CN101423879A - Smelting method of low-phosphorus steel - Google Patents
Smelting method of low-phosphorus steel Download PDFInfo
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- CN101423879A CN101423879A CNA2007101579223A CN200710157922A CN101423879A CN 101423879 A CN101423879 A CN 101423879A CN A2007101579223 A CNA2007101579223 A CN A2007101579223A CN 200710157922 A CN200710157922 A CN 200710157922A CN 101423879 A CN101423879 A CN 101423879A
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Abstract
The invention provides a smelting method for efficiently producing low-phosphorous liquid steel through one-time slagging in a converter. The method comprises converter smelting and ladle refining. The method is characterized in that the temperature of converter smelting liquid steel is higher than or equal to 1,680 DEG C; the phosphorous content of the liquid steel is less than 0.012 percent; activity oxygen in the liquid steel is controlled to account for 0.1 to 0.13 percent; before converter tapping, deep dephosphorization agents are put into a ladle; in a converter tapping process, slag stopping control is performed so as to ensure that the amount of outflow slag is less than or equal to 3 kilograms per ton of steel, and the liquid steel in the ladle is subjected to weak deoxidation treatment; after the tapping is over, the deep dephosphorization agents are put into the ladle again; then ladle bottom blowing and argon stirring are carried out; and finally, steel slag in the ladle is eliminated by use of a ladle slagging-off device. Compared with other methods, the low-phosphorous liquid steel smelting method reduces slag amount by more than 20 percent and shortens converter smelting period by more than 5 percent. As slagging is carried out only once in a converter, the method is little in the erosion of a converter lining, and rephosphorization phenomena can not occur in a secondary refining process of the liquid steel.
Description
Technical field
The invention belongs to the smelting iron and steel technical field, relate in particular to a kind of production method of low phosphoretic steel.
Background technology
Phosphorus is harmful element common in the steel, easily at grain boundary segregation, causes the low temperature brittleness and the temper brittleness of steel.More and more strictness of the requirement of phosphorus content in the senior high-quality steel to steel, particularly for Cryogenic Steel, marine steel, anti-hydrogen induced cracking steel etc., so the problem of dephosphorization is subjected to showing great attention to of metallurgical boundary always in the STEELMAKING PRODUCTION.In recent years, the smelting of Clean Steel is subjected to the great attention of countries in the world, and as the integral part that Clean Steel is smelted, the production of low phosphoretic steel (ω [P]＜0.01%) and ultra-low phosphoretic steel (ω [P]＜0.003%) is a very important content.
Phosphorus can complete miscibility in molten steel, and its oxide compound P
2O
5Solubleness in steel is very little, therefore will remove the phosphorus in the steel, at first must make phosphorus oxidation, and make its oxidation products can enter slag, also will be fixed on the oxide compound of phosphorus in the slag in addition, does not allow it decompose again and turns back in the molten steel.
The vacuum processing method of existing liquid steel dephosphorization is to add dephosphorizing agent to remove phosphorus in the molten steel under vacuum decompression degassing condition.Chinese patent " converter oxygen nitrogen top blast dephosphorizing method " is a kind of converter oxygen nitrogen top blast dephosphorizing method (CN03128987.8), utilizes converter top rifle to have two kinds of source of the gas master modes, and the controlization slag prevents splash, improves the stability and the security of dephosphorization.The extensive two kinds of steel-making dephosphorization technologies that adopt of steelworks are produced low-phosphorous and extremely low-phosphorous steel grade both at home and abroad at present: the one, and single stove double slag process (abbreviation double slag process), be in the secondary slag making in the cycle of a converter smelting, wherein dephosphorization treatment is carried out in a slag making, primary slag claws from converter after finishing dephosphorization treatment, carbonization treatment is mainly carried out in the secondary slag making, and this method can be produced low phosphoretic steel; The 2nd, twin furnace double slag process (abbreviation duplex practice), promptly after a converter is made primary slag and carried out dephosphorization of molten iron, " half steel " tapping in the stove is poured another converter into and is carried out the secondary slag making and carry out carbonization treatment, and this technology can be produced low phosphoretic steel and ultra-low phosphoretic steel.SUMITOMO CHEMICAL metal Wakayama factory, the chamber Lan Chang of Japanese Nippon Steel, Korea S Pu Xiang Guangyang factory etc. all adopt this method (also claiming SRP), Baosteel and Anshan iron and steel plant also all to adopt the converter duplex method to produce low-phosphorous and extremely low-phosphorous steel grade now.These two kinds of methods all are in the slag making of converter secondary, wherein carry out the low temperature dephosphorization after the slag making for the first time, and general dephosphorization temperature is controlled at 1350 ℃～1450 ℃, and slag making is for the second time carried out decarburization in same converter or second converter.These two kinds of methods are all utilized thermodynamic principles, and temperature is low to be helped molten steel phosphorus and shift in slag.
Single stove double slag process and duplex practice are all finished dephosphorization treatment in converter, need twice a large amount of slag making in converter, and all need quick slagging in converter, therefore, the normal low melting point of introducing causes converter lining is damaged, and reduces converter lining life as quick dissolving agent.In addition, all twice slag making in converter of single stove double slag process and duplex practice, it is long to take the converter time in causing producing, and influences converter productivity.
Summary of the invention
The objective of the invention is to overcome the defective that prior art exists, a kind of smelting process of the low phosphoretic steel of High-efficient Production of a slag making in converter is provided.
The smelting process of low-phosphorus molten steel of the present invention is achieved in that this method comprises converter smelting and ladle refining, is characterized in liquid steel temperature 〉=1680 ℃ of converter smelting, and phosphorus content is less than 0.012% in the molten steel, and activity oxygen is controlled at 0.1%～0.13% in the molten steel; Before the converter tapping, the deep dephosphorization agent of in ladle, packing into earlier; Carry out pushing off the slag control in the converter tapping process, the following quantity of slag≤3kg/ ton steel, and the molten steel in the ladle carried out weak deoxidation treatment; After tapping finishes, in ladle, drop into the deep dephosphorization agent again; Then, carrying out the steel ladle bottom argon blowing gas mixing mixes; At last, remove slag in the ladle with the ladle device of skimming.
The deep dephosphorization agent quantity that smelting method of low-phosphorus steel of the present invention is packed in ladle earlier is 3～4kg/ ton molten steel, and after tapping finished, the deep dephosphorization agent quantity that drops in the ladle was 6～7kg/ ton steel again; Also drop into the metal aluminum shot to ladle in the converter tapping process, input amount is a 0.5kg/ ton steel, and molten steel is carried out weak deoxidation treatment; The argon bottom-blowing that steel ladle bottom argon blowing gas mixing of the present invention is mixed should be controlled at 20～25Nm
3/ min, the bottom blowing time is 4～6min; Of the present invention is more than 95% with the ladle slag that device removes in the ladle of skimming, and adds slag making materials and be covered in molten steel surface; The present invention goes into molten iron phosphorus content＜0.07% of converter, phosphorus content in the converter tapping water＜0.012%, the final back ω [P]＜0.005% that handles.
Deep dephosphorization agent of the present invention can be a powder mixture, also can be to melt composition granule in advance the consisting of of this deep dephosphorization agent (weight percent): 20%～40% CaO, 20%～35% FeO, 10%～15% Fe
2O
3, 10%～20 Al
2O
3, 3%～5% SiO2,2%～3% MnO, 2%～3% MgO.
The method that the present invention proposes is mainly considered from the kinetics angle, behind converter smelting, utilize good dynamic conditions to be under the low-level condition under the hot conditions at total system phosphorus, by in ladle, making high basicity, high-temperature, low viscosity, high reactivity slag, and apply with high-power stirring, improve slag-steel speed of response, make that phosphorus shifts in the molten steel in slag, and after reaction is becoming tight balance, the utilization equipment of skimming is removed slag in the ladle from ladle, realize the molten steel deep dephosphorization, produce low phosphoretic steel or ultra-low phosphoretic steel.
Although the method that the present invention proposes considers that low temperature helps improving phosphorus in slag and iron (steel) partition ratio, generally all specifying the suitable dephosphorization temperature of molten iron is about 1350 ℃, but detrimentally affects such as under low-temperature condition, speed of response is slow, slag weak effect, slag fluidity is bad, slag basicity is low.
Smelting method of low-phosphorus steel of the present invention mainly comprises:
1) in a converter, molten iron is carried out dephosphorization, carbonization treatment by present conventional treatment process, go into the stove molten iron temperature and be controlled at 1200 ℃～1380 ℃, its molten iron phosphorus content is below 0.07%, with metallurgical lime is main slag making, and the slag making amount is 40～50kg/ ton steel, carries out oxygen top blown and smelts, be 20～35min tap to tap time, control is smelted the emphasis liquid steel temperature and is surpassed 1680 ℃, and phosphorus content is less than 0.012% in the molten steel, and activity oxygen is controlled at 0.1%～0.13% in the molten steel;
2) after converter smelting finishes, in tapping process, carry out pushing off the slag control, prevent that converter slag from entering ladle with molten steel, the quantity of slag is less than 3kg/ ton steel under the control, before the tapping, the deep dephosphorization agent of in ladle, packing into, Intake Quantity is 3～4kg/ ton molten steel, drops into the metal aluminum shot to ladle in the converter tapping process, input amount is a 0.5kg/ ton steel, and molten steel is carried out weak deoxidation treatment;
3) after tapping finishes, continue to drop into the deep dephosphorization agent in ladle, input amount is 6～7kg/ ton steel, carries out the steel ladle bottom argon blowing gas mixing immediately and mixes, and argon bottom-blowing is controlled at 20～25Nm
3/ min, the bottom blowing time is 4～6min;
4) after argon bottom-blowing finishes, utilize the ladle device of skimming that slag in the ladle is clawed, need slag in the ladle is removed more than 95%, add slag making materials afterwards and be covered in molten steel surface, handle back molten steel ω [P]＜0.005%.
Smelting method of low-phosphorus steel of the present invention is compared the quantity of slag and is reduced more than 20% with other method, the converter smelting cycle shortens more than 5%, and is also little to the erosion of converter lining because of only carry out a slag making in converter, and do not produce the rephosphorization phenomenon in steel secondary refining.
Embodiment
Embodiment 1:
With 500kg induction furnace deep dephosphorization is example.
With medium-frequency induction furnace fusing molten steel 500kg, ω [P]=0.0070%, 1678 ℃ of liquid steel temperatures, with metallurgical lime, red iron oxide, aluminium vanadine is slag former, and simultaneously as the deep dephosphorization agent, adding the slag total amount is 2.5kg, its composition is 35%CaO, 30%FeO, 13%Fe
2O
3, 18%Al
2O
3, 2%SiO2,1%MnO, 1%MgO.Utilize induced current to stir, handle 5min after, crucible is tilted, slag is clawed from crucible, claw surpass 95% after, add metallurgical lime 1kg and make new slag, cover molten steel, molten steel ω [P] reduces to 0.0015% from 0.0070%.
Embodiment 2:
Be applied as example with 180 tons of converters.
Advance converter molten iron ω [P]=0.04%, in converter smelting, be slag former with metallurgical lime, iron sheet ball, light dolomite, the slag making amount is 8.9 tons, 30 minutes tap to tap time, 190 tons of taps, converter tapping water ω [P]=0.008% adds 0.8 ton of deep dephosphorization agent in ladle, tapping adds 1.6 tons of deep dephosphorization agent after finishing again, the dephosphorizing agent composition is: 33%CaO, 29%FeO, 13%Fe
2O
3, 18%Al
2O
3, 3%SiO2,2%MnO, 2%MgO.1675 ℃ of liquid steel temperatures carry out the argon gas bottom blowing and stir, and air supply intensity is 20Nm
3/ min, churning time 5min.The processing of skimming is then removed slag in the ladle more than 95%, and slag making again, promptly finishes whole dephosphorization treatment, molten steel ω [P]=0.004%.Compare the minimizing quantity of slag with dephosphorization technologies such as " two slag " method, " duplex " methods and consume 6～7 tons, minimizing 3～5min consuming time.
Claims (7)
1. a smelting method of low-phosphorus steel comprises converter smelting and ladle refining, it is characterized in that liquid steel temperature 〉=1680 ℃ of converter smelting, and phosphorus content is less than 0.012% in the molten steel, and activity oxygen is controlled at 0.1%～0.13% in the molten steel; Before the converter tapping, the deep dephosphorization agent of in ladle, packing into earlier; Carry out pushing off the slag control in the converter tapping process, the following quantity of slag≤3kg/ ton steel, and the molten steel in the ladle carried out weak deoxidation treatment; After tapping finishes, in ladle, drop into the deep dephosphorization agent again; Then, carrying out the steel ladle bottom argon blowing gas mixing mixes; At last, remove slag in the ladle with the ladle device of skimming.
2. smelting method of low-phosphorus steel according to claim 1 is characterized in that the deep dephosphorization agent quantity of packing into earlier is 3～4kg/ ton molten steel in ladle, after tapping finished, the deep dephosphorization agent quantity that drops in the ladle was 6～7kg/ ton steel again.
3. smelting method of low-phosphorus steel according to claim 1 and 2 is characterized in that dropping into the metal aluminum shot to ladle in the converter tapping process, and input amount is a 0.5kg/ ton steel, and molten steel is carried out weak deoxidation treatment.
4. smelting method of low-phosphorus steel according to claim 1 and 2 is characterized in that the argon bottom-blowing that the steel ladle bottom argon blowing gas mixing is mixed is controlled at 20～25Nm
3/ min, the bottom blowing time is 4～6min.
5. smelting method of low-phosphorus steel according to claim 1 and 2 it is characterized in that removing the slag 95% or more in the ladle with the ladle device of skimming, and the adding slag making materials is covered in molten steel surface.
6. smelting method of low-phosphorus steel according to claim 1 and 2 is characterized in that molten iron phosphorus content＜0.07% into converter, phosphorus content in the converter tapping water＜0.012%, the final back ω [P]＜0.005% that handles.
7. smelting method of low-phosphorus steel according to claim 1 and 2, it is characterized in that described deep dephosphorization agent can be powder mixture or melt composition granule in advance, its composition (weight percent): 20%～40% CaO, 20%～35% FeO, 10%～15% Fe
2O
3, 10%～20% Al
2O
3, 3%～5% SiO2,2%～3% MnO, 2%～3% MgO.
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|---|---|---|---|
| CNA2007101579223A CN101423879A (en) | 2007-10-31 | 2007-10-31 | Smelting method of low-phosphorus steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101579223A CN101423879A (en) | 2007-10-31 | 2007-10-31 | Smelting method of low-phosphorus steel |
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| CN101423879A true CN101423879A (en) | 2009-05-06 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296148A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Dephosphorization method in IF (Interstitial-Free) ladle |
| CN102796948A (en) * | 2011-05-27 | 2012-11-28 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with extremely low content of Ti and smelting method for non-oriented electrical steel plate |
| CN102839251A (en) * | 2012-09-13 | 2012-12-26 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN102847903A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for manufacturing low-total-oxygen steel |
| KR20150018878A (en) * | 2012-06-18 | 2015-02-24 | 제이에프이 스틸 가부시키가이샤 | Refining method and molten steel production method |
| CN104561434A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low-phosphorus steel smelting process |
| CN106811569A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of method of producing ultra-low phosphorous steel by converter |
| CN107557534A (en) * | 2017-10-31 | 2018-01-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of extremely low phosphoretic steel |
| CN107723415A (en) * | 2017-10-31 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur |
| CN109207672A (en) * | 2018-12-03 | 2019-01-15 | 南阳汉冶特钢有限公司 | A kind of production method of Slagoff method and ultra-low phosphoretic steel in ultra-low phosphoretic steel production process |
| CN113215345A (en) * | 2021-04-09 | 2021-08-06 | 阳春新钢铁有限责任公司 | Method for controlling slag discharge and rephosphorization in converter tapping process |
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2007
- 2007-10-31 CN CNA2007101579223A patent/CN101423879A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296148A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Dephosphorization method in IF (Interstitial-Free) ladle |
| CN102796948A (en) * | 2011-05-27 | 2012-11-28 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with extremely low content of Ti and smelting method for non-oriented electrical steel plate |
| CN102796948B (en) * | 2011-05-27 | 2014-03-19 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with extremely low content of Ti and smelting method for non-oriented electrical steel plate |
| CN102847903B (en) * | 2011-06-29 | 2014-05-07 | 鞍钢股份有限公司 | Method for manufacturing low-total-oxygen steel |
| CN102847903A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for manufacturing low-total-oxygen steel |
| CN104379772A (en) * | 2012-06-18 | 2015-02-25 | 杰富意钢铁株式会社 | Refining method and molten steel production method |
| KR20150018878A (en) * | 2012-06-18 | 2015-02-24 | 제이에프이 스틸 가부시키가이샤 | Refining method and molten steel production method |
| KR101702247B1 (en) * | 2012-06-18 | 2017-02-03 | 제이에프이 스틸 가부시키가이샤 | Refining method and molten steel production method |
| CN104379772B (en) * | 2012-06-18 | 2017-10-10 | 杰富意钢铁株式会社 | Method of refining and molten steel manufacture method |
| CN102839251B (en) * | 2012-09-13 | 2015-01-21 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN102839251A (en) * | 2012-09-13 | 2012-12-26 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN104561434A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low-phosphorus steel smelting process |
| CN106811569A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of method of producing ultra-low phosphorous steel by converter |
| CN107557534A (en) * | 2017-10-31 | 2018-01-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of extremely low phosphoretic steel |
| CN107723415A (en) * | 2017-10-31 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur |
| CN109207672A (en) * | 2018-12-03 | 2019-01-15 | 南阳汉冶特钢有限公司 | A kind of production method of Slagoff method and ultra-low phosphoretic steel in ultra-low phosphoretic steel production process |
| US11718885B2 (en) | 2018-12-03 | 2023-08-08 | Nanyang Hanye Special Steel Co., Ltd | Slag discharging method in process of producing ultra-low phosphorus steel and method for producing ultra-low phosphorus steel |
| CN113215345A (en) * | 2021-04-09 | 2021-08-06 | 阳春新钢铁有限责任公司 | Method for controlling slag discharge and rephosphorization in converter tapping process |
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