decarburization, alloying, degassing control, RH taps preceding to the top of the slag
30~50Kg aluminium wires are added to carry out pre-deoxidation, it is deep de- that the aluminium wire diffusive deoxidation slag making of LF stoves and hello aluminum steel precipitation desoxydation are combined progress
Sulphur, the whole rational ladle argon gas bottom blowing control of smelting process, gives full play to the metallurgical thermodynamics and dynamic conditions of desulfurization, real
[S]≤0.0010% in existing molten steel.
The technical scheme that further limits of the present invention is：
In the smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein RH stoves vacuum decarburization, molten steel reaches the processing of RH stoves
After station, oxygen is determined in thermometric sampling, and temperature is more than 1590 DEG C of progress vacuum decarburizations, and when temperature≤1590 DEG C, molten steel returns LF stove liters
Temperature returns the processing of RH stoves again to more than 1620 DEG C, and as RH vacuums reduce by normal atmosphere (An), molten steel decarburization starts, and takes seriously
Reciprocal of duty cycle is reduced within 500Pa, and reaction between carbon and oxygen terminates, and is added 200~220Kg/ of aluminum shot stoves and is carried out deep deoxidation, is continued vacuum and is kept
2~3min, whole process argon bottom-blowing flow are controlled in 5~15Nl/min.
The smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein LF refining desulfurization include：
Early stage operates：After molten steel handles station to LF stoves, ladle bottom blowing 400~500Nl/min of flow is adjusted, slugging of powering
Lime 2.0~2.2kg/ tons steel, aluminium wire 0.2~0.3kg/ ton steel, sampling analysis, bottom electrode heating are added after 2~3min；
Mid-term operates：According to first steel sample ingredient of LF stoves and the sticky situation of slag condition, lime and aluminium wire slag making desulfurization are added,
Lime adding amount ton 1~1.5Kg of steel, aluminium wire addition 0.1~0.2kg/ ton steel, sweetening process control argon flow amount 300~
350Nl/min, aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel process control 20~30Nl/min of argon flow amount, aluminum steel feed quantity：
0.04~0.05% scope is maintained at aluminium content in smelting process molten steel to control aluminum steel feed quantity, according to target steel grade into
Divide and carry out alloying, heat up 6~8min sampling analyses, and bottom electrode continues the desulfurization that heats up；
Finishing operations：According to second steel sample ingredient of LF stoves and the sticky situation of slag condition, lime and aluminium wire slag making desulfurization are added,
Lime adding amount ton 1.0~1.2Kg of steel, aluminium wire 0.1~0.2kg/ ton steel, 300~350Nl/ of sweetening process control argon flow amount
Min, aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel process control 20~30Nl/min of argon flow amount, aluminum steel feed quantity：To smelt
Aluminium content is maintained at 0.04%~0.05% scope to control aluminum steel feed quantity in process molten steel, and it is micro- to add alloy progress alloying
Tune ensures that alloying component reaches steel grade target call；Bottom electrode continues the desulfurization that heats up, and sampling analysis, it is straight to repeat finishing operations flow
To meeting component requirements.
The smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein converter enter stove molten iron through desulfurization pretreatment and skimmed dry
Only, it is desirable to S mass percent [S]≤0.002%, control impurity in steel scrap, reduce converter tapping sulfur content, mitigate LF processes
Make the burden of desulfurization and the carburetting of strong reducing slag.
The smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein strictly control converter tapping process in the lower quantity of slag≤
2kg/t, prevent ladle top slag peroxidating.
The smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein control bessemerizes outlet temperature more than 1680 DEG C,
Terminal C mass percent [C]≤0.045%, tapping adds composite refining slag after 30 seconds and lime ladle top slag is changed
Matter, composite refining slag addition ton steel 5Kg, lime adding amount ton steel 3Kg, the component and its percentage by weight of composite refining slag
For：CaO 55%~65%, Al2O327%~37%, SiO2≤ 8.0%, H2O≤0.5%, N≤0.05%.
The smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein converter tapping process ladle bottom blowing gas flow are
200~300Nl/min, tapping time control is in 5-8min.
After the smelting process of foregoing ultra-low-carbon steel desulfurization rapidly, wherein LF stoves molten steel composition temperature are qualified, in order to protect
Demonstrate,prove inclusion modification to remove, pure 180~200m/ of calcium line stoves are fed in molten steel and carry out calcification processing, it is big that Calcium treatment terminates soft stirring
In 12min, soft whipping process argon bottom-blowing flow control is in 10~60Nl/min.
The beneficial effects of the invention are as follows：The present invention is skimmed by desulfurizing iron, and converter tapping stays oxygen system and slagging regime,
CAS positions carry out Calcium treatment to clinker after Converter, RH stoves vacuum decarburization, alloying, degassing control, add 30 to the top of the slag before RH tappings
~50Kg aluminium wires carry out pre-deoxidation, and the aluminium wire diffusive deoxidation slag making of LF stoves and hello aluminum steel precipitation desoxydation, which are combined, carries out deep desulfurization, smelting
The whole rational ladle argon gas bottom blowing control of refining process, give full play to the metallurgical thermodynamics and dynamic conditions of desulfurization, effectively solution
The strong unfavorable conditions of slag beneficiation caused by oxygen operation is stayed in converter of having determined, to stove under conditions of RH decarburizations, degassing is not influenceed
The continuous deoxidation of slag is modified, so as to shorten the LF slag making times, the LF white slag times by 15 minutes 5~8 minutes shortened till now,
The desulfurized alloy time reaches within controllable 30 minutes, stabilizes rhythm of production；After LF stove processing terminates, sulfur content in molten steel
It can control in [S]≤0.0010%., all iron content control is within 0.50% in slag.Experiment proves that using present invention side
Method, successfully solve the production problem of the ultra-low-carbon steel desulfurization rapidly of BOF → RH → LF techniques, produced for bulk industrial antiacid
Property pipe line steel provide technology ensure.
Brief description of the drawings
Fig. 1 is the smelting process flow chart of ultra-low-carbon steel desulfurization rapidly.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment.
The invention discloses a kind of smelting process of ultra-low-carbon steel desulfurization rapidly, uses：Molten iron ladle pouring → molten iron pretreatment
→ converter stay CAS positions clinker Calcium treatment → RH stoves vacuum decarburization → RH stoves alloying and vacuum outgas after oxygen operation → Converter →
RH processes are taken off using aluminium wire pre-deoxidation → LF refining furnace aluminium wire, aluminum steel deoxidation, lime slag making → CCM technological processes by molten iron
Sulphur is skimmed, and converter tapping stays oxygen system and slagging regime, and CAS positions carry out Calcium treatment to clinker after Converter, RH stoves vacuum decarburization,
Alloying, degassing control, RH tapping before to the top of the slag add 30~50Kg aluminium wires carry out pre-deoxidation, the aluminium wire diffusive deoxidation slag making of LF stoves and
Feed aluminum steel precipitation desoxydation and be combined the deep desulfurization of progress, the whole rational ladle argon gas bottom blowing control of smelting process, give full play to de-
The metallurgical thermodynamics and dynamic conditions of sulphur, realize in molten steel [S]≤0.0010%.
The smelting process flow of ultra-low-carbon steel desulfurization rapidly is as shown in Figure 1：
1st, converter smelting process：
(1) molten iron pretreatment operation.Entering stove molten iron through desulfurization pretreatment and must skim clean, it is desirable to [S]≤0.002%,
Impurity ([S]≤0.010% in steel scrap) in steel scrap is controlled, reduces converter tapping sulfur content, mitigates furnaceman's LF sequence and makes strong reducing slag
Desulfurization burden.
(2) pushing off the slag operates.The lower quantity of slag in strict control tapping process, the lower quantity of slag≤2kg/t is controlled, reduces converter tapping
Push up the difficulty of slag deoxidation.
(3) temperature and carbon content control.Blowing end point temperature is more than 1680 DEG C, terminal [C]≤0.045%.
(3) tapping slag making.Tapping process adds composite refining slag and lime ladle top slag is modified, composite refining slag
(composite refining slag ingredient：CaO 55%~65%, Al2O327%~37%, SiO2≤ 8.0%, H2O≤0.5%, N≤
0.05%) addition ton steel 5Kg, lime adding amount ton steel 3Kg.
(4) oxygen is stayed in tapping.Tapping process adds 300Kg ferromanganese, using the weak deoxidation of aluminium block, according to bessemerizing terminal oxygen content
(sublance TSO values) adds aluminium block.After adding aluminium block, steel oxygen content in water need to be controlled in 300~500ppm.Specific addition is seen below
Shown in table.
Slag material and aluminium block add the time：Tapping starts → tapped 30 seconds plus slag material → tapping to 1/3 plus aluminium block → and goes out
Steel terminates.
(5) steel ladle bottom argon blowing gas control system.Tapping process ladle bottom blowing gas flow is 200~300Nl/min, is tapped the time
Control is in 5-8min.
(6) ladle reaches CAS positions, and ladle bottom blowing argon flow amount is controlled in 30~50Nl/min, fed by CAS stoves wire feeder
Enter 100~150 meters of pure calcium lines, line feeding speed is 10~20m/min, feeds silk process and is fed using low speed, wire feeder exit is adopted
With spiral guiding, it is ensured that silk thread feeds the whole top of the slag, the oxygen in effective place to go clinker, feeds silk and terminates rear molten steel and is hung to RH stoves,
Carry out vacuum decarburization processing.
2nd, refining furnace smelting process：
(1) RH vacuum decarburizations are handled.After molten steel reaches RH stoves processing station, oxygen is determined in thermometric sampling, and temperature is more than 1590 DEG C
Carry out vacuum decarburization (when temperature≤1590 DEG C, molten steel need to return LF stoves be warming up to more than 1620 DEG C return again RH stoves handle), with
RH vacuums reduce by normal atmosphere (An), and molten steel decarburization (reaction between carbon and oxygen) starts, when vacuum is reduced within 500Pa,
Reaction between carbon and oxygen terminates (about 6~8min) substantially, adds aluminum shot 200Kg/ stoves and carries out deep deoxidation, continues vacuum and keeps 2min, according to
Steel grades requirement, add silicomanganese (addition by steel grades lower limit with addition of) alloy and carry out alloying.
(2) RH Fruit storages.Carry out Fruit storage after RH alloyings, vacuum is not more than 300Pa, during holding
Between be more than 15min, RH vacuum decarburizations, alloying, degassing whole process, the control of ladle bottom blowing argon flow amount in 5~15Nl/min,
Vacuum terminates ladle and opened to thermometric, sampling, feed location.
(3) after application of vacuum terminates, ladle is opened to feed location, and now the oxygen content in molten steel reaches minimum, in clinker
Oxygen is higher, can have diffusion phenomena, it is necessary to carry out micro- deoxidation treatment to the oxygen in clinker, argon bottom-blowing flow is adjusted to 30~
50Nl/min, 30~50Kg aluminium wires are uniformly shed to the top of the slag, pre-deoxidation is carried out to clinker, waited driving to be hung to LF and refine and take off
Sulphur.
(4) the LF stokeholds phase operates.After molten steel handles station to LF stoves, 400~500Nl/min of ladle bottom blowing flow is adjusted.
Lime 2kg/ tons steel, aluminium wire 0.2kg/ ton steel, sampling analysis, bottom electrode heating are added after 2~3min of power supply slugging.
(5) LF stoves mid-term operation (processing time 10min or so).According to first steel sample ingredient of LF stoves and the sticky feelings of slag condition
Condition, suitable lime and aluminium wire slag making desulfurization is added, lime adding amount ton steel is less than 2Kg, and aluminium wire is less than 0.2kg/ ton steel, desulfurization
Journey 300~350Nl/min of argon flow amount, aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel control 20~30Nl/min of argon flow amount,
Aluminum steel feed quantity：0.04~0.05% scope is maintained at aluminium content in smelting process molten steel to control aluminum steel feed quantity, according to
The composition of target steel grade carries out alloying, and heat up 6~8min sampling analyses, and bottom electrode continues the desulfurization that heats up.
(6) LF stoves finishing operations (processing time 25min or so).According to second steel sample ingredient of LF stoves and the sticky feelings of slag condition
Condition, suitable lime and aluminium wire slag making desulfurization is added, lime adding amount ton steel is less than 2Kg, and aluminium wire is less than 0.2kg/ ton steel, desulfurization
Journey 300~350Nl/min of argon flow amount, aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel control 30~60Nl/min of argon flow amount,
Aluminum steel feed quantity：0.04%~0.05% scope is maintained to control aluminum steel feed quantity with aluminium content in smelting process molten steel, added
Enter alloy and carry out alloying fine adjustment (ensuring that alloying component reaches steel grade target call)；Bottom electrode heating desulfurization, sampling analysis.Root
LF stove finishing operations flows are repeated according to analysis result.
(7) Calcium treatment and soft stirring.After molten steel composition temperature is qualified, in order to ensure that inclusion modification removes, in molten steel
Pure 180~200m/ of calcium line stoves are fed, Calcium treatment terminates soft stirring and is more than 12min, soft stirring Bottom Blowing Flow Rate Control：10~60Nl/
min。
Embodiment one
The present embodiment selects X60MS pipeline steel grades, smelts situation in 150 tons of converters, 150 tons of ladle furnaces.Its X60MS pipeline
Steel chemical composition is shown in Table 1, and whole smelting process control is as follows：
Table 1X60MS main chemicals (%)
(1) bessemerize.Blowing end point composition and temperature control are shown in Table 2.
The converter terminal composition (%) of table 2
(2) deoxidation slag making alloying after converter.Tapping process auxiliary material added order：Start tapping → lime, refining slag →
Composition Control is shown in Table 3 after aluminium block, addition and stove；100~150 meters of calcium lines are fed after ladle is opened to stove behind CAS positions, feed speed limit rate
10~20m/min, ensure that calcium line reacts in the top of the slag or slag interface.
Composition after the stove of table 3
(3) RH processing.RH leans on reaction between carbon and oxygen decarburization, adds aluminium deep deoxidation, and field trash is removed in preliminary alloying and vacuum outgas.Tool
Volume data is shown in Table 4, RH processing closure components table 5, and RH processing adjusts BOTTOM ARGON BLOWING controlled atmosphere flow to 30~50Nl/min after terminating,
Ensure that molten steel does not turn up, 30~50Kg aluminium wires are uniformly shed to the top of the slag.
Table 4RH arrives at a station temperature and alloying situation
Table 5RH closure components (%)
(4) refinement and deoxidation, slag making desulfurization, go to be mingled with technique.LF stove molten steel arrive at a station slugging → control argon bottom-blowing 300~
400Nl/min, heat temperature raising 3min → addition lime, aluminium wire, hello aluminum steel → heating → lime, aluminium wire, hello aluminum steel → control bottom
350~500Nl/min of blowing argon gas → alloying → heating → alloy fine setting → heating → feed aluminum steel adjusts aluminium → Calcium treatment → soft to stir
Mix, specific dosage is shown in Table 6, and refining treatment terminates slag specimen composition and is shown in Table 7, and refining furnace terminal composition is shown in Table 8.
The refining furnace of table 6 charging situation (kg)
The refining furnace of table 7 terminates slag composition (%)
The refining furnace endpoint molten steel Main Ingredients and Appearance (%) of table 8
(5) performance summary：
The technique carries out Calcium treatment to clinker by converter CAS stoves, and after RH stove vacuum terminates plus aluminium wire carries out clinker deoxidation
Technique, reaching LF refining before processing in molten steel effectively reduces clinker oxygen content, reduces LF super-low sulfur processing times, when LF is handled
Between foreshorten within 30min, the finishing slag color whiting after LF refining processing, all iron content control is within 0.3% in slag, clinker
With stronger reproducibility, using changing the desulfurization degree of smelting process more than 90%, and meet the more heats in scene and continuously pour
The requirement of casting.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domains of application claims.
Claims (8)
1. a kind of smelting process of ultra-low-carbon steel desulfurization rapidly, this method technological process include：Molten iron ladle pouring → molten iron is adopted in advance to locate
Reason → converter tapping stays CAS positions clinker Calcium treatment → RH stoves vacuum decarburization → RH stoves alloying and vacuum after oxygen operation → Converter
Degassing → LF refining desulfurization → CCM；It is characterized in that：
The converter tapping is stayed in oxygen operation, and tapping process adds 300Kg~500Kg ferromanganese, using the weak deoxidation of aluminium block, taps to 1/
According to terminal oxygen content i.e. sublance TSO oxygen contents value addition aluminium block is bessemerized when 3, the TSO oxygen contents unit is ppm, is added
After entering aluminium block, Control for Oxygen Content is Kg in 300~500ppm, aluminium block addition unit in molten steel, and aluminium block addition is specially：
As TSO oxygen contents >=1300ppm, often increase 100ppm oxygen increase aluminium block 10Kg；
After the Converter in the clinker Calcium treatment of CAS positions, converter tapping terminates rear ladle and reaches CAS positions, steel ladle bottom argon blowing air-flow
Amount is controlled in 30~50Nl/min, feeds 100~150 meters of pure calcium lines by CAS stoves wire feeder, line feeding speed is 10~20m/
Min, wire feeder exit is using spiral guiding, it is ensured that silk thread feeds the top of the slag, the oxygen in effective place to go clinker, feeds after silk terminates
Molten steel is hung to RH stoves, carries out vacuum decarburization processing；
In the RH stoves alloying and vacuum outgas, after RH stove vacuum decarburizations, required according to steel grades, add silicomangan and enter
Row alloying；Then RH stove Fruit storages are carried out, vacuum is not more than 300Pa, and the retention time is more than 15min, whole mistake
Journey argon bottom-blowing flow is controlled in 5~15Nl/min, and after application of vacuum terminates, argon bottom-blowing flow is adjusted to 30~50Nl/
Min, 30~50Kg aluminium wires are uniformly shed to the top of the slag, pre-deoxidation is carried out to clinker, waited driving to be hung to LF and carry out refining desulfuration.
2. the smelting process of ultra-low-carbon steel desulfurization rapidly according to claim 1, it is characterised in that：The RH stoves vacuum takes off
In carbon, after molten steel reaches RH stoves processing station, oxygen determine in thermometric sampling, and temperature is more than 1590 DEG C and carries out vacuum decarburizations, when temperature≤
At 1590 DEG C, molten steel time LF stoves are warming up to more than 1620 DEG C and return the processing of RH stoves again, as RH vacuums are by normal atmosphere (An)
Reduce, molten steel decarburization starts, and when vacuum is reduced within 500Pa, reaction between carbon and oxygen terminates, and adds aluminum shot 200~220Kg/ stoves
Deep deoxidation is carried out, continues vacuum and keeps 2~3min, whole process argon bottom-blowing flow is controlled in 5~15Nl/min.
3. the smelting process of ultra-low-carbon steel desulfurization rapidly according to claim 1, it is characterised in that：The LF refining desulfurization
Including：
Early stage operates：After molten steel handles station to LF stoves, ladle bottom blowing 400~500Nl/min of flow is adjusted, slugging 2 of powering~
Lime 2.0~2.2kg/ tons steel, aluminium wire 0.2~0.3kg/ ton steel, sampling analysis, bottom electrode heating are added after 3min；
Mid-term operates：According to first steel sample ingredient of LF stoves and the sticky situation of slag condition, lime and aluminium wire slag making desulfurization, lime are added
Addition ton 1~1.5Kg of steel, aluminium wire addition 0.1~0.2kg/ ton steel, 300~350Nl/ of sweetening process control argon flow amount
Min, aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel process control 20~30Nl/min of argon flow amount, aluminum steel feed quantity：To smelt
Aluminium content is maintained at 0.04~0.05% scope to control aluminum steel feed quantity in process molten steel, is carried out according to the composition of target steel grade
Alloying, heat up 6~8min sampling analyses, and bottom electrode continues the desulfurization that heats up；
Finishing operations：According to second steel sample ingredient of LF stoves and the sticky situation of slag condition, lime and aluminium wire slag making desulfurization, lime are added
Addition ton 1.0~1.2Kg of steel, aluminium wire 0.1~0.2kg/ ton steel, sweetening process control 300~350Nl/min of argon flow amount,
Aluminum steel adjustment molten steel aluminium content is fed, feeds aluminum steel process control 20~30Nl/min of argon flow amount, aluminum steel feed quantity：With smelting process
Aluminium content is maintained at 0.04%~0.05% scope to control aluminum steel feed quantity in molten steel, and it is true to add alloy progress alloying fine adjustment
Protect alloying component and reach steel grade target call；Bottom electrode continues the desulfurization that heats up, and sampling analysis, repeats finishing operations flow until full
Sufficient component requirements.
4. the smelting process of the ultra-low-carbon steel desulfurization rapidly according to any claim in claim 1-3, its feature exist
In：Converter enters stove molten iron through desulfurization pretreatment and skimmed clean, it is desirable to S mass percent [S]≤0.002%, controls steel scrap
Middle impurity, converter tapping sulfur content is reduced, mitigate the burden that LF processes make desulfurization and the carburetting of strong reducing slag.
5. the smelting process of the ultra-low-carbon steel desulfurization rapidly according to any claim in claim 1-3, its feature exist
In：The lower quantity of slag≤2kg/t in strict control converter tapping process, prevents ladle top slag peroxidating.
6. the smelting process of the ultra-low-carbon steel desulfurization rapidly according to any claim in claim 1-3, its feature exist
In：Control bessemerizes outlet temperature more than 1680 DEG C, terminal C mass percent [C]≤0.045%, and tapping adds after 30 seconds
Enter composite refining slag and lime ladle top slag is modified, composite refining slag addition ton steel 5Kg, lime adding amount ton steel
3Kg, the component and its percentage by weight of composite refining slag are：CaO 55%~65%, Al2O327%~37%, SiO2≤
8.0%th, H2O≤0.5%, N≤0.05%.
7. the smelting process of the ultra-low-carbon steel desulfurization rapidly according to any claim in claim 1-3, its feature exist
In：Converter tapping process ladle bottom blowing gas flow is 200~300Nl/min, and tapping time control is in 5-8min.
8. the smelting process of the ultra-low-carbon steel desulfurization rapidly according to any claim in claim 1-3, its feature exist
In：After LF stove molten steel compositions temperature is qualified, in order to ensure that inclusion modification removes, pure 180~200m/ of calcium line is fed in molten steel
Stove carries out calcification processing, and Calcium treatment terminates soft stirring and is more than 12min, and soft whipping process argon bottom-blowing flow controls 10~
60Nl/min。
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