CN102941323A - Method for quickly replacing tundish at low liquid level of medium thin plate blank continuous casting machine crystallizer - Google Patents
Method for quickly replacing tundish at low liquid level of medium thin plate blank continuous casting machine crystallizer Download PDFInfo
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- CN102941323A CN102941323A CN201210534436XA CN201210534436A CN102941323A CN 102941323 A CN102941323 A CN 102941323A CN 201210534436X A CN201210534436X A CN 201210534436XA CN 201210534436 A CN201210534436 A CN 201210534436A CN 102941323 A CN102941323 A CN 102941323A
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- tundish
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Abstract
The invention provides a method for quickly replacing a tundish at a low liquid level of a medium thin plate blank continuous casting machine crystallizer. The method comprises the following steps of: (1) reducing the tonnage of liquid steel in an old tundish to 20 tons and reducing the pull speed at the same time; (2) reducing the tonnage of the old tundish to 8 to 10 tons, switching a crystallizer liquid level control mode from an automatic control mode into a manual control mode, and closing a plug stick; (3) rising the old tundish to a high-level removal pouring position, and starting a new tundish to move to the pouring position; (4) pulling the liquid level in the crystallizer to a position 550mm away from the upper edge of a copper plate of the crystallizer, and stopping pulling and straightening; (5) moving the new tundish to the pouring position; (6) pouring until the tonnage of the tundish is 4 tons, performing high-flow pouring, adding protection slag, and performing pulling and straightening; (7) increasing the pull speed to 1.30 m/min, and changing the manual control mode into the automatic control mode; and (8) increasing the pull speed to a target pouring speed, thus finishing the replacement of the tundish.
Description
Technical field
The invention belongs to field of steel-making, be specifically related to the low liquid level quick-replaceable Tundish Technology of a kind of medium and thin slab continuous caster crystallizer.
Background technology
In the continuous casting production process, in order realizing improving the conticaster operating rate by improving continuous pouring stove number, usually all to adopt crystallizer at high liquid level quick-replaceable tundish technique, to pull the bleed-out accident to avoid that the lapping defect position occurs.Because of medium and thin slab continuous caster mould wall thickness size generally in 80mm～150mm scope, and than slab CC machine machine mould wall thickness 〉=200mm, be the medium and thin slab continuous caster mould wall thickness less than than slab CC machine machine mould wall thickness, when adopting high liquid level quick-replaceable tundish technique, submersed nozzle inserts in the molten steel in mold process, be trapped in that base shell that the molten steel in the crystallizer forms easily bumps with it or can't insert because of the contraction of base shell, cause changing and wrap unsuccessfully, the success rate of changing tundish is low.
Summary of the invention
The invention provides the method for the low liquid level quick-replaceable tundish of a kind of medium and thin slab continuous caster crystallizer, realize medium and thin slab continuous caster quick-replaceable tundish by the low liquid level of crystallizer, purpose is to avoid submersed nozzle and the base shell that is trapped in the crystallizer to bump, and improves quick-replaceable tundish success rate.
This programme is achieved by the following technical measures: the method in the middle of the low liquid level quick-replaceable of medium and thin slab continuous caster crystallizer realizes by following steps:
(1) molten steel tonnage in the old tundish is reduced to 20 tons, stops after being reduced to 20 tons and rise new baking of tundish device, carry out new tundish inspection, fall simultaneously the conticaster pulling rate;
(2) old tundish tonnage is reduced to 8～10 tons, pulling rate is down to about 1.20m/min; When old tundish tonnage was 7～9t, pulling rate was down to 0.80 m/min, and the logic approach for mold level control mode is switched to manual control model by automatic control mode, and the mouth of a river is risen near the molten steel face; After 60 seconds, pulling rate is down to 0.40m/min fast, closes stopper, and squeeze into blind plate and stop watering;
(3) stop watering rear old tundish car " pre-thermal potential " button of pressing rapidly, old tundish is risen to a high position shift out pouring position, start simultaneously new tundish car and open to pouring position;
(4) liquid level in the crystallizer is pulled on the copper plate of crystallizer along the 550mm place, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom, the intrusive mood mouth of a river to apart from molten steel in mold liquid level 50mm place, ladle begins cast, opens to water the pulling rate of starting to walk and be set as 0.70m/min;
(6) be poured into the tundish tonnage and reach 4 tons, open stopper, carry out large flow cast, be poured into the molten steel in mold liquid level and be higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start simultaneously straightening, the starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00 m/min, with the speed that increased 0.10m/min in per 30 seconds pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by manual control model;
(8) with the speed that increased 0.2m/min in per 60 seconds pulling rate is risen to the target poring rate, finish the replacing of tundish.
By above-mentioned technical characterictic gram as can be known, this programme owing to can realize low liquid level quick-replaceable tundish, thereby avoided the production accident of the replacing tundish failure that causes because of the collision of base shell in the crystallizer and the intrusive mood mouth of a river, improved the success rate of changing tundish.
The specific embodiment
For clearly demonstrating the technical characterstic of this programme, below by a specific embodiment, this programme is set forth.
In this embodiment, 32 tons of tundish nominal capacities, crystallizer section thickness size 135mm, length of mould 1100mm, conticaster target pulling rate 2.00m/min, during the low liquid level quick-replaceable tundish of crystallizer, along 550mm, and actual liquid level is 550mm to the molten steel identity distance in this moment crystallizer on the copper plate of crystallizer.The implementation step is as follows:
(1) molten steel tonnage in the old tundish is reduced to 20 tons, stops after being reduced to 20 tons and rise new baking of tundish device, carry out new tundish inspection, fall simultaneously the conticaster pulling rate;
(2) old tundish tonnage is reduced to 8～10 tons, pulling rate is down to about 1.20m/min; When old tundish tonnage was 7～9t, pulling rate was down to 0.80 m/min, and the logic approach for mold level control mode is switched to manual control model by automatic control mode, and the mouth of a river is risen near the molten steel face; After 60 seconds, pulling rate is down to 0.40m/min fast, closes stopper, and squeeze into blind plate and stop watering;
(3) stop watering rear old tundish car " pre-thermal potential " button of pressing rapidly, old tundish is risen to a high position shift out pouring position, start simultaneously new tundish car and open to pouring position;
(4) liquid level in the crystallizer is pulled on the copper plate of crystallizer along the 550mm place, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom, the intrusive mood mouth of a river to apart from molten steel in mold liquid level 50mm place, ladle begins cast, opens to water the pulling rate of starting to walk and be set as 0.70m/min;
(6) be poured into the tundish tonnage and reach 4 tons, open stopper, carry out large flow cast, to increase molten steel to the impulsive force of strand base head in the crystallizer and to improve the dovetail connector safety coefficient; Be poured into the molten steel in mold liquid level and be higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start simultaneously straightening, the starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00 m/min, with the speed that increased 0.10m/min in per 30 seconds pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by manual control model;
(8) with the speed that increased 0.2m/min in per 60 seconds pulling rate is risen to the target poring rate, finish the replacing of tundish.
Changing bag rhythm is controlled by the continuous casting captain.Change to be mainly before the bag and fall the pulling rate operation, adopt that to fall the pulling rate amplitude early stage as far as possible little, change the bag time with saving, prevent that the molten steel in mold temperature drop is too large.Change to be mainly behind the bag and rise the pulling rate operation, amplitude is determined by liquid steel temperature in the tundish, adopts slow raising speed when temperature is high, and temperature adopts fast raising speed when low.Leave new centre and unwrap the time of watering and be controlled in the 3min from starting old tundish.
The present invention can pass through existing techniques in realizing without the technical characterictic of describing, and does not repeat them here.Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (1)
1. the method for the low liquid level quick-replaceable tundish of a medium and thin slab continuous caster crystallizer, it is characterized in that: the method in the middle of the low liquid level quick-replaceable of described medium and thin slab continuous caster crystallizer realizes by following steps:
(1) molten steel tonnage in the old tundish is reduced to 20 tons, stops after being reduced to 20 tons and rise new baking of tundish device, carry out new tundish inspection, fall simultaneously the conticaster pulling rate;
(2) old tundish tonnage is reduced to 8～10 tons, pulling rate is down to about 1.20m/min; When old tundish tonnage was 7～9t, pulling rate was down to 0.80 m/min, and the logic approach for mold level control mode is switched to manual control model by automatic control mode, and the mouth of a river is risen near the molten steel face; After 60 seconds, pulling rate is down to 0.40m/min fast, closes stopper, and squeeze into blind plate and stop watering;
(3) stop watering rear old tundish car " pre-thermal potential " button of pressing rapidly, old tundish is risen to a high position shift out pouring position, start simultaneously new tundish car and open to pouring position;
(4) liquid level in the crystallizer is pulled on the copper plate of crystallizer along the 550mm place, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom, the intrusive mood mouth of a river to apart from molten steel in mold liquid level 50mm place, ladle begins cast, opens to water the pulling rate of starting to walk and be set as 0.70m/min;
(6) be poured into the tundish tonnage and reach 4 tons, open stopper, carry out large flow cast, be poured into the molten steel in mold liquid level and be higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start simultaneously straightening, the starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00 m/min, with the speed that increased 0.10m/min in per 30 seconds pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by manual control model;
(8) with the speed that increased 0.2m/min in per 60 seconds pulling rate is risen to the target poring rate, finish the replacing of tundish.
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| CN201210534436.XA CN102941323B (en) | 2012-12-12 | 2012-12-12 | The low liquid level of medium and thin slab continuous caster crystallizer changes the method for changing tundish fast |
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| CN201210534436.XA CN102941323B (en) | 2012-12-12 | 2012-12-12 | The low liquid level of medium and thin slab continuous caster crystallizer changes the method for changing tundish fast |
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| CN102941323B CN102941323B (en) | 2016-01-20 |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying 460MPa-level thick plate and manufacturing method thereof |
| CN103586435A (en) * | 2013-11-12 | 2014-02-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pouring through stainless steel replaceable tundishes |
| CN104646641A (en) * | 2015-03-16 | 2015-05-27 | 攀钢集团攀枝花钢钒有限公司 | Pulling rate reduction control method and tundish changing control method in continuous casting system |
| CN103464699B (en) * | 2013-08-13 | 2016-01-20 | 新疆八一钢铁股份有限公司 | A kind of method improving continuous casting tundish heat exchange success rate |
| CN105983671A (en) * | 2015-02-25 | 2016-10-05 | 鞍钢股份有限公司 | Method for increasing success rate of continuous casting and continuous pouring |
| CN106216622A (en) * | 2016-08-29 | 2016-12-14 | 山东钢铁股份有限公司 | A kind of method of quick-replaceable tundish in molten steel casting process |
| CN108817341A (en) * | 2018-07-18 | 2018-11-16 | 中天钢铁集团有限公司 | Conticaster reduces the method that pulling rate improves quick change success rate |
| CN109175343A (en) * | 2018-07-09 | 2019-01-11 | 新兴铸管股份有限公司 | A kind of continuous casting production protection technique |
| CN109894587A (en) * | 2019-04-03 | 2019-06-18 | 南京钢铁股份有限公司 | A kind of generous specification slab CC tundish docking production technology |
| CN110640107A (en) * | 2019-10-17 | 2020-01-03 | 山东钢铁集团日照有限公司 | Method for preventing blank shell from shrinking during quick changing of tundish of continuous casting machine |
| CN110653349A (en) * | 2019-07-31 | 2020-01-07 | 广东韶钢松山股份有限公司 | One-key type quick ladle connecting device for tundish of continuous casting machine and using method |
| CN112191837A (en) * | 2020-10-12 | 2021-01-08 | 马鞍山钢铁股份有限公司 | Control method for slab continuous casting silicon steel quick-change tundish process |
| CN112222368A (en) * | 2020-09-11 | 2021-01-15 | 南京钢铁股份有限公司 | Method for operating butt joint and speed increasing of tundish in continuous casting of ultra-thick plate blank |
| CN112247133A (en) * | 2020-10-22 | 2021-01-22 | 广东韶钢松山股份有限公司 | Tundish quick-change connector, use method thereof and casting-stopping ladle-changing casting-starting process |
| CN112643006A (en) * | 2020-12-09 | 2021-04-13 | 北京首钢自动化信息技术有限公司 | Method, device, equipment and medium for controlling quick change of tundish |
| CN113210577A (en) * | 2021-05-14 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Method for improving success rate of changing middle ladle of wide section of plate blank and manufacturing method thereof |
| CN114406223A (en) * | 2022-01-29 | 2022-04-29 | 新疆八一钢铁股份有限公司 | Method for replacing tundish of iron and steel enterprise without shutdown in continuous casting |
| CN114682752A (en) * | 2022-04-06 | 2022-07-01 | 安阳钢铁股份有限公司 | Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine |
| CN115213366A (en) * | 2022-07-22 | 2022-10-21 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade of large-section continuous casting production line |
| CN115401193A (en) * | 2022-09-28 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for hot exchanging tundish in billet continuous casting machine |
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| CN103361552A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | V-N microalloying 460MPa-level thick plate and manufacturing method thereof |
| CN103464699B (en) * | 2013-08-13 | 2016-01-20 | 新疆八一钢铁股份有限公司 | A kind of method improving continuous casting tundish heat exchange success rate |
| CN103586435A (en) * | 2013-11-12 | 2014-02-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pouring through stainless steel replaceable tundishes |
| CN103586435B (en) * | 2013-11-12 | 2015-11-25 | 山西太钢不锈钢股份有限公司 | A kind of stainless steel changes the method that middle Bao Lian waters |
| CN105983671A (en) * | 2015-02-25 | 2016-10-05 | 鞍钢股份有限公司 | Method for increasing success rate of continuous casting and continuous pouring |
| CN104646641A (en) * | 2015-03-16 | 2015-05-27 | 攀钢集团攀枝花钢钒有限公司 | Pulling rate reduction control method and tundish changing control method in continuous casting system |
| CN106216622A (en) * | 2016-08-29 | 2016-12-14 | 山东钢铁股份有限公司 | A kind of method of quick-replaceable tundish in molten steel casting process |
| CN109175343A (en) * | 2018-07-09 | 2019-01-11 | 新兴铸管股份有限公司 | A kind of continuous casting production protection technique |
| CN108817341A (en) * | 2018-07-18 | 2018-11-16 | 中天钢铁集团有限公司 | Conticaster reduces the method that pulling rate improves quick change success rate |
| CN109894587A (en) * | 2019-04-03 | 2019-06-18 | 南京钢铁股份有限公司 | A kind of generous specification slab CC tundish docking production technology |
| CN110653349A (en) * | 2019-07-31 | 2020-01-07 | 广东韶钢松山股份有限公司 | One-key type quick ladle connecting device for tundish of continuous casting machine and using method |
| CN110640107A (en) * | 2019-10-17 | 2020-01-03 | 山东钢铁集团日照有限公司 | Method for preventing blank shell from shrinking during quick changing of tundish of continuous casting machine |
| CN110640107B (en) * | 2019-10-17 | 2021-06-01 | 山东钢铁集团日照有限公司 | Method for preventing blank shell from shrinking during quick changing of tundish of continuous casting machine |
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| CN112191837B (en) * | 2020-10-12 | 2022-06-17 | 马鞍山钢铁股份有限公司 | Control method for slab continuous casting silicon steel quick-change tundish process |
| CN112247133A (en) * | 2020-10-22 | 2021-01-22 | 广东韶钢松山股份有限公司 | Tundish quick-change connector, use method thereof and casting-stopping ladle-changing casting-starting process |
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| CN114406223A (en) * | 2022-01-29 | 2022-04-29 | 新疆八一钢铁股份有限公司 | Method for replacing tundish of iron and steel enterprise without shutdown in continuous casting |
| CN114682752A (en) * | 2022-04-06 | 2022-07-01 | 安阳钢铁股份有限公司 | Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine |
| CN115213366A (en) * | 2022-07-22 | 2022-10-21 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade of large-section continuous casting production line |
| CN115213366B (en) * | 2022-07-22 | 2024-03-01 | 山东钢铁股份有限公司 | Method for quickly replacing steel grade in large-section continuous casting production line |
| CN115401193A (en) * | 2022-09-28 | 2022-11-29 | 山东莱钢永锋钢铁有限公司 | Method for hot exchanging tundish in billet continuous casting machine |
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Granted publication date: 20160120 Termination date: 20181212 |