CN102021273B - Fluidness control method of molten low-silicon aluminized steel of square billet - Google Patents
Fluidness control method of molten low-silicon aluminized steel of square billet Download PDFInfo
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- CN102021273B CN102021273B CN2010106153464A CN201010615346A CN102021273B CN 102021273 B CN102021273 B CN 102021273B CN 2010106153464 A CN2010106153464 A CN 2010106153464A CN 201010615346 A CN201010615346 A CN 201010615346A CN 102021273 B CN102021273 B CN 102021273B
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Abstract
The invention relates to a fluidness control method of molten low-silicon aluminized steel of a square billet molten by a converter (electric furnace) refining furnace. The invention adopts the following process measures: improving the tapping carbon content and the tapping temperature of the converter; carrying out strong deoxidation and great slag operation behind the converter, realizing the deoxidation and slagging forwarding of a refining process, reducing the temperature rise of the refining process, oxidizing, adjusting aluminate and avoiding the floating difficulty of foreign inclusions due to temperature rise, prolonged deoxidation time and great argon amount; and avoiding silicon kickback of the molten steel by suitable wire-feeding amount and slagging amount as well as reasonable dispersion and deoxidation time. The invention realizes the smooth production of the low-silicon aluminized steel under the condition of keeping the original equipment investment, ensures the fluidness of the molten steel, decreases the silicon kickback of the molten steel, solves the problems in the production of the low-silicon aluminized steel, obviously improves the continuous casting sequence in casting, ensures the rhythmed and smooth production, greatly improves the yield of the steel variety and can create considerable economic benefits for production enterprises.
Description
Technical field:
The invention belongs to steelmaking technical field, be specifically related to a kind ofly smelt the low silicon of square billet with converter (electric furnace)-refining furnace and contain aluminum steel fluidity molten steel control method.
Background technology:
Low silicon such as A series cold heading steel, welding rod steel contain the aluminum steel kind, and market demand is very big, and market outlook are good, and added value is high, and converter (electric furnace)-square billet-high line production line is now all in the above-mentioned kind of active development.Low silicon contains that aluminum steel production control requirement is high, and difficult point square billet nozzle clogging is serious in productions, middle Bao Lianla number less, the composition heat that exceeds standard is many.
Also we can say, at present smelt all to have when low silicon such as A series cold heading steel, 10B21, welding rod steel contain aluminum steel and be difficult to the problem that overcomes as follows with changeing () stove:
1, fluidity molten steel is poor, nozzle clogging is serious, and industrial accident is many, and middle Bao Lianla stove number is few.
2, time silicon is many in the smelting process, is prone to exceed standard.
Summary of the invention:
The applicant thinks, improves the molten steel purity, avoids square billet nozzle clogging and the composition most economical effective means that exceeds standard to optimize technological operation exactly, and the present invention has taked following technological measure for this reason: raising converter tapping carbon content and tapping temperature; Strong deoxidation and big quantity of slag operation behind the stove, the deoxidation of realization refining procedure, slag making reach reduce the intensification and the deoxidation of refining process and transfer aluminium, avoid because of heating up and the deaeration time prolongation, and the argon gas amount is excessive, the inclusion floating difficulty; Suitable line feeding amount and slag making amount, rational diffusive deoxidation time avoid molten steel to return silicon.The present invention is under the situation that does not increase any facility investment; Realized that low silicon contains the production direct motion of aluminum steel; Guaranteed molten steel flow property, reduced molten steel and return the silicon amount; Therefore solved an above-mentioned difficult problem, made that Bao Lianla stove number is significantly improved in the continuous casting, can create considerable economic for manufacturing enterprise.
For this reason, the invention provides a kind of low silicon and contain the aluminum steel Comprehensive Control Technology, promptly the low silicon of square billet contains aluminum steel fluidity molten steel control method.The present invention had not only improved molten steel flow property but also had guaranteed the control of low silicon, had realized direct motion, the raising of quality and the reduction of cost of producing, for solid basis has been established in the research and development of square billet variety steel.
The technical scheme that the low silicon of square billet of the present invention contains aluminum steel fluidity molten steel control method is achieved in that
It comprises refining just, ladle refining furnace liquid steel refining, billet continuous casting technology, it is characterized in that it specifically also comprises following technology:
The first step is just refined in converter or electric furnace, and the tapping end point carbon is controlled more than 0.06% (if end point carbon is lower than 0.06%; Oxygen gesture in the slag is high, and molten steel oxidation property is strong, and inclusion is more after the deoxidation; Be difficult for fully come-up), tapping temperature remains on 1640 ℃-1680 ℃ and (is lower than 1640 ℃ like tapping temperature, makes furnaceman LF position molten steel temperature low excessively; LF refining intensification task increases the weight of, and tapping temperature is higher than 1680 ℃, and converter or electric furnace liner corrode serious; Add the easy scaling loss of carbon dust during tapping, cause the yield of carbon to reduce);
Second step; Prepare burden behind the stove: aluminium block 1.4～1.8kg/t, lime 3～4kg/t, fluorite 0.8-1.2kg/t; Ferromanganese adds high-carbon manganese to lower limit according to the smelting steel grade, and tapping joined in the ladle to 1/3 o'clock, deoxidation and big quantity of slag operation behind the reinforcement stove; Reduce the deoxidation of LF stove, desulfurization pressure, prepare for prolonging the white slag hold-time;
In the 3rd step, in ladle refining furnace, carry out liquid steel refining:
A, ladle are opened to the refining position and to be fed aluminum steel 1～2m/t, iron calcium line line feeding totally 5～6m/t at twice, avoid back silicon serious, begin to feed 2.5～3 m/t, make a large amount of Al of production in the ladle
2O
3Sex change come-up, a little less than feed 2～3.5m/t before blowing, send electricity to be heated to be the master with early stage, the later stage heats less or does not heat, make be mingled with fully on
Floating;
B, energising heat up, and begin to add calcium carbide 0.6～1.2kg/t, and the back adds 0.2～0.70 kg/t calcium carbide again according to the slag condition, carries out diffusive deoxidation, produces white slag as early as possible, the stable and prolongation white slag hold-time, reduce refining slag repeatedly.According to the viscosity of bits, short run adds fluorite, and every batch of 0.5～1kg/t, lime add at twice, once add 1～2kg/t, guarantees the flowability of refining slag;
C, refining process mid-early stage ladle bottom blowing argon flow amount are 500-800 l/min, and (argon flow amount is too small, and molten steel temperature and composition and slag-metal reaction are all inhomogeneous; Argon flow amount is excessive, causes slag-metal reaction violent, and molten steel washes away seriously ladle lining; Making oxide compound, sulfide in the slag or in the refractory materials get into molten steel) argon flow amount is 150-300 l/min when blowing a little less than the later stage, only makes inclusion floating, and is (excessive like weak wind drift amount; Cause molten steel to expose again in air; Cause secondary oxidation, pollute molten steel, the inclusion in the slag turns back in the steel again simultaneously.) a little less than the time of blowing be controlled at 8 min above (guaranteeing that steel inclusion has sufficient ascent time and come-up power);
D, refining time are controlled at 40～60min (if refining time is too short less than 40min; Oxide inclusion come-up is insufficient, as greater than 60min, and feeding temperature-raising and Argon repeatedly; Make in the slag or the oxide compound of fire proofed wood, sulfide increase, reduced the flowability of molten steel);
After E, the weak stirring, add carbonization rice husk 0.4～0.5 kg/t (prevent heat loss through radiation, superheating temperature is stablized);
The 4th step, continuous casting:
Whole process protection in A, the casting process is guaranteed long nozzle and submerged nozzle good seal (prevent mouth of a river joint because of air-breathing generation secondary oxidation, stop up the mouth of a river);
B, in wrap the mouth of a river and adopt the aluminium carbon mouth of a river (the special 32mm aluminium carbon mouth of a river); Reduce in the unit surface quantity, reach running balance attached on inclusion on the filling pipe end and the The amount of inclusions of being taken away by molten steel when making molten steel through the mouth of a river attached to inclusion on the filling pipe end;
C, tundish superheating temperature are controlled at 25～45 ℃, and (superheating temperature is too high: steel billet center segregation, shrinkage cavity defect are serious, are prone to bleed-out in the production; Superheating temperature is low excessively, is unfavorable for steel inclusion come-up, is prone to cause that the mouth of a river freezes, and causes cast to interrupt).
In smelting process, can make deoxidation again, slag making reach, promptly refining furnace continues diffusive deoxidation, slag making with an amount of calcium carbide again and further promotes to be mingled with come-up.
The present invention transfers aluminum steel steel-making CONTROL PROCESS to compare with tradition, has the following advantages:
1, through flushing and casting, suitably improve the converter tapping temperature, strengthen the add-on of deoxygenated alloy and slag charge behind the stove; Realize operation deoxidation, slag making reach; Intensification of minimizing refining process and deoxidation accent aluminium amount are avoided because of intensification and deaeration time is long, inclusion floating time weak point, and suitable line feeding amount and slag making amount and rational diffusive deoxidation time have avoided molten steel to return silicon; Fluidity molten steel is improved greatly, reduced because of silicone content exceeds standard and cause changing the original sentence to.
2, molten steel high purity, inclusion content is low.
3, production cost reduces significantly; After fluidity molten steel improved, it was useless because of the cover eye burns large batch of inspection rejects and middle bag that oxygen causes to have stopped square billet, and low silicon contains that the Bao Lianla stove on average increases to 12 stoves by 4.5 stoves in the aluminum steel; Be bundled into this reduction by 63% in the square billet, the silicon height causes steel grade to change the original sentence to rate descending significantly.
4, the technology suitability is strong, and the low silicon that is suitable for high request contains aluminum steel, and the production capacity of converter has obtained release, and order planned more serious contains the aluminum steel kind and lay a good foundation for developing low silicon.
Embodiment:
Below in conjunction with embodiment the present invention is done further detailed description.
Embodiment one:Peace steel 100t converter-100t refining-150 * 150mm
2Square billet uses the inventive method
Smelt SWRCH22A (grade of steel)
1, converter Intake Quantity: 110t, molten iron 90t wherein, steel scrap 20t, the SWRCH22A Composition Control is following:
Carbon: 0.19%～0.23% silicon≤0.1% manganese, 0.69%～0.9% aluminium>=0.015% phosphorus≤0.025% sulphur≤0.01%
2, converter terminal carbon: 0.08%, tapping temperature is 1657 ℃.
3, prepare burden behind the stove:
Aluminium block: 160kg, lime: 352kg, fluorite: 105kg, high carbon ferromanganese: 1010 kg, tapping is to 1/3 adding ladle.
4, refining time 43min, energising heats up, and begins to add calcium carbide 70kg, and the back adds the 51kg calcium carbide again according to the slag condition; According to bits viscosity, short run adds fluorite, and first adds 60kg, and second batch adds 72kg; Lime adds at twice, adds 150kg at every turn.
5, ladle is opened to the refining position and to be fed 120 meters of aluminum steels, feeds 300 meters of iron calcium lines, a little less than feed 230 meters of iron calcium lines again before blowing.
6, refining process mid-early stage argon flow amount 600 l/min, argon flow amount 200 l/min when blowing a little less than the later stage, a little less than blow times 10 min.
7, after the weak stirring, add carbonization rice husk 50kg.
8, whole process protection in the casting process, mouth of a river use argon envelope under the mouth of a river and submerged nozzle and the middle bag under long nozzle and the ladle.
9, wrap the mouth of a river in and adopt the special 32mm aluminium carbon mouth of a river
10, tundish temperature: 1541 ℃ 1548 ℃ 1541 ℃.
11, finished product composition such as following table:
12, cover eye phenomenon do not occur, steel billet composition conformance with standard the silicon phenomenon do not occur back, and no square billet is cut useless.
Embodiment two: peace steel 100t converter-100t refining-150 * 150mm
2Square billet uses the inventive method to smelt 10B21.
1, converter Intake Quantity: 120t, molten iron 95t wherein, steel scrap 25t, the 10B21 Composition Control is following:
Carbon: 0.18%～0.23% silicon≤0.1% manganese, 0.7%～1.0% aluminium>=0.015% phosphorus≤0.025% sulphur≤0.01%
2, converter terminal carbon: 0.094%, tapping temperature is 1643 ℃.
3, prepare burden behind the stove:
Aluminium block: 180kg, lime: 353kg, fluorite: 89kg, high carbon ferromanganese: 963 kg, tapping is to 1/3 adding ladle.
4, refining time 51min, energising heats up, and begins to add calcium carbide 60kg, and the back adds the 65kg calcium carbide again according to the slag condition; Add fluorite according to bits viscosity, short run, first adds 60kg, and second batch adds 72kg; Lime adds at twice, adds 140kg at every turn.
5, ladle is opened to the refining position and to be fed 160 meters of aluminum steels, feeds 350 meters of iron calcium lines, a little less than feed 300 meters of iron calcium lines again before blowing.
6, refining process mid-early stage argon flow amount 700 l/min, argon flow amount 160 l/min when blowing a little less than the later stage, a little less than blow times 12 min.
7, after the weak stirring, add carbonization rice husk 55kg.
8, whole process protection in the casting process, mouth of a river use argon envelope under the mouth of a river, submerged nozzle and the middle bag under long nozzle and the ladle.
9, wrap the mouth of a river in and adopt the special 32mm aluminium carbon mouth of a river
10, tundish temperature: 1549 ℃ 1548 ℃ 1551 ℃.
11, finished product composition such as following table:
12, cover eye phenomenon do not occur, steel billet composition conformance with standard the silicon phenomenon do not occur back, and no square billet is cut useless.
Above instance shows, utilizes the low silicon of square billet of the present invention to contain aluminum steel fluidity molten steel control techniques, can satisfy low silicon fully and contain aluminum steel production needs.The present invention need not purchase or transform any equipment; Only just can improve fluidity molten steel, reduce square billet and cut useless and middle bag and water surplusly, improve middle continuous cast crystallizer number and steel quality through process optimization; Reduced the rate of changing the original sentence to; This working method is simple, is particularly useful for the production that the low silicon of square billet contains aluminum steel, has good application prospects.
Claims (3)
1. the low silicon of square billet contains aluminum steel fluidity molten steel control method, comprises refining just, ladle refining furnace refining, billet continuous casting technology, it is characterized in that it specifically also comprises following technology:
The first step is just refined in converter or electric furnace, joins end point carbon control behind the stove more than 0.06%, and tapping temperature remains on 1640 ℃-1680 ℃;
Second step; Prepare burden behind the stove: aluminium block 1.4～1.8kg/t, lime 3～4kg/t, fluorite 0.8-1.2kg/t; Ferromanganese adds high carbon ferromanganese to lower limit according to the smelting steel grade, and tapping joined in the ladle to 1/3 o'clock, deoxidation and big quantity of slag operation behind the reinforcement stove; Reduce the deoxidation of LF stove, desulfurization pressure, prepare for prolonging the white slag hold-time;
In the 3rd step, in ladle refining furnace, carry out liquid steel refining:
A, ladle are opened to the refining position and to be fed aluminum steel 1～2m/t, iron calcium line line feeding totally 5～6m/t at twice, avoid back silicon serious, begin to feed 2.5～3 m/t, make a large amount of Al of production in the ladle
2O
3Sex change come-up, a little less than feed 2～3.5m/t before blowing, send electricity to be heated to be the master with early stage, the later stage heats less or does not heat, and makes to be mingled with abundant come-up;
B, energising heat up, and begin to add calcium carbide 0.6～1.2kg/t, and the back adds calcium carbide 0.2～0.70 kg/t again according to the slag condition; Carry out diffusive deoxidation, produce white slag as early as possible, the stable and prolongation white slag hold-time; Reduce refining slag repeatedly, according to the viscosity of bits, short run adds fluorite; Every batch of 0.5～1kg/t, lime add at twice, once add 1～2kg/t, guarantee the flowability of refining slag;
C, refining process mid-early stage ladle bottom blowing argon flow amount are 500-800 L/min, and argon flow amount is 150-300 L/min when blowing a little less than the later stage, a little less than the time of blowing be controlled at more than 8 min;
D, refining time are controlled at 40～60min;
After E, the weak stirring, add carbonization rice husk 0.4～0.5 kg/t;
The 4th step, continuous casting:
Whole process protection in A, the casting process is guaranteed long nozzle and submerged nozzle good seal;
B, in wrap the mouth of a river and adopt the big mouth of a river of aluminium carbon, reduce in the unit surface quantity attached to inclusion on the filling pipe end, reach running balance attached on inclusion on the filling pipe end and the The amount of inclusions of being taken away by molten steel when making molten steel through the mouth of a river;
C, middle bag superheating temperature are controlled at 25～45 ℃.
2. the low silicon of a kind of square billet according to claim 1 contains aluminum steel fluidity molten steel control method, it is characterized in that, and deoxidation, slag making reach, refining furnace continues diffusive deoxidation, slag making with an amount of calcium carbide and further promotes to be mingled with come-up.
3. the low silicon of a kind of square billet according to claim 1 contains aluminum steel fluidity molten steel control method, it is characterized in that, in wrap the mouth of a river and adopt the 32mm aluminium carbon mouth of a river.
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| CN102268513B (en) * | 2011-06-30 | 2012-12-12 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN102747269A (en) * | 2012-05-22 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Low-silicon aluminum-containing steel and production method thereof |
| CN103741023B (en) * | 2014-01-02 | 2015-09-23 | 山西太钢不锈钢股份有限公司 | A kind of smelting process of nonmagnetic steel |
| TWI560276B (en) * | 2014-06-04 | 2016-12-01 | China Steel Corp | Steel making method |
| CN105855494B (en) * | 2015-01-23 | 2019-02-26 | 鞍钢股份有限公司 | The processing method of small billet casting machine on a kind of low-carbon aluminum steel molten steel |
| CN106011379B (en) * | 2016-08-02 | 2019-02-12 | 芜湖新兴铸管有限责任公司 | The method of deoxidation of cold-forging steel |
| CN107447157B (en) * | 2017-08-02 | 2020-01-14 | 首钢水城钢铁（集团）有限责任公司 | Cold heading steel and manufacturing process thereof |
| CN110468324A (en) * | 2019-08-05 | 2019-11-19 | 邯郸钢铁集团有限责任公司 | A kind of cold-heading pours continuous casting producing method with the company of low silicon Aluminum steel |
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| CN1219099C (en) * | 2003-04-25 | 2005-09-14 | 南京钢铁联合有限公司 | Production process of aluminium-containing steel |
| CN100343397C (en) * | 2003-09-17 | 2007-10-17 | 首钢总公司 | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster |
| CN101597666A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of method that is used to improve plate of moderate thickness carbon aluminium-killed steel molten steel cleanness |
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