CN102441651B - A kind of soaking water gap faying face alters the determination processing method of steel - Google Patents

Abstract

The invention provides a kind of determination processing method that soaking water gap faying face alters steel, situation is stirred according to molten steel liquid level, turn argon flow amount down, if it is not obvious that liquid level stirs change, then by soaking water gap part under wooden stick detection liquid level, if ullage is without obvious crackle, can conclude that soaking water gap and lower mouth of a river faying face exist inspiratory phenomenon.After faying face occurs altering steel, reduction of speed immediately, turns argon flow amount down, and connects a tunger tube, adopts large argon gas amount to cool faying face; Pay close attention to slide plate aperture state, suitably adjustment argon flow amount size; Recover the argon flow amount of filling pipe end, low speed draws steel to watering time end simultaneously.The present invention can find as early as possible and in time process faying face alters steel problem, thus avoids stopping due to what alter that steel causes the accident of watering, and reduces the recuperation of heat of molten steel, cold recovery, reduces causality loss, and that guarantees to produce carries out smoothly.

Description

A kind of soaking water gap faying face alters the determination processing method of steel

Technical field

The invention belongs to continuous casting process field, particularly in a kind of casting process there is the emergent determination processing method of altering steel in soaking water gap and lower mouth of a river faying face.

Background technology

If the faying face out-of-flatness at soaking water gap and the lower mouth of a river or mouth of a river pad is aging, air-dry crackle etc., capital causes mouth of a river faying face to alter steel, once alter steel and don't take proper measure to be saved in time, will make to alter steel place to expand, cause and be forced to stop the accident of watering, thus cause cold recovery, the recuperation of heat of molten steel, not only cause billet yield to decline and increase molten steel after-treatment amount, have a strong impact on carrying out smoothly of production, directly increase production cost, and certain impact will be brought on slab quality, cause great economic loss to enterprise.

Summary of the invention

The present invention aims to provide one and can find as early as possible to alter steel sign and process in time to alter steel accident, and avoid accident to stop watering, the soaking water gap faying face reducing the cold recovery of molten steel and heat recovery rate alters the processing method of steel.

For this reason, the technical solution that the present invention takes is:

Soaking water gap faying face alters a determination processing method for steel, it is characterized in that:

(1), mouth of a river faying face alters the judgement before steel:

Alter steel front mouth of a river faying face and there will be inspiratory phenomenon, along with faying face air-breathing, molten steel contacts with the oxygen in air, and the molten steel liquid level of air-breathing side digs more than 10mm, and after argon gas closedown, it is little that liquid level stirs degree change; By soaking water gap part under wooden stick detection liquid level, whether have obvious crackle, as without obvious crackle or leakage eye, then can conclude that soaking water gap and lower mouth of a river faying face exist inspiratory phenomenon if observing ullage simultaneously;

(2), mouth of a river faying face alters the process of steel:

If soaking water gap and lower mouth of a river faying face occur altering steel, steel speed will be drawn immediately to be down to 0.8-1.0m/min, the argon flow amount of filling pipe end and slide plate will be controlled to 10m ³/ h, reduces the molten steel flow of mouth of a river passage, and rapidly connecting a tunger tube on the lower mouth of a river of altering steel place, argon flow amount is controlled to 30 ~ 40m ³/ h cools faying face, makes faying face form cold steel fast; Until liquid level stabilizing, alter steel and stop and after stablizing 10 ~ 15min, argon gas be adjusted to 10 ~ 20m ³/ h, prevents nozzle clogging; Pay close attention to and according to the aperture state of slide plate, suitably adjust argon flow amount; Meanwhile, the argon flow amount of filling pipe end is recovered to 30 ~ 40m ³/ h, ensures the melting state of covering slag; Take 0.8 ~ 1.0m/min low speed to draw steel, prevent excessive steel stream from washing away the cold steel solidified, until water time end.

Beneficial effect of the present invention is:

One aspect of the present invention can find that the hidden danger of steel appears altering in soaking water gap faying face as early as possible, to take measures in time to be controlled; Simultaneously once after occurring altering steel accident, also effectively can carry out emergent remedying, Accident prevention expands, thus avoids stopping due to what alter that steel causes the accident of watering, and reduces the recuperation of heat of molten steel, cold recovery, reduces causality loss, and that guarantees to produce carries out smoothly.The inventive method is simple, convenient operation, and can improve cast effect to a certain extent, improves faying face and alters the impact of steel on slab quality.

Detailed description of the invention

Embodiment 1:

Soaking water gap faying face alters the judgement before steel:

Mouth of a river faying face has certain sign before altering steel, namely alter steel front mouth of a river faying face and there will be inspiratory phenomenon, and along with faying face air-breathing, molten steel contacts with the oxygen in air, will speed up the etch to soaking water gap faying face, if taken measures not in time, that will cause mouth of a river faying face alters steel accident.The main feature of faying face air-breathing is, after air-breathing appears in faying face, the molten steel liquid level of air-breathing side just there will be larger stirring.Namely molten steel liquid level is dug and can be reached more than 10mm.For determining faying face whether air-breathing, its measure, after being closed by argon gas, observes liquid level and stir situation, if liquid level still stirs comparatively large, illustrate the size of argon flow amount to liquid level to stir influential effect little.Now again by soaking water gap part under wooden stick detection liquid level, observe ullage and divide whether have obvious crackle or leakage eye, as without obvious crackle or leak eye, then can judge that soaking water gap and lower mouth of a river faying face exist inspiratory phenomenon, just should take measures in time to be controlled, also can process according to the way of altering steel.

There is the process after altering steel in soaking water gap faying face:

If soaking water gap and lower mouth of a river faying face occur altering steel, steel speed will be drawn immediately to be down to 0.9m/min, the argon flow amount of filling pipe end and slide plate will be controlled to 10m ³/ h, reduces the molten steel flow of mouth of a river passage, and rapidly connecting a tunger tube on the lower mouth of a river of altering steel place, argon flow amount is controlled to 40m ³/ h, adopts argon gas cooling faying face, makes faying face form cold steel fast.Until liquid level stabilizing, alter after steel stops, then stablize 14min, then turn argon flow amount down in time, argon gas is adjusted to 15m ³/ h, prevents that the intensity of cooling of argon gas is excessive causes nozzle clogging, affects casting condition.Meanwhile, the aperture situation of slide plate should be paid close attention to the moment, and the argon flow amount of filling pipe end is returned to 34m ³/ h, guarantees the melting state of covering slag.In the process, the low speed of 0.8m/min should be taked all the time to draw steel, even if after in stable condition, also can not improve pulling rate, to prevent steel from flowing through greatly, wash away the cold steel solidified, cause faying face again to alter steel.Reduction of speed draws steel until originally water time end, then processes faying face, avoids again altering steel.

Embodiment 2:

Soaking water gap faying face alters the judgement before steel:

Alter steel front mouth of a river faying face and there will be inspiratory phenomenon, and along with faying face air-breathing, molten steel contacts with the oxygen in air, will speed up the etch to soaking water gap faying face, if taken measures not in time, that will cause mouth of a river faying face alters steel accident.After air-breathing appears in faying face, the molten steel liquid level of air-breathing side just there will be larger stirring.Namely molten steel liquid level is dug and can be reached more than 10mm.And after argon gas closes, if liquid level still stirs comparatively large, illustrate the size of argon flow amount to liquid level to stir influential effect little.Now again by soaking water gap part under wooden stick detection liquid level, observe ullage and divide whether have obvious crackle or leakage eye, as without obvious crackle or leak eye, then can judge that soaking water gap and lower mouth of a river faying face exist inspiratory phenomenon, just should take measures in time to be controlled, also can process according to the way of altering steel.

There is the process after altering steel in soaking water gap faying face:

If soaking water gap and lower mouth of a river faying face occur altering steel, steel speed will be drawn immediately to be down to 1.0m/min, the argon flow amount of filling pipe end and slide plate will be controlled to 10m ³/ h, reduces the molten steel flow of mouth of a river passage, and rapidly connecting a tunger tube on the lower mouth of a river of altering steel place, argon flow amount is controlled to 30m ³/ h, adopts argon gas cooling faying face, makes faying face form cold steel fast.Until liquid level stabilizing, alter after steel stops, then stablize 10min, then turn argon flow amount down in time, argon gas is adjusted to 20m ³/ h, prevents that the intensity of cooling of argon gas is excessive causes nozzle clogging, affects casting condition.Meanwhile, the aperture situation of slide plate should be paid close attention to the moment, and the argon flow amount of filling pipe end is returned to 40m ³/ h, guarantees the melting state of covering slag.In the process, the low speed of 1.0m/min should be taked all the time to draw steel, even if after in stable condition, also can not improve pulling rate, to prevent steel from flowing through greatly, wash away the cold steel solidified, cause faying face again to alter steel.Reduction of speed draws steel until originally water time end, then processes faying face, avoids again altering steel.

Claims (1)

1. soaking water gap faying face alters a determination processing method for steel, it is characterized in that:

(1), mouth of a river faying face alters the judgement before steel:

Before altering steel, soaking water gap and lower mouth of a river faying face there will be inspiratory phenomenon, and along with faying face air-breathing, molten steel contacts with the oxygen in air, and the molten steel liquid level of air-breathing side digs more than 10mm, and after argon gas closedown, it is little that liquid level stirs degree change; By soaking water gap part under wooden stick detection liquid level, whether have obvious crackle, as without obvious crackle or leakage eye, then can conclude that soaking water gap and lower mouth of a river faying face exist inspiratory phenomenon if observing ullage simultaneously;

(2), mouth of a river faying face alters the process of steel:

If soaking water gap and lower mouth of a river faying face occur altering steel, steel speed will be drawn immediately to be down to 0.8-1.0m/min, the argon flow amount of filling pipe end and slide plate will be controlled to 10m ³/ h, reduces the molten steel flow of mouth of a river passage, and rapidly connecting a tunger tube on the lower mouth of a river of altering steel place, argon flow amount is controlled to 30 ~ 40m ³/ h cools faying face, makes faying face form cold steel fast; Until liquid level stabilizing, alter steel and stop and after stablizing 10 ~ 15min, argon gas be adjusted to 10 ~ 20m ³/ h, prevents nozzle clogging; Pay close attention to and according to the aperture state of slide plate, suitably adjust argon flow amount; Meanwhile, the argon flow amount of filling pipe end is recovered to 30 ~ 40m ³/ h, ensures the melting state of covering slag; Take 0.8 ~ 1.0m/min low speed to draw steel, prevent excessive steel stream from washing away the cold steel solidified, until water time end.