CN108330241A - A kind of composite steel-smelting technique improving steel-making precision - Google Patents
A kind of composite steel-smelting technique improving steel-making precision Download PDFInfo
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- CN108330241A CN108330241A CN201810058194.9A CN201810058194A CN108330241A CN 108330241 A CN108330241 A CN 108330241A CN 201810058194 A CN201810058194 A CN 201810058194A CN 108330241 A CN108330241 A CN 108330241A
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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
- 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
- C21C5/30—Regulating or controlling the blowing
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- 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
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Abstract
The invention discloses a kind of composite steel-smelting techniques improving steel-making precision, are related to iron and steel smelting technology field, solve the problems, such as that molten steel composition is unstable, precision is low.It includes pneumatic steelmaking and the steel-making of LF stoves, the present invention by using permanent rifle position transformation offering oxygen way, be conducive to slag making and slugging, significantly improve the dynamic conditions of reaction in furnace, promote decarburization, dephosphorization, desulfurization, and ultrasonic wave is introduced when adding the first slag material, promote slag material and molten steel fast reaction, improves molten steel composition precision；Invention introduces ultrasonic waves, and argon flow amount can be reduced when adding slag material, reduce the dosage of argon gas, reduce steel-making cost；The present invention when adding slag material by introducing ultrasonic wave so that slag material is uniformly dispersed, and slag material is avoided to lump, and avoids remaining the impurity in slag material in molten steel.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more specifically, it relates to a kind of compound refining improving steel-making precision
Steel technique.
Background technology
Pneumatic steelmaking is that oxygen is blown into the pig iron of melting, makes the oxidations such as impurity silicon, manganese.It is released during oxidation
A large amount of heat (temperature of the pig iron can be made to increase 200 degrees Celsius containing 1% silicon), can make to reach sufficiently high temperature in stove.LF
Refining furnace is in addition to using more mature double refining skills such as the heating of reducing atmosphere submerged arc, vacuum outgas, the stirrings of air brick Argon
Outside art, refining with synthetic flux technology is also introduced, to reach desulfurization, the deoxidation even mesh of denitrogenation by rational slagging process
, to effectively absorb the field trash in steel, the form of field trash is controlled, being additionally formed by foamed slag using steel-making floods
No electric arc, improve the thermal efficiency, reduces refractory material and corrode.
A kind of LF stoves process for making is disclosed in the Chinese invention patent of Publication No. CN105714018A, including is walked as follows
Suddenly：Thermometric：Thermometric after entering the station has skull heating time to must not exceed 5 minutes, it is necessary to which thermometric, temperature measuring point argon gas stirring area are inserted into
Time 5-7 second, insertion depth 300-400mm, thermometric argon flow amount 200NL/min have a power failure after stirring 1min, stir argon flow amount
400-500NL/min；Power transmission heats：Voltage can be turned up after electric arc, electrode are stablized using deep low gear step voltage, electric current in the starting the arc
Shelf grade, the starting the arc use argon flow amount 100-200NL/min, heating to use argon flow amount 200-300NL/min；Slag making：Lime
600kg, modification agent 100kg, lime are added in two batches, and lime knot is avoided to cut or polish jade with an emery wheel, and heating 6min has a power failure, and argon gas is adjusted to 500-
600NL/min, strong mixing 1min, is stained with slag；Line feeding：Line feeding conduit ensures line vertically into molten steel away from top of the slag 500mm；Before line feeding
It must confirm slag condition, ensure line feeding under yellowish-white slag；Wire-feeding velocity 240-260m/min feeds aluminum steel argon gas stirring flow 200-
300NL/min feeds silicon-calcium wire or calcium iron wire argon gas stirring flow 50-100NL/min.
Above-mentioned patent needs repeatedly adjustment molten steel composition in steel-making, after adding slag making materials and alloy, only with argon gas
Stirring is difficult to that molten steel and slag making materials, alloy is made fully to react, and causes to introduce new impurity in molten steel, is needed again after analysis every time
Again molten steel composition is finely tuned, it is difficult to which the content for the control each element stablized, molten steel composition precision are low.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of composite steel-smelting improving steel-making precision
Technique is stirred by using the offering oxygen way and ultrasonic wave of permanent rifle position transformation, and the molten steel composition of solution is unstable, precision is low asks
Topic has the advantages that stability contorting molten steel composition, with high accuracy.
To achieve the above object, the present invention provides following technical solutions：
A kind of composite steel-smelting technique improving steel-making precision, including pneumatic steelmaking and the steel-making of LF stoves；
Wherein, pneumatic steelmaking includes the following steps：
Step 1 gets out molten iron and steel scrap, controls temperature >=1250 DEG C of molten iron, P≤0.14%, dregginess≤0.5% will
Converter is added in molten iron, then the steel scrap after preheating is added into converter；
Step 2, drop rifle is continuously blown oxygen, while the first slag material is added, and rifle position is constant when oxygen blast, oxygen pressure at 0-5 minutes
Power is 0.8-1.0MPa, and oxygen pressure is 1.1-1.3MPa at 6-10 minutes, and oxygen pressure is 1.0- at 11-15 minute
Oxygen pressure is 1.2-1.4MPa at 1.2MPa, 16-20 minutes, and point is blown 2-4 times；
Step 3, stove, thermometric, sampling, according to the analysis result of first time ingredient, determination is re-blow the time；
Step 4 proposes rifle tapping, alloy adjusting component is added, obtains molten steel；
The steel-making of LF stoves includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power 5~8min of slugging, slugging process BOTTOM ARGON BLOWING air-flow
Measure 250~350L/min, argon pressure 0.3-0.4MPa, sampling analysis；
After sampling analysis, the second slag material is added, while guided wave bar being inserted into the molten steel in stove and is carried out at ultrasonic wave in step 6
Reason, guided wave bar are connected with energy converter, and energy converter is connected by conducting wire with supersonic generator, reduce argon flow amount to 30-
50L/min；
Step 7 takes out guided wave bar, closes supersonic generator, feeds iron calcium line, and alloy progress ingredient is added after having fed iron calcium line
With the fine tuning of temperature, argon flow amount is improved to 100-150L/min stirrings, sampling analysis；
Step 8, control argon flow amount 20-40L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft
Process observation liquid steel level situation is blown, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, argon gas is closed, goes out
Steel is sent to the next step.
Through the above technical solutions, using the offering oxygen way of permanent rifle position transformation, by it when oxygen jet reaches weld pool surface
A pit is gone out in center, by changing oxygen pressure, is lenitively changed the kinetic energy of oxygen, is rushed to molten bath to change jet stream
Depth and impact area are hit, to meet needed for reaction in furnace, is conducive to slag making and slugging, avoids that splash occurs, reduces metal damage
It loses；And the dynamic conditions of reaction in furnace is significantly improved, promote decarburization, dephosphorization, desulfurization.And adding the first slag making
Ultrasonic wave is introduced when material, high-energy ultrasound forms a large amount of cavitation bubbles inside molten steel, generates shock wave after bubble collapse, herein
Effect is lower to make slag material be uniformly dispersed, and slag material is avoided to lump；Promote slag material and molten steel fast reaction simultaneously, avoids molten steel
Impurity in middle residual slag material improves precision when sampling analysis, reduces the number of adjustment molten steel composition, improves molten steel composition
Precision；Due to introducing ultrasonic wave, argon flow amount can be reduced when adding slag material, reduces the dosage of argon gas, reduces refining
Steel cost.
It is to keep the ingredient of molten steel and temperature uniform to destroy foamed slag, while reducing the oxygen of clinker that step 2 midpoint, which is blown,
Change iron content, improves the recovery rate of metal and alloy.
Further preferably, the oxygen supply intensity of oxygen is 1.5~1.8m in the step 23/t.min。
Through the above technical solutions, the offering oxygen way of permanent rifle position transformation can also reduce oxygen supply intensity, to avoid splash,
Improve the utilization rate of the oxygen of different phase.
Further preferably, the power of supersonic generator is 400-600W, frequency 25-28KHZ in the step 6.
Further preferably, ultrasonic treatment time is 5-10min in the step 6.
By using above-mentioned technical proposal, ultrasonic treatment time is too short, it is difficult to keep slag material completely broken and disperse equal
Even, sonication times are too long to be easy to make molten steel overreact, leads to element loss oxidizable in molten steel, therefore, at ultrasonic wave
It is preferably 5-10min to manage the time.
Further preferably, alloy includes carbon dust, Si-Al-Ba alloy, silicomanganese, ferrosilicon, high carbon ferro-chrome in the step 4, described
Alloy addition sequence is carbon dust, Si-Al-Ba alloy, silicomanganese, ferrosilicon, high carbon ferro-chrome.
By using above-mentioned technical proposal, alloy is added before tapping, is conducive to improve yield of alloy, reduces alloy damage
It loses, improves molten steel composition precision.
Further preferably, first slag material is lime and dolomite, and the additive amount of first slag material is 12-
20kg/t。
Further preferably, second slag material includes at least one of lime, silicon carbide, calcium carbide, fluorite.
By using above-mentioned technical proposal, at the offering oxygen way and ultrasonic wave due to the present invention using permanent rifle position transformation
Reason, it is possible to reduce the addition of slag material, former technique additive amount need 22kg/t or more.
Further preferably, the weight percent of molten iron is 75-85%, the weight percent of the steel scrap in the step 1
Than for 15-25%.
By using above-mentioned technical proposal, process for making of the invention can increase the additive amount of steel scrap, it is possible to reduce iron
The dosage of water can not only fully recycle steel scrap, and can reduce slag material to help to reduce production cost
Addition and the quantity of slag；Be conducive to mitigate the splash in blowing, improve the recovery rate of smelting；Duration of blast can also be shortened, reduced
Oxygen consumes.
In conclusion compared with prior art, the invention has the advantages that：
(1) present invention is conducive to slag making and slugging by using the offering oxygen way of permanent rifle position transformation, significantly improves anti-in stove
The dynamic conditions answered promotes decarburization, dephosphorization, desulfurization, and introduces ultrasonic wave when adding the first slag material, promotes slag material
With molten steel fast reaction, molten steel composition precision is improved；
(2) invention introduces ultrasonic waves, and argon flow amount can be reduced when adding slag material, reduce the dosage of argon gas, drop
Low steel-making cost；
(3) present invention when adding slag material by introducing ultrasonic wave so that and slag material is uniformly dispersed, and slag material is avoided to lump,
It avoids remaining the impurity in slag material in molten steel.
Description of the drawings
Fig. 1 is the process flow chart of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the present invention will be described in detail.
Embodiment 1：Referring to Fig.1, a kind of composite steel-smelting technique improving steel-making precision, including pneumatic steelmaking and the refining of LF stoves
Steel；
Wherein, pneumatic steelmaking includes the following steps：
Step 1 gets out molten iron and steel scrap, controls temperature >=1250 DEG C of molten iron, P≤0.14%, dregginess≤0.5% will
Converter is added in molten iron, then the steel scrap after preheating is added into converter, and the weight percent of molten iron is 75%, the weight percent of steel scrap
Than being 25%；
Step 2, drop rifle is continuously blown oxygen, while the first slag material is added, and the first slag material is lime and dolomite, and first
The additive amount of slag material is 12kg/t, and rifle position is constant when oxygen blast, and the oxygen supply intensity of oxygen is 1.6m3Oxygen when/t.min, 0-5 minute
Atmospheric pressure is 0.9MPa, and oxygen pressure is 1.1MPa at 6-10 minutes, and oxygen pressure is 1.0MPa at 11-15 minute, and 16-20 divides
Oxygen pressure is 1.2MPa when clock, and point is blown 2 times；
Step 3, stove, thermometric, sampling, according to the analysis result of first time ingredient, determination is re-blow the time；
Step 4 proposes rifle tapping, and alloy adjusting component is added, and alloy addition sequence is carbon dust, Si-Al-Ba alloy, silicomanganese, ferrosilicon, high-carbon
Ferrochrome obtains molten steel；
The steel-making of LF stoves includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power slugging 5min, slugging process argon bottom-blowing flow
250L/min, argon pressure 0.3MPa, sampling analysis；
After sampling analysis, the second slag material is added in step 6, and the second slag material is lime, lime adding amount 500kg, simultaneously
To carry out ultrasonication in the molten steel that guided wave bar is inserted into stove, guided wave bar is connected with energy converter, energy converter by conducting wire and
Supersonic generator is connected, and the power of supersonic generator is 400W, frequency 25KHZ, and ultrasonic treatment time is
10min reduces argon flow amount to 50L/min；
Step 7 takes out guided wave bar, closes supersonic generator, feeds iron calcium line, hello iron calcium line 200m/ stoves, wire-feeding velocity 3m/s,
The fine tuning that alloy carries out ingredient and temperature is added after having fed iron calcium line, improves argon flow amount to 100L/min stirrings, sampling analysis；
Step 8, control argon flow amount 20L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft blow
Process observation liquid steel level situation, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, closes argon gas, tapping
It send to the next step.
Wherein, guided wave bar, energy converter and the supersonic generator that ultrasonication uses in step 6 are the prior art,
Therefore, the present embodiment no longer repeats its concrete structure.
Embodiment 2：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 1
In the weight percent of molten iron be 80%, the weight percent of steel scrap is 20%.
Embodiment 3：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 1
In the weight percent of molten iron be 85%, the weight percent of steel scrap is 15%.
Embodiment 4：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
It specifically includes：Drop rifle is continuously blown oxygen, while the first slag material is added, and the first slag material is lime and dolomite, and first makes
The additive amount of slag charge is 12kg/t, and rifle position is constant when oxygen blast, and the oxygen supply intensity of oxygen is 1.5m3Oxygen when/t.min, 0-5 minute
Pressure is 0.8MPa, and oxygen pressure is 1.2MPa at 6-10 minutes, and oxygen pressure is 1.1MPa at 11-15 minute, 16-20 minutes
When oxygen pressure be 1.3MPa, point blow 2 times.
Embodiment 5：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
It specifically includes：Drop rifle is continuously blown oxygen, while the first slag material is added, and the first slag material is lime and dolomite, and first makes
The additive amount of slag charge is 12kg/t, and rifle position is constant when oxygen blast, and the oxygen supply intensity of oxygen is 1.8m3Oxygen when/t.min, 0-5 minute
Pressure is 1MPa, and oxygen pressure is 1.3MPa at 6-10 minutes, and oxygen pressure is 1.2MPa at 11-15 minute, at 16-20 minutes
Oxygen pressure is 1.4MPa, and point is blown 2 times.
Embodiment 6：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
It blows 3 times at midpoint.
Embodiment 7：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
It blows 4 times at midpoint.
Embodiment 8：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
In the first slag material additive amount be 15kg/t.
Embodiment 9：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
In the first slag material additive amount be 20kg/t.
Embodiment 10：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
Five specifically include：Qualified molten steel will be bessemerized to be added in LF stoves, power slugging 7min, slugging process argon bottom-blowing flow
300L/min, argon pressure 0.4MPa, sampling analysis.
Embodiment 11：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
Five specifically include：Qualified molten steel will be bessemerized to be added in LF stoves, power slugging 8min, slugging process argon bottom-blowing flow
350L/min, argon pressure 0.4MPa, sampling analysis.
Embodiment 12：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six is fluorite.
Embodiment 13：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six is calcium carbide.
Embodiment 14：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six is silicon carbide.
Embodiment 15：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six includes lime and fluorite.
Embodiment 16：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six includes lime, fluorite, calcium carbide.
Embodiment 17：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The second slag material in six includes lime, silicon carbide, calcium carbide, fluorite.
Embodiment 18：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The power of supersonic generator is 400W, frequency 28KHZ, ultrasonic treatment time 8min in six.
Embodiment 19：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The power of supersonic generator is 500W, frequency 25KHZ, ultrasonic treatment time 7min in six.
Embodiment 20：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The power of supersonic generator is 500W, frequency 28KHZ, ultrasonic treatment time 6min in six.
Embodiment 21：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
The power of supersonic generator is 600W, frequency 25KHZ, ultrasonic treatment time 5min in six.
Embodiment 22：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, LF stoves
Steel-making includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power slugging 5min, slugging process argon bottom-blowing flow
250L/min, argon pressure 0.3MPa, sampling analysis；
After sampling analysis, the second slag material is added in step 6, and the second slag material is lime, lime adding amount 500kg, simultaneously
To carry out ultrasonication in the molten steel that guided wave bar is inserted into stove, guided wave bar is connected with energy converter, energy converter by conducting wire and
Supersonic generator is connected, and the power of supersonic generator is 400W, frequency 25KHZ, and ultrasonic treatment time is
10min reduces argon flow amount to 30L/min；
Step 7 takes out guided wave bar, closes supersonic generator, feeds iron calcium line, hello iron calcium line 200m/ stoves, wire-feeding velocity 3m/s,
The fine tuning that alloy carries out ingredient and temperature is added after having fed iron calcium line, improves argon flow amount to 120L/min stirrings, sampling analysis；
Step 8, control argon flow amount 30L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft blow
Process observation liquid steel level situation, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, closes argon gas, tapping
It send to the next step.
Embodiment 23：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, LF stoves
Steel-making includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power slugging 5min, slugging process argon bottom-blowing flow
250L/min, argon pressure 0.3MPa, sampling analysis；
After sampling analysis, the second slag material is added in step 6, and the second slag material is lime, lime adding amount 500kg, simultaneously
To carry out ultrasonication in the molten steel that guided wave bar is inserted into stove, guided wave bar is connected with energy converter, energy converter by conducting wire and
Supersonic generator is connected, and the power of supersonic generator is 400W, frequency 25KHZ, and ultrasonic treatment time is
10min reduces argon flow amount to 40L/min；
Step 7 takes out guided wave bar, closes supersonic generator, feeds iron calcium line, hello iron calcium line 200m/ stoves, wire-feeding velocity 3m/s,
The fine tuning that alloy carries out ingredient and temperature is added after having fed iron calcium line, improves argon flow amount to 150L/min stirrings, sampling analysis；
Step 8, control argon flow amount 40L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft blow
Process observation liquid steel level situation, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, closes argon gas, tapping
It send to the next step.
Comparative example 1：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step 2
It specifically includes, drop rifle is continuously blown oxygen, while the first slag material is added, and the first slag material is lime and dolomite, and first makes
The additive amount of slag charge is 12kg/t, becomes rifle position operation oxygen supply using constant pressure, the oxygen supply intensity of oxygen is 1.6m3/ t.min, oxygen
Pressure 1MPa, oxygen blow duration 20min.
Comparative example 2：A kind of composite steel-smelting technique improving steel-making precision, difference from example 1 is that, step
Two, drop rifle is continuously blown oxygen, while the first slag material is added, and the first slag material is lime and dolomite, the first slag material
Additive amount is 12kg/t, and rifle position is constant when oxygen blast, and the oxygen supply intensity of oxygen is 1.6m3Oxygen pressure is when/t.min, 0-5 minute
Oxygen pressure is 1.2MPa at 0.7MPa, 6-10 minutes, and oxygen pressure is 1.3MPa at 11-15 minute, oxygen at 16-20 minutes
Pressure is 1.5MPa, and point is blown 2 times.
Comparative example 3：A kind of LF stoves steelmaker is disclosed in Chinese invention patent using Publication No. CN105714018A
The embodiment one of skill, which is handled, bessemerizes qualified molten steel.
Comparative example 4：The steel-making of LF stoves includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power slugging 5min, slugging process argon bottom-blowing flow
250L/min, argon pressure 0.3MPa, sampling analysis；
After sampling analysis, the second slag material is added in step 6, and the second slag material is lime, and lime adding amount 500kg is reduced
Argon flow amount is to 50L/min；
Step 7 feeds iron calcium line, feeds iron calcium line 200m/ stoves, and alloy progress ingredient is added after having fed iron calcium line in wire-feeding velocity 3m/s
With the fine tuning of temperature, argon flow amount is improved to 100L/min stirrings, sampling analysis；
Step 8, control argon flow amount 20L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft blow
Process observation liquid steel level situation, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, closes argon gas, tapping
It send to the next step.
Experiment one
Test method：20 stove molten steel are handled using the technique in embodiment 1-23 and comparative example 1-4 respectively, molten steel after detection process
Each component content calculate the middle limit rate of each ingredient according to the component requirements in table 1, middle limit rate=each ingredient is fallen in middle limit model
Number/the 10*100% enclosed.
(3) test result：Embodiment 1-23 and the testing result of molten steel after comparative example 1-4 processing are as shown in table 2.By table 2
Known to.The middle limit rate of each ingredient of molten steel is 85% or more after embodiment 1-23 processing, and the middle limit rate of comparative example 1-4 is only
30-50% illustrates offering oxygen way of the present invention by using permanent rifle position transformation, and introduces ultrasound when adding the first slag material
Wave promotes slag material and molten steel fast reaction, improves molten steel composition precision, and reduce the impurity such as P, S, Ni, Cu in molten steel.
The steel-making tapping of 1 LF stoves of table requires
The testing result of 2 embodiment 1-23 of table and molten steel after comparative example 1-4 processing
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of composite steel-smelting technique improving steel-making precision, which is characterized in that made steel including pneumatic steelmaking and LF stoves；
Wherein, pneumatic steelmaking includes the following steps：
Step 1 gets out molten iron and steel scrap, controls temperature >=1250 DEG C of molten iron, P≤0.14%, dregginess≤0.5%, by iron
Converter is added in water, then the steel scrap after preheating is added into converter；
Step 2, drop rifle is continuously blown oxygen, while the first slag material is added, and rifle position is constant when oxygen blast, oxygen pressure at 0-5 minutes
Power is 0.8-1.0MPa, and oxygen pressure is 1.1-1.3MPa at 6-10 minutes, and oxygen pressure is 1.0- at 11-15 minute
Oxygen pressure is 1.2-1.4MPa at 1.2MPa, 16-20 minutes, and point is blown 2-4 times；
Step 3, stove, thermometric, sampling, according to the analysis result of first time ingredient, determination is re-blow the time；
Step 4 proposes rifle tapping, alloy adjusting component is added, obtains molten steel；
The steel-making of LF stoves includes the following steps：
Step 5 will be bessemerized qualified molten steel and is added in LF stoves, and power 5~8min of slugging, slugging process BOTTOM ARGON BLOWING air-flow
Measure 250~350 L/min, argon pressure 0.3-0.4MPa, sampling analysis；
After sampling analysis, the second slag material is added, while guided wave bar being inserted into the molten steel in stove and is carried out at ultrasonic wave in step 6
Reason, guided wave bar are connected with energy converter, and energy converter is connected by conducting wire with supersonic generator, reduce argon flow amount to 30-
50L/min；
Step 7 takes out guided wave bar, closes supersonic generator, feeds iron calcium line, and alloy progress ingredient is added after having fed iron calcium line
With the fine tuning of temperature, argon flow amount is improved to 100-150L/min stirrings, sampling analysis；
Step 8, control argon flow amount 20-40L/min carries out soft blow after temperature, ingredient qualification, and the soft blow time is more than 12min, soft
Process observation liquid steel level situation is blown, avoids molten steel exposed, after outbound preceding ingredient, temperature reach technological requirement, argon gas is closed, goes out
Steel is sent to the next step.
2. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that oxygen in the step 2
The oxygen supply intensity of gas is 1.5~1.8m3/t.min。
3. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that surpass in the step 6
The power of sonic generator is 400-600W, frequency 25-28KHZ.
4. according to the composite steel-smelting technique of the raising steel-making precision described in claim 1, which is characterized in that in the step 6
Ultrasonic treatment time is 5-10min.
5. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that closed in the step 4
Gold include carbon dust, Si-Al-Ba alloy, silicomanganese, ferrosilicon, high carbon ferro-chrome, the alloy addition sequence be carbon dust, Si-Al-Ba alloy, silicomanganese, ferrosilicon,
High carbon ferro-chrome.
6. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that first slag material
Additive amount for lime and dolomite, first slag material is 12-20kg/t.
7. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that second slag material
Including at least one of lime, silicon carbide, calcium carbide, fluorite.
8. the composite steel-smelting technique according to claim 1 for improving steel-making precision, which is characterized in that iron in the step 1
The weight percent of water is 75-85%, and the weight percent of the steel scrap is 15-25%.
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