CN102888490B - Method for weak dephosphorization of peritectic steel in argon station - Google Patents
Method for weak dephosphorization of peritectic steel in argon station Download PDFInfo
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Abstract
The invention discloses a method for the weak dephosphorization of peritectic steel in an argon station. In the method, a production route of converter tapping, argon station alloying and then continuous casting is selected, the phosphorus content of molten steel is reduced, and the quality of the molten steel is improved; and the molten steel is subjected to weak dephosphorization in an argon station. The molten steel subjected to weak dephosphorization is subjected to Als content and C content correction through an empirical correction valve method, and then, alloy fine adjustment components are added according to the correction values. According to the invention, by smelting peritectic steel with high-phosphorus molten iron, the success rate of composition controlling is kept above 90%; and when the peritectic steel is smelted with the high-phosphorus molten iron, the consumption of converter steel and iron materials is kept below 1102 kg per ton. The invention can increase the usage amount of the high-phosphorus molten iron and simultaneously avoid the increase of the consumption of converter active lime in the smelting process.
Description
Technical field
The present invention relates to ferrous metallurgy field, be specifically related to the weak dephosphorizing method in a kind of peritectic steel argon station.
Background technology
Phosphorus plays a part cold short in steel, is harmful element in steel.Peritectic steel refers to that a series of steel grades in the scope of Peritectic Reaction easily occur carbon content in Fe-C phasor, and common steel grade is as Q235, and these steel grades are the common steel grade of the huge market demand, in phosphorus control scope 0.035%.Under fierce market environment, reduce molten steel phosphorus content, improve steel quality and can strengthen product competitiveness.Lifting along with ore price, for reducing costs, bring into use high-phosphorus iron ore, but the high phosphorus that causes tapping of molten iron phosphorus rises to 0.015～0.030% scope, in the phosphorization of follow-up link alloy, very easily cause the de-control of finished product phosphorus, therefore can when not increasing cost, improve steel quality, like this dephosphorization technology be proposed to higher requirement.Publication number is that the Chinese invention patent of CN02115419.8 discloses a kind of method of producing the control phosphorus of ultra-low phosphoretic steel, when the method is mentioned tapping, phosphorus is controlled at below 0.008%, then in ladle, add dephosphorizing agent and quickened lime, after Argon is complete, at refining furnace, carry out heated and stirred, finally according to steel grade, need to arrive vacuum and carry out deoxidation alloying.The method is for the not high steel grade of some technology contents, and art breading route is long, and production cost is high.Publication number is that the Chinese invention patent of CN200710157922.3 discloses a kind of smelting method of low-phosphorus steel, and the method is mentioned phosphorus content control in converter molten steel and is less than 0.012%, first in ladle, packs deep dephosphorization agent into, then taps; In tapping process, carry out pushing off the slag control, and the molten steel in ladle is carried out to weak deoxidation treatment; After tapping finishes, then drop into deep dephosphorization agent in ladle; Then, carry out ladle argon-blown; Finally, with ladle device for removing slag, remove the slag in ladle.This technique is controlled phosphorus content in tapping and is less than after 0.012%, carry out again dephosphorization in ladle, belong to the dephosphorizing process of producing ultra-low phosphoretic steel water, do not belong to and produce common steel grade use molten steel category, and finally set up ladle device for removing slag, increased ordinary steel cost of water treatment.
Summary of the invention
Technical problem to be solved by this invention is just to provide the weak dephosphorizing method in a kind of peritectic steel argon station, the method is peritectic steel mainly for smelting steel grade, in converter tapping molten steel, phosphorus content is the molten steel of 0.015～0.030% scope, at argon station, carry out weak dephosphorization, phosphorus content is reduced to 0.005～0.010%, improve steel quality.
For solving the problems of the technologies described above, the invention provides the weak dephosphorizing method in a kind of peritectic steel argon station, comprise the steps:
1), before converter tapping, by molten steel amount, to the mid-carbon fe-mn that adds 0.4～0.75kg/ ton in ladle, when liquid steel temperature reaches 1660～1685 ℃, start tapping;
2) start after tapping, by molten steel amount, in ladle, add 2～4kg/ ton metallurgy lime, add after lime, by molten steel amount to the refining agent that evenly adds 1～3kg/ ton in ladle, molten steel goes out after 1/3, add lime and refining agent, in whole tapping process, steel ladle bottom argon blowing flow is adjusted to 100～150NL/min simultaneously;
3) by step 2) in molten steel be transported to argon station, press argon flow amount 50～100NL/min, blowing argon gas 5～10min, by the content of aluminium in molten steel, be 0.020% as correction value, using determining aluminium content value, floating downward and 0.020% as actual value, by tap, evenly add the aluminum steel deoxidation of 0～4kg/ ton, after calm 2～3min, is 0.01% to be correction value by the content of carbon in molten steel, by limit in this steel grade carbon content values, float downward 0.01% for target value, by tap, evenly add the carbon line of 0～1kg/ ton;
4) then by tap, evenly add the mid-carbon fe-mn of 0～5kg/ ton and the ferro-silico-manganese of 0～5kg/ ton, after having added, calm 2～3min, then by tap, evenly add the aluminum steel of 0～3kg/ ton, and to adjust after temperature, upper continuous casting direct pouring, obtains peritectic steel.
Further, in described peritectic steel, the weight percentage of phosphorus is 0.010～0.020%.
Again further, during described tapping, in converter, blow end point carbon weight percentage is 0.03%～0.05%.
Again further, in described step 3), by tap, evenly add the aluminum steel deoxidation of 1～3kg/ ton, by ton tap, evenly add the carbon line of 0.5～1kg/ ton.
Again further, in described step 4), by tap, evenly add the mid-carbon fe-mn of 1～3kg/ ton and the ferro-silico-manganese of 1～3kg/ ton, by tap, evenly add the aluminum steel of 1～3kg/ ton.
Again further, described step 2) in, Al and SiO in refining agent
2weight ratio=3: 1.
Principle of work:
Operational path is selected converter tapping-argon station alloying-continuous casting route, reduces molten steel phosphorus content, improves steel quality, is chosen in argon station molten steel is carried out to weak dephosphorization.Both guaranteed, at argon station, molten steel is carried out to weak dephosphorization, and can guarantee again molten steel composition regulation and control accurately, especially Als content becomes difficult point.Because the aluminium mechanism of determining of production scene is, use and determine the even head of oxygen and measure after the oxygen level in molten steel, then use the long-pending conversion of alumina to draw aluminium content.At argon station, use after lime and refining agent, the refining agent adding easily causes steel oxygen content in water to occur error, and aluminium accuracy is determined in impact.Meanwhile, converter tapping carbon content control, at 0.03-0.05%, for the scope of peritectic steel 0.08-0.15%, need to add at argon station carbon and process.Equally, at argon station, add after lime and refining agent, for molten steel, determine carbon and also there will be error.Therefore the way that adopts empirical correction to weak dephosphorization after molten steel carry out Als content, C normalization, then adds alloy fine setting composition by correction value, its technical characterictic is as follows:
(1) use after the method, argon station is processed rear molten steel phosphorus and is reduced 0.005-0.010% than tapping phosphorus.
(2) use after the method, can improve high phosphorus hot metal usage quantity, in smelting process, do not increase converter quickened lime consumption simultaneously.
Advantage of the present invention:
1) the present invention uses high phosphorus hot metal smelting peritectic steel internal control hit rate to remain on more than 90%.
2), when the present invention uses high phosphorus hot metal to smelt peritectic steel, converter steel iron charge consumption remains on below 1102kg/ ton.
3) rate decline 5% is changed the original sentence in the de-control of a plurality of steel grade phosphorus of peritectic steel of the present invention, uses after the present invention, and after the processing of argon station, molten steel phosphorus reduces 0.005-0.010% than the phosphorus of tapping.
4) the present invention improves high phosphorus hot metal usage quantity, does not increase converter quickened lime consumption simultaneously in smelting process.
Embodiment
In order to explain better the present invention, below in conjunction with specific embodiment, further illustrate main contents of the present invention, but content of the present invention is not only confined to following examples.
Embodiment 1:
Target steel grade is Q235, and molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, in ladle, add the mid-carbon fe-mn of 100kg, when liquid steel temperature reaches 1670 ℃, when blow end point carbon weight percentage is 0.03%～0.05% in converter, start tapping;
2) start, after tapping, by tap, to the lime that evenly adds 600kg in ladle, to add after lime, by tap to the refining agent that evenly adds 300kg in ladle, molten steel goes out after 1/3, adds lime and refining agent, in whole tapping process, steel ladle bottom argon blowing flow is adjusted to 150NL/min simultaneously;
3) by step 2) in the molten steel of tapping be transported to argon station, press argon flow amount 100NL/min, blowing argon gas 5min, by the content of aluminium in molten steel, be 0.020% as correction value, using determining aluminium content value, floating downward and 0.020% as actual value, by tap, evenly add the aluminum steel deoxidation of 200kg, after calm 3min, is 0.01% to be correction value by the content of carbon in molten steel, by limit in this steel grade carbon content values, float downward 0.01% for target value, by tap, evenly add the carbon line of 100kg;
4) then by tap, evenly add the mid-carbon fe-mn of 200kg and the ferro-silico-manganese of 600kg, after having added, calm 3min, then by tap, evenly add the aluminum steel of 200kg, and to adjust after temperature, upper continuous casting direct pouring, obtains peritectic steel.
Wherein, in the present embodiment and following examples, Al and SiO in refining agent
2weight ratio=3: 1; In mid-carbon fe-mn, manganese weight percentage is 40%, and carbon weight percentage is 5%.; In ferro-silico-manganese, the weight percentage of silicon is 20%, and manganese weight percentage is 30%.Aluminum steel is 100% Als.
Embodiment 2
Target steel grade is Q345, and molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, in ladle, add the mid-carbon fe-mn of 150kg, when liquid steel temperature reaches 1685 ℃, when blow end point carbon weight percentage is 0.03%～0.05% in converter, start tapping;
2) start, after tapping, by tap, to the lime that evenly adds 800kg in ladle, to add after lime, by tap to the refining agent that evenly adds 600kg in ladle, molten steel goes out after 1/3, adds lime and refining agent, in whole tapping process, steel ladle bottom argon blowing flow is adjusted to 100NL/min simultaneously;
3) by step 2) in the molten steel of tapping be transported to argon station, press argon flow amount 50NL/min, blowing argon gas 10min, by the content of aluminium in molten steel, be 0.020% as correction value, using determining aluminium content value, floating downward and 0.020% as actual value, by tap, evenly add the aluminum steel deoxidation of 600kg, after calm 3min, is 0.01% to be correction value by the content of carbon in molten steel, by limit in this steel grade carbon content values, float downward 0.01% for target value, by tap, evenly add the carbon line of 200kg;
4) then by tap, evenly add the mid-carbon fe-mn of 600kg and the ferro-silico-manganese of 1 ton, after having added, calm 3min, then by tap, evenly add the aluminum steel of 400kg, and to adjust after temperature, upper continuous casting direct pouring, obtains peritectic steel.
Embodiment 3
Target steel grade is Q345 (BH), and molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, in ladle, add the mid-carbon fe-mn of 80kg, when liquid steel temperature reaches 1660 ℃, when blow end point carbon weight percentage is 0.03%～0.05% in converter, start tapping;
2) start, after tapping, by tap, to the lime that evenly adds 400kg in ladle, to add after lime, by tap to the refining agent that evenly adds 200kg in ladle, molten steel goes out after 1/3, adds lime and refining agent, in whole tapping process, steel ladle bottom argon blowing flow is adjusted to 120NL/min simultaneously;
3) by step 2) in the molten steel of tapping be transported to argon station, press argon flow amount 80NL/min, blowing argon gas 8min, by the content of aluminium in molten steel, be 0.020% as correction value, using determining aluminium content value, floating downward and 0.020% as actual value, by tap, evenly add the aluminum steel deoxidation of 800kg, after calm 3min, is 0.01% to be correction value by the content of carbon in molten steel, by limit in this steel grade carbon content values, float downward 0.01% for target value, by tap, evenly add the carbon line of 100kg;
4) then by tap, evenly add the ferro-silico-manganese of 100kg/ ton, after having added, calm 3min, then by tap, evenly add the aluminum steel of 100kg, and to adjust after temperature, upper continuous casting direct pouring, obtains peritectic steel.
Claims (5)
1. the weak dephosphorizing method in peritectic steel argon station, comprises the steps:
1), before converter tapping, by molten steel amount, to the mid-carbon fe-mn that adds 0.4～0.75kg/ ton in ladle, when liquid steel temperature reaches 1660～1685 ℃, start tapping;
2) start after tapping, by molten steel amount, in ladle, add 2～4kg/ ton metallurgy lime, add after lime, by molten steel amount to the refining agent that evenly adds 1～3kg/ ton in ladle, molten steel goes out after 1/3, adds lime and refining agent, in whole tapping process, steel ladle bottom argon blowing flow is adjusted to 100～150NL/min simultaneously, wherein, Al and SiO in refining agent
2weight ratio=3 ︰ 1;
3) by step 2) in molten steel be transported to argon station, press argon flow amount 50～100NL/min, blowing argon gas 5～10min, by the content of aluminium in molten steel, be 0.020% as correction value, using determining aluminium content value, floating downward and 0.020% as actual value, by tap, evenly add the aluminum steel deoxidation of 0～4kg/ ton, after calm 2～3min, is 0.01% to be correction value by the content of carbon in molten steel, by limit in this steel grade carbon content values, float downward 0.01% for target value, by tap, evenly add the carbon line of 0～1kg/ ton;
4) then by tap, evenly add the mid-carbon fe-mn of 0～5kg/ ton and the ferro-silico-manganese of 0～5kg/ ton, after having added, calm 2～3min, then by tap, evenly add the aluminum steel of 0～3kg/ ton, and to adjust after temperature, upper continuous casting direct pouring, obtains peritectic steel.
2. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, is characterized in that: in described peritectic steel, the weight percentage of phosphorus is 0.010～0.020%.
3. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, is characterized in that: during described tapping, in converter, blow end point carbon weight percentage is 0.03%～0.05%.
4. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, is characterized in that: in described step 3), evenly add the aluminum steel deoxidation of 1～3kg/ ton by tap, evenly add the carbon line of 0.5～1kg/ ton by ton tap.
5. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, is characterized in that: in described step 4), by tap, evenly add the mid-carbon fe-mn of 1～3kg/ ton and the ferro-silico-manganese of 1～3kg/ ton, evenly add the aluminum steel of 1～3kg/ ton by tap.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240397A (en) * | 2008-02-29 | 2008-08-13 | 南京钢铁股份有限公司 | Converter-RH-LF-continuous casting technique for producing pipe line steel |
| CN101550469A (en) * | 2008-04-05 | 2009-10-07 | 廖辉明 | Operating method for using low- or mediate-silico-manganese ferroalloy in process of temperature-adjusting deoxidation alloying for steel-making |
| CN102080181A (en) * | 2010-12-21 | 2011-06-01 | 南阳汉冶特钢有限公司 | Low-alloy Q345D thick plate produced without adding micro-alloy elements and production method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240397A (en) * | 2008-02-29 | 2008-08-13 | 南京钢铁股份有限公司 | Converter-RH-LF-continuous casting technique for producing pipe line steel |
| CN101550469A (en) * | 2008-04-05 | 2009-10-07 | 廖辉明 | Operating method for using low- or mediate-silico-manganese ferroalloy in process of temperature-adjusting deoxidation alloying for steel-making |
| CN102080181A (en) * | 2010-12-21 | 2011-06-01 | 南阳汉冶特钢有限公司 | Low-alloy Q345D thick plate produced without adding micro-alloy elements and production method thereof |
Non-Patent Citations (2)
| Title |
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| 吹氩站多功能精炼技术的开发;殷享兵等;《炼钢》;20080630;第24卷(第3期);全文 * |
| 殷享兵等.吹氩站多功能精炼技术的开发.《炼钢》.2008,第24卷(第3期),第17-20页. |
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