CN102816894A - Control method for enhancing RH vacuum circulation decarburization rate - Google Patents
Control method for enhancing RH vacuum circulation decarburization rate Download PDFInfo
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- CN102816894A CN102816894A CN2012103002090A CN201210300209A CN102816894A CN 102816894 A CN102816894 A CN 102816894A CN 2012103002090 A CN2012103002090 A CN 2012103002090A CN 201210300209 A CN201210300209 A CN 201210300209A CN 102816894 A CN102816894 A CN 102816894A
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Abstract
The invention relates to a control method for enhancing an RH vacuum circulation decarburization rate, and relates to the technical field of an automotive steel smelting process. The technical scheme is as follows: argon blowing pipes are uniformly arranged in a riser of an RH vacuum refining furnace and are communicated with argon and drive the argon; breathable bricks are arranged at the bottom of a steel ladle and are connected with an argon blowing station to ensure that after an immersion pipe is inserted into molten steel, the breathable bricks are rightly opposite to the projection center of the RH riser at the bottom of the steel ladle, and the breathable state of the breathable bricks is good; a safety depth is reserved between the lower port of the immersion pipe inserted into the molten steel and the liquid surface of steel ladle slag; and vacuum decarburization treatment is carried out, after the molten steel is subjected to vacuum treatment, all vacuum pumps are put into use, and the argon flow amount is adjusted and driven, so that the molten steel starts to be decarburized in a vacuum circulation state. According to the control method, the amount of argon blown at the bottom of the steel ladle at the center of the riser is increased, the dead angle of a molten steel flow field in the steel ladle is reduced, the power of molten steel circulation is effectively compensated, and the stirring speed of molten steel between the lower port of the immersion pipe inserted into the molten steel and the liquid surface of the steel ladle slag is increased, and thus the decarburization efficiency of molten steel is improved.
Description
Technical field
The present invention relates to a kind of control method of the RH of lifting vacuum cycle decarbonization rate, belong to automobile steel smelting technology technical field.
Background technology
Quickening along with China's process of industrialization; Automobile consumption market enlarges year by year; On the market requirement as the ultra low-carbon steel of body of a motor car stamping parts is increased,, utilize the decarburization of RH vacuum cycle to become the important method of producing ultra low-carbon steel along with the popularization of vacuum decarburization technology.Traditional RH vacuum cycle decarburization ultimate principle is: utilize the soaking tub (comprising a upcast and a downtake) of RH vacuum refining furnace to insert the following certain depth of liquid steel level simultaneously; Feed argon gas as driving gas through the ar gas passage that is installed in upcast; And vacuumize under the effect that causes the Vakuumkammer inside and outside differential pressure at vacuum pump; The molten steel that drives in the ladle gets into upcast; Flow through behind the Vakuumkammer, be back to by downtake again and accomplish once circulation in the ladle, simultaneously under vacuum action; [C] in the molten steel taken away discharge with hydrocarbon and the interior flue gas of Vakuumkammer that [O] reaction generates, thereby the realization molten steel is accomplished decarburizating in successive vacuum cycle treating processes.In above-mentioned carbon rejection process; Decarbonization rate mainly is activated the influence of gas flow and vacuum tightness; Have following shortcoming: 1. the driving gas flow reaches peak, and when reaching capacity vacuum tightness, also there is the dead angle, flow field at the bag end in molten steel with bag wall intersection in the ladle; Suppress MOLTEN STEEL FLOW, influence the molten steel decarbonization rate; 2. soaking tub lower port and the part MOLTEN STEEL FLOW between the ladle slag liquid level of inserting molten steel are slow; Limited the even time of this part molten steel and whole Baogang water; Influence the decarburization time of molten steel; Especially for smelting the ultra low-carbon steel of carbon content less than 20ppm, its effect that influences the molten steel decarbonization rate is more obvious.
Summary of the invention
The object of the invention provides a kind of control method of the RH of lifting vacuum cycle decarbonization rate; Through control ladle argon-blown airshed, coordinate mutually with vacuum tightness and lift gas flow control, improve the stirring of molten steel in RH vacuum cycle flow and the RH vacuum cycle carbon rejection process ladle; Reduce the dead angle, circulation flow field of molten steel in the ladle; Shorten the molten steel mixing time, realize the decarburization rapidly and efficiently of molten steel, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of control method that promotes RH vacuum cycle decarbonization rate comprises following technological process: 1. in RH vacuum refining furnace upcast inboard apart from 1/3 place, upcast lower end, evenly arrange the Argon pipe, the Argon pipe be communicated with to drive argon gas; 2. ladle bottom is provided with gas permeable brick, and this gas permeable brick connects the Argon station, guarantees that soaking tub inserts after the molten steel, and in the ladle bottom projection centre, gas permeable brick is ventilative in good condition over against the RH upcast in the position of gas permeable brick; 3. the soaking tub of RH vacuum refining furnace comprises a upcast and a downtake, inserts molten steel simultaneously; The soaking tub lower port of inserting molten steel leaves safety depth apart from the ladle slag liquid level; 4. vacuum decarburization is handled, and after molten steel began vacuum-treat, vacuum pump all came into operation, and adjusting driving argon flow amount makes molten steel under the vacuum cycle state, begin decarburization; 5. open the ladle bottom blowing argon gas,, open and aim at the gas permeable brick argon bottom-blowing trip switch of upcast in the ladle bottom projection centre when every grade of vacuum pump all drops into when vacuumizing operation; 6. close the ladle bottom blowing argon gas, before the aluminum deoxidation operation, close the steel ladle bottom argon blowing air cock, finish up to the vacuum cycle processing.
Described RH vacuum refining furnace drives the argon flow amount scope at 1400-3400Nl/min.
The safety depth that described soaking tub inserts molten steel is 450mm-700mm.
Described vacuum decarburization is handled, with vacuum cycle zero hour to every grade of vacuum pump all drop into vacuumize constantly in, upcast drives argon flow amount and is controlled at 1400-2500 Nl/min; From every grade of vacuum pump all drop into vacuumize constantly to decarburization be the finish time aluminum deoxidation constantly, upcast driving gas flow is controlled at 2500-3400 Nl/min.
The described ladle bottom blowing argon gas of opening is controlled at 0.1-0.8Nl/ (min t steel) with the ratio of ladle bottom blowing argon flow amount and molten steel weight, keeps the fine motion of ladle slag liquid level to be as the criterion.
The purity of said ladle bottom blowing argon gas and driving argon gas is 99.99%.
The invention has the beneficial effects as follows: (1) has increased the ladle bottom blowing argon gas over against the upcast center; Reduce the dead angle of molten steel flow field in the ladle; Effectively compensate molten steel round-robin power; Improve the agitation speed of the molten steel between soaking tub lower port to the ladle slag liquid level that inserts molten steel, thereby improve molten steel decarburization efficient; (2) for smelting the ultra low-carbon steel of carbon content less than 20ppm; The RH vacuum decarburization later stage is reduced the restricted link that the rate of mass transfer that causes carbon becomes decarburization because of carbon content; Utilize this inventive method can improve the whole mixing effect of molten steel, help addressing this problem; (3) ratio of ladle bottom blowing argon flow amount and molten steel amount is controlled at the scope of 0.1-0.8Nl/ (min t), prevents to cause the big ups and downs of slag liquid level in the ladle and rolls up slag; (4) smelting extremely low steel can realize that the carbon content in the RH vacuum decarburization endpoint molten steel is more even; (5) require soaking tub to be inserted with a safety depth, can prevent, can reduce also that to insert molten steel dark excessively because of soaking tub, cause slag not have soaking tub, scaling loss equipment because of soaking tub inserts the shallow excessively slag absorbing accident that causes the vacuum-treat process of molten steel; (6) require the purity of argon bottom-blowing or driving argon gas to reach 99.99%, the argon gas that prevents to be blown in the molten steel is brought other impurity into, influences steel quality.
Embodiment
The practical implementation effect is seen attached list.Below through embodiment the present invention is described further.
Embodiment one:
1, RH vacuum refining furnace upcast inboard far from the lower end 1/3 place, divide 16 of two-layer average layout Argon pipes, the Argon pipe be communicated with to drive argon gas; Ladle bottom is provided with two gas permeable bricks, and gas permeable brick connects the Argon station, and in the ladle bottom projection centre, gas permeable brick is ventilative in good condition over against the RH upcast in the position that a gas permeable brick wherein arranged; Purity of argon is 99.99%.
2, insert the safety depth of the soaking tub lower port of molten steel apart from ladle slag liquid level maintenance 450mm.
3, the RH vacuum decarburization is handled: begin vacuum cycle zero hour from molten steel, all come into operation to the level Four vacuum pump and end constantly, upcast drives argon flow amount and remains on 2500 Nl/min.The level Four vacuum pump all comes into operation constantly; Upcast is driven argon flow amount be adjusted into 3400 Nl/min; Open steel ladle bottom argon blowing gas control system switch simultaneously; The ratio of ladle bottom blowing argon flow amount and molten steel weight is 0.1Nl/ (min t), closes steel ladle bottom argon blowing gas control system switch the finish time up to vacuum decarburization.
Embodiment two:
1, RH vacuum refining furnace upcast inboard far from the lower end 1/3 place, divide 16 of two-layer average layout Argon pipes, the Argon pipe be communicated with to drive argon gas; Ladle bottom is provided with two gas permeable bricks, and gas permeable brick connects the Argon station, and in the ladle bottom projection centre, gas permeable brick is ventilative in good condition over against the RH upcast in the position that a gas permeable brick wherein arranged; Purity of argon is 99.99%.
2, insert the safety depth of the soaking tub lower port of molten steel apart from ladle slag liquid level maintenance 560mm.
3, the RH vacuum decarburization is handled: begin vacuum cycle zero hour from molten steel, all come into operation to the level Four vacuum pump and end constantly, upcast drives argon flow amount and remains on 2000 Nl/min.The level Four vacuum pump all comes into operation constantly; Upcast is driven argon flow amount be adjusted into 2500 Nl/min; Open simultaneously over against the argon bottom-blowing trip switch of upcast at the air brick of steel ladle of ladle bottom projection centre; The ratio of ladle bottom blowing argon flow amount and molten steel weight is 0.8Nl/ (min t), closes steel ladle bottom argon blowing gas control system switch the finish time up to vacuum decarburization.
Embodiment three:
1, RH vacuum refining furnace upcast inboard far from the lower end 1/3 place, divide 16 of two-layer average layout Argon pipes, the Argon pipe be communicated with to drive argon gas; Ladle bottom is provided with two gas permeable bricks, and gas permeable brick connects the Argon station, and in the ladle bottom projection centre, gas permeable brick is ventilative in good condition over against the RH upcast in the position that a gas permeable brick wherein arranged; Purity of argon is 99.99%.
2, insert the safety depth of the soaking tub lower port of molten steel apart from ladle slag liquid level maintenance 700mm.
3, the RH vacuum decarburization is handled: begin vacuum cycle zero hour from molten steel, all come into operation to the level Four vacuum pump and end constantly, upcast drives argon flow amount and remains on 1400 Nl/min.The level Four vacuum pump all comes into operation constantly; Upcast is driven argon flow amount be adjusted into 2800 Nl/min; Open steel ladle bottom argon blowing gas control system switch simultaneously; The ratio of ladle bottom blowing argon flow amount and molten steel weight is 0.6Nl/ (min t), closes steel ladle bottom argon blowing gas control system switch the finish time up to vacuum decarburization.
Subordinate list:
Through the 8 stove IF steel decarburization testing datas of contrast in the subordinate list, show the technological operation of adopting this patent requirement after, the carbon content when the RH decarburization finishes in the molten steel reduces; Decarburization time shortens; Therefore implementation result of the present invention is obvious, and decarburization efficient improves, and has the advantage that is better than routine operation.
Claims (6)
1. control method that promotes RH vacuum cycle decarbonization rate is characterized in that comprising following technological process: 1. in RH vacuum refining furnace upcast inboard apart from 1/3 place, upcast lower end, evenly arrange the Argon pipe, the Argon pipe is communicated with and drives argon gas; 2. ladle bottom is provided with gas permeable brick, and this gas permeable brick connects the Argon station, guarantees that soaking tub inserts after the molten steel, and in the ladle bottom projection centre, gas permeable brick is ventilative in good condition over against the RH upcast in the position of gas permeable brick; 3. the soaking tub of RH vacuum refining furnace comprises a upcast and a downtake, inserts molten steel simultaneously; The soaking tub lower port of inserting molten steel leaves safety depth apart from the ladle slag liquid level; 4. vacuum decarburization is handled, and after molten steel began vacuum-treat, vacuum pump all came into operation, and adjusting driving argon flow amount makes molten steel under the vacuum cycle state, begin decarburization; 5. open the ladle bottom blowing argon gas,, open and aim at the gas permeable brick argon bottom-blowing trip switch of upcast in the ladle bottom projection centre when every grade of vacuum pump all drops into when vacuumizing operation; 6. close the ladle bottom blowing argon gas, before the aluminum deoxidation operation, close the steel ladle bottom argon blowing air cock, finish up to the vacuum cycle processing.
2. according to the said a kind of control method that promotes RH vacuum cycle decarbonization rate of claim 1, it is characterized in that described RH vacuum refining furnace drives the argon flow amount scope at 1400-3400Nl/min.
3. according to claim 1 or 2 said a kind of control methods that promote RH vacuum cycle decarbonization rate, it is characterized in that the safety depth of described soaking tub insertion molten steel is 450mm-700mm.
4. according to the said a kind of control method that promotes RH vacuum cycle decarbonization rate of claim 2; It is characterized in that described vacuum decarburization processing; With vacuum cycle zero hour to every grade of vacuum pump all drop into vacuumize constantly in, upcast drives argon flow amount and is controlled at 1400-2500 Nl/min; From every grade of vacuum pump all drop into vacuumize constantly to decarburization be the finish time aluminum deoxidation constantly, upcast driving gas flow is controlled at 2500-3400 Nl/min.
5. according to claim 1 or 2 said a kind of control methods that promote RH vacuum cycle decarbonization rate; It is characterized in that the described ladle bottom blowing argon gas of opening; The ratio of ladle bottom blowing argon flow amount and molten steel weight is controlled at 0.1-0.8Nl/ (min t), keeps the fine motion of ladle slag liquid level to be as the criterion.
6. according to claim 1 or 2 said a kind of control methods that promote RH vacuum cycle decarbonization rate, it is characterized in that the purity of said ladle bottom blowing argon gas and driving argon gas is 99.99%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012103002090A CN102816894A (en) | 2012-08-22 | 2012-08-22 | Control method for enhancing RH vacuum circulation decarburization rate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266200A (en) * | 2013-05-15 | 2013-08-28 | 中冶南方工程技术有限公司 | Energy-saving environment-friendly RH (relative humidity) vacuum refining device |
| CN103343183A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Bottom argon blowing accelerated decarburization method for producing IF steel by RH furnace |
| CN109252017A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | Method for preventing RH circulation unevenness of ultra-low carbon high silicon steel |
| CN109576447A (en) * | 2018-12-29 | 2019-04-05 | 钢铁研究总院 | A kind of RH purifier and method promoting the decarburization of molten steel depth |
| CN110982992A (en) * | 2019-12-16 | 2020-04-10 | 首钢集团有限公司 | RH vacuum decarburization method |
| CN111304410A (en) * | 2020-03-24 | 2020-06-19 | 山信软件股份有限公司 | Molten steel refining slag absorption preventing method and system |
| CN113718088A (en) * | 2021-09-06 | 2021-11-30 | 宝钢湛江钢铁有限公司 | 350-ton RH large-cycle rapid decarburization treatment method for automobile sheet |
| CN114645112A (en) * | 2022-03-29 | 2022-06-21 | 广东韶钢松山股份有限公司 | Molten steel vacuum treatment method |
| CN114774635A (en) * | 2022-04-13 | 2022-07-22 | 江苏省沙钢钢铁研究院有限公司 | Decarbonizing smelting method for RH vacuum furnace |
| CN115232922A (en) * | 2022-07-13 | 2022-10-25 | 湖南华菱涟源钢铁有限公司 | RH refining furnace and method for shortening RH treatment period |
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| CN101538641A (en) * | 2009-04-30 | 2009-09-23 | 东北大学 | RH bottom blowing argon vacuum circulating degasser |
| CN102560009A (en) * | 2012-01-16 | 2012-07-11 | 东北大学 | RH vacuum refining bottom blowing powder injection device |
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2012
- 2012-08-22 CN CN2012103002090A patent/CN102816894A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101538641A (en) * | 2009-04-30 | 2009-09-23 | 东北大学 | RH bottom blowing argon vacuum circulating degasser |
| CN102560009A (en) * | 2012-01-16 | 2012-07-11 | 东北大学 | RH vacuum refining bottom blowing powder injection device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266200A (en) * | 2013-05-15 | 2013-08-28 | 中冶南方工程技术有限公司 | Energy-saving environment-friendly RH (relative humidity) vacuum refining device |
| CN103343183A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Bottom argon blowing accelerated decarburization method for producing IF steel by RH furnace |
| CN109252017A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | Method for preventing RH circulation unevenness of ultra-low carbon high silicon steel |
| CN109576447A (en) * | 2018-12-29 | 2019-04-05 | 钢铁研究总院 | A kind of RH purifier and method promoting the decarburization of molten steel depth |
| CN109576447B (en) * | 2018-12-29 | 2024-06-04 | 钢铁研究总院 | RH refining device and method for promoting deep decarburization of molten steel |
| CN110982992A (en) * | 2019-12-16 | 2020-04-10 | 首钢集团有限公司 | RH vacuum decarburization method |
| CN111304410B (en) * | 2020-03-24 | 2021-11-09 | 山信软件股份有限公司 | Molten steel refining slag absorption preventing method and system |
| CN111304410A (en) * | 2020-03-24 | 2020-06-19 | 山信软件股份有限公司 | Molten steel refining slag absorption preventing method and system |
| CN113718088A (en) * | 2021-09-06 | 2021-11-30 | 宝钢湛江钢铁有限公司 | 350-ton RH large-cycle rapid decarburization treatment method for automobile sheet |
| CN114645112A (en) * | 2022-03-29 | 2022-06-21 | 广东韶钢松山股份有限公司 | Molten steel vacuum treatment method |
| CN114645112B (en) * | 2022-03-29 | 2023-03-24 | 广东韶钢松山股份有限公司 | Molten steel vacuum treatment method |
| CN114774635A (en) * | 2022-04-13 | 2022-07-22 | 江苏省沙钢钢铁研究院有限公司 | Decarbonizing smelting method for RH vacuum furnace |
| CN114774635B (en) * | 2022-04-13 | 2023-08-04 | 江苏省沙钢钢铁研究院有限公司 | Decarburization smelting method of RH vacuum furnace |
| CN115232922A (en) * | 2022-07-13 | 2022-10-25 | 湖南华菱涟源钢铁有限公司 | RH refining furnace and method for shortening RH treatment period |
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Application publication date: 20121212 |