CN107988456A - A kind of converter steelmaking process - Google Patents
A kind of converter steelmaking process Download PDFInfo
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- CN107988456A CN107988456A CN201810013096.3A CN201810013096A CN107988456A CN 107988456 A CN107988456 A CN 107988456A CN 201810013096 A CN201810013096 A CN 201810013096A CN 107988456 A CN107988456 A CN 107988456A
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- Prior art keywords
- oxygen
- converter
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- steelmaking process
- rifle
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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
- C21C5/32—Blowing from above
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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 discloses a kind of converter steelmaking process, is related to iron and steel smelting technology field, solves the problems, such as metal loss when constant pressure becomes rifle position oxygen supply.It comprises the following steps：Step 1, gets out molten iron and steel scrap, molten iron is added converter, then the steel scrap after preheating is added into converter；Step 2, drop rifle are continuously blown oxygen, while add first slag material, using the offering oxygen way of permanent rifle position transformation during oxygen blast；Step 3, second batch slag material is added at 56 minutes and continues to blow；Step 4, stove, thermometric, sampling, and determine the time of re-blowing；Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, carries out the outer double refining of converter.This process advan avoids splash, reduces metal loss, promote decarburization, dephosphorization, desulfurization in slag making and slugging.
Description
Technical field
The present invention relates to iron and steel smelting technology field, more specifically, it relates to a kind of converter steelmaking process.
Background technology
Pneumatic steelmaking is that oxygen is blown into the pig iron of melting, aoxidizes impurity silicon, manganese etc..Released during oxidation
Substantial amounts of heat (temperature that can make the pig iron containing 1% silicon raises 200 degrees Celsius), can make to reach sufficiently high temperature in stove.Cause
In addition this pneumatic steelmaking need not use fuel, the basic task of steel-making is decarburization, dephosphorization, desulfurization, deoxidation, removes removing and harmful gas
And non-metallic inclusion, improve temperature and adjusting component.
A kind of method of semi-steel making, the side are disclosed in the Chinese invention patent of Publication No. CN102199682A
Method includes the bessemerizing of half steel, the addition of slag former, the control for bessemerizing terminal, tapping and Argon station stirring molten steel, its
In, by the carbon content control in molten steel in 0.04wt%~0.10wt% in the control for bessemerizing terminal, and
In tapping process enter carbon to ladle power mouth, step bessemerized in the half steel, the oxygen supply pressure of oxygen rifle for 0.8~
0.9Mpa, oxygen supply intensity are 3.2~3.7m3/t steel .min, and oxygen supply time is 750~1020 seconds, and becomes rifle position behaviour using constant pressure
Make.
Rifle position oxygen supply is become using constant pressure in above-mentioned patent, during the operation of high rifle position, is conducive to slugging, but melting bath stirring difference and
And the oxidation of solute primary colors is slower, the utilization rate of oxygen is low, and when low rifle position operates, the FeO contents in slag are low, and are unfavorable for slugging,
Need frequently to change rifle position in practical operation, rifle position change is also easy to that splash occurs not in time, causes metal loss.
The content of the invention
In view of the deficienciess of the prior art, the purpose of the present invention one is to provide a kind of converter steelmaking process, by adopting
With the offering oxygen way of permanent rifle position transformation, above-mentioned technical problem is solved, it is conducive to slag making and slugging, avoids that splash occurs,
The advantages of reducing metal loss.
To achieve the above object one, the present invention provides following technical solution：
A kind of converter steelmaking process, comprises the following steps：
Step 1, gets out molten iron and steel scrap, controls temperature >=1250 DEG C of molten iron, P≤0.12%, Cr≤0.25%, by iron
Water adds converter, then the steel scrap after preheating is added into converter；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7-0.9MPa, and oxygen pressure is 1.2-1.4MPa at 7-10 minutes, and oxygen pressure is 1.0- at 11-15 minutes
Oxygen pressure is 1.3-1.5MPa at 1.2MPa, 16-18 minutes；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow；
Step 4, stove, thermometric, sampling, and determine the time of re-blowing；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, carries out the outer double refining of converter.
Through the above technical solutions, steel scrap is the metal charge of pneumatic steelmaking, during pneumatic steelmaking, the physical thermal of molten iron and change
Learn heat to be enough the temperature in molten bath to be heated to 1600 DEG C of steel-making temperature acted on from 1250-1300 DEG C, and have surplus heat, steel scrap
These surplus heats can be consumed after addition, adjust the temperature in molten bath, and steel scrap can also be recycled.By using permanent rifle position
The offering oxygen way of transformation, a pit is gone out when oxygen jet reaches weld pool surface by its center, by varying oxygen pressure, is delayed
Change the kinetic energy of oxygen with ground, so that change impact depth and impact area of the jet stream to molten bath, to meet needed for reaction in furnace,
Be conducive to slag making and slugging, avoid that splash occurs, reduce metal loss；And significantly improve the dynamics bar of reaction in furnace
Part, promotes decarburization, dephosphorization, desulfurization.
More preferably, the percentage by weight of the molten iron is 70-75%, and the percentage by weight of the steel scrap is 25-
30%.
Through the above technical solutions, by varying converter steelmaking process, increase the additive amount of steel scrap, it is possible to reduce molten iron
Dosage can not only fully recycle steel scrap, and can reduce slag material so as to contribute to the production cost of reduction converter
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, subtracted
Few oxygen consumption and increase yield.
More preferably, the oxygen supply intensity of the oxygen is 2.0~2.5m3/t.min。
Through the above technical solutions, the offering oxygen way of permanent rifle position transformation can also reduce oxygen supply intensity, so that splash is avoided,
Improve the utilization rate of the oxygen of different phase.
More preferably, the basicity of clinker is controlled in 3.0-3.8 in the step 2.
Through the above technical solutions, reducing erosion of the clinker to furnace lining, be conducive to the fusing of lime, ensure effective desulfurization and
Dephosphorization.
More preferably, the dosage of the aluminium cake is 0.8-1kg/t, and the dosage of the lime is 400-450kg.
Through the above technical solutions, it is to remove the oxygen in molten steel to add aluminium cake, lime forms one layer of top in molten steel face
Slag, has effectively completely cut off air, and ensure that molten steel has certain oxygen content, prevents from inhaling nitrogen.
More preferably, C >=0.10%, P≤0.018%, tapping temperature 1615-1635 are controlled in the step 4
℃。
Through the above technical solutions, the component content of molten steel is detected before tapping, so as to control blowing end point.
More preferably, the component of molten steel is C0.37-0.42%, Si0.1-0.17% when tapping in the step 5,
Mn0.5-0.6%, P≤0.025%, the temperature of molten steel is 1520-1530 DEG C.
Through the above technical solutions, be conducive to follow-up double refining.
More preferably, described first slag material and second batch slag material are lime and dolomite, the slag making
The additive amount of material is 12-20kg/t.
Through the above technical solutions, since the present invention is using the offering oxygen way of permanent rifle position transformation, and increase adding for steel scrap
Dosage, it is possible to reduce the addition of slag material, former technique additive amount need 22-33kg/t.
Rifle position selects specific rifle position height according to produce reality situation between 700-1100mm in the present invention.
The molten steel produced in the present invention is suitable for production S45 steel and S45CTi steel.
In conclusion compared with prior art, the invention has the advantages that：
(1) by using the offering oxygen way of permanent rifle position transformation, when oxygen jet reaches weld pool surface by its center go out one it is recessed
Hole, by varying the kinetic energy of oxygen pressure, lenitively change oxygen, so as to change impact depth and shock surface of the jet stream to molten bath
Product, to meet needed for reaction in furnace, to be conducive to slag making and slugging, avoids that splash occurs, reduces metal loss；
(2) offering oxygen way of permanent rifle position transformation significantly improves the dynamic conditions of reaction in furnace, improves the oxygen of different phase
The utilization rate of gas, promotes decarburization, dephosphorization, desulfurization；
(3) since the present invention is using the offering oxygen way of permanent rifle position transformation, and increase the additive amount of steel scrap, can not only fully return
Receipts utilize steel scrap, can also reduce the addition of slag material.
Brief description of the drawings
Fig. 1 is the process flow chart of the present invention.
Embodiment
With reference to the accompanying drawings and examples, the present invention will be described in detail.
The molten steel produced in the present invention is suitable for production S45 steel and S45CTi steel.
Embodiment 1：As shown in Figure 1, a kind of converter steelmaking process, comprises the following steps：
Step 1, gets out molten iron and steel scrap, and the percentage by weight of molten iron is 70%, and the percentage by weight of steel scrap is 30%, control
Temperature >=1250 DEG C of molten iron processed, P≤0.12%, Cr≤0.25%, converter is added by molten iron, then into converter after addition preheating
Steel scrap；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7MPa, and oxygen pressure is 1.2MPa at 7-10 minutes, and oxygen pressure is 1.0MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.3MPa, the oxygen supply intensity of oxygen is 2.0m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.37%, Si0.12%, Mn0.5%, P0.021%, and the temperature of molten steel is 1520 DEG C, is carried out secondary outside converter
Refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the additive amount of slag material is 12kg/t.
Embodiment 2：A kind of converter steelmaking process, is with the difference of embodiment 1, comprises the following steps：
Step 1, gets out molten iron and steel scrap, the percentage by weight of molten iron is 72.5%, and the percentage by weight of steel scrap is
27.5%, temperature >=1250 DEG C of molten iron are controlled, P≤0.12%, Cr≤0.25%, converter is added by molten iron, then into converter
Add the steel scrap after preheating；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7MPa, and oxygen pressure is 1.2MPa at 7-10 minutes, and oxygen pressure is 1.0MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.3MPa, the oxygen supply intensity of oxygen is 2.0m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.42%, Si0.1%, Mn0.6%, P0.015%, and the temperature of molten steel is 1525 DEG C, is carried out secondary outside converter
Refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the additive amount of slag material is 12kg/t.
Embodiment 3：A kind of converter steelmaking process, is, step 1 with the difference of embodiment 1, be ready to molten iron and
Steel scrap, the percentage by weight of molten iron are 75%, and the percentage by weight of steel scrap is 25%, control temperature >=1250 DEG C of molten iron, P≤
0.12%, Cr≤0.25%, converter is added by molten iron, then the steel scrap after preheating is added into converter；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7MPa, and oxygen pressure is 1.2MPa at 7-10 minutes, and oxygen pressure is 1.0MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.3MPa, the oxygen supply intensity of oxygen is 2.0m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.4%, Si0.17%, Mn0.55%, P0.018%, and the temperature of molten steel is 1530 DEG C, is carried out secondary outside converter
Refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the additive amount of slag material is 12kg/t.
Embodiment 4：A kind of converter steelmaking process, is with the difference of embodiment 1, comprises the following steps：
Step 1, gets out molten iron and steel scrap, and the percentage by weight of molten iron is 70%, and the percentage by weight of steel scrap is 30%, control
Temperature >=1250 DEG C of molten iron processed, P≤0.12%, Cr≤0.25%, converter is added by molten iron, then into converter after addition preheating
Steel scrap；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.8MPa, and oxygen pressure is 1.3MPa at 7-10 minutes, and oxygen pressure is 1.1MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.4MPa, the oxygen supply intensity of oxygen is 2.3m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.39%, Si0.15%, Mn0.5%, P0.019%, and the temperature of molten steel is 1520 DEG C, is carried out secondary outside converter
Refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the additive amount of slag material is 12kg/t.
Embodiment 5：A kind of converter steelmaking process, is with the difference of embodiment 1, comprises the following steps：
Step 1, gets out molten iron and steel scrap, and the percentage by weight of molten iron is 70%, and the percentage by weight of steel scrap is 30%, control
Temperature >=1250 DEG C of molten iron processed, P≤0.12%, Cr≤0.25%, converter is added by molten iron, then into converter after addition preheating
Steel scrap；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.9MPa, and oxygen pressure is 1.4MPa at 7-10 minutes, and oxygen pressure is 1.2MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.5MPa, the oxygen supply intensity of oxygen is 2.5m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.4%, Si0.15%, Mn0.53%, P0.022%, and the temperature of molten steel is 1521 DEG C, is carried out secondary outside converter
Refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the additive amount of slag material is 12kg/t.
Embodiment 6：A kind of converter steelmaking process, is with the difference of embodiment 1, comprises the following steps：
Step 1, gets out molten iron and steel scrap, and the percentage by weight of molten iron is 70%, and the percentage by weight of steel scrap is 30%, control
Temperature >=1250 DEG C of molten iron processed, P≤0.12%, Cr≤0.25%, converter is added by molten iron, then into converter after addition preheating
Steel scrap；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7MPa, and oxygen pressure is 1.2MPa at 7-10 minutes, and oxygen pressure is 1.0MPa at 11-15 minutes, 16-18 minutes
When oxygen pressure be 1.3MPa, the oxygen supply intensity of oxygen is 2.0m3/t.min；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow, the basicity of clinker is controlled 3.0；
Step 4, stove, thermometric, sampling, controls C >=0.10%, P≤0.018%, and tapping temperature is 1615 DEG C, and determines to mend
Blow the time；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, and the dosage of aluminium cake is 0.8kg/t,
The dosage of lime is 400kg, according to the additive amount of the low nitrogen carbon dust of Composition Control of molten steel, silicomanganese, ferrosilicon during tapping, steel during tapping
The component of water is C0.41%, Si0.14%, Mn0.58%, P0.017%, and the temperature of molten steel is 1524 DEG C, carries out converter outer two
Secondary refining.
Wherein, first slag material and second batch slag material are the proportioning root of lime and dolomite, lime and dolomite
According to slag in smelting process component and determined by mass balance, the total amount of adding of slag material is 15kg/t.
Embodiment 7：A kind of converter steelmaking process, is with the difference of embodiment 6, and the total amount of adding of slag material is
20kg/t。
Embodiment 8：A kind of converter steelmaking process, is with the difference of embodiment 1, the basicity control of clinker in step 3
System is 3.4.
Embodiment 9：A kind of converter steelmaking process, is with the difference of embodiment 1, the basicity control of clinker in step 3
System is 3.8.
Embodiment 10：A kind of converter steelmaking process, is that tapping temperature is in step 4 with the difference of embodiment 1
1625℃。
Embodiment 11：A kind of converter steelmaking process, is that tapping temperature is in step 4 with the difference of embodiment 1
1635℃。
Embodiment 12：A kind of converter steelmaking process, is with the difference of embodiment 1, the dosage of aluminium cake in step 5
For 0.9kg/t.
Embodiment 13：A kind of converter steelmaking process, is with the difference of embodiment 1, the dosage of aluminium cake in step 5
For 1kg/t.
Embodiment 14：A kind of converter steelmaking process, is with the difference of embodiment 1, the dosage of lime in step 5
For 425kg.
Embodiment 15：A kind of converter steelmaking process, is with the difference of embodiment 1, the dosage of lime in step 5
For 450kg.
Comparative example 1：A kind of converter steelmaking process, is, step 2 is with the difference of embodiment 1：Drop rifle is continuously blown
Enter oxygen, while add first slag material, rifle position operation oxygen supply, oxygen blow duration 18 minutes, oxygen pressure are become using constant pressure
1MPa, the oxygen supply intensity of oxygen is 2.0m3/t.min。
Comparative example 2：A kind of converter steelmaking process, is, step 2 is with the difference of embodiment 1：Drop rifle is continuously blown
Enter oxygen, while add first slag material, rifle position is constant during oxygen blast, and oxygen pressure is 0.7MPa at 0-6 minutes, 7-10 minutes
When oxygen pressure be 1MPa, oxygen pressure is 1.3MPa at 11-15 minutes, and oxygen pressure is 1.6MPa at 16-18 minutes, oxygen
Oxygen supply intensity be 2.0m3/t.min。
Comparative example 3：A kind of converter steelmaking process, is, step 2 is with the difference of embodiment 1：Drop rifle is continuously blown
Enter oxygen, while add first slag material, rifle position is constant during oxygen blast, and oxygen pressure is 1.5MPa at 0-6 minutes, 7-10 minutes
When oxygen pressure be 1.3MPa, oxygen pressure is 1MPa at 11-15 minutes, and oxygen pressure is 0.7MPa at 16-18 minutes, oxygen
Oxygen supply intensity be 2.0m3/t.min。
In production process, the clinker that embodiment 1-15 and comparative example 1-3 is produced is collected, measures the iron content in clinker, such as
Fruit has splash, the loss amount of iron caused by recording molten steel splash, and the iron content, splash in calculating clinker cause the loss of iron
Percentage that is amount and accounting for molten steel, is iron loss vector, the results are shown in Table 1.As shown in Table 1, the present invention is by using permanent rifle
The offering oxygen way of position transformation, is conducive to slag making and slugging, avoids that splash occurs, reduces iron loss.
The iron loss vector of table 1 embodiment 1-15 and comparative example 1-3
The molten steel composition after embodiment 1-15 and comparative example 1-3 makes steel is measured respectively, and the results are shown in Table 2.Can by table 2
To know, the offering oxygen way of permanent rifle position transformation improves the dynamic conditions of reaction in furnace, improves the utilization rate of the oxygen of different phase,
Promote decarburization, dephosphorization, desulfurization.
Molten steel composition after table 2 embodiment 1-15 and comparative example 1-3 steel-making
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of converter steelmaking process, it is characterised in that comprise the following steps：
Step 1, gets out molten iron and steel scrap, controls temperature >=1250 DEG C of molten iron, P≤0.12%, Cr≤0.25%, by molten iron
Converter is added, then the steel scrap after preheating is added into converter；
Step 2, drop rifle are continuously blown oxygen, while add first slag material, and rifle position is constant during oxygen blast, oxygen at 0-6 minutes
Pressure is 0.7-0.9MPa, and oxygen pressure is 1.2-1.4MPa at 7-10 minutes, and oxygen pressure is 1.0- at 11-15 minutes
Oxygen pressure is 1.3-1.5MPa at 1.2MPa, 16-18 minutes；
Step 3, second batch slag material is added at 5-6 minutes and continues to blow；
Step 4, stove, thermometric, sampling, and determine the time of re-blowing；
Step 5, proposes rifle tapping, sequentially adds low nitrogen carbon dust, aluminium cake, silicomanganese, ferrosilicon, lime, carries out the outer double refining of converter.
2. converter steelmaking process according to claim 1, it is characterised in that the percentage by weight of the molten iron is 70-
75%, the percentage by weight of the steel scrap is 25-30%.
3. converter steelmaking process according to claim 1, it is characterised in that the oxygen supply intensity of the oxygen for 2.0~
2.5m3/t.min。
4. converter steelmaking process according to claim 1, it is characterised in that the basicity control of clinker exists in the step 2
3.0-3.8。
5. converter steelmaking process according to claim 1, it is characterised in that the dosage of the aluminium cake is 0.8-1kg/t, institute
The dosage for stating lime is 400-450kg.
6. converter steelmaking process according to claim 1, it is characterised in that in the step 4 control C >=0.10%, P≤
0.018%, tapping temperature is 1615-1635 DEG C.
7. converter steelmaking process according to claim 6, it is characterised in that the component of molten steel when tapping in the step 5
For C 0.37-0.42%, Si 0.1-0.17%, Mn 0.5-0.6%, P≤0.025%, the temperature of molten steel is 1520-1530 DEG C.
8. converter steelmaking process according to claim 1, it is characterised in that first described slag material and second batch slag making
Material is lime and dolomite, and the additive amount of the slag material is 12-20kg/t.
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| CN110468249A (en) * | 2019-09-09 | 2019-11-19 | 武汉钢铁有限公司 | A kind of Properties of Heavy Rail Steel converter smelting method that can reduce oxygen content when tapping |
| CN114231686A (en) * | 2021-11-26 | 2022-03-25 | 山东钢铁集团永锋临港有限公司 | Method for smelting with less slag left under converter dry dedusting process condition |
| CN114438276A (en) * | 2022-02-11 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Method for shortening smelting period of converter |
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| CN114438276A (en) * | 2022-02-11 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Method for shortening smelting period of converter |
| CN114438276B (en) * | 2022-02-11 | 2022-08-09 | 山东钢铁集团永锋临港有限公司 | Method for shortening smelting period of converter |
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