CN102358912A - Convertor smelting technology method for producing low-phosphorous steel - Google Patents
Convertor smelting technology method for producing low-phosphorous steel Download PDFInfo
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- CN102358912A CN102358912A CN2011103402949A CN201110340294A CN102358912A CN 102358912 A CN102358912 A CN 102358912A CN 2011103402949 A CN2011103402949 A CN 2011103402949A CN 201110340294 A CN201110340294 A CN 201110340294A CN 102358912 A CN102358912 A CN 102358912A
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Abstract
The invention relates to the technical field f convertor steel making in metallurgy industries, in particular to a method for smelting low-phosphorous steel through combined steel-tapping slag-left and double slag process technology, which aims at providing convertor technology for producing the low-phosphorous steel. The method prolongs previous dephosphorization blowing time, thereby prolonging reaction time of steel slag in a previous blowing stage, improving reaction temperature of dephosphorization steel slag in previous blowing, improving dynamics and thermodynamics conditions of steel slag reaction, improving dephosphorization effect in previous blowing and enabling phosphorus in steel liquid to be absorbed in slag as much as possible. Slag with high P2O5 content is poured out of a convertor so as to reduce phosphorus content of the whole convertor system, providing favorable conditions for dephosphorization in a later decarburization blowing stage and achieving the purpose of producing the low-phosphorous steel. Compared with other methods for producing the low-phosphorous steel, the method for producing the low-phosphorous steel has the advantages of being simple in operation methods, low in cost, easy to obtain and the like.
Description
Technical field
The present invention relates to converter steelmaking technical field in the metallurgy industry, relate generally to and a kind ofly adopt tapping to stay the smelting of slag and double slag process to remove phosphorus in the molten steel
Produce the converter smelting process method of low phosphoretic steel
Background technology
Phosphorus is a kind of easy segregation element in steel, when phosphorus content in the steel greater than 0.015% the time, the segregation of phosphorus sharply increases; And impel segregation line hardness to increase; Simultaneously, phosphorus also worsens the welding property of steel, significantly reduces the low-temperature impact toughness of steel; Improve the brittle transition temperature of steel, make steel that cold short phenomenon take place easily.General high-quality steel all has the strict upper limit to phosphorus content, and great majority require phosphorus content to be lower than 0.015%, and Cryogenic Steel pipe, special deep drawing steel etc. require that phosphorus content is lower than 0.010% in the steel.
Tradition " three take off " technology is at first to locate molten iron is carried out the desiliconization pre-treatment at blast furnace iron outlet groove etc.; In iron ladle or torpedo tank car, carry out desulfurization and dephosphorization pre-treatment or dephosphorization and desulfurization processing simultaneously then respectively, again " three take off " back molten iron is carried out less-slag melting in top and bottom combined blown converter at last.The dephosphorization and desulfurization reaction vessel that this tradition " three take off " is handled is little, and reacting dynamics condition is bad, has the dead band; Be unfavorable for the carrying out of slag steel reaction, this kind treating processes temperature drop is big in addition, handles the back temperature drop greater than 100 ℃; The heat of Si, P oxidation is not utilized fully, causes calorific loss.
Nippon Steel in 2002 succeeds in developing it and is referred to as " MURC " technology, and main technological features comprises: (1) converter tapping stays slag; (2) adopt two slag blowing; (3) endpoint molten steel [P] content is controlled at below 0.02%.The MURC technology of Nippon Steel's exploitation, main purpose are to practice thrift lime, do not have finer research report to going deep into dephosphorization.
Summary of the invention
In order to address the above problem, the objective of the invention is to adopt tapping to stay slag and the low phosphoretic steel of double slag process converter steelmaking process production, realize controlling converter terminal molten steel phosphorus content through prolongation fs (dephosphorization stage) duration of blast and be lower than 0.010% target.
Technical scheme of the present invention is: a kind of converter smelting process method of producing low phosphoretic steel, this method adopt converter tapping to stay slag and converter double slag process smelting technology to combine, and go deep into dephosphorization.In the fs dephosphorizing process, adopt oxygen, lime, rhombspar and iron ore as dephosphorizing agent, institute's consumption is by tapping molten steel per ton, and flow of oxygen is 10～35Nm
3, lime consumption is 2～25kg, and the rhombspar consumption is 0～20kg, and the iron ore consumption is 2～25kg, and the fs duration of blast is 260～450 seconds, dephosphorization stage finishing blowing is outwelled 1/4～3/4 the higher dephosphorized slag of phosphorus content; Add lime steel 5～25kg per ton again in the subordinate phase blowing, rhombspar steel 0～20kg per ton, further dephosphorization, the endpoint molten steel phosphorus content that obtains is reduced to below 0.010%.
The present invention adopts tapping to stay slag; Can cut down the consumption of raw materials; Through the dephosphorization duration of blast of 260～450 second long period, make phosphorus long period reaction in dephosphorizing agent such as lime, iron ore and the molten steel, get in the slags to absorb more phosphorus; Finish to pour out a part of high phosphorus slag at the fs dephosphorization; Through the subordinate phase further dephosphorization that blows, converter terminal molten steel phosphorus content is reduced to below 0.010% then, has realized under the prerequisite of low raw material consumption, producing phosphorus content less than 0.010% low phosphoretic steel.
The molten iron initial stage phosphorus content weight percent that gets into converter is 0.06～0.10%.
The invention has the beneficial effects as follows: compare with the shorter dephosphorization duration of blast less than 260 seconds, the fs duration of blast extends to 260～450 seconds, has following advantage:
(1) temperature raises in the dephosphorization stage stove, and it is easy to change slag, increases dephosphorization active constituent contents such as lime, improves the dephosphorization effect in early stage.
(2) the slag-metal reaction time long, the phosphorus in the molten steel can be fully absorbed in the slag;
(3) slag temperature is higher, and is better mobile, favourable to fs finishing blowing deslagging.
Description of drawings
Fig. 1 is that the present invention handles phosphorus content and comparative example contrast synoptic diagram in the rear converter terminal point molten steel.
Embodiment
further specify technical scheme of the present invention below in conjunction with specific embodiment.
Experiment is carried out in 210 tons of top and bottom combined blown converters, and going into stove molten iron phosphorus content is 0.06～0.10 wt %, and the total Intake Quantity of molten iron and steel scrap is 210～250 tons.
Embodiment 1
The initial phosphorus content of molten iron [%P]=0.0785, temperature T=1305 ℃, the oxygen-supplying amount that blows early stage is 3900Nm
3, lime consumption is 2.5t, and the iron ore consumption is 2.0t, and the rhombspar consumption is 0.5t, and duration of blast is 340 seconds, early stage, dephosphorization finished P in the slag
2O
5Percentage composition 3.71, subordinate phase blowing add lime 2.0t again, rhombspar 1.5t, converter terminal molten steel [%P]=0.0089, temperature T=1689 ℃, finishing slag P
2O
5Percentage composition 1.66.
Embodiment 2
The initial phosphorus content of molten iron [%P]=0.0787, temperature T=1255 ℃, the oxygen-supplying amount that blows early stage is 3900Nm
3, lime consumption is 4.0t, and the iron ore consumption is 1.5t, and duration of blast is 345 seconds, and early stage, dephosphorization finished P in the slag
2O
5Percentage composition 3.60, subordinate phase blowing add lime 2.5t again, rhombspar 1.5t, converter terminal molten steel [%P]=0.0085, temperature T=1692 ℃, finishing slag P
2O
5Percentage composition 1.67.
Embodiment 3
The initial phosphorus content of molten iron [%P]=0.0804, temperature T=1281 ℃, the oxygen-supplying amount that blows early stage is 4000Nm
3, lime consumption is 3.0t, and the iron ore consumption is 1.0t, and the rhombspar consumption is 0.5t, and duration of blast is 368 seconds, early stage, dephosphorization finished P in the slag
2O
5Percentage composition 3.26, subordinate phase blowing add lime 2.5t again, rhombspar 2.0t, converter terminal molten steel [%P]=0.0061, temperature T=1658 ℃, finishing slag P
2O
5Percentage composition 1.79.
Comparative example
The initial phosphorus content of molten iron [%P]=0.0737, temperature T=1330 ℃, the oxygen-supplying amount that blows early stage is 3000Nm
3, lime consumption is 3.0t, and the iron ore consumption is 1.5t, and the rhombspar consumption is 0.5t, and duration of blast is 255 seconds, early stage, dephosphorization finished P in the slag
2O
5Percentage composition 2.71, subordinate phase blowing add lime 2.0t again, rhombspar 1.5t, converter terminal molten steel [%P]=0.0125, temperature T=1693 ℃, finishing slag P
2O
5Percentage composition 2.02.
Each data results of embodiment 1,2,3 and comparative example be listed in the table below 1 and table 2 in.Wherein test heat 1,2,3 and represented embodiment 1,2,3 respectively, experiment heat 4 has been represented comparative example.
Table 1 is gone into stove molten iron and endpoint molten steel phosphorus content, temperature contrast
Table 2 dephosphorization in early stage finishes P in slag and the converter terminal slag
2O
5The value contrast
| The experiment heat | Early stage, dephosphorization finished P in the slag 2O 5Percentage composition | P in the converter terminal slag 2O 5Percentage composition |
| 1 | 3.71 | 1.66 |
| 2 | 3.60 | 1.67 |
| 3 | 3.26 | 1.79 |
| 4 | 2.71 | 2.02 |
From table 2, can find out and compare P in the embodiment dephosphorized slag with comparative example
2O
5Content is higher, and the increase with the slag-metal reaction time is described, the phosphorus that absorbs in the slag can increase, and slag steel dephosphorisation reaction more trends towards balance.This part high phosphorus slag is poured out after the finishing blowing in early stage as far as possible, reduces the phosphorus content in the whole converter system, makes P in the converter terminal slag
2O
5Phosphorus content reduces in content and the molten steel, helps the production of low phosphoretic steel.
According to above each data, can obtain situation shown in the accompanying drawing 1.
Can find out with comparative example from accompanying drawing 1 and compare that embodiment prolongs dephosphorization duration of blast in early stage, [P] content is on the low side in the converter terminal steel, all less than 0.010%, satisfies the requirement to low phosphoretic steel phosphorus content.
Based on the present invention, when slag, two slag melting are stayed in the employing tapping, operate under the essentially identical situation at other, through prolonging dephosphorization duration of blast in early stage, can be used for producing low phosphoretic steel, this is the low phosphoretic steel method of a kind of not only simple effective but also economical and practical production.
Claims (1)
1. a converter smelting process method of producing low phosphoretic steel is characterized in that, this method adopts converter tapping to stay slag and converter double slag process smelting technology to combine, and gos deep into dephosphorization; In the fs dephosphorizing process, adopt oxygen, lime, rhombspar and iron ore as dephosphorizing agent, institute's consumption is by tapping molten steel per ton, and flow of oxygen is 10～35Nm
3, lime consumption is 2～25kg, and the rhombspar consumption is 0～20kg, and the iron ore consumption is 2～25kg, and the fs duration of blast is 260～450 seconds, dephosphorization stage finishing blowing is outwelled 1/4～3/4 the higher dephosphorized slag of phosphorus content; Add lime steel 5～25kg per ton again in the subordinate phase blowing, rhombspar steel 0～20kg per ton, further dephosphorization, the endpoint molten steel phosphorus content that obtains is reduced to below 0.010%.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559985A (en) * | 2012-03-01 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method of smelting low-phosphorus steel through converter |
| CN102559992A (en) * | 2012-03-01 | 2012-07-11 | 首钢总公司 | Vehicle-mounted slag-raking machine for converter, and use method |
| CN102766729A (en) * | 2012-07-30 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Low phosphor control method for high-speed axle steel |
| CN102776314A (en) * | 2012-07-24 | 2012-11-14 | 钢铁研究总院 | Smelting method of ultra-low phosphorus steel |
| CN102965463A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN103014230A (en) * | 2012-06-01 | 2013-04-03 | 新疆八一钢铁股份有限公司 | Method for producing low-phosphorus high-carbon steel by duplex hot-adding slag washing for electric furnace |
| CN103103308A (en) * | 2013-03-06 | 2013-05-15 | 北京科技大学 | Method for controlling phosphorus content of end point molten steel smelted by a top-bottom combined blowing converter to be less than 30 ppm |
| CN103243192A (en) * | 2013-05-14 | 2013-08-14 | 北京科技大学 | Converter smelting method for rapidly and efficiently dephosphorizing low-basicity dephosphorization slag |
| CN103320574A (en) * | 2012-03-23 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Molten iron dephosphorizing method |
| CN104878153A (en) * | 2015-05-22 | 2015-09-02 | 河北钢铁股份有限公司邯郸分公司 | Converter dephosphorization method for high-phosphorus low-silicon molten iron |
| CN105112595A (en) * | 2015-07-24 | 2015-12-02 | 北京科技大学 | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping |
| CN105177217A (en) * | 2015-08-20 | 2015-12-23 | 山东西王特钢有限公司 | Process for reducing steel slag quantity during converter smelting |
| CN105861775A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Smelting process for ultra-low phosphorus steel with high nickel content |
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| CN102212640A (en) * | 2011-06-01 | 2011-10-12 | 首钢总公司 | Convertor steelmaking method capable of reducing slag quantity |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102212640A (en) * | 2011-06-01 | 2011-10-12 | 首钢总公司 | Convertor steelmaking method capable of reducing slag quantity |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559992A (en) * | 2012-03-01 | 2012-07-11 | 首钢总公司 | Vehicle-mounted slag-raking machine for converter, and use method |
| CN102559985B (en) * | 2012-03-01 | 2013-07-31 | 江苏省沙钢钢铁研究院有限公司 | Method of smelting low-phosphorus steel through converter |
| CN102559985A (en) * | 2012-03-01 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method of smelting low-phosphorus steel through converter |
| CN103320574A (en) * | 2012-03-23 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Molten iron dephosphorizing method |
| CN103014230A (en) * | 2012-06-01 | 2013-04-03 | 新疆八一钢铁股份有限公司 | Method for producing low-phosphorus high-carbon steel by duplex hot-adding slag washing for electric furnace |
| CN102776314A (en) * | 2012-07-24 | 2012-11-14 | 钢铁研究总院 | Smelting method of ultra-low phosphorus steel |
| CN102766729B (en) * | 2012-07-30 | 2014-07-16 | 山西太钢不锈钢股份有限公司 | Low phosphor control method for high-speed axle steel |
| CN102766729A (en) * | 2012-07-30 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Low phosphor control method for high-speed axle steel |
| CN102965463A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN102965463B (en) * | 2012-11-21 | 2014-05-28 | 首钢总公司 | Efficient dephosphorization process for converter |
| CN103103308A (en) * | 2013-03-06 | 2013-05-15 | 北京科技大学 | Method for controlling phosphorus content of end point molten steel smelted by a top-bottom combined blowing converter to be less than 30 ppm |
| CN103243192A (en) * | 2013-05-14 | 2013-08-14 | 北京科技大学 | Converter smelting method for rapidly and efficiently dephosphorizing low-basicity dephosphorization slag |
| CN105861775A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Smelting process for ultra-low phosphorus steel with high nickel content |
| CN105861775B (en) * | 2015-01-23 | 2018-04-03 | 鞍钢股份有限公司 | A kind of high nickel content ultra-low phosphoretic steel smelting process method |
| CN104878153A (en) * | 2015-05-22 | 2015-09-02 | 河北钢铁股份有限公司邯郸分公司 | Converter dephosphorization method for high-phosphorus low-silicon molten iron |
| CN105112595A (en) * | 2015-07-24 | 2015-12-02 | 北京科技大学 | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping |
| CN105177217A (en) * | 2015-08-20 | 2015-12-23 | 山东西王特钢有限公司 | Process for reducing steel slag quantity during converter smelting |
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Application publication date: 20120222 |