CN102888490A - 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 the 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 the steel.Peritectic steel refers to that a series of steel grades in the scope of Peritectic Reaction occur easily carbon content in the Fe-C phasor, common steel grade such as Q235, these steel grades are the common steel grade of the huge market demand, in the phosphorus control scope 0.035%.Under the market environment of fierceness, reduce the molten steel phosphorus content, improve steel quality and can strengthen product competitiveness.Lifting along with ore price, for reducing cost, bring into use high-phosphorus iron ore, phosphorus rises to 0.015 ~ 0.030% scope but molten iron phosphorus height causes tapping, very easily cause finished product phosphorus to take off control in the phosphorization of follow-up link alloy, therefore can when not increasing cost, improve steel quality, like this dephosphorization technology be proposed 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, phosphorus was controlled at below 0.008% when the method was mentioned tapping, then in ladle, add dephosphorizing agent and quickened lime, after Argon is complete, carry out heated and stirred at refining furnace, carry out deoxidation alloying according to the steel grade needs to vacuum at last.The method is for the not high steel grade of some technology contents, and the 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 in the converter molten steel phosphorus content control less than 0.012%, the deep dephosphorization agent of packing in ladle first, again tapping; Carry out pushing off the slag control in the tapping process, and the molten steel in the ladle is carried out weak deoxidation treatment; After tapping finishes, in ladle, drop into the deep dephosphorization agent again; Then, carry out ladle argon-blown; At last, with the slag in the ladle device for removing slag removing ladle.This technique is after tapping control phosphorus content is less than 0.012%, carry out again dephosphorization in the 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 set up at last the ladle device for removing slag, increased the ordinary steel cost of water treatment.
Summary of the invention
Technical problem to be solved by this invention just provides the weak dephosphorizing method in a kind of peritectic steel argon station, the method is peritectic steel mainly for smelting steel grade, phosphorus content is the molten steel of 0.015 ~ 0.030% scope in the converter tapping molten steel, carry out weak dephosphorization at the argon station, phosphorus content is reduced by 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, add the mid-carbon fe-mn of 0.4 ~ 0.75kg/ ton in the ladle by the molten steel amount, when liquid steel temperature reaches 1660 ~ 1685 ℃, begin tapping;
2) after the tapping, in ladle, add 2 ~ 4kg/ ton metallurgy lime by the molten steel amount, after adding lime, press the refining agent that the molten steel amount evenly adds 1 ~ 3kg/ ton in the ladle, molten steel goes out after 1/3, add lime and refining agent, in the whole tapping process steel ladle bottom argon blowing flow is transferred to 100 ~ 150NL/min simultaneously;
3) with step 2) in molten steel be transported to the argon station, press argon flow amount 50 ~ 100NL/min, blowing argon gas 5 ~ 10min, be 0.020% as correction value by the content of aluminium in the molten steel, to decide the aluminium content value and float downward and 0.020% evenly add the aluminum steel deoxidation of 0 ~ 4kg/ ton as actual value by tap, behind calm 2 ~ 3min, be 0.01% to be correction value by the content of carbon in the molten steel, float downward 0.01% for target value by limit in this steel grade carbon content values, evenly add the carbon line of 0 ~ 1kg/ ton by tap;
4) then by the mid-carbon fe-mn of the even adding of tap 0 ~ 5kg/ ton and the ferro-silico-manganese of 0 ~ 5kg/ ton, after having added, calm 2 ~ 3min presses the evenly aluminum steel of adding 0 ~ 3kg/ ton of tap again, and after the adjustment temperature, upper continuous casting direct pouring obtains peritectic steel.
Further, the weight percentage of phosphorus is 0.010 ~ 0.020% in the described peritectic steel.
Again further, during described tapping, blow end point carbon weight percentage is 0.03% ~ 0.05% in the converter.
Again further, in the described step 3), by the evenly aluminum steel deoxidation of adding 1 ~ 3kg/ ton of tap, evenly add the carbon line of 0.5 ~ 1kg/ ton by the ton tap.
Again further, in the described step 4), 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 by tap.
Again further, described step 2) in, Al and SiO in the refining agent
2Weight ratio=3: 1.
Principle of work:
Operational path is selected converter tapping-argon station alloying-continuous casting route, reduces the molten steel phosphorus content, improves steel quality, is chosen in the argon station molten steel is carried out weak dephosphorization.Both guaranteed at the argon station molten steel to be carried out weak dephosphorization, and can guarantee again the molten steel composition regulation and control accurately, especially Als content becomes difficult point.Because the aluminium mechanism of deciding of production scene is after even oxygen level of measuring in the molten steel of oxygen decided in use, then to use long-pending conversion of alumina to draw aluminium content.After lime and refining agent were used in the argon station, the refining agent of adding caused easily that error appears in oxygen level in the molten steel, affects to decide the aluminium accuracy.Simultaneously, the converter tapping carbon content control, need to add at the argon station carbon and process for the scope of peritectic steel 0.08-0.15% at 0.03-0.05%.Equally, after the argon station adds lime and refining agent, decide carbon for molten steel and also error can occur.Therefore the way that adopts empirical correction to weak dephosphorization after molten steel carry out Als content, then the C normalization press correction value and is added alloy and finely tune composition, its technical characterictic is as follows:
(1) after use the method, molten steel phosphorus was than tapping phosphorus minimizing 0.005-0.010% after processed at the argon station.
(2) after use the method, can improve the high phosphorus hot metal usage quantity, in smelting process, 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%.
When 2) the present invention used high phosphorus hot metal to smelt peritectic steel, converter steel iron charge consumption remained on below the 1102kg/ ton.
3) a plurality of steel grade phosphorus of peritectic steel of the present invention take off control and change the original sentence to rate and descend 5%, use the present invention after, molten steel phosphorus reduced 0.005-0.010% than tapping phosphorus after processed at the argon station.
4) the present invention improves the 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, further illustrate main contents of the present invention below in conjunction with specific embodiment, but content of the present invention not only is confined to following examples.
Embodiment 1:
The target steel grade is Q235, and the molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, add the mid-carbon fe-mn of 100kg in the ladle, when liquid steel temperature reaches 1670 ℃, when blow end point carbon weight percentage is 0.03% ~ 0.05% in the converter, begin tapping;
2) after the tapping, evenly add the lime of 600kg in the ladle by tap, add lime after, the refining agent that evenly adds 300kg by tap in the ladle, molten steel goes out after 1/3, adds lime and refining agent, in the whole tapping process steel ladle bottom argon blowing flow is transferred to 150NL/min simultaneously;
3) with step 2) in the molten steel of tapping be transported to the argon station, press argon flow amount 100NL/min, blowing argon gas 5min, be 0.020% as correction value by the content of aluminium in the molten steel, floating downward and 0.020% evenly add the aluminum steel deoxidation of 200kg as actual value by tap deciding the aluminium content value, behind the calm 3min, is 0.01% to be correction value by the content of carbon in the molten steel, float downward 0.01% for target value by limit in this steel grade carbon content values, evenly add the carbon line of 100kg by tap;
4) then evenly add the mid-carbon fe-mn of 200kg and the ferro-silico-manganese of 600kg by tap, after having added, calm 3min evenly adds the aluminum steel of 200kg again by tap, adjust temperature after, upper continuous casting direct pouring obtains peritectic steel.
Wherein, in present embodiment and following examples, Al and SiO in the refining agent
2Weight ratio=3: 1; The manganese weight percentage is 40% in the mid-carbon fe-mn, and the carbon weight percentage is 5%.The weight percentage of silicon is 20% in the ferro-silico-manganese, and the manganese weight percentage is 30%.Aluminum steel is 100% Als.
Embodiment 2
The target steel grade is Q345, and the molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, add the mid-carbon fe-mn of 150kg in the ladle, when liquid steel temperature reaches 1685 ℃, when blow end point carbon weight percentage is 0.03% ~ 0.05% in the converter, begin tapping;
2) after the tapping, evenly add the lime of 800kg in the ladle by tap, add lime after, the refining agent that evenly adds 600kg by tap in the ladle, molten steel goes out after 1/3, adds lime and refining agent, in the whole tapping process steel ladle bottom argon blowing flow is transferred to 100NL/min simultaneously;
3) with step 2) in the molten steel of tapping be transported to the argon station, press argon flow amount 50NL/min, blowing argon gas 10min, be 0.020% as correction value by the content of aluminium in the molten steel, floating downward and 0.020% evenly add the aluminum steel deoxidation of 600kg as actual value by tap deciding the aluminium content value, behind the calm 3min, is 0.01% to be correction value by the content of carbon in the molten steel, float downward 0.01% for target value by limit in this steel grade carbon content values, evenly add the carbon line of 200kg by tap;
4) then evenly add the mid-carbon fe-mn of 600kg and 1 ton ferro-silico-manganese by tap, after having added, calm 3min evenly adds the aluminum steel of 400kg again by tap, adjust temperature after, upper continuous casting direct pouring obtains peritectic steel.
Embodiment 3
The target steel grade is Q345 (BH), and the molten steel amount is 200 tons, and step is as follows:
1) before converter tapping, add the mid-carbon fe-mn of 80kg in the ladle, when liquid steel temperature reaches 1660 ℃, when blow end point carbon weight percentage is 0.03% ~ 0.05% in the converter, begin tapping;
2) after the tapping, evenly add the lime of 400kg in the ladle by tap, add lime after, the refining agent that evenly adds 200kg by tap in the ladle, molten steel goes out after 1/3, adds lime and refining agent, in the whole tapping process steel ladle bottom argon blowing flow is transferred to 120NL/min simultaneously;
3) with step 2) in the molten steel of tapping be transported to the argon station, press argon flow amount 80NL/min, blowing argon gas 8min, be 0.020% as correction value by the content of aluminium in the molten steel, floating downward and 0.020% evenly add the aluminum steel deoxidation of 800kg as actual value by tap deciding the aluminium content value, behind the calm 3min, is 0.01% to be correction value by the content of carbon in the molten steel, float downward 0.01% for target value by limit in this steel grade carbon content values, evenly add the carbon line of 100kg by tap;
4) then evenly add the ferro-silico-manganese of 100kg/ ton by tap, after having added, calm 3min evenly adds the aluminum steel of 100kg again by tap, adjust temperature after, upper continuous casting direct pouring obtains peritectic steel.
Claims (6)
1. the weak dephosphorizing method in peritectic steel argon station comprises the steps:
1) before converter tapping, add the mid-carbon fe-mn of 0.4 ~ 0.75kg/ ton in the ladle by the molten steel amount, when liquid steel temperature reaches 1660 ~ 1685 ℃, begin tapping;
2) after the tapping, in ladle, add 2 ~ 4kg/ ton metallurgy lime by the molten steel amount, after adding lime, press the refining agent that the molten steel amount evenly adds 1 ~ 3kg/ ton in the ladle, molten steel goes out after 1/3, add lime and refining agent, in the whole tapping process steel ladle bottom argon blowing flow is transferred to 100 ~ 150NL/min simultaneously;
3) with step 2) in molten steel be transported to the argon station, press argon flow amount 50 ~ 100NL/min, blowing argon gas 5 ~ 10min, be 0.020% as correction value by the content of aluminium in the molten steel, to decide the aluminium content value and float downward and 0.020% evenly add the aluminum steel deoxidation of 0 ~ 4kg/ ton as actual value by tap, behind calm 2 ~ 3min, be 0.01% to be correction value by the content of carbon in the molten steel, float downward 0.01% for target value by limit in this steel grade carbon content values, evenly add the carbon line of 0 ~ 1kg/ ton by tap;
4) then by the mid-carbon fe-mn of the even adding of tap 0 ~ 5kg/ ton and the ferro-silico-manganese of 0 ~ 5kg/ ton, after having added, calm 2 ~ 3min presses the evenly aluminum steel of adding 0 ~ 3kg/ ton of tap again, and after the adjustment temperature, upper continuous casting direct pouring obtains peritectic steel.
2. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, it is characterized in that: the weight percentage of phosphorus is 0.010 ~ 0.020% in the described peritectic steel.
3. the weak dephosphorizing method in peritectic steel argon according to claim 1 station, it is characterized in that: during described tapping, the interior blow end point carbon weight percentage of converter is 0.03% ~ 0.05%.
4. the weak dephosphorizing method in peritectic steel argon station according to claim 1 is characterized in that: in the described step 3), by the evenly aluminum steel deoxidation of adding 1 ~ 3kg/ ton of tap, evenly add the carbon line of 0.5 ~ 1kg/ ton by the ton tap.
5. the weak dephosphorizing method in peritectic steel argon station according to claim 1 is characterized in that: in the described step 4), 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 by tap.
6. the weak dephosphorizing method in peritectic steel argon according to claim 1 station is characterized in that: described step 2), and Al and SiO in the refining agent
2Weight ratio=3: 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789859A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | Method for producing peritectic steel by using medium-thin slab continuous caster |
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| 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 |
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| 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 (1)
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| 殷享兵等: "吹氩站多功能精炼技术的开发", 《炼钢》 * |
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| CN104789859A (en) * | 2015-03-27 | 2015-07-22 | 山东钢铁股份有限公司 | Method for producing peritectic steel by using medium-thin slab continuous caster |
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Effective date of registration: 20170712 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20140122 Termination date: 20181024 |