CN112094987A - Method for controlling carbon content of molten steel - Google Patents
Method for controlling carbon content of molten steel Download PDFInfo
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- CN112094987A CN112094987A CN202011094011.2A CN202011094011A CN112094987A CN 112094987 A CN112094987 A CN 112094987A CN 202011094011 A CN202011094011 A CN 202011094011A CN 112094987 A CN112094987 A CN 112094987A
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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
- 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
- C21C5/34—Blowing through the bath
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/072—Treatment with gases
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- 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
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Abstract
The invention discloses a method for controlling the carbon content of molten steel, and relates to the technical field of ferrous metallurgy. The method for controlling the carbon content of the molten steel properly improves the end point carbon content of the converter on the basis of the existing control of the end point carbon content of the converter, ensures that partial [ C ] and [ O ] in the molten steel in the steel tank further react to generate { CO } gas to be discharged before the alloy is added by reasonably adjusting the bottom argon blowing flow of the steel tank and properly delaying the alloy addition in the tapping process, and simultaneously reduces the [ C ] and the [ O ] in the molten steel, thereby not only reducing the pressure of the converter for lowering the carbon, but also ensuring that the carbon content of the molten steel meets the component requirements of steel, simultaneously effectively reducing the oxygen content in the molten steel and improving the alloy yield.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for controlling the carbon content of molten steel.
Background
The low-carbon steel grade is produced by a converter, in particular to the low-carbon aluminum killed steel with the carbon content [ C ] of finished products such as SPHC and the like less than or equal to 0.07 percent, and the process flow is as follows: molten iron pretreatment → converter → argon blowing station → LF furnace → CSP continuous casting. As the subsequent procedures have no carbon reduction measures, and the electrode heating and alloy component adjustment have certain recarburization effect in the refining process of the molten steel in the LF furnace, particularly the recarburization of the electrode is taken as the main part, according to calculation, the highest recarburization amount of low-carbon aluminum killed steel such as SPHC and the like produced by the LF furnace can reach 0.01 percent, in order to ensure that the finished product carbon is qualified, in the prior art, the carbon content of the molten steel at the end point of the converter is generally controlled to be lower than the upper limit of the carbon content specification of the finished product of the steel by 0.020 percent, and the carbon content of the. Since the carbon-oxygen concentration product of the molten steel at the end point of the converter is relatively constant, the carbon content [ C ] of the molten steel at the end point is low and the oxygen content [ O ] is high. When the carbon content [ C ] of the molten steel at the end point is less than or equal to 0.050 percent, the oxygen content [ O ] of the molten steel and the TFe in the slag are increased rapidly along with the further reduction of the carbon content [ C ] of the molten steel, so that a series of adverse effects of increased consumption of steel materials, increased corrosion to a furnace lining, difficult maintenance of converter conditions, increased consumption of tapping deoxidation alloy, increased content of impurities in steel, poor quality of the molten steel and the like are caused. Aiming at the above adverse effects of the converter smelting of low carbon steel grades, in particular to low carbon aluminum killed steel with the carbon content [ C ] of the steel grade product less than or equal to 0.070 percent, the prior art lacks an effective solution.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for controlling the carbon content of molten steel, which solves the problems of a series of adverse effects of increased consumption of steel iron materials, aggravated corrosion to a furnace lining, difficult maintenance of the furnace condition of a converter, increased consumption of tapping deoxidation alloy, increased content of impurities in steel, poor quality of molten steel and the like caused by the fact that the oxygen content [ O ] of the molten steel and the TFe in slag are increased rapidly along with the further reduction of the carbon content [ C ] of the molten steel when the carbon content [ C ] of the molten steel is less than or equal to 0.050% in the process of producing low-carbon steel by the converter.
(II) technical scheme
The following favorable conditions for further reaction of carbon and oxygen exist in the converter tapping process:
(1) the carbon-oxygen reaction [ C ] + [ O ] ═ CO } is an exothermic reaction, and the [ C ] in the molten steel and the excessive [ O ] in the molten steel generate { CO } gas to be precipitated along with the reduction of the temperature of the molten steel in the process of tapping of the converter;
(2) during the tapping process of the converter, argon is blown from the bottom of the steel tank and stirred in the whole process, for the { CO } gas, the argon bubbles are equivalent to a small vacuum chamber, the { CO } gas automatically diffuses into the small vacuum chamber and is taken out of molten steel, and meanwhile, the small argon bubbles are also ideal sites for carbon-oxygen reaction;
(3) in the tapping process, the stirring effect of argon blown from the bottom of the steel tank on molten steel in the steel tank and the impact stirring effect of steel flow flowing out of a converter tapping hole with a certain height difference on the molten steel in the steel tank provide good dynamic conditions for carbon-oxygen reaction.
When the deoxidation alloy is added, the reaction of the [ O ] in the molten steel with the deoxidation alloy is preferentially performed over the reaction of the [ C ] in the molten steel with the deoxidation alloy, and the reaction of the [ C ] and the [ O ] in the molten steel is suppressed.
The invention utilizes the principle to properly improve the end point carbon content of the converter on the basis of controlling the end point carbon content of the converter in the prior art when producing low-carbon steel, ensures that partial [ C ] and [ O ] in molten steel in the steel tank further react to generate { CO } gas to be discharged before the alloy is added by reasonably adjusting the bottom blowing argon flow of the steel tank and properly delaying the addition of the alloy in the tapping process, and simultaneously reduces the [ C ] and the [ O ] in the molten steel, thereby not only reducing the pressure of drawing low carbon by the converter, but also ensuring that the carbon content of the molten steel meets the component requirement of the steel, simultaneously effectively reducing the oxygen content in the molten steel and improving the alloy yield. In the prior art, when low-carbon steel is produced, the carbon content of molten steel at the end point of a converter is generally controlled below 0.020% of the upper limit of the carbon content specification of a finished product of the steel, argon gas blowing is adopted to stir the bottom of a steel tank in the whole tapping process, the flow of the argon gas blowing is controlled within the range allowed by technical regulations according to large → medium → small, a large flow is adopted from the beginning of tapping to the end of tapping 1/3, a medium flow is adopted from the end of tapping 1/3 to 2/3, a small flow is adopted from the end of tapping 2/3 to the end of tapping, alloy is added into the steel tank when the end of tapping 1/3, and the carbon-oxygen reaction is inhibited prematurely due to early addition of the alloy, so the carbon reduction effect in the tapping.
In order to overcome the defects and shortcomings of the prior art, the invention adopts the specific technical scheme that the method comprises the following steps:
the method comprises the following steps: determining the control target of the carbon content of the end-point molten steel of the converter according to the requirement of the carbon content of the finished product of the steel grade, wherein the carbon content of the end-point molten steel of the converter is controlled to be lower than the upper limit of the carbon content of the finished product of the steel grade by 0.010-0.020%, namely if the carbon content [ C ] of the finished product of the steel grade is less than or equal to 0.070%, the carbon content [ C ] of the end-point molten steel of the converter is controlled to be 0.050-; if the carbon content [ C ] of the steel type finished product is less than or equal to 0.060 percent, controlling the carbon content [ C ] of the converter end point to be 0.040 to 0.050 percent;
step two: during the tapping process of the converter, bottom blowing argon is adopted for stirring in the whole steel tank, the flow of the bottom blowing argon is within the range allowed by technical specifications, bottom blowing is adopted at a first flow rate from the beginning of tapping to the end of tapping at 4/5, and bottom blowing is adopted at a second flow rate from the end of tapping at 4/5 to the end of tapping;
step three: when the steel is tapped 3/4, alloy is added into the steel tank, is aligned with the steel flow and is added at the impact part of the steel flow, so as to promote the alloy to rapidly react with the molten steel and be melted in the molten steel;
step four: after tapping, the molten steel is stirred for 1 minute in an argon blowing station by bottom blowing argon with third flow, and then is conveyed to an LF furnace for refining
Preferably, the first flow rate is greater than the second flow rate.
Preferably, the third flow rate is greater than the second flow rate and less than the first flow rate.
Preferably, the steel grade is SPHC.
Preferably, the steel grade is SAE 1006B.
Preferably, the flow range of the bottom-blowing argon gas flow is 6-24 m3/h。
Preferably, the flow range of the first flow is 7-8 m3/h。
Preferably, the flow range of the second flow is 22-23 m3/h。
Preferably, the flow range of the third flow is 14-15 m3/h。
Preferably, the alloy is an aluminum-iron alloy.
(III) advantageous effects
The invention provides a method for controlling the carbon content of molten steel. The method has the following beneficial effects:
(1) the invention properly improves the carbon content of the end-point molten steel when the low-carbon steel grade is produced by the converter, reduces the pressure of drawing low carbon by the converter, effectively reduces the oxidability of the molten steel of the converter and the TFe content in the end-point slag, reduces the loss of metallic iron and improves the slag splashing furnace protection effect.
(2) The [ C ] in the molten steel is controlled by optimizing the tapping process of the converter]And [ O ] in molten steel]The further reaction generates { CO } gas to be discharged, and the [ C ] in the molten steel is discharged]And [ O ]]Simultaneously, the carbon content requirement of the LF refining furnace in the next procedure on the primary molten steel is met, the carbon content requirement of the finished steel products is further met, the yield of the alloy aluminum is improved, and the deoxidation product Al is reduced2O3The total amount improves the quality of the molten steel.
(3) Through the implementation of the invention, the TFe content in the converter end-point slag is averagely reduced by 3.5 percent, the consumption of aluminum and iron is averagely reduced by 0.23Kg/t, and the total of the two items is reduced by 9.08 yuan/t.
Drawings
FIG. 1 is a flow chart of a low-carbon steel production process;
FIG. 2 is a schematic view of the control of the conventional tapping process of low-carbon steel;
FIG. 3 is a schematic view of the tapping process control of the low carbon steel of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The implementation steps and the operational control points of the invention are further explained by the following examples of smelting low-carbon steel in a 120t converter. The embodiment is a 120t converter, but the invention is not limited to the 120t converter, but is applicable to converters with all tonnages.
Example 1
The charging amount of the low-carbon steel SPHC smelted by the converter is 128.0t, wherein the molten iron is 103.0t, the scrap steel is 25.0t, the finished product of the steel requires the carbon content [ C ] to be less than or equal to 0.070% according to the specification, the primary molten steel requires the carbon content [ C ] to be less than or equal to 0.050% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of the aluminum-iron is 500 kg.
Step 1: and determining the control target of the carbon content of the end-point molten steel of the converter according to the requirement of the carbon content of the finished product of the steel grade to be smelted, wherein the carbon content of the end-point molten steel of the converter is controlled to be 0.010-0.020% lower than the upper limit of the carbon content of the finished product of the steel grade, the upper limit of the carbon content of the finished product of the SPHC steel grade is 0.070%, the control target of the end-point carbon content [ C ] of the converter is 0.050-0.060%, and the actual value of the end-point carbon.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 22m from tapping to 4/53H, large-flow bottom blowing, wherein 8m is adopted from steel tapping 4/5 to the end of steel tapping3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after the tapping is finished, the molten steel isArgon blowing station adopts 15m3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
Example 2
The charging amount of the low-carbon steel SPHC smelted by the converter is 127.8t, wherein 104.0t of molten iron and 23.8.0t of scrap steel are charged, the specification of the components of the finished steel product requires that the carbon content [ C ] is less than or equal to 0.070%, the components of the primary molten steel require that [ C ] is less than or equal to 0.050% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of aluminum and iron is 500 kg.
Step 1: and determining the control target of the carbon content of the end-point molten steel of the converter according to the requirement of the carbon content of the finished product of the steel grade to be smelted, wherein the carbon content of the end-point molten steel of the converter is controlled to be 0.010-0.020% lower than the upper limit of the carbon content of the finished product of the steel grade, the upper limit of the carbon content of the finished product of the SPHC steel grade is 0.070%, the control target of the carbon content [ C ] of the end-point molten steel of the converter is 0.050-0.060%, and the actual value of.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 22m from tapping to 4/53H, large-flow bottom blowing, wherein 8m is adopted from steel tapping 4/5 to the end of steel tapping3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after tapping, the molten steel is 15m in an argon blowing station3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
Example 3
The charging amount of the low-carbon steel SPHC smelted by the converter is 128.3t, wherein 103.5t of molten iron and 24.8.0t of scrap steel are charged, the specification of the components of the finished steel product requires that the carbon content [ C ] is less than or equal to 0.070%, the components of the primary molten steel require that [ C ] is less than or equal to 0.050% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of the aluminum-iron is 500 kg.
Step 1: and determining the control target of the carbon content of the end-point molten steel of the converter according to the requirement of the carbon content of the finished product of the steel grade to be smelted, wherein the carbon content of the end-point molten steel of the converter is controlled to be 0.010-0.020% lower than the upper limit of the carbon content of the finished product of the steel grade, the upper limit of the carbon content of the finished product of the SPHC steel grade is 0.070%, the control target of the end-point carbon content [ C ] of the converter is 0.050-0.060%, and the actual value of the end-point carbon.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 22m from tapping to 4/53H, large-flow bottom blowing, wherein the steel is discharged from 4/5 to 7m after the steel is discharged3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after tapping, the molten steel is 15m in an argon blowing station3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
Example 4
The converter smelting low carbon steel grade SAE1006B, the loading amount is 128.5t, wherein 103.50t molten iron and 25.0t scrap steel, the specification of the components of the steel grade finished product requires that the carbon content [ C ] is less than or equal to 0.060%, the components of the primary molten steel require that [ C ] is less than or equal to 0.040% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of aluminum-iron is 450 kg.
Step 1: and determining the control target of the carbon content of the molten steel at the end point of the converter according to the requirement of the carbon content of the finished product of the steel grade to be smelted, wherein the carbon content of the molten steel at the end point of the converter is controlled to be 0.010-0.020% lower than the upper limit of the carbon content of the finished product of the steel grade, the upper limit of the carbon content of the finished product of the SAE1006B steel grade is 0.060%, the control target of the carbon content [ C ] at the end point of the converter is 0.040-0.050%, and the actual value of the.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 23m from the beginning of tapping to the time of tapping to 4/53H, large-flow bottom blowing, wherein the steel is discharged from 4/5 to 7m after the steel is discharged3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after tapping, the molten steel is 15m in an argon blowing station3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
Example 5
The charging amount of the converter smelting low-carbon steel grade SAE1006B is 128.6t, wherein the molten iron is 104.1t, the scrap steel is 24.5.0t, the specification of the components of the finished product of the steel grade requires that the carbon content [ C ] is less than or equal to 0.060%, the components of the primary molten steel require that [ C ] is less than or equal to 0.040% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of aluminum-iron is 450 kg.
Step 1: and determining the control target of the carbon content of the molten steel at the end point of the converter according to the requirement of the carbon content of the finished product of the steel grade to be smelted, wherein the carbon content of the molten steel at the end point of the converter is controlled to be 0.010-0.020% lower than the upper limit of the carbon content of the finished product of the steel grade, the upper limit of the carbon content of the finished product of the SAE1006B steel grade is 0.060%, the control target of the carbon content [ C ] at the end point of the converter is 0.040-0.050%, and the actual value of.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 23m from the beginning of tapping to the time of tapping to 4/53H, large-flow bottom blowing, wherein 8m is adopted from steel tapping 4/5 to the end of steel tapping3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after tapping, the molten steel is 15m in an argon blowing station3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
Example 6
The charging amount of the converter smelting low-carbon steel grade SAE1006B is 128.2t, wherein the molten iron is 104.3t, the scrap steel is 23.9.0t, the specification of the components of the finished product of the steel grade requires that the carbon content [ C ] is less than or equal to 0.060%, the components of the primary molten steel require that [ C ] is less than or equal to 0.040% (based on the components of an argon blowing station), only aluminum-iron alloy is added in the tapping process, and the adding amount of aluminum-iron is 450 kg.
Step 1: and determining a control target of the carbon content of the molten steel at the end point of the converter according to the requirement of the finished carbon of the steel grade to be smelted, wherein the carbon content of the molten steel at the end point of the converter is controlled to be 0.01-0.02 percent lower than the upper limit of the carbon content of the finished steel grade, the upper limit of the carbon content of the finished SPHC steel grade is 0.060 percent, the control target of the carbon content [ C ] at the end point of the converter is 0.040-0.050 percent, and the actual value of the carbon content at the end point of the converter.
Step 2: in the tapping process of the converter, the whole process of stirring by blowing argon from the bottom of the steel tank is adopted, and the technical specification requirement of the flow of the argon from the bottom is 6-24 m3H, 22m from tapping to 4/53H, large-flow bottom blowing, wherein the steel is discharged from 4/5 to 7m after the steel is discharged3Low flow bottom blowing.
And step 3: at the time of tapping 3/4, alloy is added to the steel pot, aligned with the stream, at the point of impact of the stream to promote rapid reaction with and melting in the molten steel.
And 4, step 4: after tapping, the molten steel is 15m in an argon blowing station3And/h, stirring for 1 minute by middle-flow bottom blowing argon, and then conveying to an LF furnace for refining.
The following table shows the data of the above examples of this patent in comparison with the data of conventional control:
as can be seen from the data listed in the table above, the invention effectively reduces the oxidability of molten steel and obviously reduces the TFe content in the converter end slag by properly increasing the end-point molten steel carbon content when the converter produces low-carbon steel; the [ C ] in the molten steel and the [ O ] in the molten steel are further reacted to generate { CO } gas to be discharged through the optimized control of the converter tapping process, the [ C ] and the [ O ] in the molten steel are simultaneously reduced, the carbon content requirement of the LF refining furnace in the next procedure on the primary refined molten steel is met, the carbon content requirement of steel type finished products is further met, the yield of the alloy aluminum is improved, and the content of Als in the steel is obviously improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for controlling the carbon content of molten steel is characterized in that: the method comprises the following steps:
the method comprises the following steps: determining the control target of the carbon content of the end-point molten steel of the converter according to the requirement of the carbon content of the finished product of the steel grade, wherein the carbon content of the end-point molten steel of the converter is controlled to be lower than the upper limit of the carbon content of the finished product of the steel grade by 0.010-0.020%, namely if the carbon content [ C ] of the finished product of the steel grade is less than or equal to 0.070%, the carbon content [ C ] of the end-point molten steel of the converter is controlled to be 0.050-; if the carbon content [ C ] of the steel type finished product is less than or equal to 0.060 percent, controlling the carbon content [ C ] of the converter end point to be 0.040 to 0.050 percent;
step two: during the tapping process of the converter, bottom blowing argon is adopted for stirring in the whole steel tank, the flow of the bottom blowing argon is within the range allowed by technical specifications, bottom blowing is adopted at a first flow rate from the beginning of tapping to the end of tapping at 4/5, and bottom blowing is adopted at a second flow rate from the end of tapping at 4/5 to the end of tapping;
step three: when the steel is tapped 3/4, alloy is added into the steel tank, is aligned with the steel flow and is added at the impact part of the steel flow, so as to promote the alloy to rapidly react with the molten steel and be melted in the molten steel;
step four: and after tapping, the molten steel is stirred for 1 minute in an argon blowing station by bottom blowing argon with a third flow rate, and then is conveyed to an LF furnace for refining.
2. The method for controlling carbon content in molten steel according to claim 1, wherein: the first flow rate is greater than the second flow rate.
3. The method for controlling carbon content in molten steel according to claim 1, wherein: the third flow rate is greater than the second flow rate and less than the first flow rate.
4. The method for controlling carbon content in molten steel according to claim 1, wherein: the steel grade is SPHC.
5. The method for controlling carbon content in molten steel according to claim 1, wherein: the steel grade is SAE 1006B.
6. The method for controlling carbon content in molten steel according to claim 3, wherein: the flow range of the bottom argon blowing flow is 6-24 m3/h。
7. The method for controlling carbon content in molten steel according to claim 6, wherein: the flow range of the first flow is 7-8 m3/h。
8. The method for controlling carbon content in molten steel according to claim 7, wherein: the flow range of the second flow is 22-23 m3/h。
9. The carbon content of molten steel according to claim 8A method of controlling a quantity, characterized by: the flow range of the third flow is 14-15 m3/h。
10. The method for controlling carbon content in molten steel according to claim 1, wherein: the alloy is an aluminum-iron alloy.
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| CN202011094011.2A CN112094987A (en) | 2020-10-14 | 2020-10-14 | Method for controlling carbon content of molten steel |
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| CN202011094011.2A CN112094987A (en) | 2020-10-14 | 2020-10-14 | Method for controlling carbon content of molten steel |
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| CN115449584A (en) * | 2022-09-21 | 2022-12-09 | 马鞍山钢铁股份有限公司 | Control method for carbon content of low-carbon steel |
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