CN102941323B - The low liquid level of medium and thin slab continuous caster crystallizer changes the method for changing tundish fast - Google Patents
The low liquid level of medium and thin slab continuous caster crystallizer changes the method for changing tundish fast Download PDFInfo
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- CN102941323B CN102941323B CN201210534436.XA CN201210534436A CN102941323B CN 102941323 B CN102941323 B CN 102941323B CN 201210534436 A CN201210534436 A CN 201210534436A CN 102941323 B CN102941323 B CN 102941323B
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Abstract
The invention provides the method for a kind of medium and thin slab continuous caster crystallizer low liquid level quick-replaceable tundish, step is as follows: molten steel tonnage in old tundish is reduced to 20 tons by (1), falls pulling rate simultaneously; (2) old tundish tonnage is reduced to 8 ~ 10 tons, logic approach for mold level control mode is switched to MANUAL CONTROL mode by automatic control mode, close stopper; (3) old tundish is risen to a high position and shift out pouring position, start new tundish car simultaneously and open to pouring position; (4) liquid level in crystallizer is pulled to along 550mm place on copper plate of crystallizer, stops straightening; (5) new tundish is moved to pouring position; (6) be poured into tundish tonnage and reach 4 tons, carry out large discharge cast, add covering slag subsequently, and start straightening simultaneously; (7) pulling rate is risen to 1.30m/min, and change MANUAL CONTROL mode into automatic control mode; (8) pulling rate is risen to target poring rate by speed, complete the replacing of tundish.
Description
Technical field
The invention belongs to field of steel-making, be specifically related to a kind of medium and thin slab continuous caster crystallizer low liquid level quick-replaceable Tundish Technology.
Background technology
In continuous casting production process, in order to realize improving conticaster operating rate by improving continuous pouring stove number, usually all adopt crystallizer at high liquid level quick-replaceable tundish technique, pull bleed-out accident to avoid that lapping defect position occurs.Because medium and thin slab continuous caster mould wall thickness size is generally within the scope of 80mm ~ 150mm, and comparatively Plate production mould wall thickness >=200mm, namely medium and thin slab continuous caster mould wall thickness is less than comparatively Plate production mould wall thickness, when adopting high liquid level quick-replaceable tundish technique, submersed nozzle inserts in molten steel in mold process, the base shell being trapped in the molten steel formation in crystallizer easily collides with it or cannot insert because base shell shrinks, cause changing and wrap unsuccessfully, the success rate changing tundish is low.
Summary of the invention
The invention provides the method for a kind of medium and thin slab continuous caster crystallizer low liquid level quick-replaceable tundish, medium and thin slab continuous caster quick-replaceable tundish is realized by the low liquid level of crystallizer, object avoids submersed nozzle and the base shell be trapped in crystallizer to collide, 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 is realized by following steps:
(1) molten steel tonnage in old tundish is reduced to 20 tons, stops after being reduced to 20 tons and rise new baking of tundish device, carrying out new tundish inspection, fall conticaster pulling rate simultaneously;
(2) old tundish tonnage is reduced to 8 ~ 10 tons, pulling rate is down to about 1.20m/min; When old tundish tonnage is 7 ~ 9t, pulling rate is down to 0.80m/min, and logic approach for mold level control mode is switched to MANUAL CONTROL mode by automatic control mode, is risen at the mouth of a river near 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 and press rapidly old tundish car " pre-thermal potential " button afterwards, old tundish is risen to a high position and shifts out pouring position, start new tundish car simultaneously and open to pouring position;
(4) liquid level in crystallizer is pulled to along 550mm place on copper plate of crystallizer, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom the intrusive mood mouth of a river to distance molten steel in mold liquid level 50mm place, ladle start cast, open water start to walk pulling rate be set as 0.70m/min;
(6) be poured into tundish tonnage and reach 4 tons, open stopper, carry out large discharge cast, be poured into molten steel in mold liquid level higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start straightening simultaneously, starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00m/min, with the speed increasing 0.10m/min for every 30 seconds, pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by MANUAL CONTROL mode;
(8) with the speed increasing 0.2m/min for every 60 seconds, pulling rate is risen to target poring rate, complete the replacing of tundish.
From above-mentioned technical characteristic gram, this programme due to low liquid level quick-replaceable tundish can be realized, thus avoid because the production accident of the replacing tundish failure caused is collided at base shell in crystallizer and the intrusive mood mouth of a river, improve the success rate changing tundish.
Detailed description of the invention
For the technical characterstic of this programme can be clearly demonstrated, below by a detailed description of the invention, this programme is set forth.
In this embodiment, tundish nominal capacity 32 tons, crystallizer section thickness size 135mm, length of mould 1100mm, conticaster target pull rate 2.00m/min, during crystallizer low liquid level quick-replaceable tundish, molten steel identity distance on copper plate of crystallizer along 550mm, and now in crystallizer actual liquid level be 550mm.Concrete implementation step is as follows:
(1) molten steel tonnage in old tundish is reduced to 20 tons, stops after being reduced to 20 tons and rise new baking of tundish device, carrying out new tundish inspection, fall conticaster pulling rate simultaneously;
(2) old tundish tonnage is reduced to 8 ~ 10 tons, pulling rate is down to about 1.20m/min; When old tundish tonnage is 7 ~ 9t, pulling rate is down to 0.80m/min, and logic approach for mold level control mode is switched to MANUAL CONTROL mode by automatic control mode, is risen at the mouth of a river near 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 and press rapidly old tundish car " pre-thermal potential " button afterwards, old tundish is risen to a high position and shifts out pouring position, start new tundish car simultaneously and open to pouring position;
(4) liquid level in crystallizer is pulled to along 550mm place on copper plate of crystallizer, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom the intrusive mood mouth of a river to distance molten steel in mold liquid level 50mm place, ladle start cast, open water start to walk pulling rate be set as 0.70m/min;
(6) be poured into tundish tonnage and reach 4 tons, open stopper, carry out large discharge cast, to increase molten steel to the impulsive force of strand base head in crystallizer and raising dovetail connector safety coefficient; Be poured into molten steel in mold liquid level higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start straightening simultaneously, starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00m/min, with the speed increasing 0.10m/min for every 30 seconds, pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by MANUAL CONTROL mode;
(8) with the speed increasing 0.2m/min for every 60 seconds, pulling rate is risen to target poring rate, complete the replacing of tundish.
Change bag rhythm to be controlled by continuous casting captain.Be mainly before changing bag and fall pulling rate operation, adopt fall pulling rate amplitude early stage as far as possible little, change the bag time to save, prevent molten steel in mold temperature drop too large.Be mainly after changing bag and rise pulling rate operation, amplitude is determined by liquid steel temperature in tundish, adopts slow raising speed, adopt fast raising speed when temperature is low during temperature height.Output new tundish casting time from the old tundish of startup to control within 3min.
The present invention can pass through existing techniques in realizing without the technical characteristic described, and does not repeat them here.Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change 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. a method for medium and thin slab continuous caster crystallizer low liquid level quick-replaceable tundish, is characterized in that: the method for described medium and thin slab continuous caster crystallizer low liquid level quick-replaceable tundish is realized by following steps:
(1) by after molten steel tonnage is reduced to 20 tons in old tundish, stop and rising new baking of tundish device, carrying out new tundish inspection, fall conticaster pulling rate simultaneously;
(2) old tundish tonnage is reduced to 10 tons, pulling rate is down to 1.20m/min; When old tundish tonnage is 7t, pulling rate is down to 0.80m/min, and logic approach for mold level control mode is switched to MANUAL CONTROL mode by automatic control mode, is risen at the mouth of a river near 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 and press rapidly old tundish car " pre-thermal potential " button afterwards, old tundish is risen to a high position and shifts out pouring position, start new tundish car simultaneously and open to pouring position;
(4) liquid level in crystallizer is pulled to along 550mm place on copper plate of crystallizer, stops straightening;
(5) new tundish is moved to pouring position, and adjust bottom the intrusive mood mouth of a river to distance molten steel in mold liquid level 50mm place, ladle start cast, open water start to walk pulling rate be set as 0.70m/min;
(6) be poured into tundish tonnage and reach 4 tons, open stopper, carry out large discharge cast, be poured into molten steel in mold liquid level higher than edge on the gaging hole of the intrusive mood mouth of a river, add covering slag, and start straightening simultaneously, starting pulling rate is 0.70m/min;
(7) start straightening after 30 seconds, pulling rate is risen to 1.00m/min, with the speed increasing 0.10m/min for every 30 seconds, pulling rate is risen to 1.30m/min subsequently, and change mold liquid level into automatic control mode by MANUAL CONTROL mode;
(8) with the speed increasing 0.2m/min for every 60 seconds, pulling rate is risen to target poring rate, complete 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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| 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 |
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| 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 |
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